Rémi Lapeyre <remi.lape...@henki.fr> added the comment:

Hi, I got bit by this bug last week, I wrote an example that reproduce the 
basic idea of our program main loop and it hangs

 - around 20% of the time with a release build of Python 3.7.4
 - around 6% of the time with a debug build of Python 3.7, 3.8 and 3.9

With some of our inputs, it hangs nearly all the time but I cannot post them 
here.

I tested PR 8009 and it solves the issue. It seems to me that it is an 
appropriate fix for this.

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Added file: https://bugs.python.org/file48531/multiprocessing_hangs.py

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<https://bugs.python.org/issue33997>
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