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

[Matthias Urlichs]

Matthias Urlichs <smurf at smurf.noris.de> added the comment:

Upon further consideration (and following the observation that my test cases no longer block for two seconds each after applying the first version of this patch): we do not want to clear the reference to "dangling_threads" since that's a weakset. We want to clear the "thread" variable, which holds a reference to a random member of that set, which will arbitrarily block the cleanup loop from ever succeeding.

Updated patch attached.

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Added file: https://bugs.python.org/file47446/gc.patch

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