PR 026 P2: Use nonignorable fallback child signal - #27
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Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe process transport now uses explicit ChangesTermination fallback hardening
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The fallback now uses an explicit SIGKILL for the directly owned child, but the regression test still does not enforce the single-attempt contract it describes. The PR is mergeable with explicit owner awareness and follow-up to tighten that test. Poem
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Actionable comments posted: 1
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Inline comments:
In `@tests/adapters/process-transport.test.ts`:
- Line 1647: Update the assertion for DIRECT_CHILD_SIGNALS in the relevant
process transport test to require exactly one fallback attempt rather than
accepting any nonzero count. Preserve the existing multiline matching behavior
and verify the recorded signal count is precisely 1.
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src/adapters/process-transport.tstests/adapters/process-transport.test.ts
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| // the fallback, and whether it was ever observed is reported rather than | ||
| // assumed. | ||
| const WAITS_FOR_CHILD = mode === 'terminate-fault-sigterm-ignored'; | ||
| const READY_PATH = join(tmpdir(), 'ab-fallback-ready-' + process.pid); |
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If an earlier probe is interrupted before its tail cleanup and the OS later reuses that probe's PID, this predictable path can already exist when the new probe starts. waitForChildReady() then returns true before the new child installs its SIGTERM handler, allowing the old default-SIGTERM implementation to terminate the child and falsely pass this regression. Remove the marker before spawning, or place it in a freshly created per-run directory.
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@codex Please perform a fresh review of PR #27 against exact CURRENT HEAD 6c711d2. The prior findings were on older HEAD 7f47563 and have been repaired. Do not assume they remain current. Review the complete current PR diff and specifically verify:
Treat findings on any other SHA as stale until reverified against exact CURRENT HEAD. |
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Codex Review: Didn't find any major issues. 👍 Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Codex Review: Didn't find any major issues. Chef's kiss. Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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bb9a21b
into
repair/pr025-termination-fallback-child-leak
1 participant
Purpose
Stacked validation PR for:
PR026-CODEX-NONIGNORABLE-FALLBACK-SIGNALThis PR is intentionally narrow and quarantined.
It is a CHILD OF PR #26.
It targets:
repair/pr025-termination-fallback-child-leakIt does NOT target PR #25 directly.
It does NOT target protected PR #10 directly.
It does NOT target
main.Finding
Finding ID:
PR026-CODEX-NONIGNORABLE-FALLBACK-SIGNALClassification:
CURRENT P2Affected parent HEAD:
b55ac5877e93cc4fafd27e5bd1089c9031fcc68fAfter mandatory post-spawn dispatch hardening fails, the ordinary termination strategy can fault before delivering a signal under hostile
ChildProcessruntime state.PR #26's bounded direct-child fallback then called
ChildProcess.kill()without an explicit signal.On POSIX that defaults to
SIGTERM, which a child may catch or ignore.Because this fallback gets one bounded direct-child attempt and does not wait/escalate, a directly owned child could remain alive after caller-facing rejection.
Repair
The bounded repair changes only the fallback signal for this exact fault path to an explicit:
SIGKILLThe fallback still targets only the directly owned child.
It does not signal a process group or tree and does not introduce any stronger descendant-termination guarantee.
Adversarial regression coverage now includes a POSIX child that installs a
SIGTERMhandler before the fallback executes and verifies transport-abandonment evidence before harness cleanup.Changed files
Exactly:
src/adapters/process-transport.tstests/adapters/process-transport.test.tsNo unrelated files changed.
Protected invariants
The repair preserves:
SPAWN_FAILEDlaundering;AgentExchangelaundering;Exact quarantine identity
Parent PR #26 HEAD:
b55ac5877e93cc4fafd27e5bd1089c9031fcc68fRepair commit:
7f4756329ec8434db6472eb3c2b95ca59d426aefValidated patch SHA-256:
D1ACB9D2AA98AF5289A91BEA439C98DB7C4DC2DD14193D342C9E27877C3D21BFPatch bytes:
12468The committed patch was mechanically verified byte-for-byte identical to the candidate that passed fresh independent validation.
Independent validation
Fresh validator result:
PASSThe validator independently:
CURRENT P2;SPAWN_FAILEDlaundering;AgentExchangelaundering;Validation evidence:
git diff --check: PASS.The POSIX outcome regression was not executed locally on Windows, but is POSIX-gated and is intended to execute on Linux CI. Local validation independently verified the harness staging and signal-observation mechanism and demonstrated baseline/candidate discrimination.
Separate outstanding finding
The separate PR #25 Finding A remains OUT OF SCOPE:
parent-side regression probe missing
ChildProcesserrorhandling.Do not combine it with this repair.
It must be reverified separately after the current repair chain is integrated and PR #25's resulting NEW HEAD is established.
Quarantine rule
This DRAFT PR is evidence/proposal only.
Do not merge merely because implementation, independent validation, CI, Codex, or CodeRabbit reports success.
Required gates before upward integration into PR #26:
Ready is NOT the merge gate.
Summary by CodeRabbit
Bug Fixes
Tests