Unexpected value 'Unknown' of type 'Microsoft.CodeAnalysis.CSharp.AccessorKind'

[rmontanob0830]

Hey all, not sure if this would be the correct channel for internal requests, code is accessible through ADO:

Version Used:

Microsoft Visual Studio Enterprise 2022 (64-bit) - Current
Version 17.13.6

Trying to compile a .NET 8 SDK style project

Roslyn: .nuget\packages\oss.roslynanalysis\1.4.10\

Steps to Reproduce:

1. Trying to build the project
2. Compilation fails with message: "csc.exe" exited with code -2146232797.
3. Did a crash dump on csc.exe, found this error message there:

Unhandled exception at 0x00007FFB08201BC7 (Microsoft.CodeAnalysis.ni.dll) in csc.exe.dmp
Source: "Microsoft.CodeAnalysis.CSharp

Also, a message started appearing on VS:

Feature 'Diagnostic analyzer runner' is currently unavailable due to an internal error. (pasting stack trace down below)

A minimal repro, with source-code provided, is ideal. Most compiler/language issues can be distilled into a snippet that can be pasted into sharplab.

Diagnostic Id: N/A, although not sure if you can provide instructions to get it.

Expected Behavior:

• No crash at compilation time other than code errors

Actual Behavior:

• csc.exe crashes while compiling
• The 'Diagnostic analyzer runner' crashes

Crash dump info:

	Name	Value	Type
◢	$exception	{"Unexpected value 'Unknown' of type 'Microsoft.CodeAnalysis.CSharp.AccessorKind'"}	System.InvalidOperationException

	Name	Value	Type
	StackTrace	" at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.MethodInfo.Create(PropertySymbol property, AccessorKind accessorKind)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitIndexerAccess(BoundIndexerAccess node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitNameOfOperator(BoundNameOfOperator node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitArgumentsAndGetArgumentPlaceholders(BoundExpression receiverOpt, ImmutableArray1 arguments)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitObjectCreationExpressionBase(BoundObjectCreationExpressionBase node)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitObjectCreationExpression(BoundObjectCreationExpression node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitConversion(BoundConversion node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitThrowStatement(BoundThrowStatement node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitList[T](ImmutableArray1 list)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitBlock(BoundBlock node)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitBlock(BoundBlock node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuardWithoutRecursionOnTheLeftOfBinaryOperator.VisitIfStatement(BoundIfStatement node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitList[T](ImmutableArray1 list)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitBlock(BoundBlock node)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitBlock(BoundBlock node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitTryStatement(BoundTryStatement node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitList[T](ImmutableArray1 list)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitBlock(BoundBlock node)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitBlock(BoundBlock node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitNonConstructorMethodBody(BoundNonConstructorMethodBody node)\r\n at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuard.Visit(BoundNode node)\r\n at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.Analyze(CSharpCompilation compilation, MethodSymbol symbol, BoundNode node, BindingDiagnosticBag diagnostics)\r\n at Microsoft.CodeAnalysis.CSharp.MethodCompiler.BindMethodBody(MethodSymbol method, TypeCompilationState compilationState, BindingDiagnosticBag diagnostics, Boolean includeInitializersInBody, BoundNode initializersBody, Boolean reportNullableDiagnostics, ImportChain& importChain, Boolean& originalBodyNested, Boolean& prependedDefaultValueTypeConstructorInitializer, InitialState& forSemanticModel)\r\n at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState)\r\n at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType)\r\n at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.b__0()"	string

Feature 'Diagnostic analyzer runner' is currently unavailable due to an internal error stack trace:

