[New-bugs-announce] [issue25429] Can segfault Python with itertools.chain.from_iterable

[Evan Hubinger]

New submission from Evan Hubinger:

The code

import itertools
it = itertools.chain.from_iterable((f() for f in [lambda: it]))
list(it)

definitely segfaults on Python 2.6, 2.7, 3.3, and 3.4, and probably segfaults on other versions as well. The code is clearly incorrect in that the lambda references the variable being defined, but it seems like it should raise an error instead of segfaulting.

----------
messages: 253112
nosy: Evan Hubinger
priority: normal
severity: normal
status: open
title: Can segfault Python with itertools.chain.from_iterable
type: crash
versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25429>
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