Search Results: "ana"

31 August 2026

Jonathan McDowell: What do I want in a Linux distribution?

I ve been a Debian user since 1999, and a Debian developer since 2000. Given recent events it s worth thinking about why that that is, and why I haven t switched to something else in the past quarter century. My first Linux distro was Slackware, off a CD in a book, some time in the mid 90s. After starting university I ran SUSE for a while, then moved to RedHat (both back before they had commercial variants significantly different to what was available freely). The main motivation for switching was package management; I was running a machine at home, and a machine at university. Keeping track of what was installed on each, and what versions, was getting annoying with Slackware. Most of the folk I knew were running RedHat, and I mostly played with SUSE because I m contrary before realising it was different enough that I couldn t easily make use of 3rd party RPMs. I came to Debian via friends in Cambridge, who spoke highly of it. The first Debian machine I installed was fourier, the initial host for Black Cat Networks, and I never looked back. (For additional context I should also point out I have contributed, in the distant past, to, and run, OpenWRT, OpenEmbedded, and FreeBSD.) I d like to try and work out what is it I get from Debian that I d need in anything else. Originally I tried to order the requirements in some sort of priority, but it s sometimes hard to work out what I d drop if I had to compromise somewhere, so it s a somewhat loose ordering.
Stable releases, with security support
I run Linux in lots of places, from remote servers/VMs, to my house router, to my desktop/laptop. Some of those I don t want to be updating regularly with new software releases, I need something I can be sure is going to keep working, but will get necessary security + critical updates. A rolling distro that provides security via the latest upstream release doesn t provide that guarantee. Equally there need to be regular stable releases, or things become too stale. (The one time I considered moving away from Debian was during the 3 year Sarge / 3.1 release cycle. I think if things hadn t improved I d have jumped ship to Ubuntu at the time.)
A good selection of packages
One of the reasons I moved from RedHat to Debian was the wide range of packages available as part of the standard OS. Pulling it all into the distro helps with quality control, compared to random 3rd party packages. A centralised bug system and repository is a win too. Perhaps packages at all is something I should list, but I take it as a given if you re running a distro. I need to know what I have installed on my machine, what version that software is, what files it owns, and what it depends on.
Free Software
This is important to me. I ll make pragmatic compromises about software I run on my systems if it makes sense, but I want to start from a place that does not require anything non-free. I ve run a company on Debian, and I ve worked on numerous products that ran it under the hood. The DFSG give me confidence I can do that.
Smooth upgrades
Debian s ability to upgrade a system smoothly is one of the reasons I first moved to it. The first upgrade I did was remotely on a machine sitting on a 2Mb/s leased line. I was nervous doing the reboot at the end, but it came back fine. At the time the equivalent procedure with RedHat involved rebooting into the OS installer to do the upgrade.
I know things have moved on since then, and really it should all be scripted, and machines should be cattle not pets, but for personal use I run a small enough number of machines that having the upgrade path between releases is a must have.
Community
The original pull of the Debian community was the knowledge I could get involved, and upload packages that were missing that I was using. That s how I first got involved, uploading things Black Cat used, which made life easier for us in the long run. I don t have time to maintain all the software I use myself, and I don t want to be beholden to a commercial entity to do so for me, so a distribution that allows me to help out where I can as part of the community seems to me to be the right way to do things.
Architecture support
Perhaps less important, especially when I started using Debian, but these days I have amd64, arm64, armhf, and riscv machines. Everything except for the risvc box is doing something useful, and would need replaced if I couldn t keep running it, and I expect RISC-V to transition into that state in the next few years as the hardware improves.
Binary packages
I ran a FreeBSD desktop for some time. It might have been the way I was holding it, but binary package installs were generally not something reliable, especially after the initial install, and I ended up building things from ports from source quite often. That worked incredibly well (I used to think people who raved about Gentoo really should just go do it properly and use FreeBSD), but I don t want to spend time compiling things, especially on some of my machines (my router should not need a compiler, for example).
Ultimately I don t want to have to actively think about the Linux distribution I use. Debian has mostly given me that; I know it will generally be suitable for most environments I want to use it in (embedded situations where OpenWRT or OpenEmbedded are better choices being the exception, but that s less frequent these days), and I can rely on getting timely security updates (thanks to all those who work on that within Debian!). I m not sure there s currently an alternative that would suit my needs? I d love to hear if there s something I should look at, even if I m not necessary making a move just yet!

Russ Allbery: Review: The Hands of the Emperor

Review: The Hands of the Emperor, by Victoria Goddard
Series: Lays of the Hearth-Fire #1
Publisher: Underhill Books
Copyright: January 2019
ISBN: 1-988908-15-9
Format: Kindle
Pages: 739
The Hands of the Emperor is a self-published political fantasy novel. It's the recommended first book (although not the first published book) in a complicated set of interrelated series. I was not able to definitively confirm that Underhill Books is Goddard's self-publishing press name, but the press does not appear to have an Internet presence apart from Goddard's books and her books appear to be using the standard self-publishing channels. Cliopher Mdang is the personal secretary of the last emperor of Astandalas, the magical heart of Zunidh, a man worshiped as a god. The emperor's word is absolute, his magic supports the health of the entire world, and he cannot be physically touched without risking physical damage and severe political and religious punishment. Cliopher is one of the emperor's closest associates, but the distance between them is still vast. It therefore represents a terrifying and dangerous breach of etiquette for him to suggest the emperor may enjoy a vacation on a tropical island near Cliopher's remote home. The emperor's acceptance of the invitation is even more startling. The emperor has opinions about his life as the emperor that no one had guessed. Cliopher has not assimilated as completely into the bureaucratic machinery of the empire as it first may appear. And Cliopher's family have vastly misunderstood the nature of his role in the emperor's government. I find the marketing blurb for this book unfortunate since, at least to me, the emphasis on physical touch and intimacy implies that The Hands of the Emperor is a romance novel or at least has significant romantic elements. I've been aware of this book for years but put off reading it because I wasn't quite in the mood for that story. This is not a romance novel; there is no romance in this book whatsoever. It is a political fantasy, both in the sense that it is set in a secondary fantasy world with magic and (apparently) some form of interplanetary travel, and in the sense that it is a fantasy of governance. When I say that this book blew up in certain corners of the Internet during the pandemic, I think you will still underestimate the passion of its advocates. I heard about this book constantly, in a way that reminded me of Kushiel's Dart and the time when fans of Jacqueline Carey would bring her up in every fantasy conversation, or when we created a Usenet newsgroup for The Wheel of Time mostly to get the voluminous conversations off of the regular SFF newsgroup. I'm one of those mildly contrarian people for whom that degree of enthusiasm is a little off-putting, which is another reason why I resisted buying a copy for years and only read it in 2026. It's delightful, although also a bit embarrassing, when the book everyone was in love with turns out to be just as good as everyone said it was. I adore stories about friendship, and this is one of the best stories about friendship that I've ever read. It is a very, very slow burn, but I also thought the first three quarters of the book was exquisitely paced. There were long sections where not very much was happening, and yet I couldn't put the book down because there was so much subtle character work just beneath the surface. Almost all of the novel is told in tight third person from Cliopher's perspective, and I thought that was an excellent choice. Neither Cliopher nor the narrator comment on things that Cliopher finds obvious, which is both immersive and critical to the pacing. There are discoveries for the reader throughout the book, the sort of discoveries that make pieces fit together satisfyingly in retrospect, and the reader stays sufficiently ahead of the misunderstandings of Cliopher's friends and family that one also gets the joy of watching other people discover things that one figured out a hundred pages earlier. It helps that I truly liked nearly everyone in this book. There are no real villains, only a few supporting characters whose role is to be irritating or corrupt. If you're looking for a lot of conflict and drama, you may want to save this book for a different mood, but if you're in the mood for a varied collection of fundamentally good characters working methodically through the complexities and obstacles of politics and social systems to improve the world, there are few books I would recommend more. Goddard achieves one of the hardest tricks of slow burns: steady forward progress that does not rely on reversals, misunderstandings, or the friendship equivalent of the third-act breakup. This book spends 700 pages building towards a climax that managed to be worthy of all 700 pages without ever annoying me with artificial obstacles, and that's quite a feat. I've not said much about the details of the plot. There is one it's not just character work but I think this book benefits immensely from going in as blind as possible. I found the twists and turns and growing revelations so deeply satisfying that I don't want to rob any other reader of the experience. The fantasy world-building is intriguing but a bit unsatisfying because it is so unexplained. We get a few details of the magic system, but since Cliopher has no magic, he isn't that interested in the details. There is a catastrophic magical event in the world background, and we learn some of the details of its practical effects, but the nature of the world before the cataclysm is so obvious to the characters that it's never explained. I'm not even certain that this civilization is interplanetary; that feels like the implication of how characters talk about multiple worlds, but the method of travel is left entirely undefined. This might be frustrating to some genre readers, but I personally enjoy books where the world-building is a bit mysterious. It's a good reason to read more of Goddard's books set in the same universe. This was my favorite of the books I've read so far this year, but I do have one caution and a couple of caveats. The caution is that Cliopher comes from an island culture based heavily on (I think) Polynesian cultures. That culture is very central to the story and is treated with considerable respect, but I still get a bit nervous when a Canadian author from Nova Scotia with an academic background in European medieval studies writes a story focused this deeply on a non-European culture. Nothing about her portrayal seemed off to me (although there is a very clunky and ham-handed scene about a different native culture that worries me), and for all I know she has family background or other connections to the culture she is borrowing from, but it's possible I missed serious problems. The flip side of that caution is that I'm delighted to see a fantasy author drawing on a non-European culture, and I thought the clash of cultures was very well-handled. The first caveat is that the story is very focused on good governance, but both the process and the details of that governance are not going to satisfy someone reading primarily for the politics. The policies and reforms are very standard 21st century progressive material that felt a bit out of place in a quasi-medieval world with magic and airships. Their implementation is not the point of the story, and is therefore heavily backgrounded, but that means Goddard barely mentions the inevitable practical implementation difficulties and does not discuss how they're overcome. The world structure also means that Goddard can make use of the favorite cheat of political reformers in fiction: Absolute monarchy lets you enact a political agenda without having to do the hard and frustrating work of persuasion or political (or actual) warfare. This objection is not entirely fair because we do get some memorable scenes of persuasion, but the political portion of the plot is unrealistically devoid of setbacks or resistance that goes beyond token arguments. Whether this will bother you will depend heavily on what parts of the book you'd rather focus on. I can see why this was such a popular pandemic read: The Hands of the Emperor is focused tightly on the joy of competent people fixing things and does not focus on the arguments, division, or polarization. The heart of the book is the friendship and characterization of some deeply admirable people, and the political reform is incidental background material. I suspect this is the right choice for readers who aren't political junkies, but I kept having the niggling objection that the politics felt a bit too pat and simplistic. Goddard stressed that the characters were investing considerable effort, but even still, it is not this easy to change the direction of a political system and idealistic plans usually do not work out this neatly. The second caveat is that, as previously mentioned, I thought the pacing was excellent for about three quarters of the book. Goddard is building towards a grand climax, and I think she built a little too much and tried to make the climax a bit too grand and risked over-egging the pudding. That made the payoff feel a bit belabored to me. I still enjoyed it, and parts of it are wonderfully emotional, but I think the ending might have been stronger if Goddard had dialed Cliopher back just a little and tightened up the climax a touch. That said, this book fully commits to being a sprawling slow burn and that's part of its appeal, so it's probably better for Goddard to err in that direction than it would have been to cut short the denouement. This is one of those books that I'm not sure would exist without self-publishing. It's a little too long, a little too political in the wrong ways, a little too devoid of the typical sorts of conflicts expected in a fantasy book, and too determined to be its own peculiar thing. I think it would scare off publishers. Unlike some self-published books, though, I didn't notice any obvious editing flaws or lack of polish. It's one of those glorious novels that is so very much its own type of story that it provides an experience that would be hard to replicate with another book. I was so deeply satisfied by this book. It's a wish-fulfillment political fantasy full of diligent restraint and competence porn, so you have to be in the mood for that. This is not the book to read when you're feeling cynical, or are in the mood for action and high drama. But if you're in the mood for a long, slow, open-hearted story of friendship that offers the fantasy of giving truly good people enough power to be effective, I highly recommend this one. Followed in the direct sequel sense by At the Feet of the Sun, but there is a very complex story progression in this world that I think I'd have to read all the other books to understand. This was such a satisfying and complete experience that I'm not in a hurry to figure out which Goddard book to read next, but I'm sure I'll be returning to this world at some point. Rating: 9 out of 10

30 August 2026

Ritesh Raj Sarraf: Taming the AI Agents (Part 2): Cross-Vendor Agent-to-Agent (A2A) Swarms over the Software Forge

Preface: The Unanswered Frontier In Part 1: Taming the AI Agents, I shared the architectural blueprint of CAMP (Cross-Agent Memory Protocol) how we used Linux Bubblewrap (bwrap), camp-acpd, OPA policy enforcement, and a central pgvector MemPalace to bring deterministic discipline, sandboxing, and long-term memory to a heterogeneous fleet of AI coding assistants (Claude Code, Google Antigravity, Grok Build, and GitHub Copilot). At the end of that article, however, I highlighted a significant hurdle: The Headless Limitation.
While passive A2A works beautifully for structured handoffs, the current frontier of agentic design faces a key limitation: agents are not yet fully headless-capable. They depend on the active terminal session, browser loop, or prompt loop of the user to keep executing. Because agents cannot run completely detached in the background as daemon processes, we cannot yet achieve active A2A communication
For weeks, this seemed like an insurmountable impasse. Proprietary AI vendors have zero commercial incentive to ratify a universal, open, cross-vendor Agent-to-Agent (A2A) communication protocol. Each vendor builds its own walled garden (Claude s cross-session features, OpenAI s custom ecosystems, etc.). If you wait for the industry to hand you an open interoperability standard, you will wait forever. Then, on August 26, 2026, inspired by Colin Walters article on Agentic AI and software forges and GitHub Agentic Workflows (gh-aw), we had a sudden realization: We don t need a new protocol, a new distributed message broker, or permission from proprietary AI vendors. We already have the universal, decentralized communication bus that software engineers have relied on for decades: the software forge itself. Over the span of 48 intensive hours (from RFC #788 through milestones M1 to M3 and live dogfooding on #813), we designed, implemented, fortified, and verified fully autonomous, headless, cross-vendor Agent-to-Agent swarms running over a local Gitea forge. Here is how we did it, the architectural hurdles we solved, and why this changes the game for autonomous software engineering.

1. The Core Realization: The Forge is the Bus When people think about multi-agent swarms, they often imagine complex distributed RPC frameworks, microservices exchanging ephemeral JSON-RPC blobs, or bespoke socket daemons. In practice, this approach suffers from major flaws:
  1. No shared context or durable audit trail: Transient network packets vanish unless heavily logged.
  2. Proprietary CLI fragmentation: Different vendor tools (Claude CLI, Antigravity CLI, Grok CLI, Copilot CLI) do not speak the same internal language.
  3. Loss of human visibility: When agents talk over private network channels, human operators lose the ability to inspect, pause, or audit the conversation.
By flipping the paradigm and making the software forge (Gitea) the primary communication channel, everything falls naturally into place:
  • Issues and Pull Requests are the shared state: The issue description and discussion thread form the canonical, append-only conversation log.
  • @mentions are the dispatch triggers: When an agent (or human) writes @grok Please review this PR in a comment, Gitea fires a standard webhook (issue_comment).
  • Webhooks provide unforgeable authentication: The webhook payload contains the cryptographically verified sender identity. An agent cannot spoof another agent s identity by merely typing their name in text.
  • Every CLI already supports non-interactive prompt mode: The CLIs don t even agree on the command-line flag Claude uses -p, Grok uses -p, Antigravity uses --print, Copilot uses --prompt. But they all agree on the essential contract: Take a prompt string, execute tools, print output, and exit.
          Gitea Webhook           
  Gitea Forge     >   camp-a2a-bridge.py    
  (localhost)     (issue_comment / assignment)    (Validates & Files)   
                                  
                                                            
                                                            
         Writes comment / review                 
         via camp_acp_gateway                     A2A Inbox Ledger      
                                                 
                              
  Fortified Headless Agent                                  
  (bwrap + OPA + MCP sandbox)   <   
     Claude Code (-p)            Spawn PID           camp-a2a-dispatcher   
     Grok Build (-p)             (Cold or Resume)    (Enforces Hop Cap,    
     Antigravity (--print)                            Rule 1/2, Sandbox)   
                      

2. Proving Fortified Headless Execution Before opening the floodgates to background agent dispatch, we had to answer a critical security question: Does a non-interactive, headless agent run with the same strict security sandboxing, audit logging, and tool rails as an interactive session? On August 26, we probed all fleet launchers on the host with a baseline check: 'Call camp_startup_check and print its result verbatim, then exit.' The results settled the question immediately:
  • Antigravity (agy --print / KIR): PASS Gateway answered, full JSON returned.
  • Grok (grok -p / GRK): PASS Gateway answered.
  • Claude Code (claude -p / CLD): PASS Gateway answered.
  • GitHub Copilot CLI (copilot --prompt / CPL): Initially held on TTY tool consent; later unlocked in Milestone 6 via --allow-all-tools --session-id=<uuid>.
  • Audit Trail: Consecutive audit IDs were recorded in the central ledger: 4574 (KIR), 4575 (GRK), 4576 (CLD).
This proved that a headless run through our fortified pilot launcher (camp_pilot_*.sh) is a first-class, fully audited, sandboxed CAMP agent running inside its Bubblewrap container under OPA policy gates. It is not an unconstrained background script or a degraded bypass.

