C# Language Server crashes

[sandr0-p]

Type: Performance Issue

Issue Description

Language Server crashes when opening C# document, or when editing it.
Last working extension version ms-dotnettools.csharp@2.87.31 with ms-dotnettools.csdevkit@1.41.11.

Steps to Reproduce

Install ms-dotnettools.csharp@2.90.60 and ms-dotnettools.csdevkit@1.50.51.
Open C# document and edit it, Language Server crashes either directly on open or after 5 to 10 minutes.

Probably related to #8674

Expected Behavior

VS Code is showing code highlighting, references and autocompletion.

Actual Behavior

VS Code stops showing code highlighting, references and autocompletion.

Extension version: 2.90.60
VS Code version: Code - Insiders 1.105.0-insider (72f7c60cfcc01d4e8a437f4a1704b8bbd3229411, 2025-10-03T20:13:56.017Z)
OS version: Darwin arm64 24.6.0
Modes:
Remote OS version: Linux arm64 6.10.14-linuxkit

Logs

C# log

2025-10-04 22:05:52.065 [info] Locating .NET runtime version 9.0.1
2025-10-04 22:05:53.693 [info] Dotnet path: /root/dotnet/dotnet
2025-10-04 22:05:53.693 [info] Activating C# + C# Dev Kit...
2025-10-04 22:05:53.959 [info] [stdout] info: Program[0]
      Server started with process ID 67063

2025-10-04 22:05:54.153 [info] [stdout] {"pipeName":"/tmp/9751dc30.sock"}

2025-10-04 22:05:54.153 [info] received named pipe information from server
2025-10-04 22:05:54.153 [info] client has connected to server
2025-10-04 22:05:54.224 [info] [Program] Language server initialized
2025-10-04 22:05:56.136 [info] [textDocument/_vs_getProjectContexts] [Microsoft.CodeAnalysis.LanguageServer.DotnetCliHelper] Using dotnet executable configured on the PATH
2025-10-04 22:05:56.266 [info] [textDocument/_vs_getProjectContexts] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsProjectSystem] Failed to obtain virtual project for '/development/src/flx.Hakana.Core/Team/TeamController.cs' using dotnet run-api. Falling back to directly creating the virtual project.
2025-10-04 22:05:56.330 [info] Connection to server got closed. Server will restart.
2025-10-04 22:05:56.331 [info] Dotnet path: /root/dotnet/dotnet
2025-10-04 22:05:56.331 [info] Activating C# + C# Dev Kit...
2025-10-04 22:05:56.332 [info] Language server process exited with null
2025-10-04 22:05:56.402 [info] [stdout] info: Program[0]
      Server started with process ID 67334

2025-10-04 22:05:56.410 [info] [stdout] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll with assembly name Microsoft.VisualStudioCode.RazorExtension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll with assembly name Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot

2025-10-04 22:05:56.609 [info] [stdout] {"pipeName":"/tmp/0e656b08.sock"}

2025-10-04 22:05:56.609 [info] received named pipe information from server
2025-10-04 22:05:56.609 [info] client has connected to server
2025-10-04 22:05:56.660 [info] [Program] Language server initialized
2025-10-04 22:05:56.960 [info] Connection to server got closed. Server will restart.
2025-10-04 22:05:56.961 [info] Dotnet path: /root/dotnet/dotnet
2025-10-04 22:05:56.961 [info] Activating C# + C# Dev Kit...
2025-10-04 22:05:56.961 [info] Language server process exited with null
2025-10-04 22:05:57.079 [info] [stdout] info: Program[0]
      Server started with process ID 67383
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll with assembly name Microsoft.VisualStudioCode.RazorExtension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll with assembly name Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll with assembly name Microsoft.VisualStudioCode.RazorExtension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll with assembly name Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot

2025-10-04 22:05:57.269 [info] [stdout] {"pipeName":"/tmp/a51aafe4.sock"}

2025-10-04 22:05:57.270 [info] received named pipe information from server
2025-10-04 22:05:57.270 [info] client has connected to server
2025-10-04 22:05:57.324 [info] [Program] Language server initialized
2025-10-04 22:05:57.754 [info] [serviceBroker/connect] [WorkspaceProjectFactoryService] Project /development/src/flx.Hakana.Core/flx.Hakana.Core.csproj loaded by C# Dev Kit
2025-10-04 22:05:57.803 [info] [textDocument/documentSymbol] [Microsoft.CodeAnalysis.LanguageServer.DotnetCliHelper] Using dotnet executable configured on the PATH
2025-10-04 22:05:57.905 [info] [textDocument/documentSymbol] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsProjectSystem] Failed to obtain virtual project for '/development/src/flx.Hakana.Core/Team/TeamController.cs' using dotnet run-api. Falling back to directly creating the virtual project.
2025-10-04 22:05:57.968 [info] Connection to server got closed. Server will restart.
2025-10-04 22:05:57.969 [info] Dotnet path: /root/dotnet/dotnet
2025-10-04 22:05:57.969 [info] Activating C# + C# Dev Kit...
2025-10-04 22:05:57.972 [info] Language server process exited with null
2025-10-04 22:05:58.031 [info] [stdout] info: Program[0]
      Server started with process ID 67471

2025-10-04 22:05:58.037 [info] [stdout] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll with assembly name Microsoft.VisualStudioCode.RazorExtension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools

2025-10-04 22:05:58.038 [info] [stdout] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll with assembly name Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll with assembly name Microsoft.VisualStudioCode.RazorExtension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll with assembly name Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll with assembly name Microsoft.VisualStudioCode.RazorExtension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools

2025-10-04 22:05:58.038 [info] [stdout] fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll with assembly name Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools
fail: Microsoft.CodeAnalysis.Remote.ExportProviderBuilder[0]
      /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll with assembly name Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer, Version=18.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a conflicts with extension loaded from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot

2025-10-04 22:05:58.225 [info] [stdout] {"pipeName":"/tmp/8a33ae76.sock"}

2025-10-04 22:05:58.225 [info] received named pipe information from server
2025-10-04 22:05:58.225 [info] client has connected to server
2025-10-04 22:05:58.269 [info] [Program] Language server initialized
2025-10-04 22:05:58.704 [info] [textDocument/documentSymbol] [Microsoft.CodeAnalysis.LanguageServer.DotnetCliHelper] Using dotnet executable configured on the PATH
2025-10-04 22:05:58.813 [info] [textDocument/documentSymbol] [Microsoft.CodeAnalysis.LanguageServer.FileBasedPrograms.FileBasedProgramsProjectSystem] Failed to obtain virtual project for '/development/src/flx.Hakana.Core/Team/TeamController.cs' using dotnet run-api. Falling back to directly creating the virtual project.
2025-10-04 22:05:58.904 [info] [textDocument/documentSymbol] [Microsoft.CodeAnalysis.MSBuild.BuildHostProcessManager] .NET BuildHost started from /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslyn/Microsoft.CodeAnalysis.LanguageServer reloading to start from /root/dotnet/dotnet to match necessary SDK location.
2025-10-04 22:05:59.367 [warning] [textDocument/documentSymbol] [LanguageServerProjectLoader] Project /development/src/flx.Hakana.Core/Team/TeamController.csproj has unresolved dependencies
2025-10-04 22:05:59.379 [info] [textDocument/documentSymbol] [LanguageServerProjectLoader] Successfully completed load of /development/src/flx.Hakana.Core/Team/TeamController.cs
2025-10-04 22:05:59.500 [error] [workspace/_roslyn_restore] [Microsoft.CodeAnalysis.LanguageServer.Handler.RestoreHandler] Restore completed with errors.
2025-10-04 22:05:59.502 [info] [textDocument/documentSymbol] [LanguageServerProjectLoader] Completed (re)load of all projects in 00:00:00.8054484

C# LSP Trace Logs log

Environment Information

VSCode version: 1.105.0-insider
C# Extension: 2.90.60
Using OmniSharp: false

Dotnet Information

.NET SDK: Version: 9.0.305 Commit: 3fc74f3529 Workload version: 9.0.300-manifests.ddedba1d MSBuild version: 17.14.21+8929ca9e3

Runtime Environment:
OS Name: ubuntu
OS Version: 24.04
OS Platform: Linux
RID: linux-arm64
Base Path: /root/dotnet/sdk/9.0.305/

.NET workloads installed:
There are no installed workloads to display.
Configured to use loose manifests when installing new manifests.

