[issue38448] test_concurrent_futures: reap_children() reaped child process 26487 on AMD64 RHEL8 Refleaks 3.x

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

AMD64 RHEL8 Refleaks 3.x:
https://buildbot.python.org/all/#/builders/272/builds/23

0:27:13 load avg: 4.88 [416/419/1] test_concurrent_futures failed (env changed) (17 min 11 sec) -- running: test_capi (7 min 28 sec), test_gdb (8 min 49 sec), test_asyncio (23 min 23 sec)
beginning 6 repetitions
123456
.Warning -- reap_children() reaped child process 26487
.....
Warning -- multiprocessing.process._dangling was modified by test_concurrent_futures
  Before: set()
  After:  {<weakref at 0x7fdc08f44e30; to 'SpawnProcess' at 0x7fdc0a467c30>}

----------
components: Tests
messages: 354448
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_concurrent_futures: reap_children() reaped child process 26487 on AMD64 RHEL8 Refleaks 3.x
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38448>
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