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tvos-arm64 Mono AOT precompilation fails with Invalid IL code for multiple test assemblies #126458

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Description

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1362636
Build error leg or test failing: System.Net.NameResolution.Functional.Tests.WorkItemExecution, System.Reflection.Context.Tests.WorkItemExecution, System.Text.Encoding.Extensions.Tests.WorkItemExecution
Pull request: #125441

Affected CI jobs: build_tvos_arm64_Release_AllSubsets_Mono

Error Message

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

{
 "ErrorMessage": "Precompiling failed",
 "ErrorPattern": "",
 "BuildRetry": false,
 "ExcludeConsoleLog": false
}

Summary

On tvos-arm64 Mono Release (AOT mode), the Mono AOT compiler fails to precompile test assemblies with "Invalid IL code" errors:

Precompiling failed for aot-instances.dll with exit code 134
Unable to compile method ... due to: 'Invalid IL code in ...: IL_0000: ret'

3 work items affected:

  • System.Net.NameResolution.Functional.Tests
  • System.Reflection.Context.Tests
  • System.Text.Encoding.Extensions.Tests

Note

This issue was filed with the assistance of GitHub Copilot.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1362636
Error message validated: [Precompiling failed]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/2/2026 10:17:08 AM UTC

Report

Build Repository Test Pull Request
1472657 dotnet/runtime System.Diagnostics.TextWriterTraceListener.Tests.WorkItemExecution
1472667 dotnet/runtime System.Runtime.Tests.WorkItemExecution
1470048 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1469347 dotnet/runtime iOS.Device.ExportManagedSymbols.Test.WorkItemExecution
1469350 dotnet/runtime System.Runtime.Numerics.Tests.WorkItemExecution
1469354 dotnet/runtime iOS.Device.Aot.Test.WorkItemExecution #129440
1468533 dotnet/runtime System.Runtime.Serialization.Json.Tests.WorkItemExecution #129514
1468488 dotnet/runtime iOS.Device.ExportManagedSymbols.Test.WorkItemExecution #129375
1467678 dotnet/runtime System.Xml.Schema.Extensions.Tests.WorkItemExecution
1465808 dotnet/runtime System.Formats.Asn1.Tests.WorkItemExecution
1465781 dotnet/runtime System.Text.RegularExpressions.Unit.Tests.WorkItemExecution
1465282 dotnet/runtime System.Composition.Hosting.Tests.WorkItemExecution
1464635 dotnet/runtime System.IO.FileSystem.DisabledFileLocking.Tests.WorkItemExecution
1464480 dotnet/runtime Microsoft.XmlSerializer.Generator.Tests.WorkItemExecution
1460065 dotnet/runtime System.Globalization.Tests.WorkItemExecution
1463828 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1463443 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution #128409
1463147 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1462467 dotnet/runtime System.Runtime.Tests.WorkItemExecution #129355
1462616 dotnet/runtime tvOS.Device.Aot.Test.WorkItemExecution
1461575 dotnet/runtime Invariant.Tests.WorkItemExecution
1461002 dotnet/runtime System.Formats.Nrbf.Tests.WorkItemExecution
1460723 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1459629 dotnet/runtime System.Globalization.CalendarsWithConfigSwitch.Tests.WorkItemExecution
1459621 dotnet/runtime System.Globalization.Calendars.Tests.WorkItemExecution #129226
1459328 dotnet/runtime Microsoft.Extensions.HostFactoryResolver.Tests.WorkItemExecution #125437
1458274 dotnet/runtime System.Runtime.Tests.WorkItemExecution #129195
1457550 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution #129226
1457553 dotnet/runtime System.Memory.Tests.WorkItemExecution #125437
1457564 dotnet/runtime System.Runtime.Tests.WorkItemExecution #129195
1456913 dotnet/runtime System.Runtime.Tests.WorkItemExecution #128224
1456365 dotnet/runtime System.Diagnostics.Process.Tests.WorkItemExecution
1455662 dotnet/runtime System.Drawing.Primitives.Tests.WorkItemExecution
1455366 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1453839 dotnet/runtime System.ComponentModel.TypeConverter.Tests.WorkItemExecution
1453379 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1452872 dotnet/runtime System.Xml.Linq.Events.Tests.WorkItemExecution
1450787 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1450155 dotnet/runtime System.Globalization.Calendars.Tests.WorkItemExecution
1449323 dotnet/runtime System.Globalization.Tests.WorkItemExecution
1449088 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1447125 dotnet/runtime System.Runtime.Serialization.Xml.ReflectionOnly.Tests.WorkItemExecution
1447485 dotnet/runtime System.Diagnostics.Debug.Tests.WorkItemExecution
1447487 dotnet/runtime System.Runtime.Tests.WorkItemExecution #128218
1446635 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1445761 dotnet/runtime System.Diagnostics.StackTrace.Tests.WorkItemExecution
1444966 dotnet/runtime System.Net.Http.Json.Functional.Tests.HttpClientJsonExtensionsTests.GetFromJsonAsync_EnforcesMaxResponseContentBufferSize
1443952 dotnet/runtime Microsoft.Extensions.FileProviders.Physical.Tests.WorkItemExecution
1442805 dotnet/runtime System.Security.Cryptography.Cose.Tests.WorkItemExecution
1442382 dotnet/runtime System.Threading.Tests.WorkItemExecution
1442260 dotnet/runtime WBT-NoWebcil-MONO-ST-Wasm.Build.Tests.MainWithArgsTests.WorkItemExecution
1441664 dotnet/runtime WBT-Workloads-MONO-ST-Wasm.Build.Tests.SatelliteAssembliesTests.WorkItemExecution #128606
1442058 dotnet/runtime WBT-NoWebcil-MONO-ST-Wasm.Build.Tests.IcuTests.WorkItemExecution #128799
1441846 dotnet/runtime System.Xml.Linq.TreeManipulation.Tests.WorkItemExecution
1440990 dotnet/runtime System.Security.Cryptography.Xml.Tests.WorkItemExecution #128408
1441232 dotnet/runtime Microsoft.Extensions.Hosting.Systemd.Tests.WorkItemExecution
1441485 dotnet/runtime WBT-Workloads-MONO-ST-Wasm.Build.NativeRebuild.Tests.OptimizationFlagChangeTests.WorkItemExecution #128423
1441029 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution #128409
1440694 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution #127498
1440890 dotnet/runtime WBT-NoWebcil-MONO-ST-Wasm.Build.Tests.IcuShardingTests.WorkItemExecution #128705
1440408 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution #128448
1440191 dotnet/runtime System.Text.Json.Tests.WorkItemExecution
1439314 dotnet/runtime tvOS.Device.Aot.Test.WorkItemExecution #128705
1438268 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution
1437078 dotnet/runtime System.Runtime.Loader.Tests.WorkItemExecution #128404
1436493 dotnet/runtime System.Xml.Linq.Properties.Tests.WorkItemExecution
1436708 dotnet/runtime System.Xml.Linq.SDMSample.Tests.WorkItemExecution #128586
1435940 dotnet/runtime System.Runtime.Loader.RefEmitLoadContext.Tests.WorkItemExecution #128448

Summary

24-Hour Hit Count 7-Day Hit Count 1-Month Count
0 2 68

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