[issue35866] concurrent.futures deadlock

[Jakub Wilk]

New submission from Jakub Wilk <jwilk at jwilk.net>:

The attached test program hangs eventually (it may need a few thousand of iterations).

Tested with Python v3.7.2 on Linux, amd64.

----------
components: Library (Lib)
files: cf-deadlock.py
messages: 334618
nosy: jwilk
priority: normal
severity: normal
status: open
title: concurrent.futures deadlock
type: behavior
versions: Python 3.7
Added file: https://bugs.python.org/file48090/cf-deadlock.py

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<https://bugs.python.org/issue35866>
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