New submission from STINNER Victor <vstin...@python.org>:
Sometimes, I need to run multiprocessing tests multiple times in parallel to attempt to reproduce a race condition. Except that test_shared_memory_across_processes() fails in this case: $ ./python -m test test_multiprocessing_spawn --fail-env-changed -v -j4 -F -m test_shared_memory_across_processes == CPython 3.9.0a5+ (heads/master:17b4733f2f, Apr 1 2020, 15:02:04) [GCC 9.2.1 20190827 (Red Hat 9.2.1-1)] == Linux-5.5.9-200.fc31.x86_64-x86_64-with-glibc2.30 little-endian == cwd: /home/vstinner/python/master/build/test_python_1133450 == CPU count: 8 == encodings: locale=UTF-8, FS=utf-8 0:00:00 load avg: 1.64 Run tests in parallel using 4 child processes 0:00:01 load avg: 1.64 [ 1/1] test_multiprocessing_spawn failed test_shared_memory_across_processes (test.test_multiprocessing_spawn.WithProcessesTestSharedMemory) ... ERROR ====================================================================== ERROR: test_shared_memory_across_processes (test.test_multiprocessing_spawn.WithProcessesTestSharedMemory) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/vstinner/python/master/Lib/test/_test_multiprocessing.py", line 3862, in test_shared_memory_across_processes sms = shared_memory.SharedMemory('test02_tsmap', True, size=512) File "/home/vstinner/python/master/Lib/multiprocessing/shared_memory.py", line 100, in __init__ self._fd = _posixshmem.shm_open( FileExistsError: [Errno 17] File exists: '/test02_tsmap' ---------------------------------------------------------------------- Ran 1 test in 0.247s FAILED (errors=1) test test_multiprocessing_spawn failed Kill <TestWorkerProcess #2 running test=test_multiprocessing_spawn pid=1133458 time=1.2 sec> process group Kill <TestWorkerProcess #3 running test=test_multiprocessing_spawn pid=1133457 time=1.2 sec> process group Kill <TestWorkerProcess #4 running test=test_multiprocessing_spawn pid=1133459 time=1.2 sec> process group == Tests result: FAILURE == 1 test failed: test_multiprocessing_spawn Total duration: 1.2 sec Tests result: FAILURE ---------- components: Tests messages: 365462 nosy: vstinner priority: normal severity: normal status: open title: multiprocessing: test_shared_memory_across_processes() cannot be run twice in parallel versions: Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40135> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com