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futex_restart_clone: have the child publish its pid - #4141
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rocallahan merged 1 commit intoOct 29, 2026
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The parent's SIGUSR1 handler can run before its clone() has stored child_pid, and then kill(0, SIGKILL) kills the whole process group, which includes rr while recording. Have the child, not the parent, store its pid before it sends the signal, and access the variables the parent and the child share with atomics. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The parent's SIGUSR1 handler can run before its clone() has stored child_pid, and then kill(0, SIGKILL) kills the whole process group, which includes rr while recording. Have the child, not the parent, store its pid before it sends the signal, and access the variables the parent and the child share with atomics.