STINNER Victor <vstin...@redhat.com> added the comment:

See bpo-33725 and multiprocessing documentation:
https://docs.python.org/dev/library/multiprocessing.html#contexts-and-start-methods

"Changed in version 3.8: On macOS, the spawn start method is now the default. 
The fork start method should be considered unsafe as it can lead to crashes of 
the subprocess. See bpo-33725."

Change the start method to spawn.

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nosy: +vstinner

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37607>
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