fix: fix flaky SIGSEGV on musl#278

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claude/reproduce-flaky-failure-RuwlG

Mar 20, 2026

Commits on Mar 20, 2026

test: add milestone stress test to reproduce flaky SIGSEGV on musl

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ci: temporarily focus on musl pty_terminal_test only

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test: increase stress test iterations and add binary loop

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test: add SIGSEGV signal handler for debugging on musl

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test: add SIGSEGV handler to milestone test + run it 500x in CI

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test: improve SIGSEGV handler to capture fault addr + RIP from ucontext

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test: add frame-pointer backtrace + addr2line resolution for crash

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fix: resolve function-cast-as-integer lint in signal handler

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fix: use busybox-compatible grep in CI addr2line script

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test: increase stress iterations to 2000, add objdump + env info

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fix: serialize PTY spawn on musl to avoid libc race condition

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chore: remove debugging artifacts, restore full CI

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fix: hold PTY lock for entire Terminal lifetime on musl

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fix: add `..` to Terminal destructuring for musl _pty_guard field

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ci: add temporary musl stability workflow (10 parallel runs)

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fix: only serialize PTY spawn on musl, not entire lifetime

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chore: remove temporary musl stability workflow

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fix: serialize PTY FD cleanup with spawn on musl
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ci(test-musl): switch to dynamic musl libc linking
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ci(musl): move -crt-static to .cargo/config.toml
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revert: undo -crt-static changes in .cargo/config.toml
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ci(musl): clarify why -crt-static is needed
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fix(fspy_test_bin): force static linking for seccomp test binary
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fix(fspy): allow dynamically-linked test binary in seccomp tests
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fix(fspy): skip static_executable tests on musl
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fix(pty_terminal): use signal_hook instead of ctrlc for musl compat

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ci: add temporary musl stability workflow (10 parallel runs)
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chore: remove temporary musl stability workflow
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ci: verify musl stability (run 1/5)
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fix: guard PTY FD drops with musl lock to prevent SIGSEGV
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fix: serialize milestone tests on musl to prevent SIGSEGV
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fix: use permit-based gate to serialize entire PTY lifetime on musl
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ci: set RUST_TEST_THREADS=1 on musl to prevent concurrent PTY SIGSEGV
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revert: remove PTY gate/permit code from terminal.rs
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chore: remove temporary musl stability workflow
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fix(pty_terminal): use signalfd for SIGINT handling on Linux
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chore: update Cargo.lock for nix signal feature
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