[Crossgen2 CI] crossgen2-comparison windows x86: Create cross-platform crossgen baseline fails with dotnet.exe not found

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Failure Details

• Pipeline: runtime-coreclr crossgen2 outerloop
• Build: 1361393
• Job: Test crossgen2-comparison build windows x86 Release
• Failed Task: Create cross-platform crossgen baseline
• Configuration: windows / x86 / Release
• Error Category: build-error

Failing Tests

Test Name	Platform	Error Type
crossgen2-comparison crossgen_framework	windows-x86	Python script exit code 1

Error Output

The python script crossgen2_comparison.py processes all 236 framework assemblies but fails because dotnet.exe cannot be found.

Error details

[command]C:\python3\python.exe D:\a\_work\1\s\src\tests\Common\scripts\crossgen2_comparison.py crossgen_framework
  --crossgen D:\a\_work\1\s\artifacts\bin\crossgen2_inbuild\x86\Release\crossgen2.dll
  --dotnet D:\a\_work\1\s\dotnet.cmd
  --core_root D:\a\_work\1\s\artifacts\tests\coreclr\windows.x86.Release\Tests\CrossCompileRoot\dlls
  --result_dir D:\a\_work\1\s\artifacts\tests\coreclr\windows.x86.Release\Tests\CrossCompileRoot\log
  --target_os windows --target_arch x86 --compiler_arch_os windows_x64

D:\a\_work\1\s\src\tests\Common\scripts\crossgen2_comparison.py:250: DeprecationWarning: There is no current event loop
  loop = asyncio.get_event_loop()

' stderr'The system cannot find the file specified.

'"\dotnet.exe"' is not recognized as an internal or external command,
operable program or batch file.

[236:236]: D:\a\_work\1\s\artifacts\bin\crossgen2_inbuild\x86\Release\crossgen2.dll WindowsBase.dll

##[error]The process 'C:\python3\python.exe' failed with exit code 1

Regression Details

• Previous outerloop build 1359430 (2026-03-31): Test crossgen2-comparison build windows x86 Release passed
• Current build 1361393 (2026-04-01): fails

This is a new regression. A similar failure on windows x64 was previously tracked in #13 and appeared to have resolved; this x86 variant is new.

Analysis

The error '"\dotnet.exe"' is not recognized indicates a path resolution issue in the crossgen2 comparison infrastructure:

1. The script is invoked with --dotnet D:\a\_work\1\s\dotnet.cmd (the repo-root wrapper)
2. dotnet.cmd appears to resolve to a bare \dotnet.exe path that doesn't exist
3. The script proceeds to process all 236 assemblies (some may succeed via a fallback path) but ultimately exits with code 1 due to the earlier error

The quoting pattern '"\dotnet.exe"' in the error suggests either:

• The dotnet.cmd wrapper is producing a malformed path with double-quotes
• The python script src/tests/Common/scripts/crossgen2_comparison.py is incorrectly quoting or resolving the --dotnet argument

Recommended Action

This failure requires investigation of the dotnet path resolution in the crossgen2 comparison pipeline:

1. Check src/tests/Common/scripts/crossgen2_comparison.py around line 250 and wherever it invokes dotnet.cmd / dotnet.exe
2. Examine dotnet.cmd at the repo root to understand how it resolves the actual dotnet SDK path
3. Look for recent changes to the crossgen2-comparison pipeline YAML (eng/pipelines/coreclr/crossgen2-comparison.yml) or the python script that may have altered path handling
4. Compare the PATH and environment between the passing build (1359430) and failing build (1361393)

CI Log

• Task log

Generated by Crossgen2 CI Failure Triage · ◷

• expires on May 1, 2026, 2:31 PM UTC

[github-actions]

Auto-Closed: Not Reproducing

This failure has not reproduced in the last 3 outerloop builds on main (builds 1383370, 1379594, 1377654). The crossgen2-comparison windows x86 failure has not been seen for more than 7 days. Closing as no longer reproducing. Reopen if the failure recurs.