Stack traces with async variants

@davidwr

The stack trace metadata would likely only have information about the thunk, not about the the calling method.

So doing DiagnosticMethodInfo.Create(new StackFrame()) in a runtime async method will likely return no information. We need to swap IsAsyncCall bodies for thunks when emitting stack trace information.

Also figure out what CoreCLR does for new StackFrame(1) (i.e. asking for the thunk).

From @davidwr This is also an issue for the coreclr interpreter, as it needs a helper function, which is defined in C#, and there is no way to disable that either.

@agocke

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

new StackTrace() inside async methods -> Useless, Lack of frames with sync caller method (initiator) #60764

Also figure out what CoreCLR does for new StackFrame(1) (i.e. asking for the thunk).

Seems like CoreCLR skips thunks. (skips resume stubs too). #122517 (comment)

@VSadov

@VSadov This is also an issue for the coreclr interpreter, as it needs a helper function, which is defined in C#, and there is no way to disable that either. I don't think that this test is a good idea. We can fairly easily remove the thunks from the Exception ToString, etc, by using [StackTraceHidden], and I'll do that, but the StackFrame api doesn't have that flexibility.

Fixed by #122722

ActiveIssue wasn't removed from the test and the test is still failing: #125423. Reopening.

System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Async2Reflection.FromStackDMIAsync(Int32)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean)
   at Async2Reflection.FromStackDMI(Int32)

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Stack traces with async variants #122547

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Stack traces with async variants #122547

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dotnet-policy-service commented on Dec 15, 2025

MihuBot commented on Dec 15, 2025

VSadov commented on Dec 15, 2025

davidwrighton commented on Jan 6, 2026

jkotas commented on Feb 8, 2026

MichalStrehovsky commented on Mar 11, 2026

MichalStrehovsky commented on Mar 11, 2026

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