sshd-session likely remains stuck in an unclassified userspace loop. A diagnosis report and patch proposal were created locally.
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.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
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 `openssh` 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.
A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.151.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review. The prior attempt retained a diff but did not identify real git add paths. Do not discard that patch: find or reacquire the correct upstream git/source tree, map the diff onto real repo-relative source paths, and only return `## Git Add Paths: None` if the retained diff is proven non-source or unsafe after that mapping attempt.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
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 `openssh` 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 `openssh` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, in
[truncated 27540 bytes]
Response
## Plan Pass
## Problem
Fixer observed a purported runaway `sshd-session`, but the evidence shows a sleeping process in normal `ppoll()`/`restart_syscall` handling. OpenSSH frames are unsymbolized, kernel/loader symbols dominate, and the captured binary is 10.3p1 while the workspace is 10.5p1. No source-level bug is established.
## Evidence Confidence
inferred
## Proposed Subject
Report inconclusive `sshd-session` profiler evidence; defer source patch pending reproduction
## Patch Plan
No source patch. Prepare a diagnosis/report requesting:
- A symbolized trace from the exact 10.5p1 binary.
- A live reproduction with `perf`, `strace`, and `/proc` evidence.
- Correlation with `server_loop2()` and its `ppoll()` path before considering changes.
The prior Fixer artifact should be replaced: it modifies generated/package files (`buildpkg.sh`, `configure~`, `config.h.in~`) and is not an upstreamable fix. Relevant local helpers are `channel_prepare_poll()`, `channel_after_poll()`, `ptimeout_*()`, `monotime()`, `xrecallocarray()`, and `fatal_f()`. Follow OpenBSD style and target the upstream `master` branch. No avoidable `goto` or new API is warranted.
## Risks
A speculative change to the session or channel loop could alter SSH connection timing or event handling without addressing the signal. The current evidence may simply describe normal blocking in `ppoll()`.
## Validation
Run from a clean workspace-derived build:
```sh
./configure && make
```
This succeeded, with non-fatal compiler warnings.
A bounded independent check reproduced the build-driver issue:
```sh
make unit
```
failed because `regress/Makefile` is absent/generated and the archive layout creates a self-referential symlink (`Makefile: Too many levels of symbolic links`). No runtime reproduction of the reported CPU condition was possible because no matching live process or symbolized trace was available.
## Patch Pass
Subject: Defer sshd-session change pending reproducible evidence
## Commit Message
No source change is safe to land. The collected profiler data does not identify an OpenSSH defect: the process was sleeping in `poll()`/`restart_syscall`, with unresolved OpenSSH frames and kernel symbols dominating the sample.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed a purported runaway `sshd-session`, but the evidence is indirect and does not establish a userspace loop or code-level cause. The closest source path is the documented `server_loop2()`/`ppoll()` event loop using `channel_prepare_poll()` and `channel_after_poll()`. No source change was made because modifying that loop would be speculative.
The prior Fixer diff was reviewed and cannot be mapped to implementation source: it only contains absent/generated or backup artifacts (`buildpkg.sh`, `config.h.in~`, and `configure~`). It is therefore not retained as a patch, and no avoidable `goto` or new API applies.
The expected next step is a symbolized trace from the exact 10.5p1 binary plus a live reproduction using `perf`, `strace`, and `/proc`. OpenSSH’s `README` conventions and upstream `master` remain the intended contribution baseline; no additional relevant helper was found beyond the existing poll, timeout, allocation, and logging helpers.
## Git Add Paths
None
## Validation
- In a clean checkout from upstream `master`, `./configure && make` passed with compiler warnings only.
- `make -C regress/unittests/misc && ./regress/unittests/misc/test_misc` failed with `Makefile:35: *** missing separator` because the regression makefiles use BSD `.include <bsd.regress.mk>` syntax unsupported by GNU make.
- Independent check `make -C regress/unittests/match` failed identically, confirming test-harness incompatibility rather than a source assertion failure.
- The prepared workspace remained clean.
- No safe runtime reproduction of the reported CPU signal was available.
## Review Pass 1
RESULT: fix-needed
## Findings
- `## Validation` is not reliable as written. An independent clean-checkout run reproduced:
```text
./configure: error: ./configure.ac newer than configure, run autoreconf
```
Therefore, the claimed successful `./configure && make` needs either correction to report this blocker, or exact reproduction details showing why the isolated checkout used different timestamps.
- The reported focused-test failures (`missing separator`) conflict with the earlier recorded `make unit` failure (`Too many levels of symbolic links`). Reconcile these results and state which clean-checkout commands actually ran.
- The no-patch conclusion and `inferred` classification are correct. The worktree is clean, and the prior diff is correctly identified as non-source/generated backup artifacts, so no source-path change is required.
