Dong-hee Na <donghee.n...@gmail.com> added the comment:

This cause of failure PR 17010 was due to change of start methods as follows:
https://docs.python.org/3/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.


So I updated the test through PR 17154 and I check that my local mac machine 
works well. (I did not check it on my local mac machine when I submitted PR 
17010 since open description lock was Linux feature, this was my mistake)

And thanks to the tip from Michael Felt, I update the test to skip on the AIX 
machine. So I expect that when PR 17154 is landed, everything will go well.

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<https://bugs.python.org/issue38790>
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