[issue32850] Run gc_collect() before complaining about dangling threads

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> This is not useful, esp. when the list of referrers to the "dangling" thread looks like this: (...)

I wrote the test.bisect tool to help to debug dangling threads issues.

Sadly, sometimes the warning can occur randomly because of race conditions, and it can be painful to reproduce the bug, and to fix the root issues.

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<https://bugs.python.org/issue32850>
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