Trial DirtyReactorAggregateError with asyncio on Windows

[twisted-trac]

	@wRAR reported
Trac ID	trac#10279
Type	defect
Created	2021-11-23 16:27:19Z

I'm getting 100% reproducible stray selectables/DelayedCalls with some of our (Scrapy) FTP/HTTP tests that happen only on Windows and only with the asyncio reactor. I'm attaching a simplified test case that makes a FTP server, a FTP client and connects using wrong credentials. As far as I can see the recommended cleanups are already done, yet I always get

[ERROR]
Traceback (most recent call last):
Failure: twisted.trial.util.DirtyReactorAggregateError: Reactor was unclean.
DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
<DelayedCall 0x1f739f900a0 [600.0s] called=0 cancelled=0 TimeoutMixin.__timedOut()>

test_foo.BaseFTPTestCase.test_invalid_credentials
===============================================================================
[ERROR]
Traceback (most recent call last):
Failure: twisted.trial.util.DirtyReactorAggregateError: Reactor was unclean.
Selectables:
<ProtocolWrapper #0 on 59858>

The DelayedCall debug output points at setTimeout in twisted.protocols.ftp.FTP.connectionMade.

Run with trial .\test_foo.py. Tested with Python 3.9 and 3.10, with Twisted 21.7.0.

Attachments:

• test_foo.py (1948 bytes) - added by wRAR on 2021-11-23 16:27:55Z - example of a failing test

Searchable metadata

trac-id__10279 10279
type__defect defect
reporter__wRAR wRAR
priority__normal normal
milestone__None None
branch__ 
branch_author__ 
status__new new
resolution__None None
component__core core
keywords__None None
time__1637684839192424 1637684839192424
changetime__1637684839192424 1637684839192424
version__None None
owner__None None