New submission from STINNER Victor <vstin...@python.org>:

Sadly, faulthandler failed to dump the Python traceback and kill the process. 
Instead, the main libregrtest process had to kill the child process (process 
group) :-(

https://buildbot.python.org/all/#/builders/152/builds/420

...
0:56:25 load avg: 0.22 running: test_multiprocessing_fork (35 min 42 sec)
0:56:55 load avg: 0.40 running: test_multiprocessing_fork (36 min 12 sec)
0:57:25 load avg: 0.24 running: test_multiprocessing_fork (36 min 42 sec)
0:57:55 load avg: 0.25 running: test_multiprocessing_fork (37 min 12 sec)
Kill <TestWorkerProcess #4 running test=test_multiprocessing_fork pid=58534 
time=37 min 30 sec> process group
0:58:13 load avg: 0.24 [420/420/3] test_multiprocessing_fork timed out (37 min 
30 sec) (37 min 30 sec)

See also bpo-39995: test_concurrent_futures.test_ressources_gced_in_workers() 
timed out after 15 minutes on AMD64 Ubuntu Shared 3.x.

----------
components: Tests
messages: 364464
nosy: koobs, vstinner
priority: normal
severity: normal
status: open
title: test_multiprocessing_fork hangs on AMD64 FreeBSD Shared 3.x
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39996>
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