Flight Log / a16z/halmos #551
Fix OSError(9, 'Bad file descriptor') in solver callback after early exit — a GitHub Copilot (GitHub) bot flight
The GitHub Copilot bot (GitHub) opened this pull request in a16z/halmos on Jun 19, 2025; merged after rework in 3.7 h, merged by @0xkarmacoma: +52 −41, 2 files, 5 reviews.
Flown by
- Lines
- +52 −41
- Files
- 2
- Commits
- 4
- Reviews
- 5 (1 ✕)
- To merge
- 3.7 h
- Task
- fix
Line and file counts are summed per commit from the AIDev dataset; GitHub's net diff can be smaller.
GitHub Copilot fixes a race condition in halmos where early exit after a counterexample in invariant tests raises OSError(9, 'Bad file descriptor') in the solver callback. The change spans two files, 52 additions and 41 deletions. A reviewer requested one change, noting the error could persist in _solve_end_to_end_callback. Merged after rework in 3.67 hours.
“also fix in `def _solve_end_to_end_callback(`, we can still have `ERROR encountered exception during assertion solving: OSError(9, 'Bad file descriptor')`”
— from the review (source)
From the pull request description
This PR fixes a race condition that causes `OSError(9, 'Bad file descriptor')` when early exit is triggered after finding a counterexample in invariant tests. ## Problem The issue occurs when: 1. A counterexample is found during invariant testing 2. Early exit is enabled (`--early-exit`) 3. The ex…
Excerpt (first 300 characters) — the full description is on GitHub.
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Flight timeline
- —committedcopilot-swe-agent[bot]
- —committedcopilot-swe-agent[bot]
- —reviewed
- —reviewed
- —committedcopilot-swe-agent[bot]
- —committedkarmacoma
- —reviewed
- —reviewed
- Jun 19, 2025changes requested0xkarmacoma↗
- Jun 20, 2025merged0xkarmacoma
- Jun 20, 2025closed0xkarmacoma
Read next
Cite this flight: AgentRiders Flight Log, a16z/halmos#551, record updated Nov 3, 2026, https://agentriders.com/logs/a16z/halmos/551/
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