Fix stdio client shutdown bugs and rebuild the stdio test suite#2773

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maxisbey/deflake-stdio-tests

Commits on Jun 3, 2026

Replace wall-clock margins in stdio cleanup tests with kernel-level signals
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Fix stdio client shutdown: cancellation deadlock, orphaned children, spurious kills
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Consolidate stdio tests: in-process logic tests, minimal real-process set
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Commits on Jun 4, 2026

Add real-subprocess stdio lifecycle tests for POSIX and Windows
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Address review findings: comment accuracy, test hardening, trio reap pin
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Make the Windows job-reap test diagnosable and align its server shape
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Instrument the Windows job-reap test's child-side failures
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Spawn the job-reap test's grandchild via the base interpreter
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Decouple the job-reap test's child from the server's stdin pipe
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Give the stdio interaction test's child headroom for coverage shutdown
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