Mono iOS test failures with "The "AppleAppBuilderTask" task failed unexpectedly." in ProxyProjectForAOTOnHelix

[jakobbotsch]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1396034
Build error leg or test failing: System.Runtime.Tests.WorkItemExecution
Pull request: #127336

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "The \"AppleAppBuilderTask\" task failed unexpectedly.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1396034
Error message validated: [The "AppleAppBuilderTask" task failed unexpectedly.]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/25/2026 12:23:46 PM UTC

Report

Build	Repository	Test	Pull Request
1453839	dotnet/runtime	System.Composition.Convention.Tests.WorkItemExecution
1453379	dotnet/runtime	System.Runtime.Caching.Tests.WorkItemExecution
1452872	dotnet/runtime	System.Threading.Timer.Tests.WorkItemExecution
1450787	dotnet/runtime	System.Runtime.Serialization.Formatters.Tests.WorkItemExecution
1449088	dotnet/runtime	Microsoft.Extensions.FileProviders.Physical.Tests.WorkItemExecution
1447125	dotnet/runtime	System.Net.WebProxy.Tests.WorkItemExecution
1446635	dotnet/runtime	System.Net.Primitives.Functional.Tests.WorkItemExecution
1445761	dotnet/runtime	Microsoft.Extensions.FileSystemGlobbing.Tests.WorkItemExecution
1441846	dotnet/runtime	System.Memory.Data.Tests.WorkItemExecution
1440990	dotnet/runtime	System.ValueTuple.Tests.WorkItemExecution	#128408
1441029	dotnet/runtime	System.Runtime.Serialization.Schema.Tests.WorkItemExecution	#128409
1439314	dotnet/runtime	System.Composition.Hosting.Tests.WorkItemExecution	#128705
1438268	dotnet/runtime	System.Reflection.Metadata.Tests.WorkItemExecution
1437574	dotnet/runtime	Microsoft.Bcl.Memory.Tests.WorkItemExecution
1436708	dotnet/runtime	jit64_3.WorkItemExecution	#128586
1428144	dotnet/runtime	System.Private.Uri.Unit.Tests.WorkItemExecution	#125437
1427748	dotnet/runtime	Microsoft.XmlSerializer.Generator.Tests.WorkItemExecution	#124173
1427585	dotnet/runtime	System.Composition.TypedParts.Tests.WorkItemExecution
1427030	dotnet/runtime	System.Diagnostics.Debug.Tests.WorkItemExecution	#125437
1426173	dotnet/runtime	System.Linq.Parallel.Tests.WorkItemExecution	#128284
1424920	dotnet/runtime	System.Text.RegularExpressions.Unit.Tests.WorkItemExecution	#128068
1423053	dotnet/runtime	Microsoft.Extensions.Configuration.EnvironmentVariables.Tests.WorkItemExecution
1422120	dotnet/runtime	Regression_ro_1.WorkItemExecution	#127498

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
2	8	23

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