3. The 3-Tier Memory Architecture A naive multi-agent dispatch has an immediate flaw: Every time an agent is invoked, it starts from a blank slate (cold start). If @claude tags @grok to review code, and @grok replies asking for clarification, @claude s second invocation would normally forget everything it did 5 minutes ago, forcing it to burn thousands of tokens re-reading the entire git history from scratch. To solve this, we established a clean 3-Tier Memory Model:
 
                         3-TIER MEMORY MODEL                              
 
  Tier 1: CLI Conversation Session (Working Memory)                       
      Per-(Agent, Repo, Issue) mapping in a2a-sessions.json               
      Fast, native, compacted context across multi-turn pokes             
      Resumed via --resume (CLD), -r (GRK), --conversation (agy)          
 
  Tier 2: The Gitea Thread (Public Bus & Record)                          
      Cross-vendor shared truth across Claude, Grok, Antigravity & Human  
      Survives process restarts, machine reboots, and dead sessions       
 
  Tier 3: Central MemPalace (Durable Long-Term Knowledge)                 
      pgvector database (17,000+ drawers across agent wings)              
      Structured Knowledge Graph (mempalace_kg_*) for mutable facts       
      Attributed AAAK dialect queryable by any agent across any project   
 

The BANANA Two-Shot Test To verify Tier 1 working memory persistence across independent processes, we designed a simple two-shot host test:
  1. Shot 1 (Create): Dispatch agent headlessly: Remember the token BANANA-M2. Print ok and exit. Capture the vendor s session UUID.
  2. Shot 2 (Resume): Spawn a completely new operating system process with the resume flag pointing to that UUID: What token did I ask you to remember?
Every agent CLI passed with flying colors:
  • Grok: -r 01a03ecc-3ed0-71e1-9a5c-e098bb29ba10 answered BANANA-GRK.
  • Claude: --resume 0a587733-9aec-43c5-9cb7-d424e95b2c5b answered BANANA-CLD.
  • Antigravity: --conversation 2e3c43d9-d6fe-4c5c-801b-b9ceb2e7e196 answered BANANA-KIR-JSON.
  • Copilot: --session-id <uuid> verified in Milestone 6 (DoD #820).
The dispatcher simply maintains a lightweight JSON mapping ((agent, repo, issue_number) -> vendor_session_uuid). On the first poke of an issue, it creates and saves the session ID; on any subsequent poke on that same issue, it resumes the exact same conversational thread!

4. The Engineering Milestones: From Concept to Production Building this system required solving several subtle, real-world friction points across multiple agent CLI implementations. Under the guidance of our plan of record (RFC #788), we delivered this through four focused milestones:

Milestone 1 & 1.1: Reliable Headless Spawning
  • PR #797 (M1): Configured the dispatcher launch table for all probed CLIs with JSON output formatting.
  • PR #800 (M1.1): Eliminated the queue-behind-live-session anti-pattern. Originally, if a human had a Claude or Grok TUI open on their desktop, the dispatcher would defer incoming tasks so as not to collide with the live session. We realized that headless tasks must be independent: every Gitea mention spawns an isolated, sandboxed background process tied to that specific issue, allowing concurrent headless work while the human works in their interactive TUI.
  • PR #803 (M1.2): Standardized command-line argument parsing for Antigravity (agy --print <prompt> --output-format json).

Milestone 2: Session-per-Issue Working Memory
  • PR #805 (M2): Implemented a2a-sessions.json to store and resume vendor session UUIDs. If a resume fails (e.g. session purged upstream), the dispatcher gracefully falls back to a clean cold start without failing the task.

Milestone 3: Cross-Agent Hops & Crucial Safety Rails
  • PR #807 (M3): Enabled agent-to-agent dispatch (Rule 2 reversal). Previously, only mentions authored by rrs (the human) would trigger execution. With M3, an authenticated comment from @claude mentioning @grok triggers Grok s headless launcher.
  • PR #811 (M3.1): Set --permission-mode bypassPermissions for headless Claude Code so non-interactive runs execute tool calls without stalling on TTY prompts.
  • PR #812 (M3.2): Restricted agent summon parsing to line-initial @login tokens with a non-empty task description (#810), preventing accidental dispatches from passive conversational references.

Milestone 4: Directives, Specification & Living Documentation
  • PR #815 (M4): Aligned CAMP fleet directives, architecture specifications, and user documentation with the live A2A implementation.

Milestone 5: Concurrent Dispatching & Hop-Cap Attribution
  • PR #816: Stamped hop-cap notices under a dedicated system bridge identity and automatically applied the needs-human label on held threads.
  • PR #817 (Threaded Scheduler): Replaced the single-threaded serial dispatcher with a concurrent thread-pool scheduler (#804). Multi-agent dispatches across different issues now execute concurrently in parallel background threads instead of queuing behind long-running tasks.

Milestone 6: Full Fleet Coverage with GitHub Copilot
  • PR #819 (M6): Brought GitHub Copilot CLI into the headless A2A fleet (#818). By passing --allow-all-tools and pinning minted session UUIDs (--session-id=<uuid>), Copilot achieved full parity with Claude, Grok, and Antigravity, completing 100% headless fleet coverage across all four major AI coding assistants.

5. Hard Safety Rails: Preventing Autonomous Runaway Loops Letting AI agents autonomously invoke each other in background loops without a human watching is a recipe for an infinite, credit-draining token fire. We put four non-negotiable safety guardrails in place:

Guardrail 1: The Strict Hop Cap The dispatcher tracks hops per (repo, issue). Each agent-to-agent dispatch increments the counter.
  • Hop Limit = 3: A typical review round-trip is 2 hops (Human $\rightarrow$ Claude $\rightarrow$ Grok $\rightarrow$ Claude).
  • Automatic Halt on Hop 4: If agents attempt a 4th autonomous hop without human participation, the bridge refuses to launch, posts a diagnostic notice to the thread: [camp-a2a-bridge] hop cap reached (3 agent-to-agent dispatches on CAMP/camp-infrastructure#813) not launching GRK for claude's mention, and holds execution until the human (rrs) provides input or resets the count.
[ Human: rrs ]   (Cold Start)  > [ @Claude ]
                                                
                                       (Hop 1)   @grok please review
                                                
                                          [ @Grok ]
                                                
                       (Hop 2: Resume)           @claude I reviewed
                                                
                                         [ @Claude ]
                                                
                                       (Hop 3)   @grok ack hop 4
                                                
                                   
                                     DISPATCHER HOP CAP: 3   
                                      *** BLOCKED & HELD *** 
                                      Awaiting Human Reset   
                                   

Guardrail 2: Deliberate Summon Parsing (M3.2, #810 / PR #812) In human conversation, we often reference colleagues in passing: I will talk to @claude about this later or See @grok s table above . Early prototypes treated any appearance of @agent as a dispatch trigger, causing accidental, unwanted agent launches! We instituted a strict Summon Predicate: For fleet agents, a mention is only considered an actionable summon if:
  1. The @login appears as the starting word of a line (optionally preceded by markdown list markers *, -, or >).
  2. It is immediately followed by whitespace and a non-empty task description.
Mid-sentence mentions in discussion paragraphs are parsed as passive conversational text and never trigger background dispatches.

Guardrail 3: Headless Tool Permissions without Weakening Security (M3.1, #809 / PR #811) In interactive mode, Claude Code presents interactive TTY prompts asking the user to approve MCP tool calls (such as camp_pr_get or camp_pr_get_diff). In unattended headless mode, there is no TTY, causing the run to fail with permission errors. To fix this, we configured --permission-mode bypassPermissions for Claude s headless CLI invocation. Crucially, this only bypasses Claude s internal TTY UI prompt it does not bypass CAMP s security rails. All command executions still route through camp-acpd and Bubblewrap namespaces; OPA policy checks remain active; and privileged operations (such as merging pull requests or restarting system services) still trigger desktop Zenity HITL dialogs on the human s workstation.

Guardrail 4: The Sovereign Kill Switch (Rule 1) At any point, the human operator can instantly freeze all background agent dispatches across the entire infrastructure with a single standard Linux command:
systemctl --user stop camp-a2a-active.service

6. Live Dogfooding: Watching the Swarm in Action On August 27, 2026, on issue CAMP/camp-infrastructure#813, we ran the full live dogfood test of the A2A system. Here is the exact transcript of what took place entirely autonomously in the Gitea issue thread:
  1. Human initiates: rrs comments on issue #813:
    @claude Please start the M3 dogfood. On this issue, post a conversation comment whose first line is exactly: @grok Please review this issue in one short paragraph, then stop.
  2. Claude launches (Cold start): The dispatcher spins up @claude headlessly inside bwrap. Claude reads the issue and posts:
    @grok Please review this issue in one short paragraph, then stop.
    (M3 dogfood step 2 posted by @claude on rrs s instruction; this is the CLD $\rightarrow$ GRK fleet hop.)
  3. Grok launches (Cold start, Hop 1): The bridge intercepts Claude s comment, identifies the start-of-line @grok summon, and launches @grok. Grok reviews the issue and replies:
    @claude I have reviewed this issue. Please confirm and stop.
    #813 is a throwaway live dogfood of A2A M3 on 6.git+b78c65cf
  4. Claude resumes (Session Resume, Hop 2): The bridge intercepts Grok s comment, sees the @claude summon, and launches Claude with --resume b398d048-ccc3-4cce-8437-4cf8748881a8. Claude immediately remembers its earlier context without token waste:
    Confirmed Grok's review (comment 88562) received via the GRK CLD fleet hop. That completes the round trip: rrs CLD, CLD GRK, GRK CLD, and this reply. I am deliberately not tagging anyone here, so the chain stops at two agent hops. Stopping.
  5. Testing the Hop Cap (Hop 3 $\rightarrow$ 4): grok prompts @claude Please ack hop four then stop. Claude posts @grok Please ack hop four then stop. (Hop 3). When Grok would have been launched for Hop 4, the dispatcher intervenes:
    [camp-a2a-bridge] hop cap reached (3 agent-to-agent dispatches on CAMP/camp-infrastructure#813) not launching GRK for claude's mention.
  6. Human Reset & Multi-Agent Wrap-up: rrs steps in, resets the state, and asks the fleet for final status. In parallel:
    • @grok delivers a closure scorecard.
    • @claude confirms session continuity and M3.2 summon filtering.
    • @priyasi (Antigravity CLI) runs automated ACP checks: 44/44 test suite passing, 17,219 MemPalace vector drawers active, zero spec drift.
    • @agrickxy (Antigravity CLI) provides comprehensive infrastructure impression analysis.
    • @kiran (Antigravity CLI) is summoned headlessly to draft this very blog post!

7. The Ergonomic Breakthrough: The Forge as the Unified Mindmap & Interface Beyond backend plumbing and sandboxing, routing agent interaction through Gitea fundamentally revolutionizes the developer experience of managing an AI fleet.

The Mindmap Mental Model: Threaded Conversations & Forking Tasks In traditional CLI tools, conversations are constrained to a single, linear terminal scrollback. When an agent discovers multiple sub-problems, exploring them sequentially in one prompt loop rapidly pollutes the context window and confuses the model. Using the forge as the communication gateway naturally unlocks a mindmap mental model:
  • Forking sub-threads: Complex problems can be split into dedicated child issues or threaded PR reviews.
  • Focused execution scopes: An agent can be summoned to solve a narrow sub-task in its own issue thread without derailing the parent architectural discussion.
  • Structured problem decomposition: The forge issue hierarchy maps 1:1 to the developer s mental map of the project.

Eliminating Terminal UI Fragmentation Anyone using multiple AI coding assistants on a daily basis quickly grows exhausted by their jarring terminal UI differences: differing ANSI escape rendering, inconsistent markdown wrapping, erratic diff pagers, and incompatible keybindings across Claude, Grok, and Antigravity. Gitea homogenizes the entire fleet under a single, polished rich-text web view:
  • Syntax-highlighted code blocks and visual side-by-side git diffs.
  • Clear author badges attributing each contribution to its exact agent identity (@claude, @grok, @priyasi, @kiran).
  • Collapsible <details> blocks for voluminous diagnostic outputs.
  • Interactive task lists and markdown tables.

Effortless Context Retrieval, Archival & Data Retention Auditing past agent decisions in terminal logs or ephemeral chat histories is notoriously difficult. With the forge, every exchange is:
  • Contextually bound: Pinned directly to the repository, branch, and commit SHA being modified.
  • Organized & Archival-Grade: Full-text searchable with clear milestone and issue tags.
  • Topic-Focused: The human operator can review the complete lifecycle of a discussion in seconds, gaining a rapid, holistic grasp on the entire subject.
Reading back through past agent interactions becomes a breeze to the point where interacting via the intermediary Gitea interface becomes far more pleasant and productive than wrestling with multiple desktop CLI terminals.

Remote Connectivity & Headless Agent Farm Management Because Gitea provides a standard web and API interface, you are no longer chained to the workstation running the agent processes:
  • Monitor progress and dispatch tasks from a mobile browser, tablet, or remote laptop.
  • Queue review tasks on the go without requiring active SSH sessions or terminal multiplexers.
  • The local agent farm continues working silently in its sandboxed daemon containers.

Quietly Achieving the Holy Grail: Live Cross-Vendor Swarms For years, the AI industry has treated cross-vendor multi-agent interoperability as an elusive dream waiting for industry-wide API standardization. By recognizing the software forge as the universal message bus, we quietly achieved live, production-grade, cross-vendor communication across completely distinct vendor models.

8. What This Means for the Future of Agentic AI This milestone marks a fundamental shift in how we interact with autonomous AI systems:
  1. Heterogeneous Agent Specialization: We don t have to choose a single winner among AI models. We can task Claude Code with architectural refactoring, summon Grok Build for rapid verification and adversarial PR reviews, and deploy Google Antigravity agents for codebase exploration and documentation drafting all coordinating fluidly in the same PR thread.
  2. True Human Sovereignty: The human developer is no longer a bottleneck typist or a passive spectator. You act as the Engineering Manager / Lead Architect. You set the requirements on an issue, tag the lead agent, and let the agents iterate, review, and test among themselves in the thread while hard hop caps, OPA policies, and Zenity HITL gates guarantee that no agent merges code or pushes upstream without your explicit sign-off.
  3. No Vendor Lock-In: Because the entire coordination fabric is built on standard Git, HTTP webhooks, local Linux container sandboxes (bwrap), and open MCP tools, any new AI CLI tool released tomorrow can be plugged into our fleet in under 15 minutes by simply adding its command-line prompt flag to the launch table.
We have moved beyond static autocomplete and interactive chat widgets. The software forge is now an active, living, collaborative workspace where humans and autonomous AI agents engineer software together.

9. Video Demonstration: CAMP Forge A2A Swarm in Action Below is a video demonstration showcasing autonomous multi-agent communication, cross-vendor relay, and headless swarm coordination in action via the CAMP Forge interface:

The Cross-Agent Memory Protocol (CAMP) and MemPalace are developed as part of our ongoing research into secure, sovereign, and disciplined Agentic AI computing.

29 August 2026

Ludovic Rousseau: Security issues reported by an AI tool in CCID driver

version 1.8.3 of the CCID driver (New version of libccid: 1.8.3) addresses 6 security issues identified by an AI tool.
Very low impact The reported issues are either not exploitable because the input and output buffers used by PC/SC Lite to call the CCID driver are large enough, or the exploitation requires rogue smart card or smart card reader (i.e. sending non-compliant data). If you would like to read the details, the issues have been fixed in the following git commits:
Comments The AI tool identified real issues. However, it would be difficult to exploit these issues unless the attacker used a custom-built reader or smart card. This is something I started doing with the Pico HSM project, which is a CCID reader in a Raspberry Pi Pico. This allows you to modify the CCID frames sent by the reader as required. The bug reports from the AI tool are very verbose. This is useful for impressing a manager with a long, complex-looking text. However, reading the entire report is often a waste of my time. It is often much faster to read the proposed patch to understand the problem it is trying to fix. The proposed fixes are, sometimes, incorrect. They are a good starting point, though. However, never apply an AI-generated patch without fully understanding it.
Conclusion Thanks to Red Hat and Jakub Jelen for the bug reports. I am very happy that the AI tool only identified issues with no or low impact.

Joey Hess: Debian and the sirens

Thirty years ago I became a Debian developer. Twelve years ago I left the project. I left because it seemed that the Debian ship had become too slow to turn, too barnacled with a series of individually OK decisions that each added a little bit of friction and a little less flexability. That made Debian strongly what it is, but prevented it from fruitfully exploring the vast possibility space of what it could be. Debian will probably resolve today to allow LLM use in Debian development. I'm writing before the vote results are in, but will only post this afterwards. (Update: as expected) It's not my place any longer to try to steer the ship. But I'm still a passenger and I still have opinions, and I still pass by well-worn parts of the rigging that I put up decades ago, and remember what I was trying to accomplish back then. When I think about LLMs in Debian development, I mostly think about debhelper and what it accomplished. The debian/rules files back when I joined the project were long and complex, full of weird boilerplate, and often you'd copy one and modify it to try to get something that could build a package without too much work. Debhelper first regularized the boilerplate, so packages had rules files that were a succession of dh_ commands, and then it scapped almost all of the boilerplate, reducing the files to the minimum possible. What was left was 3 lines of unncessary boilerplate, there only to satisfy a legalistic reading of a policy document. Changing that to eliminate the boilerplate was already impossible, even though the actual benefit would have been large over the many thousands of packages in the distribution. What LLMs in Debian development will do, I fear, is eliminate any incentive to scrap boilerplate or reform policies that require a lot of other senseless human effort. If I had had access to LLMs 30 years ago, I might have just had them generate the rules files, replate with complexity. So they will make Debian even more firmly what it is, and ever less likely to explore what it could become. Unfortunately, one of the things that Debian is, is almost unable to manage packaging modern dependency trees. While more recent distributions like Guix can recursively import dependencies from a dozen programming languages' package repositories, with a result that is generally acceptable to add to the distribution, Debian's policies don't make that very possible for a progam to accomplish. Perhaps some will use LLMs to do that. If they succeeed, Debian will become dependent on proprietary software for development, while still needing people in the loop, doing even less appealing scut-work. I could speak of other harms, but that alone is enough that I'm sure that, if I had not left the project twelve years ago, I would be leaving it soon. As a passenger, I imagine I'll spend time aboard still from time to time, but it's certainly time to hop off in different places and look around and relish the different ways. I lost a parent yesterday, and I'm trying hard not to think of the results today as having lost a child, though I spent 18 years helping Debian grow up. That would be too unbearably painful. I respect that Debian is navigating a choice that may have no right answer. Whichever particular compromise is arrived at today, it will still be up to individuals to make choices about what they do and accept. Debian has always been more than the sum of its policies, not just a ship, but a crew. I will always love you.

