Test failure System.Net.NameResolution.Tests.GetHostAddressesTest_Cancellation.DnsGetHostAddresses_PostCancelledToken_Throws

[VincentBu]

Run: runtime-coreclr libraries-jitstress 20220530.1

Failed test:

net7.0-windows-Release-x86-CoreCLR_checked-jitstress1-Windows.10.Amd64.Open

- System.Net.NameResolution.Tests.GetHostAddressesTest_Cancellation.DnsGetHostAddresses_PostCancelledToken_Throws

Error message:

Assert.Throws() Failure
Expected: typeof(System.OperationCanceledException)
Actual:   typeof(System.Net.Sockets.SocketException): No such host is known.
---- System.Net.Sockets.SocketException : No such host is known.


Stack trace
   at System.Net.NameResolutionPal.ProcessResult(SocketError errorCode, GetAddrInfoExContext* context) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 220
   at System.Net.NameResolutionPal.GetAddressInfoExCallback(Int32 error, Int32 bytes, NativeOverlapped* overlapped) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 192
--- End of stack trace from previous location ---
----- Inner Stack Trace -----
   at System.Net.NameResolutionPal.ProcessResult(SocketError errorCode, GetAddrInfoExContext* context) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 220
   at System.Net.NameResolutionPal.GetAddressInfoExCallback(Int32 error, Int32 bytes, NativeOverlapped* overlapped) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 192
--- End of stack trace from previous location ---

No Kusto information.

CI leg: runtime-coreclr libraries-jitstress

Date	branch	OS
2022-05-30T07:55:59.41Z	main	Windows.10.Amd64.Open
2022-05-31T08:14:01.729Z	main	Windows.10.Amd64.Open

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Issue Details

---

Run: runtime-coreclr libraries-jitstress 20220530.1

Failed test:

net7.0-windows-Release-x86-CoreCLR_checked-jitstress1-Windows.10.Amd64.Open

- System.Net.NameResolution.Tests.GetHostAddressesTest_Cancellation.DnsGetHostAddresses_PostCancelledToken_Throws

Error message:

Assert.Throws() Failure
Expected: typeof(System.OperationCanceledException)
Actual:   typeof(System.Net.Sockets.SocketException): No such host is known.
---- System.Net.Sockets.SocketException : No such host is known.


Stack trace
   at System.Net.NameResolutionPal.ProcessResult(SocketError errorCode, GetAddrInfoExContext* context) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 220
   at System.Net.NameResolutionPal.GetAddressInfoExCallback(Int32 error, Int32 bytes, NativeOverlapped* overlapped) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 192
--- End of stack trace from previous location ---
----- Inner Stack Trace -----
   at System.Net.NameResolutionPal.ProcessResult(SocketError errorCode, GetAddrInfoExContext* context) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 220
   at System.Net.NameResolutionPal.GetAddressInfoExCallback(Int32 error, Int32 bytes, NativeOverlapped* overlapped) in /_/src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs:line 192
--- End of stack trace from previous location ---

No Kusto information.

Author:	VincentBu
Assignees:	-
Labels:	arch-x86, area-System.Net, os-windows, JitStress, blocking-clean-ci-optional
Milestone:	-

[rzikm]

The test contains following comment:

        // This test might flake if the cancellation token takes too long to trigger:
        // It's a race between the DNS server getting back to us and the cancellation processing.

We should probably compensate for it the tests flakiness.

[wfurt]

... or skip for jitstress....

[jakobbotsch]

... or skip for jitstress....

We run a lot of jitstress legs so often flaky tests are exposed under jitstress simply by chance. Even if you skip it for jitstress it is likely this problem will show up in other future runs.

Edit: e.g. here is a standard runtime failure: https://dev.azure.com/dnceng/public/_build/results?buildId=1798159&view=ms.vss-test-web.build-test-results-tab&runId=47979192&resultId=177258&paneView=debug