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dotnet watch crashes

Open AndreiShenets opened this issue 10 months ago • 3 comments

Describe the bug

I use 'dotnet watch' for .NET 9 Blazor project in Server Side Rendering mode. Very often when I change html on razor pages or components, it crashes with 'Index was outside the bounds of the array' exception. It happens not often but mostly when I do significant changes in my markup, move or add blocks of the code.

To Reproduce

There is no stable steps to reproduce. The attached below project is a very cut version of my project where I usually get the errors.

Steps:

  • Go to DocumentReview.razor file.
  • Select any duplicatable markup block, for example <TemplatedClumn> from line 161 to line 209, or from line 258 to line 282
  • Start to duplicate the code block and press ctrl+s
  • Wait for a short amount of time, usually from 1 to 2 seconds
  • Repeat duplication and saving
  • Ctrl+Z + Ctrl+S
  • Repeat several times
  • Usually one of the three error below happens

BlazorApp1.zip

Exceptions (if any)

Exception 1:

dotnet watch ❌ [Gea.Idp (net9.0)] Exited with error code -1
dotnet watch ❌ System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.EmitParametersFromOriginalMetadata(IMethodDefinition methodDef, MethodDefinitionHandle handle)
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.CreateIndicesForMethod(IMethodDefinition methodDef, SymbolChange methodChange)
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.CreateIndicesForNonTypeMembers(ITypeDefinition typeDef)
   at Microsoft.Cci.MetadataWriter.<CreateIndicesForModule>g__createIndices|102_0(ITypeDefinition typeDef, Queue`1 typesToIndex)
   at Microsoft.Cci.MetadataWriter.CreateIndicesForModule()
   at Microsoft.Cci.MetadataWriter.CreateIndices()
   at Microsoft.Cci.MetadataWriter.BuildMetadataAndIL(PdbWriter nativePdbWriterOpt, BlobBuilder ilBuilder, PooledBlobBuilder& mappedFieldDataBuilder, PooledBlobBuilder& managedResourceDataBuilder, Blob& mvidFixup, Blob& mvidStringFixup)
   at Microsoft.Cci.MetadataWriter.WriteMetadataAndIL(PdbWriter nativePdbWriterOpt, Stream metadataStream, Stream ilStream, Stream portablePdbStreamOpt, MetadataSizes& metadataSizes)
   at Microsoft.CodeAnalysis.Compilation.SerializeToDeltaStreams(CommonPEModuleBuilder moduleBeingBuilt, DefinitionMap definitionMap, SymbolChanges changes, Stream metadataStream, Stream ilStream, Stream pdbStream, ArrayBuilder`1 updatedMethods, ArrayBuilder`1 changedTypes, DiagnosticBag diagnostics, Func`2 testSymWriterFactory, String pdbFilePath, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Emit.EmitHelpers.EmitDifference(CSharpCompilation compilation, EmitBaseline baseline, IEnumerable`1 edits, Func`2 isAddedSymbol, Stream metadataStream, Stream ilStream, Stream pdbStream, CompilationTestData testData, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Compilation.EmitDifference(EmitBaseline baseline, IEnumerable`1 edits, Func`2 isAddedSymbol, Stream metadataStream, Stream ilStream, Stream pdbStream, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.EditAndContinue.EditSession.EmitSolutionUpdateAsync(Solution solution, ActiveStatementSpanProvider solutionActiveStatementSpanProvider, UpdateId updateId, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.EditAndContinue.DebuggingSession.EmitSolutionUpdateAsync(Solution solution, IImmutableSet`1 runningProjects, ActiveStatementSpanProvider activeStatementSpanProvider, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.ExternalAccess.Watch.Api.WatchHotReloadService.GetUpdatesAsync(Solution solution, IImmutableSet`1 runningProjects, CancellationToken cancellationToken)
   at Microsoft.DotNet.Watch.CompilationHandler.HandleManagedCodeChangesAsync(Func`3 restartPrompt, CancellationToken cancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.Program.RunAsync()
dotnet watch ❌ An unexpected error occurred

Exception2:

System.ArgumentException: An item with the same key has already been added. Key: 4170
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.GetDelta(Compilation compilation, Guid encId, MetadataSizes metadataSizes)
   at Microsoft.CodeAnalysis.Compilation.SerializeToDeltaStreams(CommonPEModuleBuilder moduleBeingBuilt, DefinitionMap definitionMap, SymbolChanges changes, Stream metadataStream, Stream ilStream, Stream pdbStream, ArrayBuilder`1 updatedMethods, ArrayBuilder`1 changedTypes, DiagnosticBag diagnostics, Func`2 testSymWriterFactory, String pdbFilePath, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Emit.EmitHelpers.EmitDifference(CSharpCompilation compilation, EmitBaseline baseline, IEnumerable`1 edits, Func`2 isAddedSymbol, Stream metadataStream, Stream ilStream, Stream pdbStream, CompilationTestData testData, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Compilation.EmitDifference(EmitBaseline baseline, IEnumerable`1 edits, Func`2 isAddedSymbol, Stream metadataStream, Stream ilStream, Stream pdbStream, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.EditAndContinue.EditSession.EmitSolutionUpdateAsync(Solution solution, ActiveStatementSpanProvider solutionActiveStatementSpanProvider, UpdateId updateId, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.EditAndContinue.DebuggingSession.EmitSolutionUpdateAsync(Solution solution, IImmutableSet`1 runningProjects, ActiveStatementSpanProvider activeStatementSpanProvider, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.ExternalAccess.Watch.Api.WatchHotReloadService.GetUpdatesAsync(Solution solution, IImmutableSet`1 runningProjects, CancellationToken cancellationToken)
   at Microsoft.DotNet.Watch.CompilationHandler.HandleManagedCodeChangesAsync(Func`3 restartPrompt, CancellationToken cancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.Program.RunAsync()

