Chris Jerdonek <chris.jerdo...@gmail.com> added the comment:

> This issue is not solved.

Yes, nothing was changed. After diagnosing this issue and trying some things 
out in a draft PR, my conclusion is that an asyncio maintainer really needs to 
weigh in on what to do (especially Andrew who authored the class). The reason 
is that the hang is closely tied to MultiLoopChildWatcher's documented purpose. 
The only way I could see to fix MultiLoopChildWatcher would change its 
documented behavior and make it the same as SafeChildWatcher, which would 
defeat the purpose of having a separate class: 
https://github.com/python/cpython/pull/20142#issuecomment-712417912
Maybe there is a way to sidestep the hangs in the tests without fixing 
MultiLoopChildWatcher, but I didn't look into that.

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<https://bugs.python.org/issue38323>
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