[issue25429] Can segfault Python with itertools.chain.from_iterable

[Zachary Ware]

Changes by Zachary Ware :


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stage:  -> resolved

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[issue25429] Can segfault Python with itertools.chain.from_iterable

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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superseder:  -> deeply nested filter segfaults

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[issue25429] Can segfault Python with itertools.chain.from_iterable

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Actually this issue an exact duplicate of issue22911 that is a duplicate of 
issue14010.

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nosy: +serhiy.storchaka

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[issue25429] Can segfault Python with itertools.chain.from_iterable

[Raymond Hettinger]

Raymond Hettinger added the comment:

This is a duplicate of Issue #14010.  This issue runs deep and isn't itertools 
specific.  Running infinite chains of iterators pushes a number of CPython 
internals past their limits.  The best solutions are hard (monitoring the 
C-stack or fixing every possible fault at the fracture point).  The simplest 
solution (adding recursion count tracking to every possible iteration)is very 
heavy-handed and would slow-down all of Python in order to spare exotic cases 
that don't seem to arise in practice.

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resolution:  -> duplicate
status: open -> closed

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[issue25429] Can segfault Python with itertools.chain.from_iterable

[Josh Rosenberg]

Josh Rosenberg added the comment:

Also crashes in 3.5.0 (on Windows 7, with 64 bit build).

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nosy: +josh.r

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[issue25429] Can segfault Python with itertools.chain.from_iterable

[Zachary Ware]

Changes by Zachary Ware :


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assignee:  -> rhettinger
components: +Extension Modules
nosy: +rhettinger
versions: +Python 3.5, Python 3.6 -Python 3.2, Python 3.3

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[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.

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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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