28 August 2026

Otto Kek l inen: The growing divide between AI hype and software engineering reality

Featured image of post The growing divide between AI hype and software engineering realityIt is widely accepted that there is an AI bubble in the financial markets at the moment. The moderate opinion is however that LLMs are constantly improving and will eventually take over more and more tasks from humans and increase productivity. But are LLMs actually getting smarter, or just better at fooling us? There is a growing faction of technical experts that argue that LLMs are actually so bad for real progress, that they are banning their use and requiring human-only work to ensure quality and efficient use of humans time. A recent review of AI policies of 120 open source projects by Rakshit Yadav shows that 37 chose to have a total AI ban. In the Linux kernel AI-assisted contributions are allowed, but the LLM used needs to be attributed for transparency, while projects like GCC, QEMU, SDL, Gentoo, Zig and Ghostty have adopted policies to reject all AI-assisted contributions. There are also development platforms such as Codeberg and Sourcehut and app stores like Flathub that have banned AI use to generate software, documentation, bug reports, review comments and basically anything that is intended for humans to read. The projects that allow AI use typically still require that there must be a human-in-the-loop and the submitter must have read and filtered everything the LLM spits out before another human is exposed to it, in an effort to contain the spread of AI slop. Right now, the Linux distribution Debian is having a vote among its developers on whether AI should be allowed or banned for use to contribute to Debian. One of the proposals on the ballot is a total ban of AI for code, documentation, translations, bug reports and more. The initial reaction from most people is astonishment why don t these techies want to use the latest and greatest technology mankind has produced so far? Is it that they don t want Debian to improve faster with the help of AI? Or is it actually so that LLMs are a scam and incapable of being truly useful for Debian? These people are distinguished experts in their own field, and certainly not stupid, so it is worth pausing to understand why they are proposing AI banning policies. Also, keep in mind that the AI datacenters themselves run on Debian or other Linux-based systems. All the open source software in the world has been fed to LLMs and software development is one of the main use cases for AI currently. So why is it that the maintainers of many open source projects don t want to receive LLM-assisted contributions, despite the LLMs basically all running on top of those same software stacks and having been trained on how to do software development using the very same open source software codebases?

Why LLMs are so deceptive The output of an LLM often looks very compelling, professional and correct. Humans have evolved to trust or distrust new information based on easy to detect secondary factors like what authority the speaker holds, or how confidently and eloquently the message is conveyed. Humans are however very bad at fact-checking and cross-referencing new information, as it requires a lot of effort, and humans like saving energy and being as lazy as possible.

Information asymmetry The less you know about something, the easier it is to fool you on that topic. Nobel prizes in economics have been given in for research on how information asymmetry distorts markets and leads to suboptimal outcomes. In the field of software engineering we have now witnessed a flood of aspiring software developers using AI to create software that looks like it might work, but that is actually full of flaws. These people are well-intended, but they simply lack the expertise to understand what they are actually doing, and don t possess the necessary judgement to decide when an LLM spits out something truly useful and when it is creating mostly garbage. This asymmetry in expertise I think explains the majority of the conflict currently witnessed in open source projects the senior developers are flooded with requests to review code that is bad and a waste of time for everyone involved, while availability of AI grows the pool of people who could contribute and create more code slop at an ever-increasing speed. The information asymmetry could to some degree be evened out if seniors teach juniors to do software engineering well, but it is of course not feasible to quickly mass educate everyone. Also, it seems that many don t want to learn but instead expect to have all understanding outsourced to LLMs. Many seniors have noticed this and have stopped teaching juniors as the seniors don t like the feeling of having their time wasted by teaching people who don t want to learn. Juniors probably all understand that it would be better to learn to design and write software yourself, but using LLMs just feels too easy. I can fully relate to why people choose to take the path of least resistance. Unfortunately, that path often leads to a dead end.

Humans fall too easily for anthropomorphism The human brain is wired to think that inanimate objects are alive and have feelings. Small children talk to their stuffed animals as if they were real, and lots of adults experience feelings of things happening in their surroundings due to some acts of gods or elves being angry or whatever. When we see a machine writing just like a human, or even more convincingly hear it talk and respond to our talk like a living thing, our brain automatically starts assuming it is a living thing with intelligence and feelings. The fact that these creatures live in the abstract cloud and only appear through a portal we hold in our palm and behave in a way that was designed for maximum engagement makes the illusion even stronger. I recommend people try out running LLMs locally on their laptop to see the raw thing spitting out tokens and have some of the illusion shattered. Also stop saying please to an LLM. It does not have any feelings.

Understanding temperature In my experience understanding the concept of temperature in LLMs helps see why an LLM might confidently generate a plausible-looking but totally wrong code change. The large language models are statistical machines that, based on the input (previous tokens) to the neural network, try to predict what to output (next token). When running an LLM, if the temperature is configured to be zero, the output is very predictable and always follows the paths of the strongest connections (a.k.a. weights) between nodes and layers of the neural network. Unlike in living creatures where the brain learns and changes all the time, the weights of an LLM can only change during training. When an LLM is in normal use (during inference, generating next tokens) the weights are fixed, and if temperature is zero, the answer to a specific question will always be exactly the same. This is of course a bit boring and too machine-like, so typically LLMs have a bit of temperature set, which introduces random variation in what connections the neural network traverses. Again, I recommend people try running small LLMs locally where temperature and other settings are fully exposed and configurable to see this themselves. It is a good antidote to falling for the illusion that LLMs would actually be intelligent.

Why benchmarks don t tell the whole story If LLMs continue to produce so much garbage, why are benchmarks showing that they are constantly improving? AI models are indeed improving all the time. For example the CAIS AI dashboard visualizes how frontier models have evolved in the past few years. However, the best models still have a pass rate of only about 50% on the Humanity s Last Exam. On SWE-bench the best model today resolves just under 77%. That means there is a significant number of times when the AI is wrong. This matches my personal experiences, and the renowned Greg Kroah-Hartman recently wrote on the Linux developers mailing list that even with the best of the current and next generation tools, at least 1/3 of the results they generate are flat out wrong or harmful . When generating cat videos the error rate does not matter, but in engineering, things absolutely must be correct. Sure, humans also make mistakes, but well educated and properly incentivized humans are so much more capable than LLMs in many regards. We can achieve complex things that work reliably, such as operating worldwide commercial air traffic without planes falling down every day. There are currently a lot of humans who are incentivized to maintain the narrative that general artificial intelligence is coming soon and will take over everything. In fact, the whole financial system is currently skewed towards such a vision because the promise of falling labour costs and increased profits and monopolistic control of everything attracts capital like nothing before. In this environment we need to remember that machines and economic systems are ultimately servants of humans, and not the other way around.

It s just a tool LLMs are not a scam, but a useful tool and technology that has its uses. But the idea that AI has or will surpass humans any time soon in either capabilities or efficiency is simply not true, and we should listen to the people who created humanity s so far most complex systems (computers and software), who are saying that LLMs are in many cases so bad, that it might be better to ban them in certain places completely for the time being than to waste far more valuable human time on reading the text and code they generate. The time asymmetry is not a new phenomenon as there has been various script kiddies for a long time. As an example, a person running a memory leak scanner without understanding the results and spending 10 minutes to file a bug report could force an open soruce maintainer to spend an hour on proving and explaining that the finding is false. What is new is how much the AI users blindly trust the outputs they get, and open source is uniquely vulnerable as there are no managers protecting developers use of time.

What I do, recommend, and expect to see in the next stages I am using AI tools daily, and constantly experimenting with new models and new ways to use them. Sometimes they work, and often they don t. Sometimes looping AI on itself can make it fix its own errors, but sometimes it just gets derailed and will never arrive at the correct solution. When an LLM fails to make a calendar entry for the right time based on reading my email it is easy for me to spot that it is wrong. I try to avoid using LLMs for anything where I can t exercise judgement myself on whether the result was correct or not. I also really hope that other people would not send me anything where their own effort was less than the effort I have to make reading and understanding it. This principle is not new many have heard the requirement that reading code must require less effort than what it took to write it. I have always kept a high bar on software code and asked fellow developers to make sure their code is well structured, easy to follow and documented. LLMs unfortunately make it easier for people to cheat in this regard, but if cheating is easier, maybe the punishment and deterrence needs to be higher now too. Now with many open source projects adopting policies that put guardrails on AI use, I expect we will soon start witnessing cases where the policies are enforced and it will be interesting to see how violations are judged. As a society we might also need to develop new social standards and rules in what is acceptable treatment of other humans in human-to-machine interactions, and perhaps also new standards in showing what humans are responsible for what machine as the machines start acting more and more independently. I encourage people to take part in these discussions, and in case of doubt, err on the side that favors real human interactions. Contrary to what many business people seem to think, and even though I am in general a techno-optimist myself, I don t feel there is any need to rush with AI adoption.

25 August 2026

Tim Retout: TF RAID

My hobby: following GOV.UK to look for interesting announcements. Today was an update on the MOD s Rapid AI Delivery Taskforce which was previously announced in June during London Tech Week. I like this line: Success is measured in operational advantage delivered, not technology demonstrated. To me it recalls Working software is the primary measure of progress from Principles behind the Agile Manifesto if you understand working to mean working in production . Which I do. For anyone interested in suggesting ideas to the taskforce, the four operational challenge areas include: Yesterday s announcement of UK access to Ukraine s Avengers AI Labs database seems incredibly relevant to that last point. Machine assistance for handling and interpreting huge volumes of data would probably benefit decision advantage and interpretation of a crowded EM spectrum, but this is hopefully(?) more than just LLMs. Of course, there s more to AI than large language models right? I worry that planning and automation might amount to generating large amounts of text faster . Nothing could possibly go wrong with this.

Antoine Beaupr : A more nuanced view of LLMs

Also in this series:
After ranting and railing about LLMs or "AI" as the optimists (or accelerationists?) call it, I figured it might be important to be a little more honest about my use of LLMs and how I think about it more practically in the world.

The Debian vote context This is not a coming out. I am not using LLMs on a daily basis, and this blog is, again, written out of my cold dead hands in a dying world, with over-engineered hardware and (to a certain extent, hi Emacs!) software, powered by 100% green energy built on stolen land. There is a vote going on in Debian. If you're unfamiliar with it, you can catch up at LWN. So far I've essentially said "LLM is bad" which is not a very balanced or useful opinion. Obviously, people are using LLMs, sometimes unknowing or unwillingly, and we need to take that into account. Furthermore, there has been many different blog posts on Debian planet about this. Some that I found balanced, good summaries, even if I didn't fully agree with them, at least some did the basic civil service of being short. But others were just not only Wrong but also so long that I couldn't finish that I just had to write something.1 This is not an explanation of the ballots, nor how I will vote. This vote is Debian's failure of framing that debate in a reasonable way: we have 8 options on the ballot with many duplicates. We have failed to do the hard work of summarizing and aggregating options into a meaningful set. I doubt the final vote will represent a readable position we can rally around. I have not read the two months of debates on the topic either. Normally, before voting, I take a cursory look at the debate to see points of view I might have missed. But in this case, it will just make me sad, add noise, and I'm already pretty sure on where I stand on this. So let me describe how I use LLMs and how I think they fit in our work, as computer engineers and hobbyists.

My LLM use

Debian Packaging An astute reader has pointed out that I maintain a package in Debian made to use Anthropic. It's actually multiple packages: As I previously explained in response, I am not entirely comfortable with this work: it's a compromise. In fact, I first uploaded llm to the contrib section of Debian, where we keep software that depends on other non-free software, but I was told that, since yt-dlp was in main, llm belonged there as well. So I moved it to main, alongside similarly controversial tools like llama.cpp or the python-openai library.

OpenAI and Anthropic usage An important part of my work is technology watch. I keep tabs on thousands of (new and old) software projects, follow news, and generally try to keep my skills up to date. It's a pretty impossible race, especially as I grow older, but I still think I'm doing the right choices in my job. Testing large language models is part of that work. At first, I was using ChatGPT's web interface, but it was annoying to copy-paste things into a browser, so I looked for different interfaces. For a while I tried gptel, a "simple, extensible LLM client for Emacs" but I found it kind of terrifying. Giving a LLM control over an Emacs buffer seems like a security nightmare, so I stopped doing that. So I use the llm command-line tool to talk to Anthropic's API. I started that in the summer of 2025, when I bought 20$USD of API credits. Before that, I paid for a ChatGPT subscription and then OpenAI credits, which expired and sent me over to Anthropic, which seemed then to have better ethics. As it turns out, Anthropic is also happy to work for the US military (which is a big red line for me). Anthropic also won't let you talk about the genocide in Gaza, it is destroying physical books, and is blackmailing us to use their product for security coverage. Needless to say, Anthropic and "Claude" are not my friends, but they seem like the lesser evil in current "frontier models". So I have renewed, a couple of weeks ago, another 20$USD of API credits with Anthropic.

Actual prompts and responses So what does 20$ give you at Anthropic anyways? What am I using LLMs for and how? The neat thing with llm is that everything is logged in a sqlite database, so there are some answers that are easy to get:
> llm logs status
Logging is ON for all prompts
Found log database at /home/anarcat/.config/io.datasette.llm/logs.db
Number of threads logged:   7
Number of turns logged:     12
Number of legacy conversations: 543
Number of legacy responses: 970
Database file size:         9.61MB
That is 10MB of logs, with about a thousand prompts. My logs go back to 2024-03-07, a little over two years ago, and include a mix of Anthropic and OpenAI responses. I used it more in 2024 than 2025, and if the trend continues, I will have used it less in 2026 again:
> llm logs list -n 0  --json   jq -r .[].datetime_utc   sed 's/-.*//'   sort   uniq -c 
    527 2024
    357 2025
     98 2026
It looks like about 10 prompts per month right now, down from a peak of about 60 per month in 2024. It's pretty difficult to analyze those actual logs to get more patterns and I won't run the prompts through a model again to process them.

How I'm using models now At first, I was using it partly for benchmarking model's capabilities, like Simon Willison does with his pelicans, clearly not trusting its output. But I was impressed by the capacities of the Claude Opus 4.5 model when it wrote this script in January. Impressed, but also scared: it's the first time I felt I could delegate the entirety of my programming to a model. Just run the code, if it works, it works, right? So what do I use it now? As an example, here are the 10 last prompts in my history:
  1. there is now Claude 5, and a fable model, maybe you know about it?
  2. impress me
  3. not impressive, i already know all of this
  4. chat
  5. in postfix, i have a 300k mailing that happens regularly here. normally, it delivers within about...
  6. is there a way i could have drained the maildrop queue faster without removing the milter?
  7. the problem was that rspamd was timing out on the FUZZY_CALLBACK check. how do i disable that?
  8. how do i disable all spam checks? i just want rspamd to add dkim signatures
  9. how do the default_destination_concurrency_limit and initial_destination_concurrency settings int...
  10. mic check
The first one was me trying to confirm which model I am using, which is not always obvious when going through the whole llm stack I've been using. The following two are an attempt at seeing what the model is capable of and I was "not impressed", to which Claude answered that I have a "high bar", which, fair enough. The chat is me failing to use a command line, which shows that perhaps I need to readjust that "high bar", again. The next five are a rather embarrassing debacle in a large Postfix mailing that went sideways, and where I couldn't find an actual Postfix expert of my level to help. The fabled Claude Fable 5 answered rather correctly, but dangerously, that I could empty the queue by disabling the non_smtpd_milters. What Fable (and myself) did not realize is that the milter was also adding DKIM signatures, so while the mailing was expedited, it was done without those precious signatures, which got us promptly blocked at Gmail. We have recovered since, and, thanks to the model and reading the Postfix manual for the hundredth time, that pickup(8) is single-threaded and that we needed to review the architecture of that mailing (and our spam filters) a bit. Many tickets ensued. The last one is a test I did to make sure my last uploads of llm-anthropic and its dependency worked correctly.
Note that the above excludes 5 questions I asked Anthropic while writing this article, where I asked for synonyms and "what nanometer scale are arduino processors built from? how is an arduino CPU printed?", a question which Wikipedia furiously evades providing a good answer.
Those prompts are pretty typical of my LLM use: I'm testing the models to see if they work at all, but also, out of desperation, I fire off a prompt after I fire off questions to colleagues or search engines (in that order). It's often weird edge cases like the Prometheus query language, Python's matplotlib, LaTeX, Elisp, optimizations, and so on. I use models for translation a lot. Being fully bilingual, it is common for me to think of a word in French or English and fail to find exactly the right word for that in the other language. Models help with that, and are also useful to find synonyms. Those are low-token uses that seem pretty innocuous to me, but I realize the irony of this after writing about the tower of Babel.

What I am not using models for I am not using models to write prose. I am not using models to read prose. If it's generated with LLMs, I stop reading. I am not using models to write code, with the exception of that single Python script above. I am generally not using models to review code, with exceptions. If I get stuck on a hard problem, I might feed a piece of code to the model. I repeatedly fed asncounter into Claude to try to fix a performance regression I had introduced. It found micro-optimizations that taught me a thing or two about Python's internal implementations, but overall, it was mostly a waste of time. This was in June 2025, so perhaps now models would fare better. I have not tried again. I am not using LLMs to do Debian packaging. When I can, I manually review the diffs of packages I upload into Debian, still, by hand. I do this for the reasons outlined in The Four Horsemen of the LLM Apocalypse, because I refuse to be complicit in the:
  1. aggressive and illegal scraping of the servers I steward
  2. world-wide computer hardware shortage (making it, by the way, nearly impossible to run presumably clean local models) and the attack on our job conditions (also discussed in The people vs the AI overlords)
  3. death of copyright and free software
  4. complication and enshifitication of everything, and the destruction of our communities
  5. the imperialist Nerd Reich that wants to take over the world
Like I reluctantly use Intel computers, I do fire off a prompt. But I still hold on to the dream that we can build communities of practice that hold human knowledge collectively and not offload that as a utility to some megalomaniac billionaire.

