[New-bugs-announce] [issue35686] memoryview contextmanager causing strange crash

[Thomas Waldmann]

New submission from Thomas Waldmann <thomas.j.waldmann at gmail.com>:

See there:

https://github.com/borgbackup/borg/pull/4247

I did the first changeset after seeing some strange exception popping up which it was handling another exception - which I assumed was related to memoryview.release not being called in the original code.

So it was clear to me, that we should use the CM there. So I added that (first changeset) and that made the code always fail (see first travis-ci link).

Then removed the CM again and replaced it with functionally equivalent try/finally (second changeset) - that worked.

So, the question is whether there is some issue in CPython's memoryview contextmanager code that make it fail in such a strange way.

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messages: 333236
nosy: Thomas.Waldmann
priority: normal
severity: normal
status: open
title: memoryview contextmanager causing strange crash
type: crash
versions: Python 3.5, Python 3.6, Python 3.7

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<https://bugs.python.org/issue35686>
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