Omnisharp stops a few minutes after loading project

Issue Description

Project works fine for a few minutes, then all omnisharp features stop working (intellisense and go-to reference, etc…).

Logs

OmniSharp log

[ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index
  at Microsoft.CodeAnalysis.Text.SourceText+LineInfo.get_Item (System.Int32 index) [0x0000f] in <ae0917f99a2140a190480a55c4fbf9ad>:0 
  at OmniSharp.Helpers.LocationExtensions.GetQuickFix (Microsoft.CodeAnalysis.Location location, OmniSharp.OmniSharpWorkspace workspace) [0x0007a] in <9a68c6cb5d34406fb639c5d426ef0d9e>:0 
  at OmniSharp.Roslyn.CSharp.Services.Navigation.FindUsagesService+<>c__DisplayClass2_0.<Handle>b__2 (Microsoft.CodeAnalysis.Location l) [0x00000] in <9a68c6cb5d34406fb639c5d426ef0d9e>:0 
  at System.Linq.Enumerable+SelectEnumerableIterator`2[TSource,TResult].MoveNext () [0x00048] in <6f6cfe3dc7984568b6f7767c7378b138>:0 
  at System.Linq.Set`1[TElement].UnionWith (System.Collections.Generic.IEnumerable`1[T] other) [0x00018] in <6f6cfe3dc7984568b6f7767c7378b138>:0 
  at System.Linq.Enumerable+DistinctIterator`1[TSource].FillSet () [0x0000b] in <6f6cfe3dc7984568b6f7767c7378b138>:0 
  at System.Linq.Enumerable+DistinctIterator`1[TSource].ToArray () [0x00000] in <6f6cfe3dc7984568b6f7767c7378b138>:0 
  at System.Linq.Buffer`1[TElement]..ctor (System.Collections.Generic.IEnumerable`1[T] source) [0x0000a] in <6f6cfe3dc7984568b6f7767c7378b138>:0 
  at System.Linq.OrderedEnumerable`1+<GetEnumerator>d__3[TElement].MoveNext () [0x0001e] in <6f6cfe3dc7984568b6f7767c7378b138>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList (Newtonsoft.Json.JsonWriter writer, System.Collections.IEnumerable values, Newtonsoft.Json.Serialization.JsonArrayContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000e1] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContract valueContract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000d4] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x0008d] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContract valueContract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000b0] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x0008d] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContract valueContract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x000b0] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00079] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.JsonSerializer.SerializeInternal (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00253] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.JsonSerializer.Serialize (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00000] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObjectInternal (System.Object value, System.Type type, Newtonsoft.Json.JsonSerializer jsonSerializer) [0x00028] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObject (System.Object value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x00007] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObject (System.Object value) [0x00000] in <07e3893119a945b29a35e81930b1c8ad>:0 
  at OmniSharp.Protocol.Packet.ToString () [0x00000] in <1ed0cdfb5a5d42889b4f5df087ff7bd6>:0 
  at System.IO.TextWriter.WriteLine (System.Object value) [0x00028] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.IO.TextWriter+SyncTextWriter.WriteLine (System.Object value) [0x00000] in <285579f54af44a2ca048dad6be20e190>:0 
  at (wrapper synchronized) System.IO.TextWriter+SyncTextWriter.WriteLine(object)
  at OmniSharp.Services.SharedTextWriter.ProcessWriteQueue () [0x0001d] in <1ed0cdfb5a5d42889b4f5df087ff7bd6>:0 
  at System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) [0x00014] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00071] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) [0x0002b] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ThreadHelper.ThreadStart () [0x00008] in <285579f54af44a2ca048dad6be20e190>:0 

Environment information

VSCode version: 1.41.1 C# Extension: 1.21.9

Mono Information

OmniSharp using global mono :6.4.0

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.0.101 Commit: bc5f8df0f5

Runtime Environment: OS Name: linuxmint OS Version: 19 OS Platform: Linux RID: linuxmint.19-x64 Base Path: /usr/share/dotnet/sdk/3.0.101/

Host (useful for support): Version: 3.0.1 Commit: 19942e7199

.NET Core SDKs installed: 2.1.802 [/usr/share/dotnet/sdk] 2.2.402 [/usr/share/dotnet/sdk] 3.0.101 [/usr/share/dotnet/sdk]

