[issue39599] ABI breakage between 3.7.4 and 3.7.5

[Julien Danjou]

New submission from Julien Danjou <julien at danjou.info>:

As I've reported originally on the python-dev list, there seems to be an ABI breakage between 3.7.4 and 3.7.5.

https://mail.python.org/archives/list/python-dev@python.org/message/J2FGZPS5PS7473TONJTPAVSNXRGV3TFL/

The culprit commit is https://github.com/python/cpython/commit/8766cb74e186d3820db0a855ccd780d6d84461f7

This happens on a custom C module (built via Cython) when using including <internal/pystate.h> with -DPy_BUILD_CORE. I'm not sure it'd happen otherwise.

I've tried to provide a minimal use case, but since it seems to be a memory overflow, the backtrace does not make any sense and it's hard to reproduce without the orignal code.

----------
components: C API
messages: 361689
nosy: jd
priority: normal
severity: normal
status: open
title: ABI breakage between 3.7.4 and 3.7.5
versions: Python 3.7

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<https://bugs.python.org/issue39599>
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