Further technical details

.NET SDK: Version: 9.0.301 Commit: a596cd22e2 Workload version: 9.0.300-manifests.07067f5b MSBuild version: 17.14.5+edd3bbf37

Runtime Environment: OS Name: Windows OS Version: 10.0.26100 OS Platform: Windows RID: win-x64 Base Path: C:\Program Files\dotnet\sdk\9.0.301\

.NET workloads installed: [aspire] Installation Source: VS 17.14.36203.30 Manifest Version: 8.2.2/8.0.100 Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.aspire\8.2.2\WorkloadManifest.json Install Type: Msi

Configured to use loose manifests when installing new manifests.

Host: Version: 10.0.0-preview.5.25277.114 Architecture: x64 Commit: ddf39a1b46

.NET SDKs installed: 6.0.428 [C:\Program Files\dotnet\sdk] 8.0.411 [C:\Program Files\dotnet\sdk] 9.0.301 [C:\Program Files\dotnet\sdk] 10.0.100-preview.5.25277.114 [C:\Program Files\dotnet\sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 8.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 9.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 10.0.0-preview.5.25277.114 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 8.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 9.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 10.0.0-preview.5.25277.114 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 8.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 9.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 10.0.0-preview.5.25277.114 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found: x86 [C:\Program Files (x86)\dotnet] registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables: Not set

global.json file: P:\global.json

AndreiShenets avatar Jun 17 '25 11:06 AndreiShenets

Thanks for report. Could you please provide repro steps?

Alternatively, please set Microsoft_CodeAnalysis_EditAndContinue_LogDir env variable to a directory path, run dotnet-watch --verbose and share the content of the directory and the console output.

tmat avatar Jun 21 '25 19:06 tmat

One more exception

dotnet watch ❌ [BlazorApp1 (net9.0)] Exited with error code -1
dotnet watch ❌ System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.CodeAnalysis.Emit.DefinitionMap.GetPreviousMethodHandle(IMethodSymbolInternal oldMethod, IMethodSymbolInternal& peMethod)
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.<CreateDeletedMethodsDefs>g__getDeletedMethodDefs|83_1(ITypeDefinition typeDef, <>c__DisplayClass83_0&)
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.<CreateDeletedMethodsDefs>g__recurse|83_0(ITypeDefinition typeDef, <>c__DisplayClass83_0&)
   at Microsoft.CodeAnalysis.Emit.DeltaMetadataWriter.CreateDeletedMethodsDefs(EmitContext context, SymbolChanges changes)
   at Microsoft.CodeAnalysis.Compilation.SerializeToDeltaStreams(CommonPEModuleBuilder moduleBeingBuilt, DefinitionMap definitionMap, SymbolChanges changes, Stream metadataStream, Stream ilStream, Stream pdbStream, ArrayBuilder`1 updatedMethods, ArrayBuilder`1 changedTypes, DiagnosticBag diagnostics, Func`2 testSymWriterFactory, String pdbFilePath, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Emit.EmitHelpers.EmitDifference(CSharpCompilation compilation, EmitBaseline baseline, IEnumerable`1 edits, Func`2 isAddedSymbol, Stream metadataStream, Stream ilStream, Stream pdbStream, CompilationTestData testData, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Compilation.EmitDifference(EmitBaseline baseline, IEnumerable`1 edits, Func`2 isAddedSymbol, Stream metadataStream, Stream ilStream, Stream pdbStream, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.EditAndContinue.EditSession.EmitSolutionUpdateAsync(Solution solution, ActiveStatementSpanProvider solutionActiveStatementSpanProvider, UpdateId updateId, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.EditAndContinue.DebuggingSession.EmitSolutionUpdateAsync(Solution solution, IImmutableSet`1 runningProjects, ActiveStatementSpanProvider activeStatementSpanProvider, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.ExternalAccess.Watch.Api.WatchHotReloadService.GetUpdatesAsync(Solution solution, IImmutableSet`1 runningProjects, CancellationToken cancellationToken)
   at Microsoft.DotNet.Watch.CompilationHandler.HandleManagedCodeChangesAsync(Func`3 restartPrompt, CancellationToken cancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.HotReloadDotNetWatcher.WatchAsync(CancellationToken shutdownCancellationToken)
   at Microsoft.DotNet.Watch.Program.RunAsync()
dotnet watch ❌ An unexpected error occurred

AndreiShenets avatar Jun 22 '25 17:06 AndreiShenets

@tmat I updated the initial description with steps I was able to use to reproduce the Object reference not set to an instance of an object and An item with the same key has already been added. Key: XXXX exceptions. Please pay attention that the way of reproduction is completely unstable and it might work.

AndreiShenets avatar Jun 22 '25 17:06 AndreiShenets

@AndreiShenets Thanks for the detailed steps. I was able to get it working and try duplicating the code segments as you described.

Have you tried on the latest Preview of .NET 10? It seems to be working

tmat avatar Jun 25 '25 17:06 tmat

@tmat if you mean switching the whole project to .net 10 then no I haven't. It is not so easy to move the whole project to .net 10 yet.

But I allowed preview versions of .net tool chain with global.json file. dotnet watch --verbose in this case says that it uses .net 10 preview for running the command if I understand the log correctly.

I was able to get An item with the same key has already been added. Key: XXXX exception.

AndreiShenets avatar Jun 26 '25 06:06 AndreiShenets