dockerd likely remains stuck in a socket churn loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
Published session
Prompt
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` upstream patch, not just a Debian-local workaround.
Codex subagent/fan-out expectation: for any non-trivial investigation, do not keep all checking in the lead context. Proactively spawn bounded leaf subagents for independent source inspection, duplicate/upstream search, implementation sanity checks, and verification while the lead owns integration. Use the newest available mini model for read-only scouts, and use `gpt-5.3-codex-spark` aggressively for tiny coding, test, and verification leaves even when the lead model is `gpt-5.6-luna`. Pass model names explicitly when spawning. Keep subagents as leaves: tell them not to spawn their own agents, not to run recursive `codex review`, not to perform public/external/destructive actions, and not to duplicate the same live-state operation. Merge their evidence into the final patch/report instead of merely saying a subagent looked. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, timing/throttling behavior, or PostgreSQL database-core behavior such as dynamic library resolution, extension loading, transaction semantics, locking, planner/executor behavior, catalog changes, or storage changes, treat it as high-risk: do not plan a source patch unless validation can reproduce the behavior and analyze the semantic impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` upstream patch, not just a Debian-local workaround.
Codex subagent/fan-out expectation: for any non-trivial investigation, do not keep all checking in the lead context. Proactively spawn bounded leaf subagents for independent source inspection, duplicate/upstream search, implementation sanity checks, and verification while the lead owns integration. Use the newest available mini model for read-only scouts, and use `gpt-5.3-codex-spark` aggressively for tiny coding, test, and verification leaves even when the lead model is `gpt-5.6-luna`. Pass model names explicitly when spawning. Keep subagents as leaves: tell them not to spawn their own agents, not to run recursive `codex review`, not to perform public/external/destructive actions, and not to duplicate the same live-state operation. Merge their evidence into the final patch/report instead of merely saying a subagent looked.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis. PostgreSQL database-core source changes touching dynamic library resolution, extension loading, transaction semantics, locking, planner/executor behavior, catalog changes, or storage changes require reproduced evidence plus explicit semantic-impact analysis. Otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` upstream patch, not just a Debian-local workaround.
Codex subagent/fan-out expectation: for any non-trivial investigation, do not keep all checking in the lead context. Proactively spawn bounded leaf subagents for independent source inspection, duplicate/upstream search, implementation sanity checks, and verification while the lead owns integration. Use the newest available mini model for read-only scouts, and use `gpt-5.3-codex-spark` aggressively for tiny coding, test, and verification leaves even when the lead model is `gpt-5.6-luna`. Pass model names explicitly when spawning. Keep subagents as leaves: tell them not to spawn their own agents, not to run recursive `codex review`, not to perform public/external/destructive actions, and not to duplicate the same live-state operation. Merge their evidence into the final patch/report instead of merely saying a subagent looked. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptograph
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Response
## Plan Pass
## Problem
Fixer reports elevated kernel CPU attributed to `mem_cgroup_handle_over_high` while Debian’s `dockerd` process is sleeping. The capture shows 185 threads, mostly in `futex` waits; the small number of `recvmsg` calls does not establish a socket-churn loop. The dockerd entrypoint and Debian service path are consistent, so the evidence does not point to an upstream source defect.
## Evidence Confidence
inferred
The profiler sample is only 3 seconds, user-space frames are unresolved, and the backtraces do not identify a Moby call site. The “socket-churn” label is not substantiated by the syscall excerpt. Before editing, collect a symbolized profile and correlate cgroup memory-pressure counters, daemon logs, and containerd/socket state on the affected host. No independent reproduction is available in this workspace.
## Proposed Subject
No patch planned: diagnose host/kernel memory pressure and collect symbolized daemon evidence before attributing the CPU signal to Moby.
## Patch Plan
No source change is justified by the available evidence; do not change runtime retry, memory, or socket behavior speculatively. The daemon’s startup path is in `engine/cmd/dockerd/docker.go`; Debian’s service invokes the installed daemon consistently. The contributor guidance favors focused tests and formatted Go, but no relevant local helper API applies without an identified source change. Prepare any future upstream patch against `master`, not a Debian-only stable-branch workaround. No prior Fixer patch was found to improve or replace.
