[issue37135] test_multiprocessing_spawn segfaults on AMD64 FreeBSD CURRENT Shared 3.x

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> FTR Victor reverted GH-13714 that triggers this.

Sadly, this revert wasn't enough. New fresh coredump on "AMD64 FreeBSD CURRENT Shared 3.x":
https://buildbot.python.org/all/#builders/168/builds/1145

Warning -- Dangling processes: {<SpawnProcess
name='SharedMemoryManager-313' pid=12404 parent=11647 started>}
Warning -- Dangling processes: {<SpawnProcess
name='SharedMemoryManager-313' pid=12404 parent=11647 started>}
Warning -- multiprocessing.process._dangling was modified by
test_multiprocessing_spawn
  Before: set()
  After:  {<weakref at 0x80273a890; to 'SpawnProcess' at 0x8029f6b40>}
Warning -- files was modified by test_multiprocessing_spawn
  Before: []
  After:  ['python.core']

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