New submission from STINNER Victor <vstin...@redhat.com>:

It seems like Python has an invalid object somewhere. PYTHONDUMPREFS=1 makes 
Python crash at exit.

$ PYTHONDUMPREFS=1 ./python -c pass
(...)
0x7f1992292448 [1] (<class '_thread._localdummy'>, <class 'object'>)
0x7f1992241aa8 [1] {'__doc__': 'Thread-local dummy'}
0x7f199222c740 [1] (<class 'object'>,)
0x9c98a0 [2] <class '_thread._localdummy'>
0x7f1992217dc0 [1] 
Segmentation fault (core dumped)

----------
components: Interpreter Core
messages: 322353
nosy: vstinner
priority: normal
severity: normal
status: open
title: PYTHONDUMPREFS=1 ./python -c pass does crash
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34223>
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