[New-bugs-announce] [issue31687] test_semaphore_tracker() of test_multiprocessing_spawn fails randomly (race condition?)

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at gmail.com>:

Recent example of the slow and busy (load of 8.05 with 2 CPUs) x86 Gentoo Refleaks 3.6 buildbot:

http://buildbot.python.org/all/builders/x86%20Gentoo%20Refleaks%203.6/builds/111/steps/test/logs/stdio

== CPU count: 2
...
1:41:09 load avg: 8.05 [170/405/1] test_multiprocessing_spawn failed -- running: test_asyncio (1118 sec)
beginning 6 repetitions
123456
/buildbot/buildarea/3.6.ware-gentoo-x86.refleak/build/Lib/unittest/case.py:633: ResourceWarning: unclosed file <_io.BufferedReader name=22>
  outcome.errors.clear()
test test_multiprocessing_spawn failed -- Traceback (most recent call last):
  File "/buildbot/buildarea/3.6.ware-gentoo-x86.refleak/build/Lib/test/_test_multiprocessing.py", line 4091, in test_semaphore_tracker
    _multiprocessing.sem_unlink(name2)
AssertionError: OSError not raised
1:41:12 load avg: 7.97 [171/405/1] test_posixpath passed -- running: test_asyncio (1122 sec)
beginning 6 repetitions
123456
......

----------
components: Tests
messages: 303678
nosy: haypo
priority: normal
severity: normal
status: open
title: test_semaphore_tracker() of test_multiprocessing_spawn fails randomly (race condition?)
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31687>
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