Mutlithread XML parsing cause segfault

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
backend

Research direction

Start with the attached pyexpat_crash_multithread.py reproduction and inspect the pyexpat XML component it exercises. Run the script in a threaded setup to confirm the segfault, then trace the relevant parser behavior and add or update a regression test that demonstrates the corrected result without a crash.

Written by the indexing model from the issue text.

Description

3.10 3.11 3.12 topic-XML type-crash
BPO 17970
Nosy @amauryfa, @pitrou, @tiran, @alex, @iritkatriel
Files
  • pyexpat_crash_multithread.py: pyexpat test
    		•

    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 = None
created_at = <Date 2013-05-13.13:52:38.896>
labels = ['expert-XML', '3.10', '3.9', 'type-crash', '3.11']
title = 'Mutlithread XML parsing cause segfault'
updated_at = <Date 2021-09-07.12:55:23.850>
user = 'https://bugs.python.org/mrDoctorWho0'

    bugs.python.org fields:

    activity = <Date 2021-09-07.12:55:23.850>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['XML']
creation = <Date 2013-05-13.13:52:38.896>
creator = 'mrDoctorWho0..'
dependencies = []
files = ['30250']
hgrepos = []
issue_num = 17970
keywords = []
message_count = 8.0
messages = ['189131', '189159', '189161', '189162', '189225', '189232', '189533', '401257']
nosy_count = 6.0
nosy_names = ['amaury.forgeotdarc', 'pitrou', 'christian.heimes', 'alex', 'mrDoctorWho0..', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue17970'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

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