[New-bugs-announce] [issue43065] 'concurrent.futures' stucks in 3.9.1

[doublex]

New submission from doublex <doppelbauer at gmx.net>:

Works with python 3.8
Fails with 3.9.1 (tested on CentOS 7 and Ubuntu 2004)
Yes, sometimes is does not stuck...

Command-line: 
python3.9 stuck.py

----------
components: Interpreter Core
files: stuck.py
messages: 385931
nosy: doublex
priority: normal
severity: normal
status: open
title: 'concurrent.futures' stucks in 3.9.1
type: resource usage
versions: Python 3.9
Added file: https://bugs.python.org/file49775/stuck.py

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<https://bugs.python.org/issue43065>
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