JIT/Directed/refbyref/byref2iu_d/byref2iu_d fails in ilasmroundtrip

[jakobbotsch]

Example pipeline run: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1516260&view=results
Example console log: https://helixr1107v0xdcypoyl9e7f.blob.core.windows.net/dotnet-runtime-refs-heads-main-7b8d78afe7fc44e3b5/Directed_3/1/console.4835b41d.log?helixlogtype=result

20:57:52.341 Running test: JIT/Directed/refbyref/byref2iu_d/byref2iu_d.dll

Assert failure(PID 11008 [0x00002b00], Thread: 4584 [0x11e8]): Assertion failed 'genActualTypeIsInt(value)' in 'byref2iu:Main():int' during 'Morph - Global' (IL size 189; hash 0x27f1e098; MinOpts)

    File: D:\a\_work\1\s\src\coreclr\jit\morph.cpp:3497
    Image: C:\h\w\BB2E09D8\p\corerun.exe

Exit Code: -1073740286
Expected: 100
Actual: -1073740286
END EXECUTION - FAILED
FAILED

This didn't fail in the run on July 11th, so seems like something changed recently.

Known Issue Error Message

DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

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

{
  "ErrorMessage": "Assertion failed 'genActualTypeIsInt(value)' in 'byref2iu",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1516260
Error message validated: [Assertion failed 'genActualTypeIsInt(value)' in 'byref2iu]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/24/2026 3:52:50 PM UTC

Report

Build	Repository	Test	Pull Request
1525692	dotnet/runtime	Directed_3.WorkItemExecution	#127297
1516260	dotnet/runtime	Directed_3.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
1	2	2

[dotnet-policy-service]

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

[JulieLeeMSFT]

@adamperlin, PTAL. cc @dotnet/jit-contrib.

[am11]

@jakobbotsch, could you please convert it to tracking issue so BA doesn't flag on unrelated PRs?

[JulieLeeMSFT]

cc @AndyAyersMS.

[adamperlin]

For an update, I did manage to repro this and am trying to pin down the specific commit that introduced it.