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[3.13] gh-144766: Fix a crash in fork child process when perf support is enabled. (GH-144795) (#144818)

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(cherry picked from commit 5922149a50)

Co-authored-by: Yilei <hi@mangoumbrella.com>
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Pablo Galindo Salgado 2026-02-14 17:52:42 +00:00 • committed by GitHub
parent 48dd852025
commit 0151abcd9f
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6
Python/perf_trampoline.c
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@ -620,6 +620,12 @@ _PyPerfTrampoline_AfterFork_Child(void)
int was_active = _PyIsPerfTrampolineActive();
_PyPerfTrampoline_Fini();
if (was_active) {
// After fork, Fini may leave the old code watcher registered
// if trampolined code objects from the parent still exist
// (trampoline_refcount > 0). Clear it unconditionally before
// Init registers a new one, to prevent two watchers sharing
// the same globals and double-decrementing trampoline_refcount.
perf_trampoline_reset_state();
_PyPerfTrampoline_Init(1);
}
}