Discovering: System.Net.Sockets.Tests (method display = ClassAndMethod, method display options = None)
Discovered: System.Net.Sockets.Tests (found 801 of 1201 test cases)
Starting: System.Net.Sockets.Tests (parallel test collections = on, max threads = 4)
System.Net.Sockets.Tests.OSSupportTest.IOControl_SIOCATMARK_Unix_Success [FAIL]
Assert.Equal() Failure
Expected: 1
Actual: 0
Stack Trace:
/_/src/libraries/System.Net.Sockets/tests/FunctionalTests/OSSupport.cs(108,0): at System.Net.Sockets.Tests.OSSupportTest.IOControl_SIOCATMARK_Unix_Success()
System.Net.Sockets.Tests.CreateSocket.Ctor_Raw_Supported_Success [SKIP]
Condition(s) not met: "SupportsRawSockets"
Finished: System.Net.Sockets.Tests
=== TEST EXECUTION SUMMARY ===
System.Net.Sockets.Tests Total: 1071, Errors: 0, Failed: 1, Skipped: 1, Time: 6.876s
The test failed in a CI run: https://dev.azure.com/dnceng/public/_build/results?buildId=664085&view=ms.vss-test-web.build-test-results-tab