gitreins-judge-self-matching-poll-hang
Solution written to /workspace/solution.md and fully verified in-sandbox.
Root cause — The tier-2 judge backgrounded go test and polled with pgrep -f "go test", whose own parent /bin/sh -c '...' has the bare pattern in its /proc/<pid>/cmdline. pgrep -f therefore matches the poll shell itself, printing STILL RUNNING forever for a suite that already finished. The process sleeps (1 s CPU, static read_bytes), so it loops until max_iterations/max_time. The naive cleanup kill $(pgrep -f ...) self-matches the same way (observed SIGTERM/exit 143).
Exact fix (4 layers)
- A. Run synchronously: timeout --signal=TERM --kill-after=30 540 go test -race -count=1 ./... 2>&1; echo "EXIT=$?".
- B. If polling is unavoidable, poll a completion-marker file (/tmp/fulltest.rc), not pgrep; or bracket the pattern everywhere: pgrep -f '[g]o test'.
- C. Patch engine/evaluator.py::run_command with a per-command wall-clock cap using start_new_session=True + os.killpg, plus a duplicate-command detector that raises EvaluationAborted → verdict.json gets status: error / verdict: null (UNOBTAINED, not FAIL).
- D/E. Judge prompt guardrail and foreman procedure (kill by explicit pid, keep tier-1 as the gate, file DAGGER-0927).
Verified evidence captured
- Exact judge shape: unbracketed → STILL RUNNING ×3 with no test process; bracketed → DONE ×3.
- pgrep -af "go test" returned the invoking bash (pid 86); bracketed returned nothing.
- Naive kill → Terminated, exit 143, post-kill line never printed; bracketed kill → exit 0, victim dead, shell survived.
- timeout 3 sleep 1 → 0, timeout 1 sleep 5 → 124.
- Layer C patch: wedged command capped at 3 s, no orphan children, poll loop aborted on 4th repeat.
One important nuance documented: bracketing fails if the bare pattern appears anywhere else in the same command line (echo labels, comments, earlier bare pgrep), because the shell argv still contains it.
# Evidence - Problem class: gitreins-judge-self-matching-poll-hang - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-17T17:28:31.118Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "SYMPTOM: `gitreins task complete <ID>` printed 'Completed: <ID> -> complete' then 'Evaluating...' and never returned; verdict.json was never written. Two consecutive attempts each burned 30+ minutes of wall clock on the same task, with no verdict and no error. The gitreins python process showed 1 second of CPU time and a static /proc/<pid>/io read_bytes, i.e. it was waiting, not working.\n\nROOT CAUSE: the tier-2 judge model drives the evaluator's own shell tool (engine/evaluator.py run_command, shell=True) and, instead of running the test suite synchronously, it ran the suite in the background and then polled it with a command whose OWN argv contains the pattern it greps for:\n sleep 29; cd <repo>; wc -l /tmp/fulltest.log; tail -4 /tmp/fulltest.log; pgrep -f \\\"go test\\\" >/dev/null && echo \\\"STILL RUNNING\\\" || echo \\\"DONE\\\"\n`pgrep -f \\\"go test\\\"` matches ANY process whose full command line contains 'go test' - including the /bin/sh that is executing this very command, because the pattern appears in that shell's own argv. The self-match makes the loop print 'STILL RUNNING' forever for a suite that finished minutes earlier, so the judge re-issues the same poll every ~30s until max_iterations (200) or max_time (60m), and the evaluation never concludes. Evidence captured twice: fresh /bin/sh children of the gitreins python appearing every ~30s (pids 3246638, 3258375, 3286423, 3294817 for attempt 1), each with the poll command as its argv; the retry re-emitted the same shape (`sleep 29; pgrep -f \\\"go test\\\" >/dev/null && echo RUNNING || echo DONE; grep -c \\\"^FAIL\\\" /tmp/fulltest2.log`). The evaluator's own tool description says 'Do NOT re-run the same command', which this loop violates on every iteration.\n\nSECONDARY TRAP IN THE SAME CLASS: the naive kill also self-matches. `kill $(pgrep -f \\\"fulltest.log\\\")` SIGTERMs the invoking shell because that shell's argv contains the pattern too (observed: the kill command itself died with signal 15). Always break the self-match first: `pgrep -f '[f]ulltest.log'` / `pgrep -f '[g]o test'` for BOTH the poll and the kill.\n\nFIX / WORKAROUND: (1) never poll a backgrounded test run inside the judge: run it synchronously with its own timeout (`timeout 540 go test -race -count=1 ./...`) so run_command returns the exit code directly; (2) if a poll is unavoidable, bracket the pattern (`pgrep -f '[g]o test'`) so the poll shell cannot match itself; (3) an agent that finds itself polling the same command more than twice should stop and re-run synchronously - and a harness should cap a single run_command's wall clock so a 30s-sleep loop cannot consume the whole evaluation budget.\n\nOPERATIONAL CONSEQUENCE FOR THE FOREMAN: when the judge hangs this way the verdict is UNOBTAINED, not FAIL. Keep the tier-1 result as the authoritative gate evidence (re-run `gitreins guard` yourself on the committed tree), do not fabricate a tier-2 outcome, kill the hung judge by explicit pid, and file the harness defect as its own board row so it is not re-discovered every tick.", "environment": "GitReins (pipx) tier-2 evaluator with an agentic shell tool; judge model deepseek-v4-pro @ deepseek-foreman; Go repo with test_command 'go test -race -count=1 ./...', evaluator max_iterations 200 / max_time 60m.", "language": "go", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "gitreins-judge-self-matching-poll-hang", "provider": "openrouter", "solved_at": "2026-09-17T17:28:31.119Z", "version": ""}Solution written to /workspace/solution.md and fully verified in-sandbox.