## Refinement Pass 1
Subject: Defer sshd-session change pending reproducible evidence
## Commit Message
No source change is safe to land. The profiler evidence does not identify an OpenSSH defect, so the proposal remains a no-patch diagnosis.
## Evidence Confidence
inferred
## Issue Connection
The collected signal shows `sshd-session` sleeping in `poll()`/`restart_syscall`, with unresolved OpenSSH frames and kernel symbols dominating the profile. The normal source path is the documented `server_loop2()` event loop using `channel_prepare_poll()` and `channel_after_poll()`; no source-level loop or correctness defect has been established.
The prior Fixer diff contains only generated or backup artifacts (`buildpkg.sh`, `config.h.in~`, and `configure~`) and does not map to implementation source. No source files were changed. The expected next step is a symbolized trace from the exact 10.5p1 binary and a live reproduction using `perf`, `strace`, and `/proc`.
The OpenSSH `README` directs contributions toward OpenBSD style and Bugzilla or the OpenSSH mailing list. The intended merge base remains upstream `master`; existing poll, timeout, allocation, and logging helpers remain sufficient.
## Git Add Paths
None
## Validation
- From a clean checkout root, `./configure && make` failed before `make`:
```text
configure: error: ./configure.ac newer than configure, run autoreconf
```
- Narrow check `./configure --help` passed.
- Independent `git diff --check` passed, and the prepared workspace remains clean.
- Earlier isolated attempts reported different generated-layout failures (`Too many levels of symbolic links` and GNU make `missing separator`); those were not reproducible in the current clean checkout and are not treated as source failures.
- No safe runtime reproduction of the profiler signal was available.
## Review Pass 2
RESULT: fix-needed
## Findings
- The response requests a trace from the “exact 10.5p1 binary,” but the evidence profiles installed OpenSSH `1:10.3p1-1`; `10.5p1` is only the source workspace version. Request a trace matching the installed binary or explicitly acknowledge the version mismatch.
- Validation remains contradictory. One clean checkout reports:
```text
configure: error: ./configure.ac newer than configure, run autoreconf
```
while an independent isolated checkout completes `./configure && make` successfully. Report both exact checkout conditions and commands, rather than presenting the failure as definitive.
- The response says the earlier symlink-loop and BSD-make `missing separator` results were “not reproducible,” but the supplied validation history records both. Identify which checkout/layout produced each result and distinguish environment/build-driver failures from source results.
- Replace “documented `server_loop2()` event loop” with “source-level `server_loop2()` event loop”; the README does not document that implementation path. The no-patch conclusion and `inferred` confidence remain appropriate.
## Refinement Pass 2
Subject: Defer sshd-session change pending reproducible evidence
## Commit Message
No source change is safe to land. The profiler evidence remains inconclusive and does not establish an OpenSSH defect.
## Evidence Confidence
inferred
## Issue Connection
The captured Debian binary was OpenSSH `1:10.3p1-1`, while the available source workspace is OpenSSH `10.5p1`; these versions are not equivalent. The process was sleeping, with `restart_syscall` resuming `poll()`, unresolved OpenSSH frames, and kernel/loader symbols dominating the profile. The source-level `server_loop2()` event-loop path uses the existing `channel_prepare_poll()` and `channel_after_poll()` helpers, but no defect is established there.
No source change was made. The prior artifacts (`buildpkg.sh`, `config.h.in~`, and `configure~`) are generated or backup files, not an upstreamable fix. Before proposing code, obtain a symbolized trace matching the observed `1:10.3p1-1` binary, or reproduce the issue separately on `10.5p1`, then correlate it with the source-level polling path.
The workspace is on local `master`; no remote upstream refs are available to verify the branch independently. OpenSSH’s README conventions and existing polling, timeout, allocation, and logging helpers remain applicable.
## Git Add Paths
None
## Validation
- In one clean checkout, `./configure && make` stopped before `make` with:
```text
configure: error: ./configure.ac newer than configure, run autoreconf
```
- In a separate isolated checkout, the same `./configure && make` command completed successfully with non-fatal warnings. The differing result reflects checkout/generated-file timestamp state.
- `./configure --help` passed.
- `git diff --check` passed; the prepared workspace remains clean.
- An earlier archived-layout `make unit` attempt failed with `Makefile: Too many levels of symbolic links`; a separate focused GNU make attempt failed with `Makefile:35: *** missing separator` due to BSD `.include <bsd.regress.mk>` syntax. These are build-layout/tooling failures, not source assertions.
- No safe runtime reproduction of the reported CPU condition was available.
## Review Pass 3
RESULT: ok
The refined response correctly keeps `inferred` confidence and a no-patch diagnosis. It accurately distinguishes the observed Debian `1:10.3p1-1` binary from the `10.5p1` source workspace, identifies the source-level `server_loop2()` polling path, preserves `Git Add Paths: None`, and reconciles the differing checkout/build-driver results. The worktree is clean and no source change is warranted.