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Issue33078

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classification
Title:Queue with maxsize can lead to deadlocks
Type:behaviorStage:resolved
Components:Library (Lib)Versions:Python 3.8, Python 3.7
process
Status:closedResolution:fixed
Dependencies:Superseder:
Assigned To:Nosy List: davin, ned.deily, pitrou, tomMoral
Priority:normalKeywords:patch

Created on2018-03-15 06:36 bytomMoral, last changed2022-04-11 14:58 byadmin. This issue is nowclosed.

Pull Requests
URLStatusLinkedEdit
PR 6119mergedtomMoral,2018-03-15 06:42
PR 6178mergedmiss-islington,2018-03-21 15:51
PR 6180mergedtomMoral,2018-03-21 17:01
Messages (7)
msg313855 -(view)Author: Thomas Moreau (tomMoral)*Date: 2018-03-15 06:36
The fix for the Queue._feeder does not properly handle the size of the Queue. This can lead to a situation where the Queue is considered as Full when it is empty. Here is a reproducing script:```import multiprocessing as mpq = mp.Queue(1)class FailPickle():    def __reduce__(self):        raise ValueError()q.put(FailPickle())print("Queue is full:", q.full())q.put(0)print(f"Got result: {q.get()}")```
msg314208 -(view)Author: Antoine Pitrou (pitrou)*(Python committer)Date: 2018-03-21 15:50
New changesete2f33add635df4fde81be9960bab367e010c19bf by Antoine Pitrou (Thomas Moreau) in branch 'master':bpo-33078 - Fix queue size on pickling error (GH-6119)https://github.com/python/cpython/commit/e2f33add635df4fde81be9960bab367e010c19bf
msg314210 -(view)Author: Antoine Pitrou (pitrou)*(Python committer)Date: 2018-03-21 16:21
New changesetbb5b5291971c104ea773db1a30e46d410b6b3e1e by Antoine Pitrou (Miss Islington (bot)) in branch '3.7':bpo-33078 - Fix queue size on pickling error (GH-6119) (GH-6178)https://github.com/python/cpython/commit/bb5b5291971c104ea773db1a30e46d410b6b3e1e
msg314211 -(view)Author: Ned Deily (ned.deily)*(Python committer)Date: 2018-03-21 16:36
Buildbots are failing on macOS:http://buildbot.python.org/all/#/builders/14/builds/804/steps/4/logs/stdiohttp://buildbot.python.org/all/#/builders/93/builds/459/steps/4/logs/stdio
msg314219 -(view)Author: Ned Deily (ned.deily)*(Python committer)Date: 2018-03-21 18:58
PR 6180 appears to have fixed the 3.x failures, thanks!
msg314221 -(view)Author: Antoine Pitrou (pitrou)*(Python committer)Date: 2018-03-21 19:01
Good, I think we can close again now!
msg314224 -(view)Author: Ned Deily (ned.deily)*(Python committer)Date: 2018-03-21 21:27
(Fot the record,PR 6181 was the 3.7 backport ofPR 6180.)
History
DateUserActionArgs
2022-04-11 14:58:58adminsetgithub: 77259
2018-03-21 21:27:09ned.deilysetmessages: +msg314224
2018-03-21 19:01:57pitrousetstatus: open -> closed
resolution: fixed
messages: +msg314221

stage: patch review -> resolved
2018-03-21 18:58:34ned.deilysetmessages: +msg314219
2018-03-21 17:01:55tomMoralsetstage: needs patch -> patch review
pull_requests: +pull_request5929
2018-03-21 16:36:17ned.deilysetstatus: closed -> open

nosy: +ned.deily
messages: +msg314211

resolution: fixed -> (no value)
stage: resolved -> needs patch
2018-03-21 16:21:33pitrousetstatus: open -> closed
resolution: fixed
stage: patch review -> resolved
2018-03-21 16:21:19pitrousetmessages: +msg314210
2018-03-21 15:51:02miss-islingtonsetpull_requests: +pull_request5928
2018-03-21 15:50:52pitrousetversions: - Python 2.7, Python 3.5, Python 3.6
2018-03-21 15:50:35pitrousetmessages: +msg314208
2018-03-15 06:42:27tomMoralsetkeywords: +patch
stage: patch review
pull_requests: +pull_request5883
2018-03-15 06:36:54tomMoralcreate
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