8000 local_clear walks the list of threads without holding head_lock. · Issue #67753 · python/cpython · GitHub
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local_clear walks the list of threads without holding head_lock. #67753

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stutzbach mannequin opened this issue Mar 2, 2015 · 3 comments
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local_clear walks the list of threads without holding head_lock. #67753

stutzbach mannequin opened this issue Mar 2, 2015 · 3 comments
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stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@stutzbach
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stutzbach mannequin commented Mar 2, 2015
BPO 23565
Nosy @pitrou, @vstinner

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 2015-03-02.19:45:23.282>
labels = ['type-bug', 'library']
title = 'local_clear walks the list of threads without holding head_lock.'
updated_at = <Date 2021-06-18.23:26:27.957>
user = 'https://bugs.python.org/stutzbach'

bugs.python.org fields:

activity = <Date 2021-06-18.23:26:27.957>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2015-03-02.19:45:23.282>
creator = 'stutzbach'
dependencies = []
files = []
hgrepos = []
issue_num = 23565
keywords = []
message_count = 1.0
messages = ['237078']
nosy_count = 3.0
nosy_names = ['pitrou', 'vstinner', 'stutzbach']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue23565'
versions = []
@stutzbach
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stutzbach mannequin commented Mar 2, 2015

local_clear in _threadmodule.c walks the list of threads without holding head_mutex. Since the list of threads can change when holding only head_mutex and not on the GIL, the list can change while local_clear is executing, which may cause Bad Things to happen.

@stutzbach stutzbach mannequin added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Mar 2, 2015
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
@iritkatriel
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@kumaraditya303 is this the same issue you fixed in #100892?

@kumaraditya303
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Yes

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stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error
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