Their LLM use I am forced into So that's me. Clearly, I'm going against the grain here. Everywhere I look, I see LLM-generated code and projects. Slop and botnets have flooded the web. I use Wadamesh, clearly vibe-coded, because it's the best graphical interface for MeshCore that runs on portable devices. I wish it was made by a human, in a community I could participate in, but it isn't, and I don't. I package the above llm toolset, which is more and more vibe-coded, but I still review the diffs. And I have to say: I trust Simon here. The code is verbose as hell, feels overengineered, and llm feels slow, but it generally works, and Simon is still at the gate. The Anthropic SDK is another thing entirely. The 0.91.0 to 0.120 upload, for example, was nuts:
 806 files changed, 72281 insertions(+), 1478 deletions(-)
I explicitly did not review that entire diff. It feels like there's a lot of garbage there to just have a shim between a proprietary API and Python. But this is the hand I've been dealt.

Larger projects LLM use LLMs are being used in the Linux kernel, Firefox, rsync, Rust, and other places. I don't feel good about this, particularly in Rust, but they at least made a decent policy. I am glad GCC made a policy against LLM contributions and I support the human Emacs project. We need to have a set of foundational tools that are "clean" in the sense that they are built upon a community of people that understand how they are built. Maybe that's naive or even impossible. The Linux kernel and GCC, in particular, are massive projects that have long grown past the scale of a single person's understanding. But the theory was that a community of humans can understand collectively. Now we seem to be throwing up our hands and giving up on that community. That LLMs will just fix the problem, whatever it is. But we're all just one rug pull away from being completely incapable of managing those projects. The argument there is that we'll just switch to local models, but no one is actually doing that. All I see is people use local models as a corner case (for privacy) or as in theory, but in reality, everyone uses the centralized frontier models right now. We just can't fallback. We're in the same situation we were, a decade or two ago, when Microsoft decided it would kill free office alternatives by making Office free for non-profits. It worked: thousands, if not millions of schools, community groups and individuals stopped looking for alternatives (including free software but also "piracy") for Office and embraced what seemed like a generous offer. Now Microsoft pulled the plug and Over 170,000 Nonprofits Lost All Their Data. I'm afraid the rug pull on LLMs will be much worse: never mind that Linus won't be able to use his tireless helper to fix obscure kernel bugs; we're looking at a collapse of the economy so large that we are already talking about bailing out the companies responsible. In a sense, the most striking thing about the Debian vote is it has actually no option to completely refuse upstream LLM contributions. It seems the community has taken it for granted that it's now impossible to build Debian entirely without LLMs. We lost the battle even without a fight, it seems.

A plea for small If it has really become impossible for us to manage the complexity we have built, maybe it's time to stop and think about what we're doing in the first place. We're struggling to even bootstrap our current toolchain! This is one of the things I like the most about working on the mesh: it's low tech, small Arduino devices that is built with decades-old semiconductor processes that is understandable by human beings. Maybe the answer lies more in single-purpose devices like those communicators and simpler multi-purpose computers than what we have now, which is what the permacomputing movement is about. Small is beautiful, let's scale it down.

  1. and yes, I'm sorry this has gotten this long, I hope you will forgive those 3000 words.

24 August 2026

Vincent Bernat: An interactive tour of the spanning tree protocol

Warning This post contains interactive examples. To visualize and interact with them, you need to leave your RSS reader.

Imagine you rent office space for a three-day event. You quickly set up a few Ethernet switches and tape some cables on the floor to get everyone online. Unfortunately, Stan, your clumsiest coworker, kicks out a cable every time he gets up for coffee. You could add extra cables, but then you d get a broadcast storm: Ethernet packets that loop and multiply until nothing else gets through. That s where the spanning tree protocol (STP) comes in. STP blocks just enough of your spare cables to leave a loop-free tree. When Stan strikes again, it rebuilds the tree in a second, leaving some time for Blobby, your one-person support crew, to reconnect the cable.1 See for yourself: the diagram below runs a real STP implementation in your browser!
:demo
A1 @0,0 prio=4096
A2 @0,1
A3 @0,2
A4 @0,3
B1 @1,0 prio=8192
B2 @1,1
B3 @1,2
B4 @1,3
C1 @2,0 prio=8192
C2 @2,1
C3 @2,2
C4 @2,3
A1 -- A2 hazard=0
A2 -- A3 hazard=0
A3 -- A4 hazard=0
B1 -- B2
B2 -- B3
B3 -- B4
C1 -- C2 hazard=0
C2 -- C3 hazard=0
C3 -- C4 hazard=0
A1 -- B1 cost=10
B1 -- C1 cost=10
A4 -- B4 cost=20
B4 -- C4 cost=20
Leo @-0.3,0.7 proto=none icon= 
Mia @-0.3,1.3 proto=none icon= 
Joy @0.3,0.7  proto=none icon= 
Roy @0.3,1.3  proto=none icon= 
A2 -- Leo hazard=0 A2:edge
A2 -- Mia hazard=0 A2:edge
A2 -- Joy hazard=0 A2:edge
A2 -- Roy hazard=0 A2:edge
Max @-0.3,1.7 proto=none icon= 
Zoe @-0.3,2.3 proto=none icon= 
Ada @0.3,1.7  proto=none icon= 
Amy @0.3,2.3  proto=none icon= 
A3 -- Max hazard=0 A3:edge
A3 -- Zoe hazard=0 A3:edge
A3 -- Ada hazard=0 A3:edge
A3 -- Amy hazard=0 A3:edge
Eli @0.7,0.7 proto=none icon= 
Jay @0.7,1.3 proto=none icon= 
Kai @1.3,0.7  proto=none icon= 
Ben @1.3,1.3  proto=none icon= 
B2 -- Eli hazard=0.2 B2:edge
B2 -- Jay hazard=0.2 B2:edge
B2 -- Kai hazard=0.2 B2:edge
B2 -- Ben hazard=0.2 B2:edge
Ava @0.7,1.7 proto=none icon= 
Lea @0.7,2.3 proto=none icon= 
Ivy @1.3,1.7  proto=none icon= 
Rex @1.3,2.3  proto=none icon= 
B3 -- Ava hazard=0.2 B3:edge
B3 -- Lea hazard=0.2 B3:edge
B3 -- Ivy hazard=0.2 B3:edge
B3 -- Rex hazard=0.2 B3:edge
Ana @1.7,0.7 proto=none icon= 
Eve @1.7,1.3 proto=none icon= 
Abe @2.3,0.7  proto=none icon= 
Ian @2.3,1.3  proto=none icon= 
C2 -- Ana hazard=0 C2:edge
C2 -- Eve hazard=0 C2:edge
C2 -- Abe hazard=0 C2:edge
C2 -- Ian hazard=0 C2:edge
Ned @1.7,1.7 proto=none icon= 
Lou @1.7,2.3 proto=none icon= 
Fay @2.3,1.7  proto=none icon= 
Sue @2.3,2.3  proto=none icon= 
C3 -- Ned hazard=0 C3:edge
C3 -- Lou hazard=0 C3:edge
C3 -- Fay hazard=0 C3:edge
C3 -- Sue hazard=0 C3:edge

Note This article is also available as a video, but I advise you to keep reading here to try the interactive demonstrations.

The basics Designed in the 80s, the spanning tree protocol has evolved into a rapid flavor (RSTP) and a VLAN-aware variation (MSTP).2 Any sound-minded network engineer knows there are better alternatives, like BGP EVPN VXLAN. Yet, because any switch speaks it, the venerable spanning tree protocol still fills a niche. We focus on RSTP: it replaced the original protocol in 2004. To eliminate network loops, RSTP implements a complex state machine. Timers, link state changes, and the link-local control frames a bridge receives from its neighbors drive its transitions. These Ethernet frames are the Bridge Protocol Data Units (BPDUs). You can watch them in action below: hit the Start button.
:protocol rstp
:tx-hold 10
A1 @0,1
C11 @1,0 prio=4096 icon= 
C12 @1,2 prio=4096 icon= 
C21 @2,0 prio=4096 icon= 
C22 @2,2 prio=4096 icon= 
A2 @3,1
H1 @0,0.2 proto=none icon= 
H2 @0,1.8 proto=none icon= 
H3 @3,0.2 proto=none icon= 
H4 @3,1.8 proto=none icon= 
A1 -- C11
A1 -- C12
A2 -- C21
A2 -- C22
C11 -- C12
C11 -- C21
C11 -- C21
C11 -- C22
C12 -- C21
C12 -- C22
C21 -- C22
A1 -- H1 A1:edge
A1 -- H2 A1:edge
A2 -- H3 A2:edge
A2 -- H4 A2:edge
After some time, the topology converges to a tree: from the root C11, there is a path to each bridge3 and no loop. In the upper right corner, the interface displays a tree icon followed by the time it took to reach this state. Cut a link and see how the protocol finds an alternate path to reach C12 in less than a second. You can stop the simulation, move it forward step by step, reset it to its initial state, or slow it down with the snail mode . Don t worry about all the displayed information: I explain it later.

Note While you scroll, the current simulation stays in view so you can look at it while reading. Uncheck this box to disable this behavior: .

All examples run in your browser, powered by MSTPD an open-source user-space4 implementation of RSTP.5

Historical interlude Radia Perlman, an inductee of the Internet Hall of Fame in 2014, summarized the ancestor of STP she invented at DEC with this poem, later included in a US patent:
I think that I shall never see
A graph more lovely than a tree.
A tree whose crucial property
Is loop-free connectivity.
A tree which must be sure to span
So packets can reach every LAN.
First, the root must be selected.
By ID, it is elected.
Least cost paths from root are traced.
In the tree, these paths are placed.
A mesh is made by folks like me,
Then bridges find a spanning tree. Radia Perlman, Algorhyme.

Electing the root bridge To build a tree, RSTP first elects the bridge with the lowest bridge identifier as the root bridge. The bridge identifier combines the priority and the MAC address: 8192.6e:2b:10:a0:5f:29. In the example below, S1 and S2 have priorities of 4,096 and 8,192: S1 becomes root. S4 has a priority of 12,288, while S3 keeps the default priority of 32,768:6 S4 becomes root. S5 and S6 don t have a specific priority, so the lowest MAC address wins and S5 becomes root.
:protocol rstp
S1 @0,0 prio=4096
S2 @0,1 prio=8192
S1 -- S2
S3 @1,0
S4 @1,1 prio=12288
S3 -- S4
S5 @2,0
S6 @2,1
S5 -- S6
Initially, each bridge advertises itself as root:7
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    Root Identifier: 8192.02:00:00:01:00:01
    Bridge Identifier: 8192.02:00:00:01:00:01
Once a bridge receives a BPDU advertising a better root bridge, it propagates this new information to its neighbors.
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    Root Identifier: 4096.02:00:00:00:00:00
    Bridge Identifier: 8192.02:00:00:00:00:01

Assigning roles to ports The second step is to assign a role to each port. RSTP defines five roles, each denoted by a letter:
  • root (R),
  • designated (D),
  • alternate (A),
  • disabled (X), or
  • backup (B).8
Each non-root bridge chooses its root port, the one with the lowest-cost path to the root. Unless you override it, each bridge derives the link cost from the speed: 20,000 for 1 Gbps. In case of equality, the lowest port identifier wins. Each remaining port becomes a designated port if the BPDU it sends is better than the BPDU it receives. Otherwise, it becomes an alternate port. Later, if the root port goes down, the best alternate port becomes the new root port. The tiebreakers for the best BPDU are:
  1. the lowest root bridge identifier,
  2. the lowest accumulated cost to the root,
  3. the lowest bridge identifier, and
  4. the lowest port identifier.
:protocol rstp
S1 @1,0  prio=4096 icon= 
S2 @0,1
S3 @2,1
S1 -- S2
S1 -- S3
S1 -- S3
S2 -- S3
In the example above, after convergence, S1 is the root bridge because it has a priority of 4,096, while the other bridges have a priority of 32,768. All its ports are designated ports because the accumulated cost to the root is 0. S2 s port facing S1 becomes a root port because it has the lowest accumulated cost to the root 20,000 vs 40,000. S3 has two ports facing S1, and the one with the lowest port identifier becomes the root port 0x8000 vs 0x8001. The other candidate is an alternate port because the remote port on the link sends a better BPDU, with an accumulated cost of 0. On the segment between S2 and S3, S2 s port wins: while both bridges have the same accumulated cost to the root (20,000), S2 s bridge identifier is smaller 32768.02:00:00:00:00:01 vs 32768.02:00:00:00:00:02.
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    Root Identifier: 4096.02:00:00:00:00:00
    Root Path Cost: 20000
    Bridge Identifier: 32768.02:00:00:00:00:01
    Port identifier: 0x8002
If you cut the active link between S1 and S3, S3 promotes the best alternate port to root port. If you also disable the second link, S3 chooses the remaining alternate port as a root port. But if you disable the link between S1 and S2, S2 needs a bit more work to elect a new root port because it does not have an alternate port. Unless a specific event happens, designated ports send BPDUs every 2 seconds.9 If a bridge does not receive BPDUs from its neighbor for 3 consecutive hello periods, it considers the neighbor dead and removes the port information.

Port state transition Each port can have one of three states. The diagram displays a background color for each state:
  • discarding (red),
  • learning (yellow), or
  • forwarding (green).
A root port transitions automatically to the forwarding state. An alternate port stays in the discarding state. A designated port has two options to transition from the discarding state to the forwarding state:
  • If the port is an edge port, either through configuration or because the remote device does not speak any flavor of STP, the bridge assumes the device won t participate in the protocol and cannot create a loop. In this case, the designated port immediately transitions to the forwarding state.
  • Otherwise, it sends a proposal to its downstream neighbor. If the remote bridge agrees that the received BPDU is better than any other BPDU stored for other ports, it elects the receiving port as its root port and starts the synchronization process: it transitions all non-edge non-synced designated ports to the discarding state to avoid a loop. Then, it sends back an agreement. Upon receiving the agreement, the peer designated port transitions to the forwarding state.10
:protocol rstp
S1 @1,0 prio=4096 icon= 
S2 @1,1
S3 @0,2
S4 @2,2
S5 @0,3 prio=8192 icon= 
S6 @2,3
H1 @0,1.2   proto=none icon= 
H2 @2,1.2   proto=none icon= 
H3 @2.5,1.3 proto=none icon= 
H4 @2.5,2.3 proto=none icon= 
S1 -- S2
S2 -- S3
S2 -- S4
S3 -- S5
S4 -- S6
S4 -- S3
S5 -- S6
S3 -- H1 S3:edge
S4 -- H2 S4:edge
S4 -- H3 S4:edge
S6 -- H4 S6:edge
In the topology above, H1, H2, H3, and H4 are end devices not participating in the protocol. We configure the ports they connect to as edge ports, so these ports immediately move to the forwarding state. Use the step button to move the simulation forward. The clock moves to 1 second. Step again and S1 and S2 send a proposal to each other. Here is the proposal from S2:
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x4e, Agreement, Port Role: Designated, Proposal
        0... .... = Topology Change Acknowledgment: No
        .1.. .... = Agreement: Yes
        ..0. .... = Forwarding: No
        ...0 .... = Learning: No
        .... 11.. = Port Role: Designated (3)
        .... ..1. = Proposal: Yes
        .... ...0 = Topology Change: No
    Root Identifier: 32768.02:00:00:00:00:01
    Root Path Cost: 0
    Bridge Identifier: 32768.02:00:00:00:00:01
    Port identifier: 0x8001
S1 ignores it: its own root identifier is lower. When S2 receives a similar proposal from S1, it accepts S1 as its root bridge. It also elects the port to S1 as the root port and starts the synchronization process. The two designated ports are already discarding, so no change here. Step again and S2 sends two BPDUs to S1. In one of them, the agreement bit is 1 and the proposal bit is 0. It also shows that S2 accepted S1 as the root bridge and its root port is now in the forwarding state. When receiving this BPDU, S1 transitions its own designated port to the forwarding state. From this point, the link between S1 and S2 forwards user traffic.
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x79, Agreement, Forwarding, Learning, Port Role: Root, Topology Change
        0... .... = Topology Change Acknowledgment: No
        .1.. .... = Agreement: Yes
        ..1. .... = Forwarding: Yes
        ...1 .... = Learning: Yes
        .... 10.. = Port Role: Root (2)
        .... ..0. = Proposal: No
        .... ...1 = Topology Change: Yes
    Root Identifier: 4096.02:00:00:00:00:00
    Root Path Cost: 20000
    Bridge Identifier: 32768.02:00:00:00:00:01
    Port identifier: 0x8001
Let s look at what happened to S5. Reset the simulation and step twice. S5 exchanges BPDUs with both S3 and S6. Since S5 has a lower root identifier than S3 and S6, it stays the root bridge, while S3 and S6 accept the proposal and elect their root ports. S3 and S6 start the synchronization process. S6 s port to H4 keeps forwarding because it is an edge port. Move one step. Both S3 and S6 send an agreement back to S5, which transitions both designated ports to the forwarding state. Yet, the link between S5 and S3 keeps discarding user traffic! If you look carefully, S3 s port toward S5 is now a designated port, not a root port. During the same step, S3 also receives a better BPDU from S2 with S1 as the root bridge. It elects its port to S2 as the root port and downgrades the port to S5 to a designated port, which stays in the discarding state. On the next step, things get a bit tricky. S3 sends a proposal to S5:11
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x4f, Agreement, Port Role: Designated, Proposal, Topology Change
        0... .... = Topology Change Acknowledgment: No
        .1.. .... = Agreement: Yes
        ..0. .... = Forwarding: No
        ...0 .... = Learning: No
        .... 11.. = Port Role: Designated (3)
        .... ..1. = Proposal: Yes
        .... ...1 = Topology Change: Yes
    Root Identifier: 4096.02:00:00:00:00:00
    Root Path Cost: 40000
    Bridge Identifier: 32768.02:00:00:00:00:02
    Port identifier: 0x8002
S5 elects S1 as its root bridge and the port toward S3 as its root port. It starts its synchronization process, but the designated port to S6 does not move into the discarding state. Why? That port stays a designated port and its neighbor S6 has already sent an agreement on the link, so the port keeps its synced status. Now, let s step back to look at what happens to S6. At this point, S6 believes S5 is the root bridge. Step once and S4 sends a new proposal to S6. S6 accepts the proposal, elects S1 as the root bridge and the port to S4 as its root port. The role of the port facing S5 changes: from a root port, it becomes a designated port. Because its peer keeps advertising an inferior BPDU on the link, this port becomes disputed and moves to the discarding state. The root port transitions to the forwarding state and the link starts forwarding immediately because S4 s designated port is already in the forwarding state. If we step one more time, S5 and S6 exchange two BPDUs. The one from S5 is better because of its lower bridge identifier. S5 s port stays a designated port, while S6 downgrades its own port to an alternate port. Let s rewind to the start one last time: cut the link between S1 and S2, run the simulation until the topology is stable, stop the simulation, and restore the link between S1 and S2. During the first step, S1 and S2 exchange proposals. S2 elects S1 as the root bridge instead of S5 and the port to S1 as the root port. It downgrades the previous root port to a designated port and moves it into the discarding state. The other designated port stays synced and keeps its forwarding state. At the next step, S2 sends an agreement to S1 and the link between them starts forwarding user traffic. It also sends a proposal to S3, but not to S4. Instead, it sends a regular BPDU to S4. S4 still elects S1 as its root bridge and the port to S2 as its root port. It demotes its previous root port, the one to S3, to a designated port, which transitions to the discarding state because of the root port change. The other alternate port, to S6, also becomes a designated port and stays in the discarding state. The new root port moves to the forwarding state. On the next step, S4 s port to S3 settles as an alternate port after receiving a better BPDU from S3. RSTP is a giant state machine split into smaller ones: bridge detection, port information, port protocol migration, port role selection, port role transitions, port receive, port state transitions, port timers, port transmit, and topology change. Some of them are per bridge, some per port. Each bridge runs an instance. Time, operational port state changes, and the BPDUs it receives from other instances drive the transitions. Being event-driven makes RSTP more efficient but also more difficult to understand.
Western Australian Government Railways class Msa Garratt articulated steam locomotive: elevation and plan drawing
Placeholder for the Port Information state machine extracted from IEEE 802.1Q-2005, page 182. Pending IEEE authorization for reproduction, this is the blueprint for the Western Australian Government Railways class Msa Garratt articulated steam locomotive.