.NET Core runtimes installed: Microsoft.AspNetCore.All 2.1.14 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.All 2.2.8 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 2.1.14 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 2.2.8 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.0.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.1.14 [/usr/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 2.2.8 [/usr/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 3.0.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
Angular-BeastCode	Mikael	8.1.2
angular-console	nrwl	10.0.0
angular-essentials	johnpapa	0.6.3
Angular2	johnpapa	8.3.0
angular2-inline	natewallace	0.0.17
auto-using	Fudge	0.7.9
azure-bot	Zim	0.0.4
csharp	ms-vscode	1.21.9
cshtml	fireside21	0.1.3
debugger-for-chrome	msjsdiag	4.12.3
EditorConfig	EditorConfig	0.14.4
gitlens	eamodio	10.2.0
material-icon-theme	PKief	3.9.2
mssql	ms-mssql	1.8.0
ng-template	Angular	0.900.3
prettier-standard-vscode	numso	0.6.0
prettier-vscode	esbenp	3.18.0
python	ms-python	2019.11.50794
r	Ikuyadeu	1.2.0
sqltools	mtxr	0.21.5
team	ms-vsts	1.161.0
tsimporter	pmneo	2.0.1
vsc-prolog	arthurwang	0.8.23
vscode-color	anseki	0.4.5
vscode-eslint	dbaeumer	2.0.11
vscode-icons	vscode-icons-team	9.6.0
vscode-mysql	formulahendry	0.4.0
vscode-npm-script	eg2	0.3.10
vscode-nuget-package-manager	jmrog	1.1.6
vscode-peacock	johnpapa	3.2.0
vscode-sqlite	alexcvzz	0.8.1
vscode-typescript-tslint-plugin	ms-vscode	1.2.3
winteriscoming	johnpapa	1.3.0
xml	DotJoshJohnson	2.5.0

[filipw]

Thank, this is a good repro.

I had a quick look and the problem here is that here we fall out of bounds with the current implementation.

In this case the state is as follow:

• location is SourceLocation(c:\code\repro-omnisharp-crash\Pages\Test.cshtml__bg__virtual.cs@116:40)"Stats"
• mapped line span points to {c:\code\repro-omnisharp-crash\Pages\Test.cshtml: (143,39)-(143,44)}

So what we do wrong is that we try to fetch line with index 143 (as defined in Test.cshtml) out of Test.cshtml__bg__virtual.cs which only has 138 lines in this case. So we try to pick text from the wrong document. We should pick the path from mapped line span, locate that document in the workspace and use that to pick the text.

What’s funny is that it mostly works because the lines are correct and the filepath returned too, just the text doesn’t add up; however VS Code doesn’t use the text - only lines and filepath. So this crashes only when the real CSHTML is longer than the generated file.

[utillity]

OmniSharp keeps crashing for me, too. After this error, IntelliSense etc. no longer works:

[warn]: OmniSharp.Stdio.Host
        ************ Request ************
{
  "Type": "request",
  "Seq": 2459,
  "Command": "/findusages",
  "Arguments": {
    "FileName": "c:\\DEV\\...\\Models\\Mapper.cs",
    "Line": 82,
    "Column": 47,
    "OnlyThisFile": true,
    "ExcludeDefinition": false
  }
}
[fail]: OmniSharp.Stdio.Host
        ************  Response ************ 
{
  "Request_seq": 2459,
  "Command": "/findusages",
  "Running": true,
  "Success": false,
  "Message": "\"System.InvalidOperationException: Unexpected null\\r\\n   at Roslyn.Utilities.Contract.Fail(String message)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.MapToAppropriateSymbol(ISymbol symbol)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<DetermineAllSymbolsCoreAsync>d__20.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<DetermineAllSymbolsAsync>d__19.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<FindReferencesAsync>d__8.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<FindReferencesAsync>d__8.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.FindReferencesSearchEngine.<FindReferencesAsync>d__8.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.SymbolFinder.<FindReferencesAsync>d__34.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.SymbolFinder.<FindReferencesAsync>d__40.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at Microsoft.CodeAnalysis.FindSymbols.SymbolFinder.<FindReferencesAsync>d__39.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at OmniSharp.Roslyn.CSharp.Services.Navigation.FindUsagesService.<Handle>d__2.MoveNext() in D:\\\\a\\\\1\\\\s\\\\src\\\\OmniSharp.Roslyn.CSharp\\\\Services\\\\Navigation\\\\FindUsagesService.cs:line 41\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at OmniSharp.Endpoint.EndpointHandler`2.<AggregateResponsesFromLanguageHandlers>d__18.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at OmniSharp.Endpoint.EndpointHandler`2.<HandleRequestForLanguage>d__20.MoveNext() in D:\\\\a\\\\1\\\\s\\\\src\\\\OmniSharp.Host\\\\Endpoint\\\\EndpointHandler.cs:line 227\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at OmniSharp.Endpoint.EndpointHandler`2.<Process>d__16.MoveNext() in D:\\\\a\\\\1\\\\s\\\\src\\\\OmniSharp.Host\\\\Endpoint\\\\EndpointHandler.cs:line 131\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n   at OmniSharp.Stdio.Host.<HandleRequest>d__13.MoveNext() in D:\\\\a\\\\1\\\\s\\\\src\\\\OmniSharp.Stdio\\\\Host.cs:line 215\"",
  "Body": null,
  "Seq": 46,
  "Type": "response"
}

The line in question is not anything complex:

OmniSharp: c:\Users.….vscode\extensions\ms-dotnettools.csharp-1.23.8.omnisharp\1.37.6-beta.30\OmniSharp.exe