GeezerVison is showing github.com — Segfault on recursive itertools.chain.from_iterable · Issue #67100 · python/cpython

Segfault on recursive itertools.chain.from_iterable #67100

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Segfault on recursive itertools.chain.from_iterable#67100

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stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

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ikelly

mannequin

opened

on Nov 21, 2014

Issue body actions

BPO	22911
Nosy	@serhiy-storchaka
Superseder	bpo-14010: deeply nested itertools objects segfault

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2014-11-21.19:08:29.798>
created_at = <Date 2014-11-21.18:42:52.569>
labels = ['library']
title = 'Segfault on recursive itertools.chain.from_iterable'
updated_at = <Date 2014-11-21.19:08:29.796>
user = 'https://bugs.python.org/ikelly'

bugs.python.org fields:

activity = <Date 2014-11-21.19:08:29.796>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2014-11-21.19:08:29.798>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2014-11-21.18:42:52.569>
creator = 'ikelly'
dependencies = []
files = []
hgrepos = []
issue_num = 22911
keywords = []
message_count = 2.0
messages = ['231489', '231491']
nosy_count = 2.0
nosy_names = ['ikelly', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '14010'
type = None
url = 'https://bugs.python.org/issue22911'
versions = ['Python 3.4']

Activity

ikelly commented on Nov 21, 2014
ikellymannequin
on Nov 21, 2014
MannequinAuthor
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I expect this should result in a recursion depth exceeded error, not a segmentation fault.

$ cat test.py import itertools

l = [] it = itertools.chain.from_iterable(l) l.append(it) next(it) $ python3 test.py Segmentation fault (core dumped)
ikelly
added
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
on Nov 21, 2014
serhiy-storchaka commented on Nov 21, 2014
serhiy-storchaka
on Nov 21, 2014
Member
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This is a duplicate of bpo-14010.
serhiy-storchaka
closed this as completed on Nov 21, 2014
ezio-melotti
transferred this issue from on Apr 10, 2022
picnixz
closed this as a duplicateof deeply nested itertools objects segfault #58218 on Aug 18, 2025
markshannon commented on Jul 29, 2026
markshannon
on Jul 29, 2026
Member
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This was not a duplicate of bpo-14010 as that related to the trashcan mechanism. This still crashes the VM.