Serhiy Storchaka added the comment:
Here is simpler reproducer:
import codecs
class X(str):
__class__ = UnicodeEncodeError
codecs.ignore_errors(X())
The problem is that PyObject_IsInstance() is fooled by custom __class__, but
then builtin error handlers handle error object as having UnicodeEncodeError
layout, while it doesn't.
Here is a patch that fixes the issue by using PyObject_IsSubclass() of
exc->ob_type instead of PyObject_IsInstance().
----------
assignee: -> serhiy.storchaka
stage: needs patch -> patch review
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24102>
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