STINNER Victor added the comment:
The warning is a race condition which can be reproduced easily on Linux using
attached test_handle_called_with_mp_queue-bug.patch, run:
haypo@selma$ ./python -m test --fail-env-changed -m
test_handle_called_with_mp_queue test_logging
Run tests sequentially
0:00:00 load avg: 0.22 [1/1] test_logging
Warning -- threading_cleanup() failed to cleanup 20 threads after 0 sec (count:
20, dangling: 21)
Warning -- threading._dangling was modified by test_logging
Before: <_weakrefset.WeakSet object at 0x7fe1df5302c8>
After: <_weakrefset.WeakSet object at 0x7fe1df5338e0>
test_logging failed (env changed)
1 test altered the execution environment:
test_logging
Total duration: 718 ms
Tests result: ENV CHANGED
----------
keywords: +patch
Added file:
http://bugs.python.org/file46999/test_handle_called_with_mp_queue-bug.patch
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<http://bugs.python.org/issue30886>
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