New submission from Oren Milman:
The following code causes an assertion failure on Windows:
class BadEnv(dict):
keys = None
import subprocess
import sys
subprocess.Popen([sys.executable, "-c", "pass"], env=BadEnv())
this is because getenvironment() (in Modules/_winapi.c) calls PyMapping_Values()
immediately after calling PyMapping_Keys().
calling PyMapping_Values() ultimately leads to calling _PyObject_FastCallDict(),
which does 'assert(!PyErr_Occurred());'.
thus, in case of an error in PyMapping_Keys(), the assertion fails.
----------
components: Extension Modules
messages: 302181
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: assertion failure in subprocess.Popen() in case the env arg has a bad
keys() method
type: crash
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31471>
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