python / python/cpython

asyncio.ProactorEventLoop mishandles signal wakeup file descriptor

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OS-windows topic-asyncio type-bug
Dominant language
Python
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Description

BPO 42913
Nosy @gvanrossum, @pfmoore, @tjguk, @asvetlov, @zware, @1st1, @zooba, @hidmic

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 2021-01-12.21:43:53.586>
labels = ['type-bug', '3.8', 'OS-windows', 'expert-asyncio']
title = 'asyncio.ProactorEventLoop mishandles signal wakeup file descriptor'
updated_at = <Date 2021-07-29.05:27:36.588>
user = 'https://github.com/hidmic'

bugs.python.org fields:

activity = <Date 2021-07-29.05:27:36.588>
actor = 'gvanrossum'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Windows', 'asyncio']
creation = <Date 2021-01-12.21:43:53.586>
creator = 'hidmic'
dependencies = []
files = []
hgrepos = []
issue_num = 42913
keywords = []
message_count = 6.0
messages = ['384979', '384998', '385198', '385211', '398445', '398457']
nosy_count = 8.0
nosy_names = ['gvanrossum', 'paul.moore', 'tim.golden', 'asvetlov', 'zach.ware', 'yselivanov', 'steve.dower', 'hidmic']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42913'
versions = ['Python 3.8']

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with asyncio.ProactorEventLoop and the Windows asyncio implementation, then trace how the signal wakeup file descriptor is handled. Reproduce the issue on Windows and add regression coverage; done means the event loop handles the signal wakeup descriptor correctly.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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