[ci-scan] Test failure: JIT/opt/ObjectStackAllocation/Runtime_131713 fails under NativeAOT with XmlSerializer parameterless-cons [Content truncated due to length]

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1540632
Build error leg or test failing: linux-x64 Checked NativeAOT_Pri1 - JIT/opt/ObjectStackAllocation/Runtime_131713/Runtime_131713.cmd

Error Details

The Runtime_131713 object-stack-allocation regression test fails on the runtime-nativeaot-outerloop NativeAOT_Pri1 legs (linux-x64, linux-arm, linux-arm64, windows-x64, windows-x86). Under NativeAOT, XmlSerializer.Serialize throws because reflection metadata for the Foo type is trimmed, so the serializer cannot find a parameterless constructor. Expected 100 / Actual 101.

System.InvalidOperationException: There was an error generating the XML document.
 ---> System.InvalidOperationException: Foo cannot be serialized because it does not have a parameterless constructor.
   at System.Xml.Serialization.TypeDesc.CheckSupported()
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type, MemberInfo, Boolean, Boolean)
   at System.Xml.Serialization.ModelScope.GetTypeModel(Type, Boolean)
   at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type, XmlRootAttribute, String)
   at System.Xml.Serialization.XmlSerializer.GetMapping()
   at System.Xml.Serialization.XmlSerializer.SerializeUsingReflection(...)
   at System.Xml.Serialization.XmlSerializer.Serialize(...)
   --- End of inner exception stack trace ---
   at Runtime_131713.Serialize()
   at Runtime_131713.Test()
   at __GeneratedMainWrapper.Main()
Expected: 100
Actual: 101
END EXECUTION - FAILED

Observed in build 1540632 (2026-08-05) and reproduced in follow-up build 1541654 (2026-08-06) on the same NativeAOT legs. (Test name derives from issue #131713, which is closed; this is a distinct NativeAOT serialization failure.)

Error Message

{
  "ErrorMessage": [
    "Foo cannot be serialized because it does not have a parameterless constructor.",
    "at Runtime_131713.Serialize()"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

---

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Generated by CI Outer-Loop Failure Scanner · 554.9 AIC · ⌖ 12.2 AIC · ⊞ 18.3K · ◷

Report

Build	Repository	Test	Pull Request
1542734	dotnet/runtime	JIT\opt\ObjectStackAllocation\Runtime_131713\Runtime_131713.cmd	#131907
1542248	dotnet/runtime	JIT\opt\ObjectStackAllocation\Runtime_131713\Runtime_131713.cmd

Summary

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

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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[JulieLeeMSFT]

@AndyAyersMS, PTAL.