New submission from Evgeny Kapun:
Implementations of repr for some of the types in the standard library doesn't
check for self-referential structures. As a result, when calling repr() on such
objects, Python crashes due to infinite recursion.
Example:
>>> import functools
>>> x = functools.partial(min)
>>> x.__setstate__((x, (), {}, {}))
>>> repr(x)
Segmentation fault
Another example:
>>> import xml.etree.ElementTree
>>> x = xml.etree.ElementTree.Element('')
>>> x.tag = x
>>> repr(x)
Segmentation fault
One more example:
>>> import io
>>> class X(io.TextIOWrapper): __slots__ = 'name'
>>> x = X(open('/dev/null'))
>>> x.name = x
>>> repr(x)
Segmentation fault
----------
components: Extension Modules
messages: 253309
nosy: abacabadabacaba
priority: normal
severity: normal
status: open
title: Some repr implementations don't check for self-referential structures
type: crash
versions: Python 3.5, Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25455>
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