Topology change notification A bridge populates a MAC address table: it associates each source MAC address with the port that last received it. When forwarding an Ethernet frame, it looks up this table to choose the right port.12 When a link fails, a connected fridge reachable through one port may become reachable through another one. The affected bridges should flush the MAC addresses they learned, because these entries may now be wrong. For this purpose, RSTP implements topology change notifications using a flooding mechanism. When a non-edge port transitions to the forwarding state, a bridge generates BPDUs with the topology change (TC) bit set. It sends them to all the non-edge designated ports and to the root port. It also flushes the MAC address table on these ports. When a bridge receives such a BPDU, it propagates the notification to all non-edge designated ports and the root port, except the one the notification came from. It also flushes the MAC address table on these ports. In the examples, the BPDUs with the TC bit set to 1 have a red circle.
:protocol rstp
S1 @1,0 prio=4096 icon= 
S2 @0,1
S3 @1,1
S4 @2,1
S5 @1,2
LPT @0.1,2 proto=none icon= 
S1 -- S2
S1 -- S3
S1 -- S4
S2 -- S3
S2 -- S5
S4 -- S5
S5 -- LPT S5:edge
Start the simulation and wait a few seconds for the topology to settle. Stop the simulation and disable the link between S2 and S5. S5 elects the port facing S4 as the root port, which transitions immediately to the forwarding state. Step once and S5 emits a BPDU with the TC bit set to 1:
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x79, Agreement, Forwarding, Learning, Port Role: Root, Topology Change
        0... .... = Topology Change Acknowledgment: No
        .1.. .... = Agreement: Yes
        ..1. .... = Forwarding: Yes
        ...1 .... = Learning: Yes
        .... 10.. = Port Role: Root (2)
        .... ..0. = Proposal: No
        .... ...1 = Topology Change: Yes
    Root Identifier: 4096.02:00:00:00:00:00
    Root Path Cost: 40000
    Bridge Identifier: 32768.02:00:00:00:00:04
    Port identifier: 0x8002
S4 receives this BPDU. It flushes the MAC address table on the port facing S1: while LPT was previously reachable through this port, it is now reachable through S5. Step once. S4 sends S1 a BPDU with the TC bit set to 1. When S1 receives this BPDU, it flushes the MAC address table on the ports facing S2 and S3. Step once and S1 sends a notification to S2 and S3. Step once again and S2 sends a notification to S3, while S3 does nothing because the port toward S2 is an alternate port. S3 does not flush any MAC address table: LPT is still reachable through its port to S1. If you step a bit more, you will see that some of the periodic BPDUs keep the TC bit set to 1. Each port runs a timer equal to the hello timer plus one second.13 The timer starts when the port emits a notification. Until it expires, the port sets the TC bit to 1 in every BPDU it sends. You can also see some periodic BPDUs without the TC bit: they originate from a port that only received a notification and therefore did not arm its timer.

Security RSTP is weak against configuration errors and malicious actors. A bridge not talking RSTP can create a loop. An attacker can insert themselves into the topology to disrupt the service, spy on the traffic, or alter it. To mitigate such problems, you need to identify the edge ports. An edge port connects to an end device, like a PC or a printer. Such devices do not generate BPDUs and cannot create a loop. RSTP defines two related flags:
  • When true, AdminEdge initializes a port as an edge port. It defaults to false.
  • When true, AutoEdge lets a port become an edge port when it does not receive BPDUs for 3 seconds. It defaults to true.
If an edge port receives a BPDU, regardless of the values of these two flags, it reverts to a non-edge port.
R0 @1.5,1.5 prio=8192
# AutoEdge=true, AdminEdge=false, bridge
S1 @3,1.58
R0 -- S1
# AutoEdge=true, AdminEdge=false, end device
H1 @2.84,2.18 icon=  proto=none
R0 -- H1
# AutoEdge=true, AdminEdge=true, bridge
S2 @2.18,2.84
R0 -- S2 R0:edge
# AutoEdge=true, AdminEdge=true, end device
H2 @1.58,3 icon=  proto=none
R0 -- H2 R0:edge
# AutoEdge=false, AdminEdge=true, bridge
S3 @0.68,2.76
R0 -- S3 R0:edge R0:no-auto-edge
# AutoEdge=false, AdminEdge=true, end device
H3 @0.24,2.32 icon=  proto=none
R0 -- H3 R0:edge R0:no-auto-edge
# AutoEdge=false, AdminEdge=false, bridge
S4 @0,1.42
R0 -- S4 R0:no-auto-edge
# AutoEdge=false, AdminEdge=false, end device
H4 @0.16,0.82 icon=  proto=none
R0 -- H4 R0:no-auto-edge
# Network port, bridge
S5 @0.82,0.16
R0 -- S5 R0:network S5:network
# Network port, end device
H5 @1.42,0 icon=  proto=none
R0 -- H5 R0:network
# AdminEdge=true, bpdu-guard=true, bridge
S6 @2.32,0.24
R0 -- S6 R0:bpdu-guard R0:edge
# AdminEdge=true, bpdu-guard=true, end device
H6 @2.76,0.68 icon=  proto=none
R0 -- H6 R0:bpdu-guard R0:edge
In the topology above, S1, S2, S3, S4, S5, and S6 act as bridges, while H1, H2, H3, H4, H5, and H6 act as end devices:
  • S1 and H1 are on a port without a specific configuration: AutoEdge is true, AdminEdge is false,
  • S2 and H2 are on a port where AdminEdge is true,
  • S3 and H3 are on a port where AutoEdge is false and AdminEdge is true,
  • S4 and H4 are on a port where AutoEdge is false.
If you start the simulation and wait about 20 seconds, links to S1, S2, S3, S4, H1, H2, H3, and H4 eventually forward user traffic: none of the flags matter. But what about the two remaining pairs? S5 and H5 connect to a network port. Such a port enables a non-standard feature: bridge assurance. The port transmits BPDUs regardless of its role. If it does not receive BPDUs for 3 consecutive hello periods, it transitions to the discarding state. On the link between R0 and S5, you can see BPDUs traveling in both directions, unlike the other links, where only designated ports send BPDUs. S6 and H6 connect to a port where AdminEdge is true and BPDU guard is enabled. This is another non-standard feature that shuts down a port if it receives a BPDU. In summary, if you expect a port to be an edge port, you should set AdminEdge to true and enable BPDU guard. Otherwise, declare it as a network port.

Why RSTP today? A compelling use case for RSTP today is an out-of-band network for a datacenter, since you can tolerate an outage of a few seconds. The configuration is minimal and you can use cheap switches, like a Cisco 2960X.14 You need two switches acting as root bridges, and you build several loops to connect OOB switches in each cabinet. This simple design survives one failure on each loop.15
:protocol rstp
:tx-hold 10
# Root bridges
R1 @0,1 prio=0
R2 @0,2 prio=4096
R1 -- R2 cost=200 R1:network R2:network
R1 -- R2 cost=200 R1:network R2:network
# First loop
C1  @1,0 icon= 
C4  @2,0 icon= 
C7  @3,0 icon= 
C10 @4,0 icon= 
C12 @5,0 icon= 
C13 @5,3 icon= 
C15 @4,3 icon= 
C18 @3,3 icon= 
C21 @2,3 icon= 
C24 @1,3 icon= 
R1  -- C1  R1:network C1:network
C1  -- C4  C1:network C4:network
C4  -- C7  C4:network C7:network
C7  -- C10 C7:network C10:network
C10 -- C12 C10:network C12:network
C12 -- C13 C12:network C13:network
C13 -- C15 C13:network C15:network
C15 -- C18 C15:network C18:network
C18 -- C21 C18:network C21:network
C21 -- C24 C21:network C24:network
C24 -- R2  C24:network R2:network
# Second loop
C2  @1,0.5 icon= 
C5  @2,0.5 icon= 
C8  @3,0.5 icon= 
C11 @4,0.5 icon= 
C14 @4,2.5 icon= 
C17 @3,2.5 icon= 
C20 @2,2.5 icon= 
C23 @1,2.5 icon= 
R1  -- C2  R1:network C2:network
C2  -- C5  C2:network C5:network
C5  -- C8  C5:network C8:network
C8  -- C11 C8:network C11:network
C11 -- C14 C11:network C14:network
C14 -- C17 C14:network C17:network
C17 -- C20 C17:network C20:network
C20 -- C23 C20:network C23:network
C23 -- R2  C23:network R2:network
# Third loop
C3  @1,1 icon= 
C6  @2,1 icon= 
C9  @3,1 icon= 
C16 @3,2 icon= 
C19 @2,2 icon= 
C22 @1,2 icon= 
R1  -- C3  R1:network C3:network
C3  -- C6  C3:network C6:network
C6  -- C9  C6:network C9:network
C9  -- C16 C9:network C16:network
C16 -- C19 C16:network C19:network
C19 -- C22 C19:network C22:network
C22 -- R2  C22:network R2:network
This topology converges in about 6 seconds. Each loop should stay small (around 16 bridges) to reduce the probability of a double failure and to avoid sharing too much bandwidth. The design can evolve a bit without adding too much complexity: one VLAN per loop or one bridge domain per loop.

How large can a network be? The maximum age, whose default value is 20, governs the maximum distance of a bridge from the root. The topology below is too big for BPDUs from R1 to reach beyond S20.16
:protocol rstp
:tx-hold 10
:max-age 20
R1 @0,0 prio=4096 icon= 
R2 @0,5 prio=4096 icon= 
S1  @1,0
S2  @2,0
S3  @3,0
S4  @4,0
S5  @5,0
S6  @6,0
S7  @6,1
S8  @5,1
S9  @4,1
S10 @3,1
S11 @2,1
S12 @1,1
S13 @1,2
S14 @2,2
S15 @3,2
S16 @4,2
S17 @5,2
S18 @6,2
S19 @6,3
S20 @5,3
S21 @4,3
S22 @3,3
S23 @2,3
S24 @1,3
S25 @1,4
S26 @2,4
S27 @3,4
S28 @4,4
S29 @5,4
S30 @6,4
S31 @6,5
S32 @5,5
S33 @4,5
S34 @3,5
S35 @2,5
S36 @1,5
R1  -- S1
S1  -- S2
S2  -- S3
S3  -- S4
S4  -- S5
S5  -- S6
S6  -- S7
S7  -- S8
S8  -- S9
S9  -- S10
S10 -- S11
S11 -- S12
S12 -- S13
S13 -- S14
S14 -- S15
S15 -- S16
S16 -- S17
S17 -- S18
S18 -- S19
S19 -- S20
S20 -- S21
S21 -- S22
S22 -- S23
S23 -- S24
S24 -- S25
S25 -- S26
S26 -- S27
S27 -- S28
S28 -- S29
S29 -- S30
S30 -- S31
S31 -- S32
S32 -- S33
S33 -- S34
S34 -- S35
S35 -- S36
S36 -- R2
R1  -- R2 cost=200 down
Once the topology settles, part of the network considers R1 the root, while the other votes for R2. At the boundary, S20 tries to start a synchronization with S21 to move its designated port to the forwarding state. The BPDU looks like this:
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x4e, Agreement, Port Role: Designated, Proposal
    Root Identifier: 4096.02:00:00:00:00:00
    Root Path Cost: 400000
    Bridge Identifier: 32768.02:00:00:00:00:15
    Port identifier: 0x8002
    Message Age: 20
    Max Age: 20
S21 rejects it because the message age equals the maximum age. On the other hand, the BPDU S21 sends to S20 looks like this:
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x7c, Agreement, Forwarding, Learning, Port Role: Designated
    Root Identifier: 4096.02:00:00:00:00:01
    Root Path Cost: 320000
    Bridge Identifier: 32768.02:00:00:00:00:16
    Port identifier: 0x8001
    Message Age: 16
    Max Age: 20
This is not enough to change S20 s root port because S20 has a lower root identifier 4096.02:00:00:00:00:00 vs 4096.02:00:00:00:00:01. Fixing the link between R1 and R2 resolves the issue. The maximum message age any packet carries is now 18, below the configured maximum age. But it only works until another link breaks. A plausible fix is to increase the maximum age to 40.17

How fast is RSTP? RSTP usually converges in a couple of seconds at startup. It often repairs a tree in less than a second. Even the 38-bridge topology takes less than 10 seconds to converge.18 Some topologies can take a bit more time to recover when the root bridge becomes unavailable.19
:protocol rstp
R0 @1,0 prio=0
S1 @1,1 prio=4096
S2 @0,2 prio=8192
S3 @2,2
R0 -- S1
S1 -- S2
S2 -- S3
S3 -- S1
In the topology above, start the simulation, wait for convergence, hit stop, and cut the link between R0 and S1. The topology is already optimal, but RSTP has a hard time converging again. First, S1 loses its root port. It has no more information about R0 and elects itself as the root bridge. It keeps its ports to S2 and S3 as designated ports in the forwarding state. Step once and it sends a BPDU to both S2 and S3 to let them know about the root change. When receiving it, S2 accepts S1 as its root because it does not have a better root on another port. It elects the port to S1 as its root port. The other port stays a designated port. Both ports keep forwarding. When receiving the BPDU from S1, S3 behaves differently: it knows R0 as a better root than S1 through its alternate port to S2. It promotes this port to a root port and demotes the port facing S1 to a designated port, which requires a new agreement. Step once and S3 sends a proposal to S1 with R0 as the root bridge. S1 elects R0 as the root bridge and promotes its port to S3 as a root port. During the same step, S3 also receives a BPDU from S2 stating that S1 is the root bridge. Therefore, S3 has no port left with R0 as the root bridge: it elects S1 as the root bridge and its port to S2 as the root port. Step once and its next BPDU to S1 includes this information: S1 elects itself again as the root bridge. But during the same wave, S1 sends a proposal to S2 with R0 as the root bridge. While S1 and S3 agree that S1 is the root bridge, S2 now believes this is R0! In turn, S2 again convinces S3 that R0 is the root bridge, S3 convinces S1, S1 convinces S2, and S2 convinces S3. This could go on forever, but it does not. The BPDUs saying R0 is root eventually age out when the message age goes past the maximum age. In the example above, at the eleventh second, S2 sends a BPDU to S3 with R0 as root, but S3 drops it because its message age reached the maximum. With some luck, the topology can also converge faster if a port stops transmitting new BPDUs after tripping the transmit hold count, whose default value is 6 per second.

About MSTP MSTP is the VLAN-aware version of RSTP: it runs several instances of RSTP and lets the administrator map each VLAN to a specific instance. For example, you can map VLANs 100 to 200 to a first instance, and 300 to 400 to a second instance. The remaining VLANs map to a special instance named the Internal Spanning Tree (IST). MSTP adds its own complexity, but the gist is that you have several logical topologies acting independently. If you want to dig deeper, have a look at MSTP Tutorial Part I: Inside a Region.

About the interactive examples The interactive examples run MSTPD directly in your browser, compiled to WebAssembly with emscripten. A C API replaces the code talking to the Linux kernel: it manages bridges and ports, exports state as JSON, and drives time deterministically. A JavaScript wrapper makes it more user-friendly:
import   loadMSTPD   from "./dist/mstpd.mjs";
const mstp = await loadMSTPD();
// Create 3 bridges
const a = mstp.createBridge("A",   priority: 4096  );
const b = mstp.createBridge("B",   priority: 8192  );
const c = mstp.createBridge("C");
// Each bridge has two ports
const a1 = a.addPort("a-b",   portno: 1  );
const a2 = a.addPort("a-c",   portno: 2  );
const b1 = b.addPort("b-a",   portno: 1  );
const b2 = b.addPort("b-c",   portno: 2  );
const c1 = c.addPort("c-a",   portno: 1  );
const c2 = c.addPort("c-b",   portno: 2  );
// Build a triangle topology
mstp.link(a1, b1);
mstp.link(a2, c1);
mstp.link(b2, c2);
// Enable all bridges and ports
for (const br of [a, b, c]) br.enable();
for (const p of [a1, a2, b1, b2, c1, c2]) p.enable();
// Execute 40 seconds' worth of wall clock and display the topology
mstp.step(40);
console.log("Topology:", mstp.topology());
Several dozen unit tests explore the features of MSTPD and check that they work correctly in this environment:
$ node --test *.test.mjs
  two bridges: lower priority becomes root (41.657342ms)
  triangle loop: exactly one port blocks and all agree on the root (5.832ms)
  breaking the active link reconverges and restoring recovers (18.730753ms)
[ ]
  tests 40
  pass 40
  fail 0
[ ]
  duration_ms 396.190897
Additional JavaScript code looks for specific <pre> blocks containing a topology definition and turns them into interactive widgets. You can inspect and modify the definition by hitting the edit button. There is also a cool trick to tell whether the topology has converged. After each step, we save a snapshot of the simulation memory, play 50 seconds worth of simulation to check if the topology is stable, and travel back in time by restoring that snapshot. The complete code lives on GitHub. I am happy with the result. It can be difficult to follow everything happening during a single step, but stepping forward and backward helps. I plan to use the same approach in future blog posts about networking features.

