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[area-Tools-ILLink]: The given key 'Maui.Health.Services.HealthService/<WriteHealthData>d__17`1' was not present in the dictionary #122800

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[area-Tools-ILLink]: The given key 'Maui.Health.Services.HealthService/<WriteHealthData>d__17`1' was not present in the dictionary#122800
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area-Tools-ILLink.NET linker development as well as trimming analyzersuntriagedNew issue has not been triaged by the area owner
@Kebechet

Description

@Kebechet
Kebechet
opened on Dec 31, 2025

Description

When publishing a .NET MAUI iOS app in Release (trimming enabled by default for iOS publish), ILLink crashes with an internal exception (IL1012)

The crash is a KeyNotFoundException for a compiler-generated async state machine type of a generic method:

  • Maui.Health.Services.HealthService/<GetHealthDataAsync>d__12\1`

The problem is in the Maui.Health dependency

Related to:

Reproduction Steps

  1. Create a new .NET MAUI app targeting iOS (net10.0-ios).
  2. Add NuGet package:
    • Kebechet.Maui.Health version 2.0.0 (or any version that contains the same public generic async method shape).
  3. Reference the library in code (just calling the API is enough, example below).
  4. Publish in Release for iOS:

For some reason even local publish worked but it was still crashing in the pipeline

Expected behavior

Pipeline should succeed and the liner should crash on analysis of:
public async partial Task<List<TDto>> GetHealthData<TDto>(HealthTimeRange timeRange, CancellationToken cancellationToken)

and

public async partial Task<bool> WriteHealthData<TDto>(TDto data, CancellationToken cancellationToken) where TDto : HealthMetricBase

Actual behavior

The linker crashes with

/Users/runner/work/SatisFIT/SatisFIT/src/Client/SatisFIT.Client.App/MainPage.xaml(14,30): XamlC warning XC0025: Binding was not compiled because it has an explicitly set Source property and compilation of bindings with Source is not enabled. Consider enabling this optimization by setting the <MauiEnableXamlCBindingWithSourceCompilation>true</MauiEnableXamlCBindingWithSourceCompilation> in your project file and make sure the correct x:DataType is specified for this binding. See https://learn.microsoft.com/dotnet/maui/fundamentals/data-binding/compiled-bindings for more information. [/Users/runner/work/SatisFIT/SatisFIT/src/Client/SatisFIT.Client.App/SatisFIT.Client.App.csproj::TargetFramework=net10.0-ios]
  SatisFIT.Client.App -> /Users/runner/work/SatisFIT/SatisFIT/src/Client/SatisFIT.Client.App/bin/Release/net10.0-ios/ios-arm64/SatisFIT.Client.App.dll
  Optimizing assemblies for size may change the behavior of the app. Be sure to test after publishing. See: https://aka.ms/dotnet-illink
  Optimizing assemblies for size. This process might take a while.
ILLink : error IL1012: IL Trimmer has encountered an unexpected error. Please report the issue at https://aka.ms/report-illink [/Users/runner/work/SatisFIT/SatisFIT/src/Client/SatisFIT.Client.App/SatisFIT.Client.App.csproj::TargetFramework=net10.0-ios]
  Fatal error in IL Linker
  Unhandled exception. System.Collections.Generic.KeyNotFoundException: The given key 'Maui.Health.Services.HealthService/<WriteHealthData>d__17`1' was not present in the dictionary.
     at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
     at Mono.Linker.Dataflow.CompilerGeneratedState.<GetCompilerGeneratedStateForType>g__MapGeneratedTypeTypeParameters|11_2(TypeDefinition generatedType, Dictionary`2 generatedTypeToTypeArgs, LinkContext context)
     at Mono.Linker.Dataflow.CompilerGeneratedState.<GetCompilerGeneratedStateForType>g__MapGeneratedTypeTypeParameters|11_2(TypeDefinition generatedType, Dictionary`2 generatedTypeToTypeArgs, LinkContext context)
     at Mono.Linker.Dataflow.CompilerGeneratedState.GetCompilerGeneratedStateForType(TypeDefinition type)
     at Mono.Linker.Dataflow.CompilerGeneratedState.GetGeneratedTypeAttributes(TypeDefinition generatedType)
     at ILLink.Shared.TrimAnalysis.FlowAnnotations.GetGeneratedTypeAttributes(TypeDefinition typeDef)
     at ILLink.Shared.TrimAnalysis.FlowAnnotations.BuildTypeAnnotations(TypeDefinition type)
     at ILLink.Shared.TrimAnalysis.FlowAnnotations.GetAnnotations(TypeDefinition type)
     at ILLink.Shared.TrimAnalysis.FlowAnnotations.GetTypeAnnotation(TypeDefinition type)
     at Mono.Linker.Dataflow.DynamicallyAccessedMembersTypeHierarchy.ProcessMarkedTypeForDynamicallyAccessedMembersHierarchy(TypeDefinition type)
     at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkTypeVisibleToReflection(TypeReference type, DependencyInfo& reason, MessageOrigin& origin)
     at Mono.Linker.Steps.MarkStep.MarkEntireType(TypeDefinition type, DependencyInfo& reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkEntireType(TypeDefinition type, DependencyInfo& reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkEntireAssembly(AssemblyDefinition assembly, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkAssembly(AssemblyDefinition assembly, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkModule(ModuleDefinition module, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkGenericArguments(IGenericInstance instance, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.GetOriginalType(TypeReference type, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkField(FieldDefinition field, DependencyInfo& reason, MessageOrigin& origin)
     at Mono.Linker.Steps.MarkStep.MarkField(FieldReference reference, DependencyInfo reason, MessageOrigin& origin)
     at Mono.Linker.Steps.MarkStep.MarkFieldVisibleToReflection(FieldReference field, DependencyInfo& reason, MessageOrigin& origin)
     at Mono.Linker.Steps.MarkStep.MarkFieldsVisibleToReflection(TypeDefinition type, DependencyInfo& reason, MessageOrigin origin, Boolean markBackingFieldsOnlyIfPropertyMarked)
     at Mono.Linker.Steps.MarkStep.MarkEntireType(TypeDefinition type, DependencyInfo& reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkEntireType(TypeDefinition type, DependencyInfo& reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkEntireAssembly(AssemblyDefinition assembly, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkAssembly(AssemblyDefinition assembly, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.MarkModule(ModuleDefinition module, DependencyInfo reason, MessageOrigin origin)
     at Mono.Linker.Steps.MarkStep.ProcessMarkedPending()
     at Mono.Linker.Steps.MarkStep.Initialize()
     at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
     at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
     at Mono.Linker.Pipeline.Process(LinkContext context)
     at Mono.Linker.Driver.Run(ILogger customLogger)
     at Mono.Linker.Driver.Main(String[] args)
Error: /Users/runner/.nuget/packages/microsoft.net.illink.tasks/10.0.1/build/Microsoft.NET.ILLink.targets(103,5): error NETSDK1144: Optimizing assemblies for size failed. [/Users/runner/work/SatisFIT/SatisFIT/src/Client/SatisFIT.Client.App/SatisFIT.Client.App.csproj::TargetFramework=net10.0-ios]
Error: Process completed with exit code 1.

