AssertionError from asyncio Queue get

[gvanrossum]

BPO	25233
Nosy	@gvanrossum, @vstinner, @1st1

^{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 = 'https://github.com/gvanrossum'
closed_at = <Date 2015-09-29.04:03:36.487>
created_at = <Date 2015-09-25.17:27:20.791>
labels = ['type-bug', 'release-blocker', 'expert-asyncio']
title = 'AssertionError from asyncio Queue get'
updated_at = <Date 2015-09-29.04:03:36.486>
user = 'https://github.com/gvanrossum'

bugs.python.org fields:

activity = <Date 2015-09-29.04:03:36.486>
actor = 'gvanrossum'
assignee = 'gvanrossum'
closed = True
closed_date = <Date 2015-09-29.04:03:36.487>
closer = 'gvanrossum'
components = ['asyncio']
creation = <Date 2015-09-25.17:27:20.791>
creator = 'gvanrossum'
dependencies = []
files = []
hgrepos = []
issue_num = 25233
keywords = ['3.5regression']
message_count = 6.0
messages = ['251590', '251591', '251604', '251649', '251770', '251798']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'vstinner', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25233'
versions = ['Python 3.5']

[gvanrossum]

See python/asyncio#265 and python/asyncio#268. This looks like an important regression and we should fix it before 3.5.1 goes out.

The symptom is "AssertionError: queue non-empty, why are getters waiting?" from Queue.get or Queue.get_nowait. The first issue discusses the cause and a possible hack to fix it.

[1st1]

This looks like an important regression and we should fix it before 3.5.1 goes out.

I agree. Any ETA on 3.5.1?

[vstinner]

2015-09-25 20:12 GMT+02:00 Yury Selivanov <report@bugs.python.org>:

> This looks like an important regression and we should fix it before 3.5.1 goes out.

I agree. Any ETA on 3.5.1?

See https://mail.python.org/pipermail/python-dev/2015-September/141705.html

[gvanrossum]

I have a fix pending here: python/asyncio#269

[python-dev]

New changeset 1ea306202d5d by Guido van Rossum in branch '3.4':
Issue bpo-25233: Rewrite the guts of Queue to be more understandable and correct.
https://hg.python.org/cpython/rev/1ea306202d5d

New changeset a48d90049ae2 by Guido van Rossum in branch '3.5':
Issue bpo-25233: Rewrite the guts of Queue to be more understandable and correct. (Merge 3.4->3.5.)
https://hg.python.org/cpython/rev/a48d90049ae2

[python-dev]

New changeset 58695845e159 by Guido van Rossum in branch 'default':
Issue bpo-25233: Rewrite the guts of Queue to be more understandable and correct. (Merge 3.5->default.)
https://hg.python.org/cpython/rev/58695845e159