Happened to me today: https://dev.azure.com/Python/cpython/_build/results?buildId=88208&view=logs&j=c83831cd-3752-5cc7-2f01-8276919eb334&t=5a421c4a-0933-53d5-26b9-04b36ad165eb
```
test_sendfile_close_peer_in_the_middle_of_receiving (test.test_asyncio.test_sendfile.ProactorEventLoopTests) ... FAIL
test test_asyncio failed
test_sendfile_close_peer_in_the_middle_of_receiving (test.test_asyncio.test_sendfile.SelectEventLoopTests) ... ok
======================================================================
FAIL: test_sendfile_close_peer_in_the_middle_of_receiving (test.test_asyncio.test_sendfile.ProactorEventLoopTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "D:\a\1\s\lib\test\test_asyncio\test_sendfile.py", line 457, in test_sendfile_close_peer_in_the_middle_of_receiving
with self.assertRaises(ConnectionError):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: ConnectionError not raised
----------------------------------------------------------------------
Ran 2 tests in 0.087s
FAILED (failures=1)
0:08:56 load avg: 3.51 Re-running test_concurrent_futures in verbose mode (matching: test_cancel_futures_wait_false)
test_cancel_futures_wait_false (test.test_concurrent_futures.ThreadPoolShutdownTest) ... ok
----------------------------------------------------------------------
Ran 1 test in 0.303s
OK
1 test failed again:
test_asyncio
```