Regression?

dunno

Known Workarounds

fixed the ILLinker crash by removing the async state machine on the public generic method.
Kebechet/Maui.Health#8

Concrete fix commits:

Configuration

Current runner version: '2.330.0'
Runner Image Provisioner
Hosted Compute Agent
Version: 20251211.462
Commit: 6cbad8c2bb55d58165063d031ccabf57e2d2db61
Build Date: 2025-12-11T16:28:49Z
Worker ID: {99019fec-2f3d-4407-9b62-e7fa8973ab04}
Operating System
macOS
26.0.1
25A362
Runner Image
Image: macos-26-arm64
Version: 20251216.0100.1
Included Software: https://github.com/actions/runner-images/blob/macos-26-arm64/20251216.0100/images/macos/macos-26-arm64-Readme.md
Image Release: https://github.com/actions/runner-images/releases/tag/macos-26-arm64%2F20251216.0100

DOTNET_SDK_VERSION: "10.0.101"
WORKLOAD_SET_VERSION: "10.0.101.1" # https://github.com/dotnet/macios/releases
TARGET_FRAMEWORK: net10.0-ios
XCODE_VERSION: "26.2"
BUILD_CONFIGURATION: Release

dotnet publish command

 dotnet publish src/Client/SatisFIT.Client.App/SatisFIT.Client.App.csproj -c Release -f net10.0-ios -o ~/artifacts --no-restore --p:NoDSymUtil=false --p:ApplicationDisplayVersion="20.5.3" --p:ApplicationVersion="587" --p:RuntimeIdentifier=ios-arm64 --p:ArchiveOnBuild=True --p:CodesignKey="Apple Distribution: John Doe (AAAAAAA)" --p:CodesignProvision="SatisFIT-profile"

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