[issue45128] test_multiprocessing fails sporadically on the release artifacts

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Minimum command to reproduce the issue (on Linux):

$ ./python -m test -m test.test_logging.LogRecordTest.test_multiprocessing test_genericalias test_logging test_multiprocessing_fork -v

(...)
0:00:00 load avg: 0.45 Run tests sequentially
0:00:00 load avg: 0.45 [1/3] test_genericalias

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK
0:00:00 load avg: 0.49 [2/3] test_logging -- test_genericalias ran no tests
test_multiprocessing (test.test_logging.LogRecordTest) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.008s

OK
0:00:00 load avg: 0.49 [3/3] test_multiprocessing_fork
test test_multiprocessing_fork crashed -- Traceback (most recent call last):
  File "/home/vstinner/python/main/Lib/test/libregrtest/runtest.py", line 340, in _runtest_inner
    refleak = _runtest_inner2(ns, test_name)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vstinner/python/main/Lib/test/libregrtest/runtest.py", line 280, in _runtest_inner2
    the_module = importlib.import_module(abstest)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vstinner/python/main/Lib/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1072, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1044, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1015, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 689, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 894, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/vstinner/python/main/Lib/test/test_multiprocessing_fork.py", line 2, in <module>
    import test._test_multiprocessing
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vstinner/python/main/Lib/test/_test_multiprocessing.py", line 5374, in <module>
    class TestSyncManagerTypes(unittest.TestCase):
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vstinner/python/main/Lib/test/_test_multiprocessing.py", line 5396, in TestSyncManagerTypes
    manager_class = multiprocessing.managers.SyncManager
                    ^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'multiprocessing' has no attribute 'managers'

test_multiprocessing_fork failed (uncaught exception)
(...)

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_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45128>
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