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gh-142881: Fix concurrent and reentrant call of atexit.unregister() #142901

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Merged
serhiy-storchaka merged 2 commits into from
Jan 12, 2026
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gh-142881: Fix concurrent and reentrant call of atexit.unregister() #142901

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gh-142881: Fix concurrent and reentrant call of atexit.unregister()
serhiy-storchaka Dec 17, 2025
edfaa71
Update Modules/atexitmodule.c
serhiy-storchaka Dec 17, 2025
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Update Modules/atexitmodule.c 
Co-authored-by: Bartosz Sławecki <[email protected]>
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@serhiy-storchaka @johnslavik
serhiy-storchaka and johnslavik authored Dec 17, 2025
commit edfaa716dcfd4a0d40a79785393b270dfb02ef4b
2 changes: 1 addition & 1 deletion Modules/atexitmodule.c
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Expand Up @@ -267,7 +267,7 @@ atexit_unregister_locked(PyObject *callbacks, PyObject *func)
}
if (cmp == 1) {
// We found a callback!
// But it's index could be changed if it or other callbacks were
// But its index could have changed if it or other callbacks were
// unregistered during the comparison.
Py_ssize_t j = PyList_GET_SIZE(callbacks) - 1;
j = Py_MIN(j, i);
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