[ci-scan] Build break: SYSLIB1064 in AppleTestRunner.cs blocks Apple NativeAOT test legs

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596986 Build error leg or test failing: iossimulator-x64 Release AllSubsets_NativeAOT-Build product

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Error Details

src/libraries/Common/tests/AppleTestRunner/AppleTestRunner.cs(24,33): error SYSLIB1064: Method 'mono_ios_append_output' with 'LibraryImportAttribute' must be marked 'safe' or 'unsafe' ((learn.microsoft.com/redacted) [src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/System.Text.Json.SourceGeneration.Roslyn4.4.Tests.csproj::TargetFramework=net11.0]
src/libraries/Common/tests/AppleTestRunner/AppleTestRunner.cs(27,33): error SYSLIB1064: Method 'mono_ios_set_summary' with 'LibraryImportAttribute' must be marked 'safe' or 'unsafe' ((learn.microsoft.com/redacted) [src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/System.Text.Json.SourceGeneration.Roslyn4.4.Tests.csproj::TargetFramework=net11.0]

Build FAILED.
    0 Warning(s)
    4 Error(s)

The AppleTestRunner.cs test-support source fails to compile on Apple NativeAOT test legs of runtime-extra-platforms: the LibraryImport-generated mono_ios_append_output / mono_ios_set_summary P/Invoke stubs are flagged by SYSLIB1064 (the method must be marked safe/unsafe). Because this is a Build product failure, Send to Helix is skipped and the affected Apple NativeAOT legs (iossimulator, tvos, maccatalyst) never run their tests. First observed in build 1596986 (2026-09-15) and still failing in build 1598688 (2026-09-16).

Error Message

{
  "ErrorMessage": "error SYSLIB1064: Method 'mono_ios_append_output' with 'LibraryImportAttribute' must be marked 'safe' or 'unsafe'",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Workflow artifact: ci-failure-scan Artifact kind: kbe-verification Verified match count: 6 hits in failure.log

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

[!NOTE] This issue was generated by the ci-failure-scan Copilot agentic workflow.

Generated by CI Outer-Loop Failure Scanner · opus48 · 1K AIC · ⌖ 19.8 AIC · ⊞ 19.7K · ◷

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