Python 3.14: test_ki_protection_doesnt_leave_cyclic_garbage fails #3209
Description
The sed command below comments out orjson from test-requirements.txt since it’s not yet installable on Python 3.14. Otherwise, this can be reproduced by simply running the tests in a Python 3.14.0a4 virtualenv:
$ git clone https://github.com/python-trio/trio.git
$ cd trio
$ uv venv _e --python 3.14
Using CPython 3.14.0a4 interpreter at: /usr/bin/python3.14
Creating virtual environment at: _e
Activate with: source _e/bin/activate
$ . _e/bin/activate
(_e) $ uv pip install -e .
(_e) $ sed -r -i 's/^orjson/# &/' test-requirements.txt
(_e) $ uv pip install -r test-requirements.txt
(_e) $ python -m pytest
[…]
============================================== FAILURES ==============================================
___________________________ test_ki_protection_doesnt_leave_cyclic_garbage ___________________________
@pytest.mark.skipif(
sys.implementation.name != "cpython",
reason="Only makes sense with refcounting GC",
)
async def test_ki_protection_doesnt_leave_cyclic_garbage() -> None:
class MyException(Exception):
pass
async def demo() -> None:
async def handle_error() -> None:
try:
raise MyException
except MyException as e:
exceptions.append(e)
exceptions: list[MyException] = []
try:
async with _core.open_nursery() as n:
n.start_soon(handle_error)
raise ExceptionGroup("errors", exceptions)
finally:
exceptions = []
exc: Exception | None = None
try:
await demo()
except ExceptionGroup as excs:
exc = excs.exceptions[0]
assert isinstance(exc, MyException)
> assert gc.get_referrers(exc) == no_other_refs()
E assert [<coroutine o...7f6a92bb0c40>] == []
E
E Left contains one more item: <coroutine object test_ki_protection_doesnt_leave_cyclic_garbage at 0x7f6a92bb0c40>
E Use -v to get more diff
src/trio/_core/_tests/test_run.py:2846: AssertionError
====================================== short test summary info =======================================
FAILED src/trio/_core/_tests/test_run.py::test_ki_protection_doesnt_leave_cyclic_garbage - assert [<coroutine o...7f6a92bb0c40>] == []
======================== 1 failed, 766 passed, 79 skipped, 2 xfailed in 6.89s ========================
This was originally reported in Fedora.