Eryk Sun <eryk...@gmail.com> added the comment:
It's not a subprocess bug, per se. It's due to creating the stdout/stderr
worker threads from the __del__ finalizer while the interpreter is shutting
down. Minimal reproducer, confirmed in both Linux and Windows:
import threading
class C:
def __del__(self):
t = threading.Thread(target=print, args=('spam',), daemon=True)
t.start()
c = C()
#del c # uncomment to prevent hanging
----------
components: -Windows
nosy: +eryksun
title: [Windows] interpreter hangs indefinitely on subprocess.communicate
during __del__ at script exit -> starting a thread in __del__ hangs at
interpreter shutdown
type: -> behavior
versions: +Python 3.10, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43784>
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