[issue32458] test_asyncio: test_start_tls_server_1() fails randomly

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I have not seen test_asyncio fail on AppVeyor since about Sunday.  
https://ci.appveyor.com/project/python/cpython/history
shows only a couple of failures, which could very well be real.
I have seen test_asyncio fail on Travis since Sunday.

With my local repository 32-bit debug build of master branch:

If I run python -m test.test_asyncio -v,
test_sock_sendfile_not_regular_file (test.test_asyncio.test_proactor_events.ProactorEventLoopUnixSockSendfileTests) ... (and the test process) aborts with a failed debug assertion:
minkernel\crts\ucrt\src\appcrt\lowio\osfinfo.cpp, line 257
  fh >=  0 && (unsigned)fh < (unsigned)_nhandle

If I run python -m test test_asyncio, I get
F:\dev\3x\lib\asyncio\sslproto.py:320: ResourceWarning: unclosed transport <asyncio.sslproto._SSLProtocolTransport object at 0x052DA4D0>
  source=self)
F:\dev\3x\lib\asyncio\sslproto.py:320: ResourceWarning: unclosed transport <asyncio.sslproto._SSLProtocolTransport object at 0x0476A118>
  source=self)
Exception in callback _ProactorReadPipeTransport._loop_reading__data_received(<_OverlappedFuture cancelled>)
handle: <Handle _ProactorReadPipeTransport._loop_reading__data_received(<_OverlappedFuture cancelled>)>
Traceback (most recent call last):
  File "F:\dev\3x\lib\asyncio\events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "F:\dev\3x\lib\asyncio\proactor_events.py", line 222, in _loop_reading__data_received
    self._closing)
AssertionError
test_asyncio passed in 35 sec
1 test OK.

With -v, above is scattered in verbose output, but test_start_tls_server_1 passed both times.

Specifically, I ran the following 10 times with no failures.
f:\dev\3x>python -m test -v -m test_start_tls_server_1 test_asyncio
...
test_start_tls_server_1 (test.test_asyncio.test_sslproto.ProactorStartTLSTests) ... ok
test_start_tls_server_1 (test.test_asyncio.test_sslproto.SelectorStartTLSTests) ... ok

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nosy:  -christian.heimes

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<https://bugs.python.org/issue32458>
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