[Tests] ERROR at setup of test_cancel

[drew2a]

This error occurred https://github.com/Tribler/tribler/actions/runs/3361258378/jobs/5571841665 in #7112

==================================== ERRORS ====================================
    res = self._callback(*self._args, **self._kwargs)
  File "/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/multiprocessing/util.py", line 464, in close_fds
    os.close(fd)
OSError: [Errno 9] Bad file descriptor
________________________ ERROR at setup of test_cancel _________________________

fixturedef = <FixtureDef argname='event_loop' scope='function' baseid='src/tribler/core'>
request = <SubRequest 'event_loop' for <Function test_cancel>>

    @pytest.hookimpl(hookwrapper=True)
    def pytest_fixture_setup(
        fixturedef: FixtureDef, request: SubRequest
    ) -> Optional[object]:
        """Adjust the event loop policy when an event loop is produced."""
        if fixturedef.argname == "event_loop":
            outcome = yield
            loop = outcome.get_result()
            policy = asyncio.get_event_loop_policy()
            try:
                old_loop = policy.get_event_loop()
                if old_loop is not loop:
>                   old_loop.close()

../../../.virtualenvs/.venv/lib/python3.8/site-packages/pytest_asyncio/plugin.py:382: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/asyncio/unix_events.py:58: in close
    super().close()
/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/asyncio/selector_events.py:92: in close
    self._close_self_pipe()
/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/asyncio/selector_events.py:102: in _close_self_pipe
    self._csock.close()
/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/socket.py:500: in close
    self._real_close()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <socket.socket [closed] fd=-1, family=AddressFamily.AF_UNIX, type=SocketKind.SOCK_STREAM, proto=0>
_ss = <class '_socket.socket'>

    def _real_close(self, _ss=_socket.socket):
        # This function should not reference any globals. See issue #808164.
>       _ss.close(self)
E       OSError: [Errno 9] Bad file descriptor

/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/socket.py:494: OSError
_______________________ ERROR at teardown of test_cancel _______________________

fixturedef = <FixtureDef argname='event_loop' scope='function' baseid='src/tribler/core'>
request = <SubRequest 'event_loop' for <Function test_cancel>>

    @pytest.hookimpl(trylast=True)
    def pytest_fixture_post_finalizer(fixturedef: FixtureDef, request: SubRequest) -> None:
        """Called after fixture teardown"""
        if fixturedef.argname == "event_loop":
            policy = asyncio.get_event_loop_policy()
            try:
                loop = policy.get_event_loop()
            except RuntimeError:
                loop = None
            if loop is not None:
                # Clean up existing loop to avoid ResourceWarnings
>               loop.close()

../../../.virtualenvs/.venv/lib/python3.8/site-packages/pytest_asyncio/plugin.py:364: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/asyncio/unix_events.py:58: in close
    super().close()
/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/asyncio/selector_events.py:92: in close
    self._close_self_pipe()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <_UnixSelectorEventLoop running=False closed=False debug=False>

    def _close_self_pipe(self):
>       self._remove_reader(self._ssock.fileno())
E       AttributeError: 'NoneType' object has no attribute 'fileno'

/opt/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/asyncio/selector_events.py:99: AttributeError
=========================== short test summary info ============================
ERROR src/tribler/core/utilities/tests/test_async_group.py::test_cancel - OSE...
ERROR src/tribler/core/utilities/tests/test_async_group.py::test_cancel - Att...
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 2 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!