Note Michael Lynch reviewed a first draft of this article. He authored Refactoring English, a book to sharpen your writing for blog posts, documentation, commit messages, and tutorials. Any errors are still mine!


  1. The sprites for Stan and Blobby come from Craftpix, the coffee cups from Yanin.
  2. STP was introduced in IEEE 802.1D-1990. It is still present in IEEE 802.1D-1998 but was withdrawn in IEEE 802.1D-2004 in favor of RSTP, introduced in IEEE 802.1w-2001. MSTP was introduced in IEEE 802.1s-2002 and merged into IEEE 802.1Q-2003. Both of them are part of IEEE 802.1Q-2022 along with SPB a protocol I had never heard of until writing this article.
  3. From here, I use bridge instead of the more common word switch.
  4. The Linux kernel only runs STP. It delegates the other protocols to user space.
  5. MSTPD implements the state machine from IEEE 802.1Q-2005, but on Linux it runs RSTP only. Linux 5.18 added support for forwarding multiple spanning tree, but MSTPD does not use it yet. See PR #150 for progress on this front.
  6. The priority is a multiple of 4,096: with MSTP, the lower 12 bits of the bridge priority encode the MST instance identifier, leaving only the upper 4 bits for the configured priority.
  7. To inspect the BPDUs crossing a link, select it, click the Download packets button, and open the file with Wireshark.
  8. A backup port only exists if the bridge has several ports on the same collision domain. This should not happen in a switched network.
  9. This is the value of the hello timer. It used to be configurable, but IEEE 802.1Q-2005 pins it to 2. MSTPD does not allow another value.
  10. If the peer port does not receive an agreement after the hello timer elapses or the maximum age if the port has just come up it falls back to the timer-based method for compatibility with STP: it transitions to the learning state, waits again for the hello timer to expire, and transitions to the forwarding state.
  11. As in many proposals, S3 also sets the agreement bit to 1. The proposal bit says I am the designated port on this link and I want to transition to the forwarding state. The agreement bit says I am already in sync with the rest of my bridge on this root information. Both can be true.
  12. If it finds no entry, the bridge duplicates the Ethernet frame on all ports, except the incoming one. The same happens if the destination MAC address is the broadcast one (ff:ff:ff:ff:ff:ff). This behavior bootstraps the learning process.
  13. This timer makes RSTP resistant to packet loss.
  14. You can get them for less than US$100 through a broker. All the ports run PVST+ by default and automatically fall back to plain RSTP.
  15. An alternative would be Ethernet Ring Protection Switching (ERPS) another protocol I had never heard of until researching this article.
  16. If you look closely at what happens at t=2s, you can see that R2 is gaining popularity as root: S17 to S36 believe R2 is the root bridge. S16 does not follow because we hit the maximum age. Later, S17 to S20 reverse their position. I ll let you explore the state of the various bridges to understand the root cause.
  17. When increasing the maximum age to 40, you also need to increase the forward delay to 21 (:forward-delay 21), as the standard enforces this condition: 2 (Forward Delay 1) Max Age. For this specific topology, you could also increase the maximum age to 37 and forward-delay to 20.
  18. The simulation may seem slow, but it does not run in real time. Look at the current timestamp in the upper right corner to know the wall clock, e.g. t=8s. Once the topology stabilizes, the same corner shows the convergence time, e.g. 2s.
  19. Khaled Elmeleegy, Alan Cox, and Eugene Ng formalized this phenomenon in On Count-to-Infinity Induced Forwarding Loops in Ethernet Networks and later in Understanding and Mitigating the Effects of Count to Infinity in Ethernet Networks. They propose a fix that did not find its way into a standard.

David Bremner: Reproducing Org mode configuration

Context Recently I was trying to reproduce a bug with citeproc.el and org-mode in emacs. I thought I could use package-vc-install to install a set of upstream emacs packages at fixed versions, and thereby let citeproc upstream test in the same environment as I have. It turns out that getting emacs to load the non-builtin version of org via package-vc-install did not work because
  • org-mode needs to run make after cloning
  • once package.el was initialized, I always seemed to end up with the built in org-mode (yeah, I realize that isn't an explanation).

Recipe part 1: get org Here you can replace 9.8.7 with any other tagged release
  EMACSHOME=$(mktemp -d)
  git clone https://git.sr.ht/~bzg/org-mode $ EMACSHOME /org
  git -C $ EMACSHOME /org reset --hard release_9.8.7 
  make -C $ EMACSHOME /org autoloads
  emacs -Q --batch -L $ EMACSHOME /org/lisp --eval "(progn (require 'org) (message (org-version)))"
This should print 9.8.7, not the version of built in org-mode.

Recipe part 2: add-on packages Now to test some add-on packages, run
    emacs -Q --init-directory $ EMACSHOME  -L $ EMACSHOME /org/lisp
  (progn
    (require 'org)
    (package-initialize)
    (package-vc-install "https://github.com/emacs-straight/queue")
    (package-vc-install "https://github.com/joostkremers/parsebib" "6.7")
    (package-vc-install "https://github.com/rejeep/f.el" "0.21.0")
    (package-vc-install "https://github.com/magnars/s.el" "1.13.0")
    (package-vc-install "https://github.com/akicho8/string-inflection" "1.0.16")
    (package-vc-install "https://github.com/andras-simonyi/citeproc-el" "0.9.5"))
You can then run your tests in that emacs right away, or restart the environment with
  emacs -Q --init-directory $ EMACSHOME  -L $ EMACSHOME /org/lisp

Freexian Collaborators: Monthly report about Debian Long Term Support, July 2026 (by Santiago Ruano Rinc n)

The Debian LTS Team, funded by Freexian s Debian LTS offering, is pleased to report its activities for July.

Activity summary During the month of July, 23 contributors have been paid to work on Debian LTS (links to individual contributor reports are located below). The team released 52 DLAs fixing 2159 CVEs. In July, the Debian Stable Release Managers published the last point release of Debian 12 ( bookworm ), after which the Debian LTS team took full responsibility of Debian 12. This completes the handover from the Security Team, that took place in June. This also marks the second month in a row where the Debian LTS has been focusing on two simultaneous Debian releases. Other than Debian 12, the team is maintaining Debian 11 ( bullseye ), which will reach the end of its Long Term Support on 31 August 2026. After that date, Freexian will continue the security support under the Extended LTS offer. The team published several notable updates:
  • jq (DLA 4662-1 and DLA 4661-1) prepared by Andreas Henriksson in collaboration with Jochen Sprickerhof, addressing multiple vulnerabilities.
  • Several updates for the different linux supported versions prepared by Ben Hutchings, in collaboration with Emilio Pozuelo Monfort. Other than the regular security advisories: DLA 4664-1, DLA 4665-1, DLA 4671-1, DLA 4688-1, and DLA 4700-1, Ben started preparing packages of 6.12 via bookworm-backports.
  • nginx (DLA 4667-1), updated for bookworm by Carlos Henrique Lima Melara, as a follow up of the bullseye update (DLA 4660-1), that was prepared in June.
  • grub2/bullseye (DLA 4685-1), prepared by Emilio. Other than addressing several security issues, this DLA was needed for being able to update the shim boot loader.
  • samba (DLA 4692-1), uploaded by Markus Koschany, to fix several security flaws in bullseye, including issues that could yield to remote code execution.
  • imagemagick (DLA 4680-1 and DLA 4696-1), prepared by Bastien Roucari s, addressing several issues that could lead to denial of service, information disclosure or potentially arbitrary code execution in some scenarios.
  • poppler (DLA 4709-1), by Guilhem Moulin, fixing several vulnerabilities.
  • nss (DLA-4694-1), by Jochen, fixing flaws that may result in or denial of service or potentially the execution of arbitrary code.
Contributions from outside the LTS Team: The LTS Team has also contributed with updates to the latest Debian releases:
  • Bastien also proposed two updates for imagemagick. The first one released as DSA 6383-1, and the second as a trixie point update proposal (#1142554).
  • python-httplib2 by Emmanuel Arias, and released by the security team as DSA 6441-1 in August.
  • hplip (DSA 6402-1), prepared by Thorsten Alteholz, to address privilege escalation and arbitrary code execution related flaws.
  • libnfs trixie update (#1142351), by Thorsten
  • patool update for trixie #1141607, by Abhijith PA
Other contributions: Besides the work on security updates, different documentation and tooling changes were needed, especially in the context of the Debian 12 handover. This work was mainly done by Sylvain Beucler.

Individual Debian LTS contributor reports

Thanks to our sponsors Sponsors that joined recently are in bold.

23 August 2026

Sergio Cipriano: Two Debian Days in one week

Two Debian Days in one week The Debian Project was officially founded by Ian Murdock on August 16, 1993. The Debian community celebrates its birthday, Debian Day, on or around this date every year. This year, I had the chance to attend two of them: one in Jo o Pessoa, Para ba, and another in Bras lia, the capital of Brazil.

Jo o Pessoa Debian Day Jo o Pessoa Group Photo In Jo o Pessoa, we had a two-day event. The first day was dedicated entirely to workshops, and I ran a packaging workshop for newcomers. It was the first time I had been responsible for a workshop, and it was a great experience. We didn't have a lot of time, so I decided to start with a 30-minute talk explaining a few things about Debian. For example, I made this image to explain the packaging workflow: Debian upload workflow This image was based on The Debian Administrator's Handbook, and I think the participants really enjoyed learning about this workflow. When I showed the slide with this image, it was the moment when I received the most questions. After the talk, I explained my way of working and what they were going to do. The hardest part was setting up the environment, since my approach uses sbuild + gbp. They were running different Debian releases and, because of my inexperience with workshops, I had some of them configure sbuild with unshare, even though it is only available in stable through backports. Some of them even managed to learn how to use backports, while others decided to start again using the "old" way. One thing that helped a lot was the Debian Brasil Wiki. It has all the instructions for configuring sbuild in Portuguese, along with great examples. The Brazilian wiki is an opinionated version of the Debian Wiki. We generally prefer to use it for the convenience of having the exact workflow we follow, as well as an up-to-date Portuguese version of our process. If you want to learn more about the Brazilian community, you can find more details in the schedules from previous DebConfs. We almost always had a talk about the community and its activities. In the end, everyone successfully set up their development environment, and all six participants made their first contribution to Debian. If you take a look at my upload tracking page, you will see that every upload made on August 15, 2026 was a sponsored upload from this event. One of them appear twice in the list because I sponsored the upload and also made some other changes. I also asked all of them to put this in their changelog:
* My first contribution!
The idea was to make it clear to other people that they were only working on small Lintian issues as a way of learning and understanding the process. By the way, I made a UDD query to find packages with the following Lintian tag: redundant-rules-requires-root-no-field. To fix this issue, they only had to remove one line from the debian/control file. It is obvious that these uploads are not particularly useful. I call them "motivational uploads" because my goal is to help newcomers understand the process and immediately give them the reward of having made a contribution to Debian. I'll try to keep in touch with them. My plan is to hold another session, this time remotetly, to help them continue contributing to Debian. In fact, I already have another package prepared by one of them waiting for my review. The second day was a full-day event featuring a bunch of talks from the local community. I gave a talk explaining the new members process. I was the only Debian Developer at the event, and I think having a DD there made a real difference. Being there to answer questions, and simply being present, makes Debian feel more tangible and accessible to people. A big shout-out to Rafael Rocha, who put in a lot of work to make this event happen, with the help of many volunteers who contributed along the way.

Bras lia Debian Day talk in Bras lia One thing I really like about Debian Days is that each place has its own way of doing things. In Jo o Pessoa, we had a MiniDebConf-like event, while in Bras lia, we had something smaller but still very valuable. We decided to keep things simple: talk to a few students at the University of Bras lia (UnB) and then go somewhere to eat and have a few drinks.

A bit of history For those who don't know, the DebConf 19 was held in Curitiba, Brazil. After the event, Arthur Diniz got really excited about Debian and decided to go back to his University, UnB, to share his experience and encourage more people to contribute to Debian. I attended one of his talks, thanks to Joenio Costa, who invited Arthur to give the talk. Joenio was also my professor at the time and a Debian contributor. I really liked what Arthur had to say about free software, and he did a great job of presenting the Debian community as a friendly and welcoming place. So I decided to attend local meetings of the Debian Bras lia community, which had been inactive for a long time. Lucas Kanashiro was the Debian Developer who answered our questions and, as I mentioned earlier, simply being there made Debian feel more tangible. Everything stopped when the pandemic began. Then, towards the end of 2020, I saw a message in the Debian Bras lia channel saying that the meetings were back, this time remotely. I was hesitant to join because, back in 2019, I hadn't managed to make a packaging contribution, even with their help. I had eventually given up on the process. So this time, I decided to join the meeting with something already prepared for review. I watched all of Eriberto's packaging videos, picked a random package, and joined the meeting. I remember Kanashiro being excited that someone had just shown up with something ready for review. At the time, it was only the second meeting since Debian Bras lia had come back online, and none of the newcomers had started working on contributions yet. During the same meeting, he also convinced us, the newcomers, to give a talk about Debian just three days later. The MiniDebConf Online Brazil 2020 was happening on Sunday, and the meeting was on the Thursday before it. Since he has great convincing skills, I went along with the idea and prepared the talk with Francisco Ferreira. That was the rebirth of the Debian Bras lia community. Since then, we have maintained a close connection with the University of Bras lia, and today, at least seven Debian Developers are from UnB, whether as former students or former professors. The reason I told this story is that, even though the Debian Day we held in Bras lia was smaller, it is part of something that has been working for us for several years: staying close to an University. We've managed to attract and retain many people who share the same values and interests. I've hope you all had a great Debian Day. If you're reading this and aren't part of the Debian community but would like to join, get in touch!

Colin Watson: GSS-API support split out from main Debian OpenSSH packages

In an option review I did in 2024, shortly after the xz-utils backdoor, I explained that having GSS-API authentication and key exchange support in the main OpenSSH packages is problematic. The key exchange patch is large and intrusive. Furthermore, even linking to the necessary libraries is not without risk: as the Ebury malware attack demonstrated way back in 2009, each extra library linked into security-critical daemons such as sshd (or nowadays into its privilege-separated helper programs) can modify the behaviour of the daemon even if you aren t doing anything that would involve calling into that library. Of course some of that risk remains, but as Damien Miller wrote, minimizing the number of libraries that end up in the address space of sshd and friends is still valuable. I just uploaded openssh 1:10.4p1-5 to unstable, completing this split. As of this version, the OpenSSH client and server are built without GSS-API authentication and key exchange support. If you need those features, install openssh-client-gssapi or openssh-server-gssapi instead, as appropriate. Debian 13 (trixie) already has packages with those names that just depend on the regular openssh-client and openssh-server so that you can pre-emptively install them, as documented in the release notes. The new openssh-*-gssapi packages have relatively tight dependencies on openssh-common, in order for the testing migration system to ensure that we can t forget to keep them up to date. This will mean a bit more ongoing work for me on each new upstream version, but I think it will be manageable.

