[ci-scan] Test failure: Regression_o_2 browser-wasm R2R platform incompatibilities

[tannergooding]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1581938
Build error leg or test failing: coreclr Pri1 Runtime Tests Run browser wasm checked R2R_CG2 - Regression_o_2
Pull request: #133206
Console log: https://helixr1107v0xdcypoyl9e7f.blob.core.windows.net/dotnet-runtime-refs-pull-133206-merge-a3b88aaf22c042c488/Regression_o_2/1/console.442a0e08.log?helixlogtype=result

KBE authoring guidance (ci-failure-scan)

• Error Details is for readers. The exception excerpts below identify both failures from the merged work item.
• Build Analysis parses only the JSON block under Error Message.
• ErrorMessage uses ordered, case-sensitive ordinal String.Contains matches copied from the failing log.
• This is deterministic test coverage, not an infrastructure retry case.

Error Details

Running test: global::Runtime_117566.TestEntryPoint()
System.ArgumentException: Path "" is not an absolute path. (Parameter 'assemblyPath')
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String assemblyPath)
   at Runtime_117566.TestEntryPoint()
Failed test: global::Runtime_117566.TestEntryPoint()

Running test: global::Runtime_58874.Runtime_58874.TestEntryPoint()
System.DllNotFoundException: Unable to load shared library 'kernel32' or one of its dependencies.
dynamic linking not enabled
   at Runtime_58874.Runtime_58874.EndOfPage.Create()
   at Runtime_58874.Runtime_58874.TestEntryPoint()
Failed test: global::Runtime_58874.Runtime_58874.TestEntryPoint()

Likely Cause

PR #133134 added the parallel browser-wasm ReadyToRun lane that Crossgen2-compiles and executes merged regression runners. Its merge commit is present in this build, and the new lane now executes Regression_o_2 under browser-wasm R2R.

Runtime_117566 assumes Assembly.GetExecutingAssembly().Location is a usable file path. Browser-wasm assemblies have no location, so the value is empty by design and LoadFromAssemblyPath rejects it.

Runtime_58874 contains a kernel32 allocation path and fails resolving that native library in browser-wasm, where dynamic linking is unavailable.

These tests need browser-wasm/ReadyToRun applicability guards or equivalent platform-safe setup before the merged runner can pass in the new lane.

Error Message

{
  "ErrorMessage": [
    "global::Runtime_117566.TestEntryPoint()",
    "Path \"\" is not an absolute path.",
    "global::Runtime_58874.Runtime_58874.TestEntryPoint()",
    "dynamic linking not enabled"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 1 console log

Note

This issue was prepared with GitHub Copilot assistance and reviewed by the submitting developer.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1581938
Error message validated: [global::Runtime_117566.TestEntryPoint() Path "" is not an absolute path. global::Runtime_58874.Runtime_58874.TestEntryPoint() dynamic linking not enabled]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/4/2026 8:31:28 PM UTC

Report

Build	Repository	Test	Pull Request
1583554	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#131826
1583511	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#133253
1583514	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#133252
1583502	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#133215
1583460	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#133248
1583457	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#133213
1581938	dotnet/runtime	global::Runtime_58874.Runtime_58874.TestEntryPoint()	#133206

Summary

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

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Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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[JulieLeeMSFT]

@AndyAyersMS, @davidwrighton, PTAL.