## Risks
A speculative fix could alter daemon runtime behavior without addressing the kernel-side hotspot. The captured signal may depend on host cgroup pressure or kernel behavior. This is a diagnosis plan, not a confirmed upstream bug fix.
## Validation
From the workspace root, try `debian/rules build` as the package build entrypoint before any focused compile or smoke check; for an upstream unit-test pass, use `make -C engine test-unit`. Independently, if the reported host is available, perform one bounded, read-only 30-second profile of the same daemon command while recording cgroup memory-pressure counters and containerd/socket state. This workspace lacks the captured runtime and matching host conditions, so neither step can be claimed to reproduce the failure.
## Patch Pass
Subject: Diagnose dockerd memory-pressure profile before proposing a fix
## Commit Message
No source change. Fixer’s profile points to kernel memory-cgroup pressure, but does not identify a Moby call site or establish a daemon defect. Gather symbolized evidence from the affected host before changing upstream behavior.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is 34.73% of the short profile in the kernel function `mem_cgroup_handle_over_high`, while `/proc` reports `dockerd` sleeping with 185 threads. The trace is dominated by `futex`, `nanosleep`, and `epoll_pwait`, with only five `recvmsg` calls; that does not support the reported “socket churn” interpretation. This is consistent with host memory-cgroup pressure, but unresolved user-space frames leave its cause and any connection to Moby uncertain. No source change is warranted without a symbolized profile and correlated cgroup counters, logs, and containerd/socket state.
## Git Add Paths
None
## Validation
- `debian/rules build` from the workspace root failed because `dh` could not load the missing `Debian::Debhelper::Sequence::golang` module.
- `go test ./cmd/dockerd` from `engine/` failed because required modules are unavailable with `-mod=readonly`; it also reported that `GOCACHE` is unset.
- No independent reproduction: `pgrep -a dockerd` found no local daemon to profile, so the captured signal cannot be safely repeated here. `perf` and `strace` are installed, but the affected host and its runtime conditions are unavailable.
- The worktree remains clean.
## Review Pass 1
RESULT: fix-needed
## Findings
- `patch-output.txt` uses a subject longer than the 50-character maximum in `engine/CONTRIBUTING.md:210`. Shorten it to an imperative subject such as “Diagnose dockerd memory pressure.” The no-patch diagnosis and its cautious interpretation of the profiler evidence are otherwise appropriate; the workspace contains no source diff.
## Refinement Pass 1
## Workflow Note
{"type":"item.completed","item":{"id":"item_3","type":"command_execution","command":"/bin/bash -lc \"printf '%s\\\\n' '--- plan ---'; cat ./plan-output.txt; printf '\\\\n--- latest response ---\\\\n'; cat ./patch-output.txt; printf '\\\\n--- review ---\\\\n'; cat ./review-1-output.txt; printf '\\\\n--- worktree ---\\\\n'; git status --short --branch; git diff --stat; printf '\\\\n--- style rule ---\\\\n'; sed -n '208,214p' engine/CONTRIBUTING.md\"","aggregated_output":"--- plan ---\n## Problem\nFixer reports elevated kernel CPU attributed to `mem_cgroup_handle_over_high` while Debian’s `dockerd` process is sleeping. The capture shows 185 threads, mostly in `futex` waits; the small number of `recvmsg` calls does not establish a socket-churn loop. The dockerd entrypoint and Debian service path are consistent, so the evidence does not point to an upstream source defect.\n\n## Evidence Confidence\ninferred\n\nThe profiler sample is only 3 seconds, user-space frames are unresolved, and the backtraces do not identify a Moby call site. The “socket-churn” label is not substantiated by the syscall excerpt. Before editing, collect a symbolized profile and correlate cgroup memory-pressure counters, daemon logs, and containerd/socket state on the affected host. No independent reproduction is available in this workspace.\n\n## Proposed Subject\nNo patch planned: diagnose host/kernel memory pressure and collect symbolized daemon evidence before attributing the CPU signal to Moby.