Some tests from test_leaks.py hang with pycares 4.9

[MeggyCal]

Describe the bug

Hi all, thanks for maintaining this useful library! While packaging stuff for openSUSE we found out that the testsuite hangs with with pycares 4.9. After some triage I located the hanging test(s) to test_leaks.py. Sadly, that is all I know, pytest-timeout doesn't help me as your testsuite is already using (and overriding) it.

As pycares 4.9.0 is somewhat "special", I hope there isn't similar "specialty" also in aiohtp.

To Reproduce

Run tests in test_leaks.py

Expected behavior

Tests should finish.

Logs/tracebacks

[   57s] + pytest-3.11 --ignore=_build.python311 --ignore=_build.python312 --ignore=_build.python313 -v --timeout=10 tests/test_leaks.py
[   58s] ============================= test session starts ==============================
[   58s] platform linux -- Python 3.11.13, pytest-8.3.5, pluggy-1.6.0 -- /usr/bin/python3.11
[   58s] cachedir: .pytest_cache
[   58s] rootdir: /home/abuild/rpmbuild/BUILD/python-aiohttp-3.12.13-build/aiohttp-3.12.13
[   58s] configfile: setup.cfg
[   58s] plugins: cov-5.0.0, mock-3.14.0, timeout-2.3.1, xdist-3.6.1, time-machine-2.16.0
[   58s] timeout: 10.0s
[   58s] timeout method: signal
[   58s] timeout func_only: False
[   58s] created: 4/4 workers
[   58s] 4 workers [2 items]
[   58s] 
[   58s] scheduling tests via LoadScheduling
[   58s] 
[   58s] tests/test_leaks.py::test_leak[check_for_client_response_leak.py-ClientResponse leaked] 
[   59s] tests/test_leaks.py::test_leak[check_for_request_leak.py-Request leaked] 

(after a long long time the VM would be killed for inactivity, no useful logs)

Python Version

3.11.13, 3.12.11, 3.13.5

aiohttp Version

3.12.13

multidict Version

6.1.0

propcache Version

0.3.1

yarl Version

1.20.1

OS

openSUSE Tumbleweed, latest

Related component

Server

Additional context

No response

Code of Conduct

• I agree to follow the aio-libs Code of Conduct

[Dreamsorcerer]

We'll probably need some more information than this, given that the test suite successfully upgraded to 4.9 already:
#11206

[MeggyCal]

Well, then I will investigate more. Currently I am AFK, but I will take a look ať some point.