Asyncio can't close sockets properly on Linux cause CLOSE_WAIT

@tiran

BPO	43183
Nosy	@tiran, @ntc2, @asvetlov, @1st1
Files	server.py

^{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/tiran'
closed_at = <Date 2021-02-10.10:20:31.973>
created_at = <Date 2021-02-10.01:42:49.923>
labels = ['expert-SSL', 'type-bug', '3.8', '3.9', '3.10', '3.7', 'expert-asyncio']
title = "Asyncio can't close sockets properly on Linux cause CLOSE_WAIT"
updated_at = <Date 2021-08-02.07:59:27.063>
user = 'https://bugs.python.org/Bob2021'

bugs.python.org fields:

activity = <Date 2021-08-02.07:59:27.063>
actor = 'ntc2'
assignee = 'christian.heimes'
closed = True
closed_date = <Date 2021-02-10.10:20:31.973>
closer = 'Bob_2021'
components = ['asyncio', 'SSL']
creation = <Date 2021-02-10.01:42:49.923>
creator = 'Bob_2021'
dependencies = []
files = ['49799']
hgrepos = []
issue_num = 43183
keywords = []
message_count = 3.0
messages = ['386753', '398697', '398733']
nosy_count = 5.0
nosy_names = ['christian.heimes', 'ntc2', 'asvetlov', 'yselivanov', 'Bob_2021']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43183'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

I wrote a simple proxy with Python3.8 and Asyncio, but I found it couldn't handle passive close correctly, a lot of CLOSE_WAIT sockets couldn't be released. I had trouble shot it for a long time with no progress.

netstat -anop tcp | grep CLOSE_WAIT

tcp6 0 0 64.XXX.XXX.XXX:80 113.58.229.12:46996 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 222.137.35.237:54914 CLOSE_WAIT 10485/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 119.39.47.229:53882 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 123.14.254.238:49262 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 121.57.230.51:35036 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 124.235.138.253:44882 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 36.5.157.219:38006 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)
tcp6 0 0 64.XXX.XXX.XXX:80 150.255.5.121:39288 CLOSE_WAIT 10486/python3.8 off (0.00/0/0)

What was the resolution for this issue? I'm experiencing asyncio.StreamReader.readline() hanging forever on a socket in CLOSE_WAIT state.

I created a new issue for my bug here: https://bugs.python.org/issue44805

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Asyncio can't close sockets properly on Linux cause CLOSE_WAIT #87349

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Asyncio can't close sockets properly on Linux cause CLOSE_WAIT #87349

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Bob2021 commented on Feb 10, 2021

ntc2 commented on Aug 1, 2021

ntc2 commented on Aug 2, 2021

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