[issue42097] Python 3.7.9 logging/threading/fork hang

[Andrew de Quincey]

Andrew de Quincey <Adq at tvsquared.com> added the comment:

Before anyone suggests it might be the logstash code we're calling in the comment, it ain't. 

The bug is easily replicated using entirely python built in code. See test.py attached.

If you're having trouble triggering it (seems to vary per machine), find:
        pl.map(do_work, range(10000))

And add a few zeros into the range()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42097>
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