[issue36114] test_multiprocessing_spawn: WithProcessesTestSharedMemory dumps core in AMD64 FreeBSD CURRENT Shared 3.x

[STINNER Victor]

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

Sometimes, I can reproduce the crash using:
./python -m test --matchfile=bisect5 test_multiprocessing_spawn --fail-env-changed -F

Using this file:

test.test_multiprocessing_spawn.WithThreadsTestQueue.test_timeout
test.test_multiprocessing_spawn.WithProcessesTestBarrier.test_default_timeout
test.test_multiprocessing_spawn.WithThreadsTestManagerRestart.test_rapid_restart
test.test_multiprocessing_spawn.WithProcessesTestPool.test_release_task_refs
test.test_multiprocessing_spawn.WithManagerTestLock.test_rlock

It seems like the following test is enough to creates a coredump:

test.test_multiprocessing_spawn.WithThreadsTestManagerRestart.test_rapid_restart

Problem: it's really hard to write a *reliable* script/method to trigger the crash. This race condition is very well hidden!

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<https://bugs.python.org/issue36114>
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