[ci-scan] Build break: crossgen2_comparison.py fails with Python 3.14 asyncio

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1455403
Build error leg or test failing: Test crossgen2-comparison osx arm64 Release to arm64 OSX

Error Details

The crossgen2_comparison.py script fails on macOS Helix agents running Python 3.14 because asyncio.get_event_loop() raises RuntimeError when called outside an async context — a breaking change in Python 3.14.

+ python3 -u /tmp/helix/working/.../crossgen2_comparison.py crossgen_framework ...
Traceback (most recent call last):
  File ".../crossgen2_comparison.py", line 1007, in <module>
    func = args.func(args)
  File ".../crossgen2_comparison.py", line 741, in crossgen_framework
    helper.run_to_completion(run_crossgen_helper)
  File ".../crossgen2_comparison.py", line 250, in run_to_completion
    loop = asyncio.get_event_loop()
  File ".../python3.14/asyncio/events.py", line 715, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
                       % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'MainThread'.

Affected legs:

• runtime-coreclr crossgen2 outerloop (def 134): Test crossgen2-comparison osx arm64 Release

First build it occurred:

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1453419
• Finished: 2026-06-08

Error Message

{
  "ErrorMessage": ["crossgen2_comparison.py", "There is no current event loop in thread"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

---

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Note

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• #124417 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
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Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0