Ned Deily <n...@python.org> added the comment:

Also note that there are known problems with using the "fork" start method of 
multiprocessing on macOS. As of Python 3.8, the default start methord on macOS 
is now "spawn":

https://docs.python.org/3.9/library/multiprocessing.html#contexts-and-start-methods

Try using "spawn" and/or upgrade to a more recent version of Python 3 (3.9.1 is 
current).

----------
nosy: +ned.deily

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<https://bugs.python.org/issue42850>
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