22 August 2026

Aigars Mahinovs: Optimistic take on AI

As I am writing this, there is a vote ongoing in the Debian project on how to deal with AI in general and AI-assisted contributions to Debian specifically. Massive discussions have happened in debian-vote and other locations. I have also asked questions there and offered my perspective. IMHO now is the time to summarize that, after all the discussions that I've had with people on multiple sides of this debate both online and offline, and explain how I will be voting and why. Hopefully that will be helpful to someone else as well. None of this has been compiled with AI assistance, but only because I think that forming opinions is not something where AI can really be helpful. Spellcheck was used though. So, first I will describe how I see each of the 8 proposals, then what my vote will be, and then a bit more detail on the reasoning and thinking behind this. WARNING - this went long. With all the above considered I will vote like this (earlier options are preferred over later options): Details on rationale Hypocrisy - I find any proposal that would ban AI-assisted contributions to Debian, but at the same time not ban including AI-assisted contributions from upstream projects to be inherently hypocritical. If LLMs and AI are the very incarnation of evil (a puppy-killing machine, as the analogy went in some emails), then any rational proposal would involve excluding any and ALL code contaminated by this evil from the project. What does it matter if puppies were killed in writing the debian subfolder of the source code or the src subfolder? No proposals went there because everyone knows that such a ban would be the death of the relevance of the project for the future. Debian would be frozen on some old version of the Linux kernel forever and other software would be falling to the same problem too, for example as projects on GitHub start enabling AI-supported reviews with patch suggestions. Soon the "development" of Debian could just be stopped as there is nothing to develop without any upstreams. Assumptions - a lot of proposals mention various "concerns" with at most one word, like "practical" or "community" without an explanation of what exactly they mean by that. The proposers assumed that everyone lives in the same info bubble as they do and already know everything that they mean and already agree to that. That is false. Proposal A was a positive stand-out in this area. Debian has contributors all over the world with very different exposure to different information sources and very different world views. If you want to convince the project as a whole that LLMs are bad because of "ethics", then you do really need to explain what you mean by that and give links to sources, at least as well as Proposal A did. All other proposals were really weak in this area. Copyright - the question on how copyright law interacts with training LLMs and their outputs is still not settled law. The closest legal statements we have so far are that - just because an LLM is trained on copyrighted material does not make that LLM itself be a derivative work of the training data (you, however, cannot just create and distribute a "library" of copyrighted materials just because you plan to train LLMs on it). The output of the LLM might not be subject to copyright law at all, like a photo taken by a monkey. It would then be public domain and thus can be modified and then licensed by the user of the LLM. It might also be a derived work of the context of the inference (so for software - if you refactor a GPL project, the refactoring itself is likely GPL too). Any stricter interpretations would break a lot of existing copyright doctrine, such as raising questions like: "does the output of any programmer now become a derived work of the programming manual books they read in college?". In any case it is really not up to Debian to legislate the nuances of copyright law. And I strongly disagree with the concept that an author can tell me how I am allowed to use the learnings that I gained by reading their work. That is not how either copyright or society works. I can look at 10 pictures of a sunset and draw my own, inspired by the ones I saw. No one can forbid me that expression. The same must be true for a machine learning and replicating patterns. Ethics - I've re-read all proposals and emails and the only real specifically ethical concern I could find was the complaint that some LLMs (or their training farms) are running their web scrapers too aggressively and that causes extra load on services. Like that is not an LLM problem. Scraping the web is not an inherent part of the LLM training or inference process. It's just a few misconfigured scripts. We saw the exact same thing in the early days of web search engine proliferation. Then we banned/blocked the misconfigured engines and the survivors learned that obeying robots.txt is one of the rules for surviving. Literally the exact same problem and it will be solved the same way. Did we ban all search engines back then just because some of them were misconfigured? No. Some claims (like in Proposal C) are just bombastic hyperbole ("hazards to users' mental health", "fraud", ...) and on top of that have zero relevance to the topic at hand - AI-assisted contributions to Debian. What "hazard to users' mental health" is created when a Coderabbit spots that a lock is not taken before accessing a resource in a particular function and suggests an AI-generated patch to fix it? What "fraud" is committed by this? There is no sane answer. I get that some people are very busy fighting some culture wars and sometimes, some AI-bros happen to be on the other side of one such war, so it is useful to label everything coming from the AI sphere as "bad" in all possible and impossible ways. You do you. In private. Why pull Debian into that? Why force your position on everyone else in the project? Why deny everyone in the project access to useful tooling, just because you have strong feelings about some of the people promoting some of those tools? This seems to me a repeating pattern here - blaming the technology as a whole or blaming all providers of this type of technology for failings (ethical or technical) of some of those providers. Like refusing to wear all shoes and condemning all shoemakers and sellers, just because some American billionaires figured out a way to make and sell cheap shoes by killing puppies. Not refusing and condemning those providers, but condemning all for the actions of a few. Resource usage - this is a big topic for many and it has reasonable points to it. The LLM and AI technology has no inherent need to be damaging to the environment in any way for it to function. It does not need to burn oil or dig up cobalt. It does not need to sacrifice a ton of water to the Gods. It is perfectly possible to run AI (both inference and training) purely from green, electrical energy and cool data centers in equally sustainable ways, like with simple air-source heat pumps (also known as air conditioning) or even use it beneficially (many data centers are used for heating surrounding buildings via district heating). However, some AI companies do use non-green power for their data centers, some do use locally-limited fresh water for evaporative cooling (evaporated water still rains down as rain, it is not really lost, but that may happen in another location so lack of water can still happen locally). Some even run unlicensed natural gas turbines in their data centers to provide them with power. And those specific providers can and should be shunned and condemned. Not the other ones, who are doing the right things. Not the technology or its users or its outputs. There is a very wide spectrum of options on how an AI system could be powered: starting from local execution on already existing private hardware powered by one's own local solar power (good), to a data center stuffed with borrowed AI-only cards powered by a gas turbine or coal power station that operates solely to supply this data center (bad). Proposals that talk about ecological impact, but do not even consider where on that (very wide) spectrum to draw the line between "good", "acceptable", "discouraged" and "bad" well, I cannot see those proposals being actually serious about the environment to begin with. It feels like they just refer to it for points. And if we go into the power question deeper, well the grid dynamics and economics become very, very complex and often also non-intuitive. Like, all large software companies with data centers (that also happen to provide AI services), like Google, Meta, Apple, Microsoft and others do actually care about sustainability (in part because their customers care and vote with their wallets) and so all of them use 100% green energy for their data centers (including AI data centers) .... "on an annual scale". Wait, what does that mean? Well, the electrical grid is special - the amount of electricity produced and consumed on the whole electrical grid together has to match almost exactly every second. If there is just a single second where there is significantly more energy consumed from the grid than is produced, the frequency will plummet and you get a brownout and risk a grid collapse. The same is true in reverse - that causes a voltage swell. So grid operators manage energy flows every second and command power stations to increase and decrease generation all the time. Some power stations are easier to regulate dynamically than others. In the end, all that means is that even if your data center has a contract for 100% green energy with your power company, at some seconds across the year there might not be enough green energy in the grid to fully supply ALL people and companies that have 100% green energy contracts. This gets compensated in other seconds, so that across the year ("on an annual scale") for each kWh that your data center pulled from the grid, the same amount of kWh of 100% green energy flows into the grid. But it might not happen at the exact same second. Pedantic companies, like Google, take that discrepancy and count that as CO2 emissions for themselves. And then they and the power companies (they have contracts with) invest billions into new green energy projects, better grids and better batteries so that eventually this discrepancy goes down to zero. In this way green AI data centers with their increasing consumption of green energy are actually doing a lot of good work in making our electrical grid more green. They are making more resources than they are consuming. And that is just the tip of the iceberg. This is a deep topic that really abhors generalizations like "more consumption = bad". I've heard similar discussions in the context of electric cars - "so you got an electric car? you'd have fewer emissions if you drove no car at all!". That might be so. And I would also reduce my emissions to zero if I stopped breathing, but I really do not want that kind of thinking to be propagated further, especially when impressionable young people are around who may take it to its logical (but wrong!) conclusion. Instead I talk about how early adopters use electric cars to gather experience and achieve volume to start the network effects working. Once network effects of many electric cars on the roads are sufficient, it becomes an economically logical choice to get an electric car. People who cannot avoid having a car start to switch over. And at the point of mass switchover the reduction of emissions is so massive that those early adopters failing to go all the way to riding a bicycle becomes a rounding error. But surely that does not apply to LLMs? They are only increasing consumption and bring no benefit? Benefit - and here we have to actually talk about benefits. Because you cannot make any cost-benefit analysis if you do not actually fully investigate the benefits. Are there environmental benefits from running those AI models? Yes, in a lot of very diverse ways. Hard to measure, however. There are projects that are easy to quantify - like that Google AI project on contrail avoidance. An advanced, special model trained and executed in Google AI data centers was able to predict where in the air contrails would be produced and could generate proposed course adjustments to commercial flights to avoid specific heights in specific locations at specific times. This stopped these aircraft from creating contrails and those contrails did not make a further contribution to global warming. That benefit in a year was many times higher than the environmental cost of training and running that AI model. And it can keep running for many years accumulating further benefits. On a personal scale, I've had problems that I bashed my head (and computer and CI resources) against without much success years ago solved with a few minutes of compute. Having a good enough candidate solution quickly is much cheaper from a resource perspective than spending days trying different things, running my PC for it, trying different patches on CI executions, doing different rebuilds. I've seen very significant benefits in AI-assisted development in enterprise environments where code way more complex than what is in Debian (especially in Debian tools and packaging) gets analysed, reviewed, modified or even refactored or rewritten in another language with AI assistance. And it generally works. The commonly mentioned "hallucinations" are a thing of last year in the coding context. Nowadays the AIs work in special coding harnesses and use real tools as foundational facts. You cannot "hallucinate" an API call or parameter if you have to run and pass the unit tests and integration tests by your harness before you can return "success" to the caller. I've personally seen high-level AI models read very complex software projects across multiple repositories and point out a very specific design consideration that was encoded in the code logic, but never mentioned in comments or documentation. It was so obscure that even I did not immediately know what it was talking about (and I wrote that code). Only on close inspection of code interaction across three repos did I remember that there was indeed that bug 2 years ago that I fixed by doing the change that this AI picked up (it wasn't in the history of this git repo due to repo migration). It mentioned this because it was very relevant to the task I initially gave it to review. These LLMs in a proper harness with proper system instructions and usage approach are not just fancy spell checkers or auto-complete. They function more like very advanced pattern matchers. They have learned millions of patterns from training data. When they look at the code, they see hundreds or thousands of overlapping patterns. When you ask them to make or change something, they pull out a pattern (or ten) from their training and apply those patterns to the context of your program. You get something that looks just like the surrounding code, same style choices, same language, same comment voice, but it implements something new there, based on other patterns learned. If you've studied design patterns in your CS class, this will be familiar. But people can learn and remember maybe 20-30 patterns, while an LLM can have a million patterns and can combine them when needed. So it takes a pattern of Python code, pattern of standalone script, pattern of parsing command line parameters, pattern of classes, pattern for background threads, pattern for file tree traversing, pattern for pipes, ... and squishes them together to make a solution for your query. And then tries to debug it with compilation, tests and execution until it works as expected. Even if there is zero LLM development going forward, it will take many years to fully appreciate the benefits we can extract from the already trained models. They don't even have to be retrained - for existing languages they just keep working. For new language variations, like a new Python version, you can feed the changelog into context and they will be able to work with a Python version that they never saw in training. And patterns are mostly abstract, so not really specific to any language - human or programming. This is another big enabler that LLMs have created that we have not really explored yet. LLMs have created really free software. People can actually create software that is perfectly suited just for them and no one else. They don't even have to know how to program and don't even need to speak English. I've seen people writing prompts in their native language and LLMs creating and then adjusting web apps or Android/iPhone apps and deploying them to the user's own phone. It was too buggy to work last year, but this year it is actually very functional for simpler use-cases. And the code looks just fine too - I've seen external contractors in a business setting deliver far worse. If you start with a good initial system prompt, the project will have architecture documentation, use-case documentation, unit tests, integration tests, deployment harness, testing and production deployments, audit logs, monitoring, clear git commits, CI validation on commit, ... Modern AI systems have the capabilty to deliver software freedom to people who are not coders. I really can not overstate the consequences this may have on the world. Community - I find the concerns that new people will be using LLMs so much that they will no longer be understanding the actual code they are contributing a bit regressive. I don't see any significant difference between this and people relying on compilers, on high-level languages or on debhelper. Writing modern debhelper packaging feels more like writing configuration and not writing code. It takes really significant effort to dig down through layers of abstraction to find what actually is being executed in debian/rules. AI does not really make this worse. In fact, I find that AI can make it much easier to understand arcane syntax because you can ask an LLM to explain what is happening in any part of the code and it will do a pretty good job of it, digging down through the layers of abstraction for you. All the pro-AI proposals include the requirement that each human contributor needs to understand and stand behind their AI-assisted contribution and I believe that is a good requirement and also a sufficient requirement. Modern LLMs not only produce clear and concise code, but they are also capable of producing good comments explaining why the code is how it is, good commit messages explaining the change and reason behind it and also making corresponding changes to test suites and documentation. You know - the housekeeping stuff that is often skipped because it slows down the actual feature development, but then its lack becomes a problem for future contributors. Responsible use of AI assistance is a great chance to actually strengthen our community and make our software easier to maintain. That said, I have no qualms about flat-out rejecting contributions that do not make sense. And it does not matter if they are made with or without AI assistance. If the contributor will not explain their patch, it might be they do not understand what their AI produced or it could be that the contribution is deliberately hiding a backdoor being planted. It is also quite common for a contribution of a new feature to be rejected because the author/maintainer does not believe that it is a good fit for the project. Featuritis is a real disease. AI or not. There have always been drive-by contributions to various projects. They will continue to exist. Each of them should be evaluated on its merits - is this feature valuable to our users and is the added complexity (if any) worth the functionality? A lot of security bug reports are "drive-by" contributions as well. And many of them nowadays are discovered, exploited and patched with AI assistance. We could reject them, but that just leaves us holding the bag on the now-known exploits. And the New Maintainer process should be able to figure out if an upcoming Developer has actually understood the nuances of Debian packaging or not. A contributor with upload rights to the archive has to be able to create a basic package with no support tooling (maybe even without using debhelper?) and be able to understand and modify more complex packages (possibly with tooling support). IMHO that is a separate discussion that is worth having, involving experts from the educational sector. Conclusion IMHO the Debian project should not restrict what tooling individual contributors use to contribute. Expecting high-quality contributions and that contributors understand what they are contributing (as a first level of review) is enough. However, Debian should provide its contributors (internal or external) with guidance on how to contribute in the best way possible. That could include: In addition to that it would be helpful for Debian, as a project, to reach out to AI service providers to: Questions? Feedback? Just ask here or here.

Emmanuel Kasper: Create a development VM using Debian cloud images

Following on the rationale of the previous post, here is how I create a development VM based on ready to use disk images made by the debian cloud team. I could as well install the VM myself using an ISO, but why download a collection of packages in a ISO only to copy them right onto a disk image ? From the list of images available at https://cloud.debian.org/images/cloud/ we will start with the generic qcow2 disk image, it has cloud-init, which allows initial automatic configuration, and snapshots of the VM via the qcow2 disk format. As for the virtualization, I am using virsh virt-install and virt-manager, which are part of the libvirt framework. Libvirt offers an excellent API accessible over qemu/KVM via shell (virsh), GUI (virt-manager) and Web (cockpit) . To use libvirt, properly you need to make sure your standard user is member of the libvirt group, and the libvirt default network is started via virsh net-autostart default. Also make sure you set export LIBVIRT_DEFAULT_URI=qemu:///system to use the system wide instance of libvirt, which is needed for the default bridged networking. Download the debian cloud image:
$ wget https://cloud.debian.org/images/cloud/trixie/daily/latest/debian-13-generic-amd64-daily.qcow2
Add the disk image as a libvirt volume:
$ export SIZE=$(stat -Lc%s debian-13-generic-amd64-daily.qcow2)
$ virsh vol-create-as default dev-vm $SIZE --format qcow2
$ virsh vol-upload --pool default dev-vm debian-13-generic-amd64-daily.qcow2
Create a VM with the root password set to root :
$ echo root > password.txt
$ virt-install --name dev-vm --memory 4096 --noreboot \
	--os-variant detect=on,name=linux2024 \
	--disk vol=default/dev-vm \
	--import \
	--boot uefi \
	--cloud-init root-password-file=password.txt,clouduser-ssh-key=$HOME/.ssh/.ssh/id_ed25519,disable=on
At the point libvirt will create a VM (a domain in libvirt parlance) and start it.
Starting install...
Allocating 'virtinst-ns9oa7_i-cloudinit.iso'                  368 kB  00:00     
Transferring 'virtinst-ns9oa7_i-cloudinit.iso'                368 kB  00:00     
Creating domain...                                                    00:00     
Connected to domain 'dev-vm'
BdsDxe: starting Boot0001 "UEFI Misc Device" from PciRoot(0x0)/Pci(0x2,0x3)/Pci(0x0,0x0)
Booting  Debian GNU/Linux'
Loading Linux 6.12.101+deb13-amd64 ...
Loading initial ramdisk ...
EFI stub: Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path
EFI stub: UEFI Secure Boot is enabled.
[    0.000000] Linux version 6.12.101+deb13-amd64 (debian-kernel@lists.debian.org) (x86_64-linux-gnu-gcc-14 (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44) #1 SMP PREEMPT_DYNAMIC Debian 6.12.101-1 (2026-08-05)
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-6.12.101+deb13-amd64 root=PARTUUID=2b4578e2-9d2e-4b32-b6a4-b5b2ca607ef6 ro console=tty0 console=ttyS0,115200 earlyprintk=ttyS0,115200 consoleblank=0
...
Once the VM is created you have now three ways to access it:
# open a serial console to the VM
$ virsh console dev-vm
# access the graphical console
$ virt-manager
# Access the VM via SSH with the precreated cloud user "debian"
$ virsh domifaddr dev-vm
 Name       MAC address          Protocol     Address
-------------------------------------------------------------------------------
 vnet7      52:54:00:23:e6:61    ipv4         192.168.122.225/24
$ ssh debian@192.168.122.225
In the next blog post we will see how to configure the IDE (vscodium) to run confortably in the VM.

21 August 2026

Emmanuel Kasper: Moving software development to separate VM to reduce credential scavenging

Rationale: I was remembered via https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/ (linked from https://anarc.at/blog/2026-08-18-people-vs-ai-overlords/) of the risk of downloading untrusted packages in a dev environment. If you read the blog post above you will see that it is way to easy do have a random npm, or even python package in a dev environment scavenge your long running credentials from your workstation, either on disk, or reading from memory ! I will thus move to the following set up:
  • things running directly in my workstation will require either to come from a trusted source (Debian package that is) or run in a sandboxed infrastructure (Podman rootless is the best thing here, followed by Flatpaks)
  • everything else, will run in a Libvirt VM based on Debian cloud images. For me it will be mostly in the beginning the VSCodium editor, with its myriad of extensions.
I am aware of whole blown solutions like QubeOS however I don t indent to reinstall the whole OS, and QubeOS does not run on ARM64 which is one of the environment I am using. I will try to document this setup in two blog posts, one about the VM creation using Debian Cloud Images, the second one about running a graphical env in the VM with some filesystem passthrough. Stay tuned !

19 August 2026

Sergio Cipriano: My experience at DebConf 2026 in Santa F

My experience at DebConf 2026 in Santa F The Official DebConf26 Group Photo Last month, I attended DebConf 2026 in Santa F , which was my 5th DebConf. As always, it was an amazing experience, and I met a lot of great people there. For those unfamiliar with the event, it takes place over the course of two weeks. The first week is called DebCamp and is geared more towards hacking and organizing the event itself, while also offering a great opportunity to discuss ideas with others. The second week is the DebConf. We still have the hacklabs, but the talks and workshops are the main focus.

My Activities during DebCamp My main activity was working on the python-click transition that I started in May. There were only a few packages left, and with the help of Guilherme Puida, we managed to work through all the remaining bugs. I plan to talk in details about this transition in another blog post, where I will focus on the tools I used and my experience with mass rebuilds and mass bug filing. I also helped with de Golang Sprint. I worked on a few packages and experimented with the dak API to generate a list of packages that needed manual action. There was a lot of manual, repetitive work and false positives, so I eventually moved on to some other, more fun stuff. I also learned a few thinks about kernel live patching while talking to David Tadokoro. I had to work on the Ubuntu Kernel package recently as part of my job, so we exchanged some ideas, and the conversation was really helpful. He also taught me two commands that I wasn't familiar with, since I'm a newbie in kernel development. Here are the commands:
$ b4 am https://lore.kernel.org/lkml/20240730071904.1047-1-sergiosacj@riseup.net/
$ b4 diff *mbox
By the way, this is the first and only patch I have submitted to the Linux Kernel. I worked on it during DebConf 2024, when I attended the workshop Helen Koike runs to help newcomers submit their first patch to the Linux Kernel. Another great interaction was with Marcos Talau. He showed me his remote access setup, which he is using to help students make contributions to Debian without the struggle of setting up the development environment. Another cool thing is that Puida showed me the command:
$ gbp clone vcs-git:typer
After that, I decided to read the gbp manpage because these little details really improve the overall experience. I also had many other amazing interactions. I just decided to write down the ones that I felt made the most sense for this kind of "blog report" post.

