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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_threading fails and crashes when rerun","articleBody":"# Crash report\n\nFirst, `BarrierTests.test_default_timeout` in `test_threading` fails, producing also several unraisable exception messages. They are produced even during running few following tests.\n\nhttps://github.com/python/cpython/actions/runs/6094370280/job/16535778004#step:5:103\n```\ntest_default_timeout (test.test_threading.BarrierTests.test_default_timeout)\nTest the barrier's default timeout ... Warning -- Unraisable exception\nException ignored in thread started by: \u003cfunction Bunch.__init__.\u003clocals\u003e.task at 0x053F5270\u003e\nTraceback (most recent call last):\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 48, in task\n    f()\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1020, in f\n    i = barrier.wait()\n        ^^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 709, in wait\n    self._wait(timeout)\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 749, in _wait\n    raise BrokenBarrierError\nthreading.BrokenBarrierError: \nERROR\ntest_repr (test.test_threading.BarrierTests.test_repr) ... Warning -- Unraisable exception\nException ignored in thread started by: \u003cfunction Bunch.__init__.\u003clocals\u003e.task at 0x053F5270\u003e\nTraceback (most recent call last):\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 48, in task\n    f()\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1020, in f\n    i = barrier.wait()\n        ^^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 709, in wait\n    self._wait(timeout)\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 749, in _wait\n    raise BrokenBarrierError\nthreading.BrokenBarrierError: \nWarning -- Unraisable exception\nException ignored in thread started by: \u003cfunction Bunch.__init__.\u003clocals\u003e.task at 0x053F5270\u003e\nTraceback (most recent call last):\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 48, in task\n    f()\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1020, in f\n    i = barrier.wait()\n        ^^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 709, in wait\n    self._wait(timeout)\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 749, in _wait\n    raise BrokenBarrierError\nthreading.BrokenBarrierError: \nWarning -- Unraisable exception\nException ignored in thread started by: \u003cfunction Bunch.__init__.\u003clocals\u003e.task at 0x053F5270\u003e\nTraceback (most recent call last):\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 48, in task\n    f()\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1020, in f\n    i = barrier.wait()\n        ^^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 700, in wait\n    self._enter() # Block while the barrier drains.\n    ^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 724, in _enter\n    raise BrokenBarrierError\nthreading.BrokenBarrierError: \nok\n```\n\nAfter rerunning `test_threading` it crashes.\n\nhttps://github.com/python/cpython/actions/runs/6094370280/job/16535778004#step:5:1067\n```\n0:17:28 Re-running 2 failed tests in verbose mode in subprocesses\n0:17:28 Run tests in parallel using 4 child processes (timeout: 20 min, worker timeout: 25 min)\n0:17:30 [1/2/1] test_threading process crashed (Exit code 3)\nRe-running test_threading in verbose mode (matching: test_default_timeout)\ntest_default_timeout (test.test_threading.BarrierTests.test_default_timeout)\nTest the barrier's default timeout ... Warning -- Unraisable exception\nException ignored in thread started by: \u003cfunction Bunch.__init__.\u003clocals\u003e.task at 0x052196F0\u003e\nTraceback (most recent call last):\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 48, in task\n    f()\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1020, in f\n    i = barrier.wait()\n        ^^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 709, in wait\n    self._wait(timeout)\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 749, in _wait\n    raise BrokenBarrierError\nthreading.BrokenBarrierError: \nERROR\n\n======================================================================\nERROR: test_default_timeout (test.test_threading.BarrierTests.test_default_timeout)\nTest the barrier's default timeout\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1025, in test_default_timeout\n    self.run_threads(f)\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 854, in run_threads\n    f()\n  File \"D:\\a\\cpython\\cpython\\Lib\\test\\lock_tests.py\", line 1020, in f\n    i = barrier.wait()\n        ^^^^^^^^^^^^^^\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 709, in wait\n    self._wait(timeout)\n  File \"D:\\a\\cpython\\cpython\\Lib\\threading.py\", line 747, in _wait\n    raise BrokenBarrierError\nthreading.BrokenBarrierError\n\n----------------------------------------------------------------------\nRan 1 test in 0.376s\n\nFAILED (errors=1)\ntest test_threading failed\n\n{\"test_name\": \"test_threading\", \"state\": \"FAILED\", \"duration\": 0.6816820999999891, \"xml_data\": null, \"stats\": {\"tests_run\": 1, \"failures\": 0, \"skipped\": 0}, \"errors\": [[\"test_default_timeout (test.test_threading.BarrierTests.test_default_timeout)\", \"Traceback (most recent call last):\\n  File \\\"D:\\\\a\\\\cpython\\\\cpython\\\\Lib\\\\test\\\\lock_tests.py\\\", line 1025, in test_default_timeout\\n    self.run_threads(f)\\n  File \\\"D:\\\\a\\\\cpython\\\\cpython\\\\Lib\\\\test\\\\lock_tests.py\\\", line 854, in run_threads\\n    f()\\n  File \\\"D:\\\\a\\\\cpython\\\\cpython\\\\Lib\\\\test\\\\lock_tests.py\\\", line 1020, in f\\n    i = barrier.wait()\\n        ^^^^^^^^^^^^^^\\n  File \\\"D:\\\\a\\\\cpython\\\\cpython\\\\Lib\\\\threading.py\\\", line 709, in wait\\n    self._wait(timeout)\\n  File \\\"D:\\\\a\\\\cpython\\\\cpython\\\\Lib\\\\threading.py\\\", line 747, in _wait\\n    raise BrokenBarrierError\\nthreading.BrokenBarrierError\\n\"]], \"failures\": [], \"__test_result__\": \"TestResult\"}\nA�s�s�e�r�t�i�o�n� �f�a�i�l�e�d�:� �t�s�t�a�t�e�_�i�s�_�a�l�i�v�e�(�t�s�t�a�t�e�)� �\u0026�\u0026� �!�t�s�t�a�t�e�-�\u003e�_�s�t�a�t�u�s�.�b�o�u�n�d�,� �f�i�l�e� �D�:�\\�a�\\�c�p�y�t�h�o�n�\\�c�p�y�t�h�o�n�\\�P�y�t�h�o�n�\\�p�y�s�t�a�t�e�.�c�,� �l�i�n�e� �2�4�5�\n�Fatal Python error: Aborted\n\nThread 0x0000186c (most recent call first):\n  \u003cno Python frame\u003e\n1 test failed again:\n    test_threading\n```\n\nNote also UTF-16 in logs, but this is other issue.\n\nIt only happened in Windows (x86) run, the run on Windows (x64) passed successfully, as well as on other platforms. It may be 32-bit Windows specific or random.\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-109135\n* gh-109272\n* gh-110342\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/serhiy-storchaka","@type":"Person","name":"serhiy-storchaka"},"datePublished":"2023-09-06T09:45:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/108987/cpython/issues/108987"}