[issue45021] Race condition in thread.py

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

As the multiprocessing doc says (https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods):
"""Note that safely forking a multithreaded process is problematic."""

The reproducer is trivially fixed by adding a call to `multiprocessing.set_start_method("forkserver")` (you can also replace "forkserver" with "spawn")

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45021>
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