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Visual Studio crashed with NullReference incomplete foreach #27520

Closed
#27605
Closed
Visual Studio crashed with NullReference incomplete foreach#27520
#27605
Assignees
jcouv
Labels
Area-CompilersResolution-FixedThe bug has been fixed and/or the requested behavior has been implemented
Milestone
15.8
@davkean

Description

@davkean
davkean
opened on Jun 6, 2018

Version Used:

Steps to Reproduce:

  1. Try put a space in $
using System;
using System.Text;

namespace ConsoleApp61
{
    class Program
    {
        static void Main(string[] args)
        {
            string code = "89 414 9'20 135 1911818";

            StringBuilder b = new StringBuilder();

            foreach (char $ in code)
            {
                
            }
        }
    }
}
Application: devenv.exe
Framework Version: v4.0.30319
Description: The application requested process termination through System.Environment.FailFast(string message).
Message: System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.CodeAnalysis.CSharp.MemberSemanticModel.GetDeconstructionInfo(ForEachVariableStatementSyntax node)
   at Microsoft.CodeAnalysis.CSharp.CSharpExtensions.GetDeconstructionInfo(SemanticModel semanticModel, ForEachVariableStatementSyntax foreach)
   at Microsoft.CodeAnalysis.CSharp.CSharpSemanticFactsService.GetDeconstructionForEachMethods(SemanticModel semanticModel, SyntaxNode node)
   at Microsoft.CodeAnalysis.CSharp.CSharpSemanticFactsService.GetBestOrAllSymbols(SemanticModel semanticModel, SyntaxNode node, SyntaxToken token, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Shared.Extensions.SemanticModelExtensions.GetSemanticInfo(SemanticModel semanticModel, ISemanticFactsService semanticFacts, ISyntaxFactsService syntaxFacts, SyntaxToken token, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Shared.Extensions.SemanticModelExtensions.GetSemanticInfo(SemanticModel semanticModel, SyntaxToken token, Workspace workspace, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.FindSymbols.SymbolFinder.<GetSemanticInfoAtPositionAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.FindSymbols.SymbolFinder.<FindSymbolAtPositionAsync>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.DocumentHighlighting.AbstractDocumentHighlightsService.<GetDocumentHighlightsInCurrentProcessAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.DocumentHighlighting.AbstractDocumentHighlightsService.<GetDocumentHighlightsAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Editor.ReferenceHighlighting.ReferenceHighlightingViewTaggerProvider.<ProduceTagsAsync>d__12.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Editor.Tagging.AbstractAsynchronousTaggerProvider`1.TagSource.<RecomputeTagsAsync>d__73.MoveNext()
Stack:
   at System.Environment.FailFast(System.String, System.Exception)
   at Microsoft.CodeAnalysis.FailFast.OnFatalException(System.Exception)
   at Microsoft.CodeAnalysis.ErrorReporting.FatalError.Report(System.Exception, System.Action`1<System.Exception>)
   at Microsoft.CodeAnalysis.ErrorReporting.FatalError.Report(System.Exception)
   at Roslyn.Utilities.TaskExtensions.ReportFatalErrorWorker(System.Threading.Tasks.Task, System.Object)
   at System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
   at System.Threading.Tasks.Task.ExecutionContextCallback(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef)
   at System.Threading.Tasks.Task.ExecuteEntry(Boolean)
   at System.Threading.Tasks.ThreadPoolTaskScheduler.TryExecuteTaskInline(System.Threading.Tasks.Task, Boolean)
   at System.Threading.Tasks.TaskScheduler.TryRunInline(System.Threading.Tasks.Task, Boolean)
   at System.Threading.Tasks.TaskContinuation.InlineIfPossibleOrElseQueue(System.Threading.Tasks.Task, Boolean)
   at System.Threading.Tasks.StandardTaskContinuation.Run(System.Threading.Tasks.Task, Boolean)
   at System.Threading.Tasks.Task.FinishContinuations()
   at System.Threading.Tasks.Task.FinishStageThree()
   at System.Threading.Tasks.Task.FinishStageTwo()
   at System.Threading.Tasks.Task.Finish(Boolean)
   at System.Threading.Tasks.Task`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].TrySetException(System.Object)
   at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].TrySetFromTask(System.Threading.Tasks.Task, Boolean)
   at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].ProcessInnerTask(System.Threading.Tasks.Task)
   at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].ProcessCompletedOuterTask(System.Threading.Tasks.Task)
   at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].InvokeCore(System.Threading.Tasks.Task)
   at System.Threading.Tasks.UnwrapPromise`1[[System.Threading.Tasks.TaskExtensions+VoidResult, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].Invoke(System.Threading.Tasks.Task)
   at System.Threading.Tasks.Task.FinishContinuations()
   at System.Threading.Tasks.Task.FinishStageThree()
   at System.Threading.Tasks.Task.FinishStageTwo()
   at System.Threading.Tasks.Task.Finish(Boolean)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef)
   at System.Threading.Tasks.Task.ExecuteEntry(Boolean)
   at System.Threading.Tasks.Task.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Expected Behavior:

Actual Behavior:

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