test_asyncio logs: Unknown child process

[GordonRBurgess]

BPO	37516
Nosy	@vstinner, @asvetlov, @1st1, @GordonRBurgess, @iritkatriel

^{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 = <Date 2021-10-20.10:15:49.932>
created_at = <Date 2019-07-06.20:54:24.321>
labels = ['3.8', 'build', 'expert-installation', 'expert-asyncio']
title = 'test_asyncio logs: Unknown child process'
updated_at = <Date 2021-10-20.10:15:49.931>
user = 'https://github.com/GordonRBurgess'

bugs.python.org fields:

activity = <Date 2021-10-20.10:15:49.931>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-20.10:15:49.932>
closer = 'iritkatriel'
components = ['Installation', 'asyncio']
creation = <Date 2019-07-06.20:54:24.321>
creator = 'gburgess'
dependencies = []
files = []
hgrepos = []
issue_num = 37516
keywords = []
message_count = 5.0
messages = ['347443', '347452', '347453', '355048', '404415']
nosy_count = 5.0
nosy_names = ['vstinner', 'asvetlov', 'yselivanov', 'gburgess', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue37516'
versions = ['Python 3.8']

[GordonRBurgess]

0:02:03 load avg: 3.08 [ 26/423] test_asyncio
Unknown child process pid 30234, will report returncode 255
Child watcher got an unexpected pid: 30234
Traceback (most recent call last):
  File "/home/gordon/Images/Python/Python-3.8.0b2/Lib/asyncio/unix_events.py", line 1213, in _do_waitpid
    loop, callback, args = self._callbacks.pop(pid)
KeyError: 30234

(first issue I've logged here, so thanks for your patience! This system is Debian 9.9 - a 3.7 make was running at the same time but had completed all of the tests before I kicked 3.8 off)

[GordonRBurgess]

Ran this on a different laptop (Debian 9.9, Lenovo w540) and it passed, so (as I'd expect) this is an intermittent issue. (The ticket was opened with an error on a Lenovo w510) Both systems have been reimaged in the last 6-8 months.

0:00:34 load avg: 1.18 [ 26/423] test_asyncio

[GordonRBurgess]

I got excited prematurely - this is farther down in the log on the second build:

...
0:16:09 load avg: 0.84 [341/423] test_sys_settrace
unhandled exception during asyncio.run() shutdown
task: <Task finished name='Task-4016' coro=<<async_generator_athrow without __name__>()> exception=RuntimeError("can't send non-None value to a just-started coroutine")>
RuntimeError: can't send non-None value to a just-started coroutine
unhandled exception during asyncio.run() shutdown
task: <Task finished name='Task-4019' coro=<<async_generator_athrow without __name__>()> exception=RuntimeError("can't send non-None value to a just-started coroutine")>
RuntimeError: can't send non-None value to a just-started coroutine
0:16:10 load avg: 0.84 [342/423] test_sysconfig
...

[vstinner]

The issue title says "test_asyncio fails", but "Unknown child process pid 30234, will report returncode 255" looks more like a warning. Does test_asyncio fail or not?

Please run test_asyncio in verbose mode to identify which test emits the warning.

Without further information, I suggest to just close the issue, since it doesn't sound like a bug, just a warning.

[iritkatriel]

Closing as there isn't enough information and there was no reply to followup questions. Also 3.8 is no longer maintained.

Please create a new issue with more information if you are still seeing a problem in a current version of python (3.9+).