Jack DeVries <jdevries3...@gmail.com> added the comment:
I've identified the first bad commit with git-bisect:
commit b61b818d916942aad1f8f3e33181801c4a1ed14b
Author: Kyle Stanley <aeros...@gmail.com>
Date: Fri Mar 27 15:31:22 2020 -0400
bpo-39812: Remove daemon threads in concurrent.futures (GH-19149)
Remove daemon threads from :mod:`concurrent.futures` by adding
an internal `threading._register_atexit()`, which calls registered functions
prior to joining all non-daemon threads. This allows for compatibility
with subinterpreters, which don't support daemon threads.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43944>
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