[ci-scan] Test failure: AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths under libraries-jitstress

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1484168
Build error leg or test failing: windows-x64 Release - System.Threading.Tasks.Tests

Error Details

AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths fails under jitstress mode in the runtime-coreclr libraries-jitstress pipeline (def 138). The test expects the async profiler to emit at least 3 buffer flushes, but only 2 are observed under stress conditions.

System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths [FAIL]
      Expected at least 3 buffer flushes, got 2
      ----- BEGIN ASYNC EVENTS (CSV) -----
      seq,delta,thread,event,disp,parent,frames,unwind
      0,0,5056,AsyncProfilerMetadata,0,0,0,0
      1,281,5056,ResetAsyncThreadContext,0,0,0,0
      2,283,5056,CreateStateMachineAsyncContext,387,0,0,0
      ...
      at AsyncProfilerTests.AssertTrue(EventDump dump, Boolean condition, String message)
      at AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths()

Error Message

{
  "ErrorMessage": ["StateMachineAsync_CallstackStressWithVaryingDepths", "Expected at least 3 buffer flushes"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Impact on platforms

• runtime-coreclr libraries-jitstress (def 138) / windows-x64 Release / Helix: Windows.10.Amd64.Open

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1482524
• Finished: 2026-06-26T09:19:41Z
• Source and follow-up (build 1484168, Jun 27) both have this failure on windows-x64 Release

Duplicate search

• "StateMachineAsync_CallstackStressWithVaryingDepths" label:"Known Build Error" — 0 results
• "StateMachineAsync_CallstackStressWithVaryingDepths" is:open — 0 results
• "CallstackStress" OR "buffer flushes" label:"Known Build Error" is:closed closed:>=2026-05-28 — 0 results
• "StateMachineAsync_CallstackStressWithVaryingDepths" is:pr is:merged merged:>=2026-06-20 — 0 results

No existing KBE matches this signature.

Related: #129920 (different AsyncProfilerTests failure on runtime-libraries-interpreter)

---

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

Note

🔒 Integrity filter blocked 4 items

The following items were blocked because they don't meet the GitHub integrity level.

• #129832 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #129876 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #114222 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #117138 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by CI Outer-Loop Failure Scanner · ● 101.8M · ◷

Report

Build	Repository	Test	Pull Request
1494534	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494438	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130218
1494375	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494363	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494358	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130210
1494229	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130205
1494216	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494188	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494160	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494056	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494059	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130197
1494037	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1494002	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#125379
1493699	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130161
1493419	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130181
1493223	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128777
1493177	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130016
1493151	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129212
1493145	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130170
1493125	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128585
1492849	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1492343	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130142
1492222	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129267
1491763	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#125452
1491670	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128799
1491091	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129995
1490753	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130101
1490777	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#127980
1490631	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128795
1490102	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130070
1489947	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129806
1490028	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129806
1489856	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130039
1489644	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130036
1489661	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130075
1489302	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1489022	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130062
1488897	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129424
1488769	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130010
1487610	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#130027
1487210	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128950
1486870	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129424
1486828	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129490
1486454	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129941
1486463	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128862
1486107	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129624
1486222	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129852
1486067	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129582
1485863	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#129963
1485857	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1485400	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1484748	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1484715	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths
1481136	dotnet/runtime	System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths	#128721

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
7	51	54

[VincentBu]

Failed in: runtime-coreclr libraries-jitstress2-jitstressregs 20260627.1

Failed tests:

net11.0-windows-Release-x64-jitstress2_jitstressregs4-Windows.10.Amd64.Open
- System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths

Error message:

Expected at least 3 buffer flushes, got 2

----- BEGIN ASYNC EVENTS (CSV) -----

seq,delta,thread,event,disp,parent,frames,unwind

0,0,1076,AsyncProfilerMetadata,0,0,0,0

1,269,1076,ResetAsyncThreadContext,0,0,0,0

2,272,1076,CreateStateMachineAsyncContext,381,0,0,0

3,971997,1076,ResumeStateMachineAsyncContext,381,0,0,0

4,971998,1076,ResumeStateMachineAsyncCallstack,381,0,41,0

5,1176937,1076,CreateStateMachineAsyncContext,383,382,0,0

6,1177259,1076,CompleteStateMachineAsyncContext,381,0,0,0

7,2221172,1076,ResumeStateMachineAsyncContext,383,0,0,0

8,2221173,1076,ResumeStateMachineAsyncCallstack,383,0,10,0

9,2223986,1076,CreateStateMachineAsyncContext,384,382,0,0

10,2224213,1076,CompleteStateMachineAsyncContext,383,0,0,0

11,3315164,1076,ResumeStateMachineAsyncContext,384,0,0,0

12,3315165,1076,ResumeStateMachineAsyncCallstack,384,0,9,0

13,3315969,1076,CreateStateMachineAsyncContext,385,382,0,0

14,3316405,1076,CompleteStateMachineAsyncContext,384,0,0,0

15,4409866,1076,ResumeStateMachineAsyncContext,385,0,0,0

16,4409867,1076,ResumeStateMachineAsyncCallstack,385,0,32,0

17,4410985,1076,CreateStateMachineAsyncContext,386,382,0,0

18,4411648,1076,CompleteStateMachineAsyncContext,385,0,0,0

19,5502341,1076,ResumeStateMachineAsyncContext,386,0,0,0

20,5502342,1076,ResumeStateMachineAsyncCallstack,386,0,11,0

21,5503019,1076,CreateStateMachineAsyncContext,387,382,0,0

22,5503324,1076,CompleteStateMachineAsyncContext,386,0,0,0

23,6596284,1076,ResumeStateMachineAsyncContext,387,0,0,0

24,6596285,1076,ResumeStateMachineAsyncCallstack,387,0,17,0

25,6596938,1076,CreateStateMachineAsyncContext,388,382,0,0

26,6597671,1076,CompleteStateMachineAsyncContext,387,0,0,0

27,7689963,1076,ResumeStateMachineAsyncContext,388,0,0,0

28,7689964,1076,ResumeStateMachineAsyncCallstack,388,0,44,0

29,7690996,1076,CreateStateMachineAsyncContext,389,382,0,0

30,7691487,1076,CompleteStateMachineAsyncContext,388,0,0,0

31,8784625,1076,ResumeStateMachineAsyncContext,389,0,0,0

32,8784626,1076,ResumeStateMachineAsyncCallstack,389,0,32,0

33,8786264,1076,CreateStateMachineAsyncContext,390,382,0,0

34,8786863,1076,CompleteStateMachineAsyncContext,389,0,0,0

35,9877755,1076,ResumeStateMachineAsyncContext,390,0,0,0

36,9877756,1076,ResumeStateMachineAsyncCallstack,390,0,12,0

37,9878847,1076,CreateStateMachineAsyncContext,391,382,0,0

38,9880509,1076,CompleteStateMachineAsyncContext,390,0,0,0

39,10971211,1076,ResumeStateMachineAsyncContext,391,0,0,0

40,10971212,1076,ResumeStateMachineAsyncCallstack,391,0,46,0

41,10972248,1076,CreateStateMachineAsyncContext,392,382,0,0

42,10972564,1076,CompleteStateMachineAsyncContext,391,0,0,0

43,12064730,1076,ResumeStateMachineAsyncContext,392,0,0,0

44,12064731,1076,ResumeStateMachineAsyncCallstack,392,0,15,0

45,12065418,1076,CreateStateMachineAsyncContext,393,382,0,0

46,12065729,1076,CompleteStateMachineAsyncContext,392,0,0,0

47,13158592,1076,ResumeStateMachineAsyncContext,393,0,0,0

48,13158593,1076,ResumeStateMachineAsyncCallstack,393,0,17,0

49,13159490,1076,CreateStateMachineAsyncContext,394,382,0,0

50,13159925,1076,CompleteStateMachineAsyncContext,393,0,0,0

51,14252613,1076,ResumeStateMachineAsyncContext,394,0,0,0

52,14252614,1076,ResumeStateMachineAsyncCallstack,394,0,31,0

53,14253521,1076,CreateStateMachineAsyncContext,395,382,0,0

54,14253879,1076,CompleteStateMachineAsyncContext,394,0,0,0

55,15346046,1076,ResumeStateMachineAsyncContext,395,0,0,0

56,15346047,1076,ResumeStateMachineAsyncCallstack,395,0,20,0

57,15346809,1076,CreateStateMachineAsyncContext,396,382,0,0

58,15347202,1076,CompleteStateMachineAsyncContext,395,0,0,0

59,16441253,1076,ResumeStateMachineAsyncContext,396,0,0,0

60,16441254,1076,ResumeStateMachineAsyncCallstack,396,0,24,0

61,16442338,1076,CreateStateMachineAsyncContext,397,382,0,0

62,16442696,1076,CompleteStateMachineAsyncContext,396,0,0,0

63,17533272,1076,ResumeStateMachineAsyncContext,397,0,0,0

64,17533273,1076,ResumeStateMachineAsyncCallstack,397,0,17,0

65,17533954,

Stack trace:

   at System.Threading.Tasks.Tests.AsyncProfilerTests.Wrap(EventDump dump, Action assert) in /_/src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/System.Runtime.CompilerServices/AsyncProfilerTests.cs:line 1583
   at System.Threading.Tasks.Tests.AsyncProfilerTests.AssertTrue(EventDump dump, Boolean condition, String message) in /_/src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/System.Runtime.CompilerServices/AsyncProfilerTests.cs:line 1587
   at System.Threading.Tasks.Tests.AsyncProfilerTests.StateMachineAsync_CallstackStressWithVaryingDepths() in /_/src/libraries/System.Runtime/tests/System.Threading.Tasks.Tests/System.Runtime.CompilerServices/AsyncProfilerV1Tests.cs:line 1462
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args) in /_/src/coreclr/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.CoreCLR.cs:line 37
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr) in /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs:line 57