https://github.com/python/cpython/commit/3bfb7da3d70884ec8ec192bcafe4f1744fecf358
commit: 3bfb7da3d70884ec8ec192bcafe4f1744fecf358
branch: 3.13
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: colesbury <colesb...@gmail.com>
date: 2025-06-18T18:47:59Z
summary:
[3.13] gh-135641: Fix flaky `test_capi.test_lock_two_threads` test case
(gh-135642) (gh-135688)
The mutex may have the `_Py_HAS_PARKED` bit set.
(cherry picked from commit 17ac3933c3c860e08f7963cf270116a39a063be7)
Co-authored-by: Sam Gross <colesb...@gmail.com>
files:
M Modules/_testinternalcapi/test_lock.c
diff --git a/Modules/_testinternalcapi/test_lock.c
b/Modules/_testinternalcapi/test_lock.c
index 8d678412fe7179..8d8cb992b0e07f 100644
--- a/Modules/_testinternalcapi/test_lock.c
+++ b/Modules/_testinternalcapi/test_lock.c
@@ -57,7 +57,10 @@ lock_thread(void *arg)
_Py_atomic_store_int(&test_data->started, 1);
PyMutex_Lock(m);
- assert(m->_bits == 1);
+ // gh-135641: in rare cases the lock may still have `_Py_HAS_PARKED` set
+ // (m->_bits == 3) due to bucket collisions in the parking lot hash table
+ // between this mutex and the `test_data.done` event.
+ assert(m->_bits == 1 || m->_bits == 3);
PyMutex_Unlock(m);
assert(m->_bits == 0);
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