Quarantine Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks

[DeagleGross]

Failing Test(s)

Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks

Error Message

2 error(s) logged.
Microsoft.AspNetCore.SignalR.HubConnectionHandler - ErrorDispatchingHubEvent - Error when dispatching 'OnDisconnectedAsync' on hub.
===================
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'IServiceProvider'.
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ThrowHelper.ThrowObjectDisposedException()
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateScope()
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.CreateScope()
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.CreateAsyncScope(IServiceScopeFactory serviceScopeFactory)
   at Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher`1.OnDisconnectedAsync(HubConnectionContext connection, Exception exception) in /_/src/SignalR/server/Core/src/Internal/DefaultHubDispatcher.cs:line 121
   at Microsoft.AspNetCore.SignalR.HubConnectionHandler`1.HubOnDisconnectedAsync(HubConnectionContext connection, Exception exception) in /_/src/SignalR/server/Core/src/HubConnectionHandler.cs:line 230
   at Microsoft.AspNetCore.SignalR.HubConnectionHandler`1.RunHubAsync(HubConnectionContext connection) in /_/src/SignalR/server/Core/src/HubConnectionHandler.cs:line 197
   at Microsoft.AspNetCore.SignalR.HubConnectionHandler`1.OnConnectedAsync(ConnectionContext connection) in /_/src/SignalR/server/Core/src/HubConnectionHandler.cs:line 150

Stacktrace

Details

   at Xunit.Assert.Fail(String message) in /_/src/xunit.assert/Asserts/FailAsserts.cs:line 38
   at Microsoft.AspNetCore.SignalR.Tests.VerifyNoErrorsScope.Dispose() in D:\a\_work\1\s\src\Shared\SignalR\VerifyNoErrorScope.cs:line 47
   at Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks() in /_/src/SignalR/clients/csharp/Client/test/UnitTests/TestServerTests.cs:line 132
   at Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks() in /_/src/SignalR/clients/csharp/Client/test/UnitTests/TestServerTests.cs:line 85

Logs

Details

See Helix job 35384c48-24f5-4336-acda-41cf12fd025d, work item Microsoft.AspNetCore.SignalR.Client.Tests--net11.0, file TestServerTests_LongPollingWorks.log.

Build

https://dev.azure.com/dnceng-public/public/_build/results?buildId=1443529&view=results

Generated by Daily Test Quarantine Management · sonnet46 11.1M · ◷

[DeagleGross]

Investigation

The test LongPollingWorks in TestServerTests has failed 2 times over the past 30 days in the aspnetcore-ci pipeline on the main branch.

Root cause: The failure is a race condition during test teardown. The error is System.ObjectDisposedException: Cannot access a disposed object. Object name: 'IServiceProvider'. thrown inside OnDisconnectedAsync. This happens when the TestServer's IServiceProvider is disposed before the SignalR HubConnectionHandler finishes dispatching the OnDisconnectedAsync event. The long polling transport can delay connection teardown, making the timing window larger compared to WebSockets.

Similarity to related issue: This is the same type of race condition as the already-quarantined sibling test WebSocketsWorks (issue dotnet#65914), which also fails in TestServerTests with similar error messages about VerifyNoErrorsScope. The LongPollingWorks failure occurs at VerifyNoErrorsScope.Dispose() because the hub error is logged after the test scope attempts to verify no errors were logged.

Fix suggestion: The root cause is in the interaction between TestServer lifecycle and SignalR hub disposal ordering. A proper fix would require ensuring the hub's OnDisconnectedAsync completes before the host is disposed, similar to using await host.StopAsync() with sufficient timeout before scope disposal. This is a known issue pattern — see dotnet#65914 for the related WebSockets variant.

The test cannot be reliably fixed without changes to the TestServer or SignalR hub teardown sequence, so quarantining is the appropriate action while the underlying issue is investigated.

Generated by Daily Test Quarantine Management · sonnet46 11.1M · ◷

[DeagleGross]

Triage Summary

Area: area-signalr — The failing test is Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks, involving HubConnectionHandler, DefaultHubDispatcher, and OnDisconnectedAsync — all core SignalR server components.

Type: Bug — A flaky test failure caused by a race condition during teardown: System.ObjectDisposedException is thrown when IServiceProvider is disposed before OnDisconnectedAsync completes in the SignalR hub.

Potential Duplicates

• [test-quarantine] Quarantine TestServerTests.LongPollingWorks #559 - [test-quarantine] Quarantine TestServerTests.LongPollingWorks (similarity: high — same test, same failure, same root cause; this is the quarantine PR associated with this issue)

Notes

• The error is a teardown race: IServiceProvider is disposed while DefaultHubDispatcher.OnDisconnectedAsync is still trying to create a scope via CreateAsyncScope.
• Issue [test-quarantine] Quarantine TestServerTests.LongPollingWorks #559 notes this is the same class of failure as the already-quarantined sibling test WebSocketsWorks.
• The issue already has the test-failure label applied correctly.

Generated by Issue Triage Agent for dotnet/aspnetcore for issue #558 · sonnet46 632.9K · ◷