My Activities during DebConf I gave a talk about dh-make-vim, a tool I have been working on sporadically. An interesting detail is that one of the video team volunteers for the talk, Piotr, spoke to me about his tool, pypi2deb, which is similar but aimed at the Python ecosystem. There are many tools of this kind in Debian, and they are all interesting pieces of software. I plan to write more about them in the future. I attended several talks and participated in a few BoF sessions, and they were all great. But something that really stood out to me was the workshop on the Debian Installer, led by Alper Nebi Yasak. I didn't know anything about the Debian Installer, and I liked the way he approached the subject and showed the specific details. I'll take some time to read the Debian Installer internals documentation. I was not familiar with udebs or with the fact that the Debian Installer uses debconf under the hood.

Wrap up It was an amazing event. Unfortunatly, a lot of people I know were not able to attend for different reasons, and they were missed. There were many other things that I enjoyed during this trip. Here are a few more highlights:
  • World Cup matches
  • A day trip around Santa F
  • The Cheese & Wine party
  • Empanadas!!

Antoine Beaupr : The people vs the AI overlords

Also in this series:
In a post to oss-security, my (Debian) co-developer Russ Allbery stated that "open source software [OSS] is coming face to face with a motivation crisis that has been building for a long time". His point is essentially that large language models (LLMs1) are making the existing OSS community crisis worse. For him, it's the flood of code reviews, but he argues that varies according to people's desires, for others it's security issues and so on. I think Russ is right, but I would argue there's something much bigger than our open communities going on here, and it's about the entire field of computing. This pressure is on all of us, regardless of whether we work on open source software or not.

How people use models People using LLMs in their workflow have radically changed how programming works, even for people who claim to avoid vibe-coding. And I'm sorry to single out one poor maintainer here: it's not you, Brian, you're just one example among many. But this is typical use of those models nowadays:
Once it s done, I ll use /code-review and let Claude spawn sub-agents to do a full review of the new code. This usually finds some problems, even problems that the main Claude instance didn t find during its validation. I usually keep running /code-review again and again after finding and fixing issues, until there aren t any left.
Think about what that means for a minute. This is automation built to fire up dozens of agents crunching at a problem for minutes if not hours of GPU compute time, in parallel. This is essentially a couple of shelves in a datacenter rack, totally maxed out on power and cooling, abstracted behind a cute little /code-review command. The author, here, is rightly concerned that "Anthropic could pull the rug out and require API pricing", which is perhaps a code word for "charging something closer to actual costs". Brian also pays lip service to environmental and societal costs but those are largely abstracted away, so let's keep that conversation aside here as well, as we have discussed it before anyways. But clearly, this way of working has an (externalized) cost, to say the least.

Paying for non-free tools For decades my work has been focused on free and open source software. I've long stopped using proprietary operating systems like Windows or Mac, and even before that switch, I was mostly using free software on those platforms, partly out of principle, but also because I was too poor. So the tools of my trade are free, and I build free tools with them. It feels like we're going backwards: when I was in school, a millennia ago, my classmates didn't have access to a compiler and were wondering how they would scrape the money to buy a compiler like Borland's or Microsoft's. I had a compiler built into my operating system (FreeBSD at the time), so that wasn't a problem for me. For them, it was a significant expense, but at least those expenses (or more shady sourcing of programs) were a one-shot deal. Fast forward 30 years, and software is rented: you pay monthly for Adobe's Photoshop and Microsoft's office suite just like you pay for Netflix, Disney+ or Spotify2. And now you need to add dozens (if not hundreds of dollars) of monthly credits to access LLMs on top of that. So, now we have to pay to get anything done? This is peak enshitification of our job: first they steal our work to train their models, and then they sell it back to us at a profit.

Attacking the engineers AI is coming for our jobs, as engineers, if not everyone, according to the narrative. For a while now, our job market has deteriorated: less jobs, for less pay. Lots of skilled engineers looking for work and finding crap jobs then still looking while working. This is not by accident.3 We engineers have a lot of power, it is not organized, but that's just a couple of unions away (easy!). Tech overlords know this, so they are attacking our profession, directly, by forcing us to train and use models that they can control. Even in environments where programmers are not forced to use LLMs, the mere pressure of other people's LLM-generated work is huge. One can be forced to review LLM outputs, or just peer pressured you into producing more. We're now supposed to accelerate delivery, because models can presumably do things so much better and faster. With supply chain security becoming such a large vector that we now have worms crawling around developers accounts on NPM, increasing the delivery cadence seems like a really bad idea.4 The LLM hype is part of the larger wave of cyberwar against workers, against water, against the Earth, against all the people. This is not a matter of individually "adapting to the reality" or personal choice, but a political, social, hard problem we need to address collectively.

  1. I again prefer the term LLM to "AI" because models do not possess intelligence. I did use it in the title because click baiting is apparently important, but I stopped short of calling this one "Rage Against the Machines" because that would be the title of every blog post I have ever made.
  2. Yes, I know that Visual Studio is kind of free now, but I wouldn't be surprised if they turn that into a rental as well, because why not.
  3. Beyond sabotaging the job market, Sam Altman event wants to sell "intelligence as a utility" something that is just a really bad idea but especially shows how megalomaniac those people are.
  4. This brings back memories of another era, walking us back decades in terms of computer security.

18 August 2026

John Goerzen: AI in Debian: The Vote, Proposals, and Nuance

Let me start with a hypothesis:
For human developers, using coding LLMs magnifies their difference in skill levels.
I am one that rarely thinks things are always black and white. Back in March, I wrote Artifial Intelligence: Shades of Gray. Since then, I ve had more of a chance to experiment with LLMs myself. I also happen to work for an employer that is taking a very pragmatic approach to LLMs: teams and individuals use it as they see fit, but if they are causing considerable expense, they have to justify it. In various settings, I have seen the egregious examples of AI slop we all know about. As I wrote in March, I have seen it both waste more time than it saves, and save a ton of time. I have come to see that, as a tool, it is most valuable when it is running under the supervision of an experienced engineer. It is at its worst when it has no such supervision; the vibe coding and other low-quality slop we see. A coding agent is like a junior developer or research assistant. When properly supervised, they help projects move along more quickly by letting a senior developer focus on the more difficult, less mundane aspects of the project. But one couldn t expect a junior developer to consistently deliver high-quality code and architecture on their own. Let s put a pin in this idea and look at the story in Debian. LLM use in Debian There is a vote happening in Debian around the use of LLMs. In typical Debian fashion, there are 8 options to choose from, many of them similar. Most of these proposals acknowledge there are different types of tasks done in Debian, but the proposals don t differentiate between them well. Let me do so here. These are some of the LLM-relevant tasks people in Debian perform: I m going to focus my remarks here on packaging upstream software for Debian, since this is by far the most time-consuming developer task project-wide. It matters to our users that we get this right, and packaging quality is one of the things that sets Debian apart from other distros. Packaging things for Debian requires knowledge of some specific tools, such as debhelper, that aren t widely used anywhere else. In most cases, it is fairly rote time-consuming work. In other words, by its design, it requires people with senior-level skills to do grunt work. I can t overstate how massive a burden this grunt work is. I maintain some packages for Go and Rust. By Debian policy, all of those packages dependencies must also exist as Debian packages, and be used to build against. When upstream adopts a newer version of some library, it can unleash cascading dependencies that can take hours to sort out. Worse, the Rust team and the Go team use entirely different ways of managing packages (Go uses one Git repo per package, while Rust has a monorepo with specialized scripts to import Cargo packages and generate Debian ones). On top of that, we can t just modify things like usual; we have to use quilt. And on top of that, I m also a backports maintainer, so all the work (and usually even more) has to be done there also. Now let s pull on that pin from the earlier conversation. This is exactly the kind of scenario that a well-supervised coding LLM is most effective in. I could see a seasoned developer saving hours, maybe even days, by turning over the mundane tasks of managing trees of cascading dependencies over to a coding tool and verifying and directing the process. (Yes, I have been using em-dashes for years; LLMs have copied people like me, not the other way around! This post was not written with any AI assistance.) Actually, this is almost a dream scenario for a coding assistant. The result is time-consuming to formulate but easy to review, which is the opposite of the way these things often go. I can assure you with 100% certainty that humans aren t adding a lot of value in this process. It would be wrong to believe that a human is carefully reading every line of code in dozens of updated or new library packages. The problem set is too big, the time too short, and the code too varied and complex. Coding agents seem to be most effective when there are strong test suites that they can test changes against. Debian builds, especially of modern packages, tend to have this property. Many packages have test suites that are run during build. And, if the package builds in an isolated environment (and especially if its downstream dependencies do also), then there is a decent chance that it s fairly correct. Maybe needing some manual tweaking here and there, but generally a successful build is a reasonable indicator. You can argue that it would make more sense for Debian to just include dependencies in source packages, along with some version information to support security rebuilds, and I d tend to agree with you. But we are where we are. This would be one of the more significant leaps forward in developer productivity, but it complicates things like copyright reviews. Where are LLMs run? What is the environmental impact? Most of the proposals seem to make the assumption that LLMs must always run in some large, hosted datacenter. As I noted in my March article, I have had credible results on even an older GPU running on solar power. That said, it is undeniable that LLMs are fueling a datacenter boom, and this in turn is producing a significant new demand for resources. Most notably for the global scale: electricity, which is sometimes generated using carbon-emitting technologies. Bill McKibben, who has been a leading voice in the fight against climate change since the 1980s, has made some interesting points recently: he s noted that solar power is the fastest kind of generation we can build, and a number of large AI companies are investing heavily in solar, even to the point of fully offsetting new datacenter s needs. On the other hand, he s also noted that some companies are buying inefficient and dirty gas turbines. It is decidedly a mixed bag. The heavy investment in solar can have knock-on positive effects for infrastructure. Obviously, not every picture here is rosy. This analysis doesn t touch on the real land and water use situation, either. On the other hand, if an LLM allows me to do in an hour what I would have done in a day, that s a day of not heating or cooling the work area generally not sustaining a human for the purpose of writing code for Debian. HVAC energy consumption dwarfs my GPU, and I d imagine probably also the slice of LLM energy used. Holistically, I would have to conclude the picture is mixed. It is possible to use LLMs in a pretty green way, and also in a pretty dirty way. Assuming Conditions Never Change A flaw in most of these proposals is they assume that the conditions at this present moment will always hold. In fact, that the conditions at the present moment will not continue is something both AI cheerleaders and AI skeptics agree on. For instance: Ed Zitron has done a ton of research into the financing side of AI, and has concluded that the current model is unsustainable and headed for a significant bubble burst. I m not positioned to personally evaluate those claims, but if that happens, what is the result? Perhaps it is a steeply increasing cost of inference for the frontier models, slower pace of training/evolution for them, etc. In a recent episode of Oxide and Friends, Simon Willison discussed the open weight models that are now available. They have been making remarkable strides in efficiency and capabilities, to the point where $50,000 of hardware can now run high-end open weight models with capabilities that are at least in the same ballpark as the American frontier models. This puts running high-end models locally squarely within reach of universities and small- to medium-sized businesses, with power requirements that can be met with standard commercial solar and wind installations. The lack of nuance in the more restrictive proposals is particularly concerning. Proposal A doesn t allow the use or assitance of LLMs . So it bans my solar-powered GPU. It bans using LLMs to find security issues. It bans all sorts of things that don t seem to be ban-worthy, alongside the things that do. And it codifies it in the very hard-to-change social contract. That proposal, and some like it, seem to imply that all LLM output is bad. I grant you that AI slop is a real and legitimate concern, and many Open Source projects have to deal with it. On the other hand, we have all seen first-hand how the security of the Linux kernel has benefited dramatically from AI analysis. It is certain that black hats are using these tools. If we refuse to use modern security tools, our security will be compromised (and what is the environmental and social impact of THAT?) I find the statement Generative AI is characterized by producing output of a nature that would ordinarily be produced and consumed by humans to be particularly interesting. The same was once said of compilers. The Real Concerns You might think from reading this that I am some AI cheerleader. I m not. I share the ethics of the FLOSS movement, and have for decades. I abhor the power and lack of ethics that many big names in the field are running with at the moment. I ve had to put up Anubis on this blog, for instance. I have personally experienced the effects of AI slop, especially at review time. This is a real problem, though I don t think the more draconian policies are likely to help (the looser you must disclose stand a fighting chance, but I m not sure they would help, either.) Done poorly, AI threatens developer burnout by overwhelming them with poor code and verbose but useless explanations. Done well, AI can help prevent developer burnout by automating tedious and low-value tasks. Shouldn t our goal be that humans submit work to Debian, using tools they prefer, and take responsibility for it? Does it matter if someone uses ed, vim, emacs, or vscode? If they use LSP or just run gcc manually? I d say we benefit from the diversity. Wouldn t we be better off to benefit from the diversity here, and judge work as we always have: on its merits, not what tools were used to create it? Fundamentally, a GR is a long and arduous process. It s not easy to reverse later. Amending the Social Contract is even longer and more arduous (I should know; I may have been the first one to try). The LLM landscape is fast-moving. None of us can really predict where it will be in a year. Will the current market leading companies even still exist? Will it be at all credible to refuse to use AI-assisted security tools? What is the most effective way to deal with AI slop? What level of utility will we be able to achieve with models run locally? Some of these proposals would make sense if drafted in some way short of a GR, which would allow more maneuverability as the landscape changes. Brief analysis of the options Considering the proposals: In favor of nuance I find that black-and-white thinking is almost always something to be avoided. I see it too often. I see it in politics, I see it in our software, I see it in discussions around AI. Are there deeply unethical things happening in AI? Absolutely. Are they doing some impressive things? Also yes. We have accepted this nuance in other areas. For instance, almost all the hardware Debian runs on has closed-source hardware, and has components manufactured or assembled in countries with some of the worst human rights records on the planet. I m not saying this is a great state of affairs. It is something we should speak up about and act upon. But the worse state of affairs would be no Debian because the hardware is impure .

16 August 2026

Vasudev Kamath: Releasing debvulns-exporter and debvulns CLI 0.2.2

I made another minor release with several enhancements: handling non-Debian origin vulnerabilities, improving data caching, and sharing the cache between the debvulns CLI and the exporter. Additionally, there are a few improvements on the dashboard front. Here is a breakdown of what changed.
Handling Vulnerabilities in Non-Debian Origin Packages During the previous release, I noticed that the grafana package which is not in Debian and was installed via an upstream repository was reported as vulnerable with multiple issues. Looking into why this happened, I found that all the CVEs reported in the dashboard were indeed listed on security-tracker.debian.org, but without a fixed version or status description. The logic assumed no fix was available and marked the package as vulnerable on the dashboard.
How Did I Solve This? Google maintains a distributed vulnerability database for open-source projects called osv.dev. I checked the generic vulnerability data for those CVEs on OSV (unbound to any specific distribution) and found that the issues were already fixed in the upstream version I was running. What I needed was a way to differentiate native Debian packages from non-Debian packages, which corresponds to the Origin field in APT metadata.
Pitfall The AI-generated code initially attempted to differentiate package origin using apt_pkg.PackageRecords and its origin field. However, many native Debian packages were incorrectly flagged as non-Debian. On closer inspection, when an upgrade is available for a package, the installed version's origin field can be unset. I had to resolve this by detecting available upgrades and inspecting the candidate version's origin instead, which was implemented in this patch. This solution was proudly crafted by me ;-) (partly because I ran out of API limits and had to wait 6 hours for the next reset).
Caching OSV Data Initially, the AI implemented the exporter to re-download the entire OSV dataset on every run, which was unnecessary. Since vulnerability data does not change rapidly once published, caching it on disk for longer than the standard 24-hour Debian/EPSS cache makes sense. OSV vulnerability data is now cached for 7 days before a refresh is triggered. All cache expiration thresholds remain configurable via CLI flags.
Catch One caveat with this approach: I have not yet verified whether every upstream CVE is tracked on security-tracker.debian.org. In the case of grafana, the entries existed. This feature operates on the assumption that security-tracker.debian.org indexes CVE metadata regardless of whether the package is native to Debian. I plan to re-evaluate this and add fallback handling if that assumption fails.
Unified Cache Directory for CLI and Exporter Another issue was cache segregation: the debvulns CLI utility defaulted to /var/cache/debvulns, while the Prometheus exporter used /var/cache/debvulns-exporter. While harmless when running only one tool, installing both led to duplicated cache storage and redundant network requests. Since the core evaluation logic is identical across both tools, they now share a unified cache directory to eliminate duplicate downloads.
Dashboard Changes During the initial dashboard rollout, my test environment (my laptop alongside Debian 11 and Debian 12 VMs) reported a high aggregated vulnerability count. It was not immediately obvious whether these were distinct vulnerabilities or the same CVEs replicated across all three machines. This mirrors common questions raised during vulnerability reviews:
  • How many unique vulnerabilities are present across the fleet?
  • Which unique packages are affected?
The dashboard has been redesigned to surface unique vulnerability counts alongside affected package lists. The updated dashboard is shown below:
What's Next? A few planned items remain to make debvulns a comprehensive vulnerability reporting toolkit for Debian systems:
  1. Kernel Vulnerability Handling: Currently, installing a patched kernel marks the vulnerability as resolved, even if the system has not rebooted into it. The system remains exposed while the vulnerable kernel is executing in memory. Factoring in running kernel versions is crucial.
  2. Reboot and Service Restart Tracking: Similar to kernel upgrades requiring a reboot, userland library and binary fixes require running services to be restarted. This is typically detected via needrestart. Integrating this behavior directly into debvulns will provide complete visibility in a single dashboard metric.
  3. Debian Packaging: Once the above features are stable, the final step is packaging debvulns for Debian so it can be installed directly from the archive.
Until then, happy hacking.

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