memoryview to freed memory can cause segfault

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
15/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
backend

Research direction

Start by reviewing the referenced release-view.patch and the linked PR gh-105290, then inspect the issue's memoryview and freed-memory behavior. Done means the reported use of a memoryview after its underlying memory is freed no longer causes a segmentation fault, with the relevant regression covered.

Written by the indexing model from the issue text.

Description

3.13 3.14 3.15 extension-modules topic-IO topic-unicode type-crash
BPO 15994
Nosy @gpshead, @jcea, @vstinner, @tiran, @ezio-melotti, @methane, @skrah, @vadmium, @taralx
Files
  • release-view.patch
    		•

    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 2012-09-20.20:37:21.249>
labels = ['3.8', 'expert-unicode', '3.7', 'expert-IO', 'type-crash']
title = 'memoryview to freed memory can cause segfault'
updated_at = <Date 2019-04-08.13:02:28.778>
user = 'https://bugs.python.org/sbt'

    bugs.python.org fields:

    activity = <Date 2019-04-08.13:02:28.778>
actor = 'methane'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Unicode', 'IO']
creation = <Date 2012-09-20.20:37:21.249>
creator = 'sbt'
dependencies = []
files = ['42503']
hgrepos = []
issue_num = 15994
keywords = ['patch']
message_count = 7.0
messages = ['170846', '223224', '223406', '253774', '253796', '263245', '263664']
nosy_count = 12.0
nosy_names = ['gregory.p.smith', 'jcea', 'vstinner', 'christian.heimes', 'ezio.melotti', 'Arfrever', 'methane', 'skrah', 'abacabadabacaba', 'sbt', 'martin.panter', 'taralx']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue15994'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

    Linked PRs
    • gh-105290
    Dominant language
    Python
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    Forks
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    Avg merge
    1d 9h
    Merged PRs (30d)
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