typescript-vitest-backgrounded-run-reaped-by-runner
Done. I diagnosed the wedge, built a runnable reproduction of the exact mechanism, and wrote the verified solution to /workspace/solution.md (plus a minimal repro in /workspace/repro/).
/tmp/*.log so the tool call returns.command_hygiene.run_bounded runs commands in their own process group and reaps the group at tool return, killing the &-backgrounded child before it writes → logs stay 0-byte.pgrep -f 'npx vitest' self-matches its own argv, so the agent reads a dead run as alive until the 90 min cap; async judge never flips tasks.yaml.command_timeout_seconds per repo in .gitreins/config.yaml to max(120, 4 × p95 suite runtime) — e.g. 300 for the 53 s suite — then reload the runner. This keeps the suite in the foreground so backgrounding never happens.run_bounded return a structured TimedOut/ReturnedWithDescendants error instead of silently reaping.pgrep -fa '[v]itest run' (bracket trick) or scan /proc; make async tier-2 write a terminal status and flip tasks.yaml.The repro proves all legs:
- broken config (2 s) → outcome=backgrounded-wedge suite_log_bytes=0 → WEDGED
- fixed config (300 s) → outcome=done-sync suite_log_bytes=11 → PASS
- pgrep -f self-match reproduced; bracket /proc variant does not self-match.
The markdown also includes the real-repo verification commands, a recovery runbook for already-wedged jobs (kill poll shells + judge, mark failed, --skip-tier2, flake discriminator, manual tasks.yaml flip), and a prevention checklist.
# Evidence - Problem class: typescript-vitest-backgrounded-run-reaped-by-runner - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-25T21:52:32.712Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "Async tier2 judge wedges forever: the evaluator's inner agent runs a long vitest/tsc suite (~53s), sees it exceed the runner's 30s per-command timeout under host load, and falls back to BACKGROUNDING the run with output redirected to /tmp logs. The runner's command_hygiene.run_bounded process-group reap kills the backgrounded run at tool-return, so the log files stay 0-byte forever while the agent keeps polling its own dead artifacts (pgrep -f self-matches its own poll shell; 28s sleep-poll loops) until the global time cap. Nothing is wrong with the code under test - the suite passes when run in the foreground.", "environment": "Linux host under fleet load (loadavg 8-15, 64 cores); vitest 5.x full unit suite ~53s; gitreins tier2 evaluator agent with 30s per-command timeout and process-group reaping at tool return; reproduced twice in one night, two different jobs (62min and 8min wedges), identical signature", "language": "typescript", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "typescript-vitest-backgrounded-run-reaped-by-runner", "provider": "openrouter", "solved_at": "2026-09-25T21:52:32.712Z", "version": ""}Done. I diagnosed the wedge, built a runnable reproduction of the exact mechanism, and wrote the verified solution to /workspace/solution.md (plus a minimal repro in /workspace/repro/).
/tmp/*.log so the tool call returns.command_hygiene.run_bounded runs commands in their own process group and reaps the group at tool return, killing the &-backgrounded child before it writes → logs stay 0-byte.pgrep -f 'npx vitest' self-matches its own argv, so the agent reads a dead run as alive until the 90 min cap; async judge never flips tasks.yaml.command_timeout_seconds per repo in .gitreins/config.yaml to max(120, 4 × p95 suite runtime) — e.g. 300 for the 53 s suite — then reload the runner. This keeps the suite in the foreground so backgrounding never happens.run_bounded return a structured TimedOut/ReturnedWithDescendants error instead of silently reaping.pgrep -fa '[v]itest run' (bracket trick) or scan /proc; make async tier-2 write a terminal status and flip tasks.yaml.The repro proves all legs:
- broken config (2 s) → outcome=backgrounded-wedge suite_log_bytes=0 → WEDGED
- fixed config (300 s) → outcome=done-sync suite_log_bytes=11 → PASS
- pgrep -f self-match reproduced; bracket /proc variant does not self-match.
The markdown also includes the real-repo verification commands, a recovery runbook for already-wedged jobs (kill poll shells + judge, mark failed, --skip-tier2, flake discriminator, manual tasks.yaml flip), and a prevention checklist.
# Evidence - Problem class: typescript-vitest-backgrounded-run-reaped-by-runner - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-25T21:52:32.712Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "Async tier2 judge wedges forever: the evaluator's inner agent runs a long vitest/tsc suite (~53s), sees it exceed the runner's 30s per-command timeout under host load, and falls back to BACKGROUNDING the run with output redirected to /tmp logs. The runner's command_hygiene.run_bounded process-group reap kills the backgrounded run at tool-return, so the log files stay 0-byte forever while the agent keeps polling its own dead artifacts (pgrep -f self-matches its own poll shell; 28s sleep-poll loops) until the global time cap. Nothing is wrong with the code under test - the suite passes when run in the foreground.", "environment": "Linux host under fleet load (loadavg 8-15, 64 cores); vitest 5.x full unit suite ~53s; gitreins tier2 evaluator agent with 30s per-command timeout and process-group reaping at tool return; reproduced twice in one night, two different jobs (62min and 8min wedges), identical signature", "language": "typescript", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "typescript-vitest-backgrounded-run-reaped-by-runner", "provider": "openrouter", "solved_at": "2026-09-25T21:52:32.712Z", "version": ""}