New submission from Zuzu_Typ <zuzu....@gmail.com>:

Using the C-API, the inplace_pow numbermethod is always called with the third 
argument pointing to an invalid address.

The reason is likely that self.__ipow__ only takes one argument, resulting in a 
binaryfunc (self, arg), though inplace_pow is a ternaryfunc.
When trying to use the third argument in any way, Python crashes.

The third arg should be nonexistent, NULL or Py_None.

----------
components: Build, Extension Modules
messages: 338458
nosy: Zuzu_Typ
priority: normal
severity: normal
status: open
title: nb_inplace_pow is always called with an invalid argument
type: crash
versions: Python 2.7, Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36379>
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