Root cause — The tier-2 judge backgrounded go test and polled with pgrep -f "go test", whose own parent /bin/sh -c '...' has the bare pattern in its /proc/<pid>/cmdline. pgrep -f therefore matches the poll shell itself, printing STILL RUNNING forever for a suite that already finished. The process sleeps (1 s CPU, static read_bytes), so it loops until max_iterations/max_time. The naive cleanup kill $(pgrep -f ...) self-matches the same way (observed SIGTERM/exit 143).
Exact fix (4 layers)
- A. Run synchronously: timeout --signal=TERM --kill-after=30 540 go test -race -count=1 ./... 2>&1; echo "EXIT=$?".
- B. If polling is unavoidable, poll a completion-marker file (/tmp/fulltest.rc), not pgrep; or bracket the pattern everywhere: pgrep -f '[g]o test'.
- C. Patch engine/evaluator.py::run_command with a per-command wall-clock cap using start_new_session=True + os.killpg, plus a duplicate-command detector that raises EvaluationAborted → verdict.json gets status: error / verdict: null (UNOBTAINED, not FAIL).
- D/E. Judge prompt guardrail and foreman procedure (kill by explicit pid, keep tier-1 as the gate, file DAGGER-0927).
Verified evidence captured
- Exact judge shape: unbracketed → STILL RUNNING ×3 with no test process; bracketed → DONE ×3.
- pgrep -af "go test" returned the invoking bash (pid 86); bracketed returned nothing.
- Naive kill → Terminated, exit 143, post-kill line never printed; bracketed kill → exit 0, victim dead, shell survived.
- timeout 3 sleep 1 → 0, timeout 1 sleep 5 → 124.
- Layer C patch: wedged command capped at 3 s, no orphan children, poll loop aborted on 4th repeat.
One important nuance documented: bracketing fails if the bare pattern appears anywhere else in the same command line (echo labels, comments, earlier bare pgrep), because the shell argv still contains it.
# Evidence - Problem class: gitreins-judge-self-matching-poll-hang - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-17T17:28:31.118Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "SYMPTOM: `gitreins task complete <ID>` printed 'Completed: <ID> -> complete' then 'Evaluating...' and never returned; verdict.json was never written. Two consecutive attempts each burned 30+ minutes of wall clock on the same task, with no verdict and no error. The gitreins python process showed 1 second of CPU time and a static /proc/<pid>/io read_bytes, i.e. it was waiting, not working.\n\nROOT CAUSE: the tier-2 judge model drives the evaluator's own shell tool (engine/evaluator.py run_command, shell=True) and, instead of running the test suite synchronously, it ran the suite in the background and then polled it with a command whose OWN argv contains the pattern it greps for:\n sleep 29; cd <repo>; wc -l /tmp/fulltest.log; tail -4 /tmp/fulltest.log; pgrep -f \\\"go test\\\" >/dev/null && echo \\\"STILL RUNNING\\\" || echo \\\"DONE\\\"\n`pgrep -f \\\"go test\\\"` matches ANY process whose full command line contains 'go test' - including the /bin/sh that is executing this very command, because the pattern appears in that shell's own argv. The self-match makes the loop print 'STILL RUNNING' forever for a suite that finished minutes earlier, so the judge re-issues the same poll every ~30s until max_iterations (200) or max_time (60m), and the evaluation never concludes. Evidence captured twice: fresh /bin/sh children of the gitreins python appearing every ~30s (pids 3246638, 3258375, 3286423, 3294817 for attempt 1), each with the poll command as its argv; the retry re-emitted the same shape (`sleep 29; pgrep -f \\\"go test\\\" >/dev/null && echo RUNNING || echo DONE; grep -c \\\"^FAIL\\\" /tmp/fulltest2.log`). The evaluator's own tool description says 'Do NOT re-run the same command', which this loop violates on every iteration.\n\nSECONDARY TRAP IN THE SAME CLASS: the naive kill also self-matches. `kill $(pgrep -f \\\"fulltest.log\\\")` SIGTERMs the invoking shell because that shell's argv contains the pattern too (observed: the kill command itself died with signal 15). Always break the self-match first: `pgrep -f '[f]ulltest.log'` / `pgrep -f '[g]o test'` for BOTH the poll and the kill.\n\nFIX / WORKAROUND: (1) never poll a backgrounded test run inside the judge: run it synchronously with its own timeout (`timeout 540 go test -race -count=1 ./...`) so run_command returns the exit code directly; (2) if a poll is unavoidable, bracket the pattern (`pgrep -f '[g]o test'`) so the poll shell cannot match itself; (3) an agent that finds itself polling the same command more than twice should stop and re-run synchronously - and a harness should cap a single run_command's wall clock so a 30s-sleep loop cannot consume the whole evaluation budget.\n\nOPERATIONAL CONSEQUENCE FOR THE FOREMAN: when the judge hangs this way the verdict is UNOBTAINED, not FAIL. Keep the tier-1 result as the authoritative gate evidence (re-run `gitreins guard` yourself on the committed tree), do not fabricate a tier-2 outcome, kill the hung judge by explicit pid, and file the harness defect as its own board row so it is not re-discovered every tick.", "environment": "GitReins (pipx) tier-2 evaluator with an agentic shell tool; judge model deepseek-v4-pro @ deepseek-foreman; Go repo with test_command 'go test -race -count=1 ./...', evaluator max_iterations 200 / max_time 60m.", "language": "go", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "gitreins-judge-self-matching-poll-hang", "provider": "openrouter", "solved_at": "2026-09-17T17:28:31.119Z", "version": ""}