8000 gh-135106: [crash repro] Randomly deposit objects in `_Py_Dealloc` by colesbury · Pull Request #135589 · python/cpython · GitHub
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gh-135106: [crash repro] Randomly deposit objects in _Py_Dealloc #135589

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gh-135106: [crash repro] Randomly deposit objects in _Py_Dealloc #135589

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gh-135106: Randomly return `1` in _Py_RecursionLimit_GetMargin
colesbury Jun 16, 2025
92e82ac
Update Include/internal/pycore_pystate.h
colesbury Jun 16, 2025
7c86a25
Update test so that RNG is in _Py_Dealloc
colesbury Jun 17, 2025
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Update Include/internal/pycore_pystate.h 
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
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@colesbury @AA-Turner
colesbury and AA-Turner authored Jun 16, 2025
commit 92e82acb1be29b7d0169f31d8cbc66293ca6a137
6 changes: 3 additions & 3 deletions Include/internal/pycore_pystate.h
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Expand Up @@ -328,9 +328,9 @@ _Py_RecursionLimit_GetMargin(PyThreadState *tstate)

// splitmix64 from https://prng.di.unimi.it/splitmix64.c
uint64_t z = (tstate->prng += 0x9e3779b97f4a7c15);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
uint64_t r = z ^ (z >> 31);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
uint64_t r = z ^ (z >> 31);
if ((r & 0xFF) < 2) { // 2/256 chance = ~ 0.8% chance
return 1;
}
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