SendRecv_0ByteReceive_Success Fails on Mono

[Anipik]

https://dev.azure.com/dnceng/public/_build/results?buildId=798022&view=logs&j=e25ca8f9-4d91-5a25-cc71-96bc9bb65608&t=22eea7f6-9ad0-52cf-3602-d79b35211bce

https://helix.dot.net/api/2019-06-17/jobs/46f1dd60-28dc-4609-9028-34004178de8d/workitems/System.Net.Sockets.Tests/console

/root/helix/work/workitem /root/helix/work/workitem
  Discovering: System.Net.Sockets.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Net.Sockets.Tests (found 838 of 1232 test cases)
  Starting:    System.Net.Sockets.Tests (parallel test collections = on, max threads = 6)
    System.Net.Sockets.Tests.UdpClientTest.Finalize_NoExceptionsThrown [SKIP]
      Condition(s) not met: "IsPreciseGcSupported"
    System.Net.Sockets.Tests.DisposedSocket.NonDisposedSocket_SafeHandlesCollected [SKIP]
      Condition(s) not met: "IsPreciseGcSupported"
    System.Net.Sockets.Tests.CreateSocket.Ctor_Raw_Supported_Success [SKIP]
      Condition(s) not met: "SupportsRawSockets"
    System.Net.Sockets.Tests.SendReceiveTask.SendRecv_0ByteReceive_Success [FAIL]
      Assert.False() Failure
      Expected: False
      Actual:   True
      Stack Trace:
        /_/src/libraries/System.Net.Sockets/tests/FunctionalTests/SendReceive.cs(681,0): at System.Net.Sockets.Tests.SendReceive`1.<SendRecv_0ByteReceive_Success>d__11[[System.Net.Sockets.Tests.SocketHelperTask, System.Net.Sockets.Tests, Version=5.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()
        --- End of stack trace from previous location ---
  Finished:    System.Net.Sockets.Tests
=== TEST EXECUTION SUMMARY ===
   System.Net.Sockets.Tests  Total: 1118, Errors: 0, Failed: 1, Skipped: 3, Time: 22.494s

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[steveisok]

Using this Kusto query, it appears the test has failed once, ever.

TestResults
| where WorkItemFriendlyName == "System.Net.Sockets.Tests" and Method == "SendRecv_0ByteReceive_Success" and Result == "Fail"
| order by Duration desc 

We should monitor if this continues, but I suspect it may be networking related and not a specific runtime issue.

[wfurt]

It is interesting that the test expects Task to be pending since there is nothing to read ... yet. So this seems more like Async scheduling issue than networking.
We can certainly close it if there is re-occurence.

[jaredpar]

No hits in last 14 days. Closing

https://runfo.azurewebsites.net/search/tests/?bq=definition%3Aruntime+started%3A%7E14&tq=name%3ASendRecv_0ByteReceive_Succes