[Known Build Error] TestServerTests.LongPollingWorks - ObjectDisposedException in OnDisconnectedAsync during shutdown

[lewing]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1325148
Build error leg or test failing: Tests: Helix x64 Subset 2 / Microsoft.AspNetCore.SignalR.Client.Tests--net11.0
Pull request: #65694

Error Message

{
  "ErrorMessage": "Error when dispatching 'OnDisconnectedAsync' on hub",
  "BuildRetry": true,
  "ExcludeConsoleLog": false
}

Description

TestServerTests.LongPollingWorks fails intermittently when the test host shuts down and OnDisconnectedAsync races with IServiceProvider disposal. The HttpConnectionDispatcher.ProcessDeleteAsync fire-and-forgets server-side connection disposal, so when the host tears down, DefaultHubDispatcher.OnDisconnectedAsync can attempt to call CreateAsyncScope() on an already-disposed ServiceProvider, throwing ObjectDisposedException.

Stack trace:

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)
   at Microsoft.AspNetCore.SignalR.HubConnectionHandler`1.RunHubAsync(HubConnectionContext connection)

Fix in progress: #65457 catches ObjectDisposedException at the DI boundary in DefaultHubDispatcher.OnDisconnectedAsync.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1325148
Error message validated: [Error when dispatching 'OnDisconnectedAsync' on hub]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 3/7/2026 10:12:12 PM UTC

Report

Build	Repository	Step Name	Console log	Pull Request
1460506	dotnet/aspnetcore	Run E2E tests	Log
1460264	dotnet/aspnetcore	Run E2E tests	Log	#67164
1460012	dotnet/aspnetcore	Run E2E tests	Log	#67157
1458720	dotnet/aspnetcore	Run E2E tests	Log	#67144
1458049	dotnet/aspnetcore	Run E2E tests	Log
1457878	dotnet/aspnetcore	Run E2E tests	Log	#67105
1447332	dotnet/aspnetcore	Run E2E tests	Log
1447197	dotnet/aspnetcore	Run E2E tests	Log
1446562	dotnet/aspnetcore	Run E2E tests	Log	#66989
1446811	dotnet/aspnetcore	Run E2E tests	Log
1447097	dotnet/aspnetcore	Run E2E tests	Log
1446546	dotnet/aspnetcore	Run E2E tests	Log
1442883	dotnet/aspnetcore	Run E2E tests	Log	#66946
1446232	dotnet/aspnetcore	Run E2E tests	Log	#66982
1445517	dotnet/aspnetcore	Run E2E tests	Log	#66973
1444847	dotnet/aspnetcore	Run E2E tests	Log	#66664
1443790	dotnet/aspnetcore	Run E2E tests	Log	#66699
1430521	dotnet/aspnetcore	Run E2E tests	Log	#66783
1428760	dotnet/aspnetcore	Run E2E tests	Log	#66766
1422378	dotnet/aspnetcore	Run E2E tests	Log	#66699

Build	Repository	Test	Pull Request
1456150	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net11.0.WorkItemExecution	#67048
1451834	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.FunctionalTests.HubConnectionTests.ChangingUserNameDuringReconnectLogsWarning	#66808
1450475	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks	#67022
1448583	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.StackExchangeRedis.Tests.RedisEndToEndTests.HubConnectionCanSendAndReceiveMessages	#66808
1448320	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net11.0.WorkItemExecution	#67006
1445034	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net11.0.WorkItemExecution	#66839
1443529	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net11.0.WorkItemExecution
1441031	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.FunctionalTests.HubConnectionTests.ChangingUserNameDuringReconnectLogsWarning	#66808
1437362	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks	#66832
1437062	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks
1431925	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net10.0.WorkItemExecution
1428746	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net11.0.WorkItemExecution	#66443
1429103	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.LongPollingWorks	#66747
1427089	dotnet/aspnetcore	Microsoft.AspNetCore.SignalR.Client.Tests--net11.0.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	7	34

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• SignalR: Error when dispatching '"OnDisconnectedAsync"' on hub and Failed disposing connection #6149

[github-actions]

This test is being quarantined via PR due to continued intermittent failures. The test fails with System.ObjectDisposedException: Cannot access a disposed object. Object name: 'IServiceProvider' occurring in OnDisconnectedAsync after the host shuts down.

The root cause appears to be a race condition during host shutdown where the IServiceProvider is disposed before the long-polling connection's disconnect handler completes. Quarantine PR is being opened to unblock CI.

Generated by Daily Test Quarantine Management · ◷