[ci-scan] Known Build Error: SwiftErrorHandling.TestSwiftErrorThrown fails in runtime-interpreter

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Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1410560
Build error leg or test failing: osx arm64 Checked-Interop/Swift/SwiftErrorHandling/SwiftErrorHandling/SwiftErrorHandling.cmd

Error Message

{
  "ErrorMessage": "Xunit.Sdk.TrueException: A Swift error was expected to be thrown.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

ErrorHandlingTests.TestSwiftErrorThrown() fails in runtime-interpreter (def 316) under CoreCLR interpreter mode. The test asserts that a Swift error propagates through the reverse-P/Invoke boundary, but the interpreter does not implement the Swift error-return calling-convention path (SwiftError* parameter), so no error is set and the assertion fails.

Affected pipelines (2 confirmed failing builds):

• runtime-interpreter (def 316): osx-arm64 Checked and osx-x64 Checked — builds 1410560, 1407440

Errors log:

BEGIN EXECUTION
corerun SwiftErrorHandling.dll
Xunit.Sdk.TrueException: A Swift error was expected to be thrown.
   at Xunit.Assert.True(Boolean condition, String userMessage)
END EXECUTION - FAILED
Test Harness Exitcode is : 1

First build it occurred: Build 1407440 (May 4, 2026) is the earliest in the scanned window. Occurrence count in window: 2. This is computed within the scanned window and may not be the true origin.

Recommended action:

• Owner: @dotnet/interop-contrib, Swift interop area
• Root cause: CoreCLR interpreter does not implement the Swift error-result calling convention; SwiftError* register is never set, so ErrorHandlingTests.TestSwiftErrorThrown() never sees a thrown error.
• Investigate src/tests/Interop/Swift/SwiftErrorHandling/ and the interpreter's Swift interop callsite generation.
• Short-term: add [SkipOnCoreClr("Swift error calling convention not supported under interpreter", RuntimeTestModes.InterpreterActive)] to ErrorHandlingTests (in a follow-up muting PR once this KBE issue number is known).

Note

🤖 This issue was generated by the CI Outer-Loop Failure Scanner.

Note

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Generated by CI Outer-Loop Failure Scanner · ● 16.2M · ◷

Report

Summary

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

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1410560
Error message validated: [Xunit.Sdk.TrueException: A Swift error was expected to be thrown.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 5/7/2026 8:27:21 AM UTC

Report

Build	Definition	Test	Pull Request
1410560	dotnet/runtime	Interop/Swift/SwiftErrorHandling/SwiftErrorHandling/SwiftErrorHandling.cmd

Summary

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

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1410560
Error message validated: [Xunit.Sdk.TrueException: A Swift error was expected to be thrown.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 5/7/2026 8:27:21 AM UTC

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