StreamJsonRpc.RemoteInvocationException: Unexpected value 'Unknown' of type 'Microsoft.CodeAnalysis.CSharp.AccessorKind'
   at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__156`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.BrokeredServiceConnection`1.<TryInvokeAsync>d__18`1.MoveNext()
RPC server exception:
System.InvalidOperationException: Unexpected value 'Unknown' of type 'Microsoft.CodeAnalysis.CSharp.AccessorKind'
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.MethodInfo.Create(PropertySymbol property, AccessorKind accessorKind)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitIndexerAccess(BoundIndexerAccess node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitNameOfOperator(BoundNameOfOperator node)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitArgumentsAndGetArgumentPlaceholders(BoundExpression receiverOpt, ImmutableArray`1 arguments)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitObjectCreationExpressionBase(BoundObjectCreationExpressionBase node)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitObjectCreationExpression(BoundObjectCreationExpression node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitConversion(BoundConversion node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(BoundNode node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitThrowStatement(BoundThrowStatement node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitList[T](ImmutableArray`1 list)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitBlock(BoundBlock node)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitBlock(BoundBlock node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalkerWithStackGuardWithoutRecursionOnTheLeftOfBinaryOperator.VisitIfStatement(BoundIfStatement node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitList[T](ImmutableArray`1 list)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitBlock(BoundBlock node)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitBlock(BoundBlock node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitTryStatement(BoundTryStatement node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitList[T](ImmutableArray`1 list)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitBlock(BoundBlock node)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.VisitBlock(BoundBlock node)
      at Microsoft.CodeAnalysis.CSharp.BoundTreeWalker.VisitNonConstructorMethodBody(BoundNonConstructorMethodBody node)
      at Microsoft.CodeAnalysis.CSharp.RefSafetyAnalysis.Analyze(CSharpCompilation compilation, MethodSymbol symbol, BoundNode node, BindingDiagnosticBag diagnostics)
      at Microsoft.CodeAnalysis.CSharp.MethodCompiler.BindMethodBody(MethodSymbol method, TypeCompilationState compilationState, BindingDiagnosticBag diagnostics, Boolean includeInitializersInBody, BoundNode initializersBody, Boolean reportNullableDiagnostics, ImportChain& importChain, Boolean& originalBodyNested, Boolean& prependedDefaultValueTypeConstructorInitializer, InitialState& forSemanticModel)
      at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState)
      at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType)
      at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0()
      at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   --- End of stack trace from previous location ---
      at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
      at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
   --- End of stack trace from previous location ---
      at Microsoft.CodeAnalysis.CSharp.MethodCompiler.WaitForWorkers()
      at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethodBodies(CSharpCompilation compilation, PEModuleBuilder moduleBeingBuiltOpt, Boolean emittingPdb, Boolean hasDeclarationErrors, Boolean emitMethodBodies, BindingDiagnosticBag diagnostics, Predicate`1 filterOpt, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.<GetDiagnosticsForMethodBodiesInTree>g__compileMethodBodiesAndDocComments|238_0(SyntaxTree filterTree, Nullable`1 filterSpan, BindingDiagnosticBag bindingDiagnostics, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsForMethodBodiesInTree(SyntaxTree tree, Nullable`1 span, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsForSyntaxTree(CompilationStage stage, SyntaxTree syntaxTree, Nullable`1 filterSpanWithinTree, Boolean includeEarlierStages, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.CSharp.SyntaxTreeSemanticModel.GetDiagnostics(Nullable`1 span, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.<GetCompilationEventsForSingleFileAnalysis>g__generateCompilationEvents|64_0(Compilation compilation, AnalysisScope analysisScope, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.GetCompilationEventsForSingleFileAnalysis(Compilation compilation, AnalysisScope analysisScope, ImmutableArray`1 additionalFiles, Boolean hasAnyActionsRequiringCompilationEvents, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.ComputeAnalyzerDiagnosticsAsync(AnalysisScope analysisScope, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.GetAnalysisResultCoreAsync(SemanticModel model, Nullable`1 filterSpan, ImmutableArray`1 analyzers, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzersPair.GetAnalysisResultAsync(SemanticModel model, Nullable`1 filterSpan, ImmutableArray`1 projectAnalyzers, ImmutableArray`1 hostAnalyzers, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.Extensions.GetAnalysisResultAsync(CompilationWithAnalyzersPair compilationWithAnalyzers, DocumentAnalysisScope documentAnalysisScope, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Diagnostics.Extensions.GetAnalysisResultAsync(CompilationWithAnalyzersPair compilationWithAnalyzers, DocumentAnalysisScope documentAnalysisScope, Project project, DiagnosticAnalyzerInfoCache analyzerInfoCache, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.AnalyzeAsync(CompilationWithAnalyzersPair compilationWithAnalyzers, BidirectionalMap`2 analyzerToIdMap, ImmutableArray`1 projectAnalyzers, ImmutableArray`1 hostAnalyzers, SkippedHostAnalyzersInfo skippedAnalyzersInfo, Boolean reportSuppressedDiagnostics, Boolean logPerformanceInfo, Boolean getTelemetryInfo, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.GetDiagnosticsAsync(ImmutableArray`1 projectAnalyzerIds, ImmutableArray`1 hostAnalyzerIds, Boolean reportSuppressedDiagnostics, Boolean logPerformanceInfo, Boolean getTelemetryInfo, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.GetNormalPriorityDiagnosticsAsync(ImmutableArray`1 projectAnalyzerIds, ImmutableArray`1 hostAnalyzerIds, Boolean reportSuppressedDiagnostics, Boolean logPerformanceInfo, Boolean getTelemetryInfo, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.RemoteDiagnosticAnalyzerService.<>c__DisplayClass3_0.<<CalculateDiagnosticsAsync>b__0>d.MoveNext()
   --- End of stack trace from previous location ---
      at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.<>c__DisplayClass7_0`1.<<RunWithSolutionAsync>g__ProcessSolutionAsync|1>d.MoveNext()
   --- End of stack trace from previous location ---
      at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.RunWithSolutionAsync[T](AssetProvider assetProvider, Checksum solutionChecksum, Boolean updatePrimaryBranch, Func`2 implementation, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.RunWithSolutionAsync[T](AssetProvider assetProvider, Checksum solutionChecksum, Boolean updatePrimaryBranch, Func`2 implementation, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.BrokeredServiceBase.RunWithSolutionAsync[T](Checksum solutionChecksum, Func`2 implementation, CancellationToken cancellationToken)
      at Microsoft.CodeAnalysis.Remote.RemoteDiagnosticAnalyzerService.CalculateDiagnosticsAsync(Checksum solutionChecksum, DiagnosticArguments arguments, CancellationToken cancellationToken)

Please let me know if you would need any more details, thanks!

[jaredpar]

Thanks for reporting. Believe this is a duplicate of this feedback issue and was fixed by #78015