\n\n## Patch Plan\nNo source change is justified by the available evidence; do not change runtime retry, memory, or socket behavior speculatively. The daemon’s startup path is in `engine/cmd/dockerd/docker.go`; Debian’s service invokes the installed daemon consistently. The contributor guidance favors focused tests and formatted Go, but no relevant local helper API applies without an identified source change. Prepare any future upstream patch against `master`, not a Debian-only stable-branch workaround. No prior Fixer patch was found to improve or replace.\n\n## Risks\nA speculative fix could alter daemon runtime behavior without addressing the kernel-side hotspot. The captured signal may depend on host cgroup pressure or kernel behavior. This is a diagnosis plan, not a confirmed upstream bug fix.\n\n## Validation\nFrom the workspace root, try `debian/rules build` as the package build entrypoint before any focused compile or smoke check; for an upstream unit-test pass, use `make -C engine test-unit`. Independently, if the reported host is available, perform one bounded, read-only 30-second profile of the same daemon command while recording cgroup memory-pressure counters and containerd/socket state. This workspace lacks the captured runtime and matching host conditions, so neither step can be claimed to reproduce the failure.\n--- latest response ---\nSubject: Diagnose dockerd memory-pressure profile before proposing a fix\n\n## Commit Message\nNo source change. Fixer’s profile points to kernel memory-cgroup pressure, but does not identify a Moby call site or establish a daemon defect. Gather symbolized evidence from the affected host before changing upstream behavior.\n\n## Evidence Confidence\ninferred\n\n## Issue Connection\nThe collected signal is 34.73% of the short profile in the kernel function `mem_cgroup_handle_over_high`, while `/proc` reports `dockerd` sleeping with 185 threads. The trace is dominated by `futex`, `nanosleep`, and `epoll_pwait`, with only five `recvmsg` calls; that does not support the reported “socket churn” interpretation. This is consistent with host memory-cgroup pressure, but unresolved user-space frames leave its cause and any connection to Moby uncertain. No source change is warranted without a symbolized profile and correlated cgroup counters, logs, and containerd/socket state.\n\n## Git Add Paths\nNone\n\n## Validation\n- `debian/rules build` from the workspace root failed because `dh` could not load the missing `Debian::Debhelper::Sequence::golang` module.\n- `go test ./cmd/dockerd` from `engine/` failed because required modules are unavailable with `-mod=readonly`; it also reported that `GOCACHE` is unset.\n- No independent reproduction: `pgrep -a dockerd` found no local daemon to profile, so the captured signal cannot be safely repeated here. `perf` and `strace` are installed, but the affected host and its runtime conditions are unavailable.\n- The worktree remains clean.\n--- review ---\nRESULT: fix-needed\n\n## Findings\n- `patch-output.txt` uses a subject longer than the 50-character maximum in `engine/CONTRIBUTING.md:210`. Shorten it to an imperative subject such as “Diagnose dockerd memory pressure.” The no-patch diagnosis and its cautious interpretation of the profiler evidence are otherwise appropriate; the workspace contains no source diff.\n--- worktree ---\n## master\n\n--- style rule ---\n### Commit Messages\n\nCommit messages must start with a capitalized and short summary (max. 50 chars)\nwritten in the imperative, followed by an optional, more detailed explanatory\ntext which is separated from the summary by an empty line.\n\nCommit messages should follow best practices, including explaining the context\n","exit_code":0,"status":"completed"}}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Upstream websocket closed before response.completed: Upstream websocket receive failed)"}
{"type":"error","message":"Reconnecting... 2/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: d31a7467-22dd-43f4-affd-1bb7187ab15d)"}
{"type":"error","message":"Reconnecting... 3/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 416cef8c-b74d-41f5-b4c4-b1dc593e138f)"}
{"type":"error","message":"Reconnecting... 4/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 733d2d4a-a302-4e18-ab4a-10801d26fc82)"}
{"type":"error","message":"Reconnecting... 5/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: b0f6ec8c-e2ea-4936-a0f9-3e9144b7d02b)"}
{"type":"error","message":"unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 1d7d734d-b72e-42e5-bfca-d0ee5c3e00fd"}
{"type":"turn.failed","error":{"message":"unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 1d7d734d-b72e-42e5-bfca-d0ee5c3e00fd"}}