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System.Net.WebSockets.Client.Tests.CancelTest_HttpClient_Loopback.SendAsync_Cancel_Success failure: Actual Open when System.Threading.Tasks.TaskCanceledException #132031
Description
Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1544883
Build error leg or test failing: System.Net.WebSockets.Client.Tests.CancelTest_HttpClient_Loopback.SendAsync_Cancel_Success
Pull request: #131894
System.Net.WebSockets.Client.Tests.CancelTest_HttpClient_Loopback.SendAsync_Cancel_Success(useSsl: False) [FAIL]
Actual Open when System.Threading.Tasks.TaskCanceledException: A task was canceled.
at System.Net.WebSockets.ManagedWebSocket.SendFrameFallbackAsync(MessageOpcode opcode, Boolean endOfMessage, Boolean disableCompression, ReadOnlyMemory`1 payloadBuffer, Task lockTask, CancellationToken cancellationToken) in /_/src/libraries/System.Net.WebSockets/src/System/Net/WebSockets/ManagedWebSocket.cs:line 602
at System.Net.WebSockets.Client.Tests.ClientWebSocketTestBase.TestCancellation(Func`2 action, Uri server) in /_/src/libraries/System.Net.WebSockets.Client/tests/ClientWebSocketTestBase.cs:line 74
Stack Trace:
/_/src/libraries/System.Net.WebSockets.Client/tests/ClientWebSocketTestBase.cs(79,0): at System.Net.WebSockets.Client.Tests.ClientWebSocketTestBase.TestCancellation(Func`2 action, Uri server)
/_/src/libraries/System.Net.WebSockets.Client/tests/CancelTest.cs(57,0): at System.Net.WebSockets.Client.Tests.CancelTestBase.RunClient_SendAsync_Cancel_Success(Uri server)
/_/src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeAsyncTaskContinuation.cs(131,0): at System.Runtime.CompilerServices.RuntimeAsyncTaskContinuation.GetResult(Task task, Byte& result)
/_/src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeAsyncTaskContinuation.cs(114,0): at System.Runtime.CompilerServices.RuntimeAsyncTaskContinuation.GetResult(Byte& returnValue)
/_/src/libraries/System.Net.WebSockets.Client/tests/LoopbackServer/LoopbackWebSocketServer.cs(40,0): at System.Net.WebSockets.Client.Tests.LoopbackWebSocketServer.<>c__DisplayClass1_0.<RunAsync>b__0(Uri uri)
/_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(119,0): at System.Threading.Tasks.TaskTimeoutExtensions.GetRealException(Task task)
--- End of stack trace from previous location ---
/_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(89,0): at System.Threading.Tasks.TaskTimeoutExtensions.WhenAllOrAnyFailed(Task[] tasks)
/_/src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeAsyncTaskContinuation.cs(131,0): at System.Runtime.CompilerServices.RuntimeAsyncTaskContinuation.GetResult(Task task, Byte& result)
/_/src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeAsyncTaskContinuation.cs(114,0): at System.Runtime.CompilerServices.RuntimeAsyncTaskContinuation.GetResult(Byte& returnValue)
/_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(54,0): at System.Threading.Tasks.TaskTimeoutExtensions.WhenAllOrAnyFailed(Task[] tasks, Int32 millisecondsTimeout)
/_/src/libraries/System.Net.WebSockets.Client/tests/LoopbackServer/LoopbackWebSocketServer.Http.cs(32,0): at System.Net.WebSockets.Client.Tests.LoopbackWebSocketServer.HttpRunner.RunAsync(Func`2 clientFunc, Func`3 wsServerFunc, Options options, CancellationToken clientExitCt, CancellationToken globalCt)
--- End of stack trace from previous location ---
Error Message
{
"ErrorMessage": ["SendAsync_Cancel_Success", "Actual Open when System.Threading.Tasks.TaskCanceledException"],
"BuildRetry": false,
"ExcludeConsoleLog": false
}Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1544883
Error message validated: [SendAsync_Cancel_Success Actual Open when System.Threading.Tasks.TaskCanceledException]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/8/2026 2:15:59 AM UTC
Report
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 4 | 61 | 168 |
Activity
dotnet-policy-service commentedon Aug 8, 2026
Tagging subscribers to this area: @karelz, @dotnet/ncl
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JulieLeeMSFT commentedon Sep 1, 2026
Failed in (2):
Stabilize ConnectAsync_Cancel_ThrowsCancellationException loopback te…
Fix ManagedWebSocket send cancellation leaving state Open (#133199)
Fix ManagedWebSocket send cancellation leaving state Open (dotnet#133199