[issue31783] Race condition in ThreadPoolExecutor when scheduling new jobs while the interpreter shuts down

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

Brian, should this fix be backported to 3.8 and 3.7?  As it stands now, it will only be showing up in Python 3.9 unless you add the backport labels to the original PR.  Unless it cna be shown to be a security issue, it would not be appropriate to backport to 3.6 at this stage.

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nosy: +ned.deily

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<https://bugs.python.org/issue31783>
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