[issue37380] subprocess.Popen._cleanup() "The handle is invalid" error when some old process is gone

[Steve Dower]

Change by Steve Dower <steve.dower at python.org>:


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stage: patch review -> backport needed
versions: +Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37380>
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