[tvOS] Invalid IL when compiling `System.Net.Http.Json.Functional.Tests`

[matouskozak]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1116605
Build error leg or test failing: System.Net.Http.Json.Functional.Tests
Commit range: fdf73d8...b622b6b

"/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/xunit.runner.utility.netcoreapp10.dll" "/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/aot-instances.dll"
  
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error : Precompiling failed for /tmp/helix/working/C7260AEC/w/B14F0921/e/publish/aot-instances.dll with exit code 134. [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error : Unable to compile method 'System.Threading.Tasks.Task`1<int> SimpleTestRunner:Main (string[])' due to: 'Invalid IL code in SimpleTestRunner:Main (string[]): IL_0000: ret        [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error :  assembly:<unknown assembly> type:<unknown type> member:(null)'. [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error : Unable to compile method 'System.Collections.Generic.IEnumerable`1<Microsoft.DotNet.XHarness.TestRunners.Common.TestAssemblyInfo> SimpleTestRunner:GetTestAssemblies ()' due to: 'Invalid IL code in SimpleTestRunner:GetTestAssemblies (): IL_0000: ret        [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error :  assembly:<unknown assembly> type:<unknown type> member:(null)'. [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error : Unable to compile method 'System.Nullable`1<int> SimpleTestRunner:get_MaxParallelThreads ()' due to: 'Invalid IL code in SimpleTestRunner:get_MaxParallelThreads (): IL_0000: ret        [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error :  assembly:<unknown assembly> type:<unknown type> member:(null)'. [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error : Unable to compile method 'Microsoft.DotNet.XHarness.TestRunners.Common.IDevice SimpleTestRunner:get_Device ()' due to: 'Invalid IL code in SimpleTestRunner:get_Device (): IL_0000: ret        [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error :  assembly:<unknown assembly> type:<unknown type> member:(null)'. [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error : Unable to compile method 'string SimpleTestRunner:get_IgnoreFilesDirectory ()' due to: 'Invalid IL code in SimpleTestRunner:get_IgnoreFilesDirectory (): IL_0000: ret        [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
/tmp/helix/working/C7260AEC/p/build/apple/AppleBuild.targets(255,5): error :  assembly:<unknown assembly> type:<unknown type> member:(null)'. [/private/tmp/helix/working/C7260AEC/w/B14F0921/e/publish/ProxyProjectForAOTOnHelix.proj]
...

Error Message

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

{
  "ErrorMessage": [
      "AppleBuild.targets(255,5): error : Unable to compile method 'System.Threading.Tasks.Task",
      "IL_0000: ret"
  ],
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1116605
Error message validated: [AppleBuild.targets(255,5): error : Unable to compile method 'System.Threading.Tasks.Task IL_0000: ret]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/11/2025 12:16:28 PM UTC

Report

Build	Definition	Test	Pull Request
1122117	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution	#118611
1121801	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution
1121266	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution
1121056	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution	#118628
1120952	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution	#118628
1120869	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution
1120857	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution	#118611
1120069	dotnet/runtime	System.Net.Http.Json.Functional.Tests.WorkItemExecution	#118622
1119458	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution	#118523
1117650	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution	#118523
1119240	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution
1116605	dotnet/runtime	System.Net.Http.Json.Unit.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
3	12	12

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[kotlarmilos]

@thaystg Could invalid IL code be related to #118458?

[BrzVlad]

@kotlarmilos That can't be the case since looking in the logs the failure happens in compilation with LLVM, which the commit in question doesn't even impact. I suspect some changes in BCL triggered this, hitting some issue in our codegen, will take a look at it.