System.Net.Sockets.Tests tests fail with ObjectDisposedException

[danmoseley]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1512502
Build error leg or test failing: System.Net.Sockets.Tests.WorkItemExecution
Pull request: #126006

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": ["System.Net.Sockets.Tests", "ObjectDisposedException", "System.Net.Sockets.SafeSocketHandle"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

net11.0-osx-Debug-x64-Mono_Minijit_Debug-OSX.15.Amd64.Open

  Starting:    System.Net.Sockets.Tests (parallel test collections = on [2 threads], stop on fail = off)
[ERROR] FATAL UNHANDLED EXCEPTION: System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.Sockets.SafeSocketHandle'.
   at System.Runtime.InteropServices.SafeHandle.DangerousAddRef(Boolean& success) in /_/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/SafeHandle.cs:line 165
   at System.Runtime.InteropServices.Marshalling.SafeHandleMarshaller`1.ManagedToUnmanagedIn[[System.Runtime.InteropServices.SafeHandle, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].FromManaged(SafeHandle handle) in /_/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshalling/SafeHandleMarshaller.cs:line 32
   at Interop.Sys.Fcntl.SetIsNonBlocking(SafeHandle fd, Int32 isNonBlocking) in /_/artifacts/obj/System.Net.Sockets/Debug/net11.0-unix/Microsoft.Interop.LibraryImportGenerator/Microsoft.Interop.LibraryImportGenerator/LibraryImports.g.cs:line 314
   at System.Net.Sockets.SocketAsyncContext.SetHandleBlocking() in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 1386
   at System.Net.Sockets.SafeSocketHandle.SetBlocking() in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SafeSocketHandle.Unix.cs:line 154
   at System.Net.Sockets.SocketAsyncContext.ConnectOperation.InvokeCallback(Boolean allowPooling) in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 681
   at System.Net.Sockets.SocketAsyncContext.OperationQueue`1[[System.Net.Sockets.SocketAsyncContext.WriteOperation, System.Net.Sockets, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].ProcessAsyncOperation(WriteOperation op) in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 1027
   at System.Net.Sockets.SocketAsyncContext.ProcessAsyncWriteOperation(WriteOperation op) in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 1468
   at System.Net.Sockets.SocketAsyncContext.WriteOperation.System.Threading.IThreadPoolWorkItem.Execute() in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 347
   at System.Net.Sockets.SocketAsyncContext.AsyncOperation.Process() in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 291
   at System.Net.Sockets.SocketAsyncContext.HandleEvents(SocketEvents events) in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs:line 2302
   at System.Net.Sockets.SocketAsyncEngine.System.Threading.IThreadPoolWorkItem.Execute() in /_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Unix.cs:line 279
   at System.Threading.ThreadPoolWorkQueue.Dispatch() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolWorkQueue.cs:line 950
   at System.Threading.PortableThreadPool.WorkerThread.WorkerDoWork(PortableThreadPool threadPoolInstance) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs:line 145
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs:line 121
   at System.Threading.Thread.StartHelper.RunWorker() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Thread.cs:line 90

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1512502
Error message validated: [System.Net.Sockets.Tests ObjectDisposedException System.Net.Sockets.SafeSocketHandle]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/17/2026 11:25:31 AM UTC

Report

Summary

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

Report

Build	Repository	Test	Pull Request
1512502	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#130416

Summary

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

Report

Build	Repository	Test	Pull Request
1592269	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#133413
1591631	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#133599
1590382	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#132953
1589850	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#132687
1571232	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#132852
1560289	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#132550
1556741	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#132453
1554265	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#132349

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
1	4	8

[dotnet-policy-service]

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[rzikm]

@liveans seems like this is related to setting non-blocking after connectasync

[liveans]

@liveans seems like this is related to setting non-blocking after connectasync

Seems like we need to make SetHandleBlocking best effort, I'll take a look next week.

[jeffschwMSFT]

removing blocking-clean-ci as it has not failed in 30 days

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

[svick]

I have encountered this in #130416, so I'm adding blocking-clean-ci back. Note that the ErrorMessage seems to have been wrong: it rarely matched, so I have fixed it.