WinHttpHandler assertion failure

[stephentoub]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=374495
Build error leg or test failing: System.Net.Http.WinHttpHandler.Functional.Tests.WorkItemExecution
Pull request: #90595

Error Message

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

{
  "ErrorMessage": "System.Net.Http.WinHttpHandler.Functional.Tests.WorkItemExecution",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Process terminated. Assertion failed.
   at System.Net.Http.WinHttpHandler.StartRequestAsync(WinHttpRequestState state) in /_/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs:line 885
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine) in /_/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs:line 38
   at System.Net.Http.WinHttpHandler.StartRequestAsync(WinHttpRequestState state)
   at System.Net.Http.WinHttpHandler.<>c.<SendAsync>b__118_0(Object s) in /_/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs:line 614
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs:line 264
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:line 2349
   at System.Threading.ThreadPoolWorkQueue.Dispatch() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolWorkQueue.cs:line 913
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.NonBrowser.cs:line 58
   at System.Threading.Thread.StartCallback() in /_/src/coreclr/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs:line 105

runtime/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs

Line 885 in 337e95e

Debug.Assert(_sessionHandle != null);

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=374495
Error message validated: System.Net.Http.WinHttpHandler.Functional.Tests.WorkItemExecution
Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 8/15/2023 5:28:46 PM UTC

Report

Summary

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

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Issue Details

---

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=374495
Build error leg or test failing: System.Net.Http.WinHttpHandler.Functional.Tests.WorkItemExecution
Pull request: #90595

Error Message

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

{
  "ErrorMessage": "System.Net.Http.WinHttpHandler.Functional.Tests.WorkItemExecution",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Process terminated. Assertion failed.
   at System.Net.Http.WinHttpHandler.StartRequestAsync(WinHttpRequestState state) in /_/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs:line 885
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine) in /_/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs:line 38
   at System.Net.Http.WinHttpHandler.StartRequestAsync(WinHttpRequestState state)
   at System.Net.Http.WinHttpHandler.<>c.<SendAsync>b__118_0(Object s) in /_/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs:line 614
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs:line 264
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:line 2349
   at System.Threading.ThreadPoolWorkQueue.Dispatch() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolWorkQueue.cs:line 913
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.NonBrowser.cs:line 58
   at System.Threading.Thread.StartCallback() in /_/src/coreclr/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs:line 105

runtime/src/libraries/System.Net.Http.WinHttpHandler/src/System/Net/Http/WinHttpHandler.cs

Line 885 in 337e95e

Debug.Assert(_sessionHandle != null);

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=374495
Error message validated: System.Net.Http.WinHttpHandler.Functional.Tests.WorkItemExecution
Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 8/15/2023 5:28:46 PM UTC

Author:	stephentoub
Assignees:	-
Labels:	area-System.Net.Http, blocking-clean-ci, untriaged, Known Build Error
Milestone:	-

[antonfirsov]

This is odd. I don't see how can EnsureSessionHandleExists return without either assigning _sessionHandle or throwing an exception.

We should watch if this occurs again, but so far it looks like this happened only once, and there's nothing we can do about this at the moment. Moving to Future for now.