Host:
Version: 9.0.9
Architecture: arm64
Commit: 893c2ebbd4

.NET SDKs installed:
9.0.305 [/root/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 9.0.9 [/root/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 9.0.9 [/root/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
copilot	GitHub	1.376.1794	github.copilot-1.376.1794
copilot-chat	GitHub	0.32.2025100302	github.copilot-chat-0.32.2025100302
csdevkit	ms-dotnettools	1.50.51	ms-dotnettools.csdevkit-1.50.51-linux-arm64
csharp	ms-dotnettools	2.90.60	ms-dotnettools.csharp-2.90.60-linux-arm64
html-css-class-completion	Zignd	1.20.0	zignd.html-css-class-completion-1.20.0
ng-template	Angular	20.2.2	angular.ng-template-20.2.2
prettier-vscode	esbenp	11.0.0	esbenp.prettier-vscode-11.0.0
vscode-counter	uctakeoff	3.7.2	uctakeoff.vscode-counter-3.7.2
vscode-coverage-gutters	ryanluker	2.14.0	ryanluker.vscode-coverage-gutters-2.14.0
vscode-dotnet-runtime	ms-dotnettools	2.3.7	ms-dotnettools.vscode-dotnet-runtime-2.3.7
vscode-pull-request-github	GitHub	0.118.2	github.vscode-pull-request-github-0.118.2

C# Settings

Setting	Value
preferCSharpExtension	false
compilerDiagnosticScope	openFiles
analyzerDiagnosticScope	openFiles
enableXamlTools	true
useServerGC	true

System Info

Item	Value
CPUs	Apple M4 Pro (12 x 2400)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: enabled_on trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	5, 3, 3
Memory (System)	24.00GB (0.07GB free)
Process Argv	--crash-reporter-id c9dd98ea-f80e-4cbf-9482-c03e6e3833e8
Screen Reader	no
VM	0%

Item	Value
Remote	Dev Container: Hakana @ desktop-linux
OS	Linux arm64 6.10.14-linuxkit
CPUs	unknown (12 x 0)
Memory (System)	7.65GB (3.13GB free)
VM	0%

Process Info

CPU %	Mem MB	   PID	Process
   10	69665056736	 14782	code-insiders
    2	18999560928	 14788	   gpu-process
    0	12666373952	 14789	   utility-network-service
    5	113997365568	 14791	window [1] (TeamController.cs — development [Dev Container: Hakana @ desktop-linux])
    0	56998682784	 14827	shared-process
    0	     0	 16007	     /bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
    0	12666373952	 14871	pty-host
    0	18999560928	 15797	file-watcher [1]
    0	50665495808	 15798	extension-host [1]
    0	6333186976	 15854	     docker exec -i -u root 1d3a1f63f8c826aabae5050c421769eaa87912830b5fb1823c7e79a7dc489a22 /bin/sh -c echo "Container already running. Keep-alive process started." ; export VSCODE_REMOTE_CONTAINERS_SESSION=6381291b-3a03-45a3-8884-8b988f174d5e1759615549019 ; /bin/sh
    0	6333186976	 15939	     docker exec -i -u root -e VSCODE_REMOTE_CONTAINERS_SESSION=6381291b-3a03-45a3-8884-8b988f174d5e1759615549019 1d3a1f63f8c826aabae5050c421769eaa87912830b5fb1823c7e79a7dc489a22 /bin/sh
    0	18999560928	 15949	     /Applications/Visual Studio Code - Insiders.app/Contents/Frameworks/Code - Insiders Helper (Plugin).app/Contents/MacOS/Code - Insiders Helper (Plugin) /Users/sandro/.vscode-insiders/extensions/ms-vscode-remote.remote-containers-0.429.0/dist/shutdown/shutdownMonitorProcess /var/folders/4x/s9hjjdcn2s57d44yh37mcv840000gn/T/vscode-remote-containers-2dd1655d-7f25-42fd-a40e-f11fc897c942.sock dockerCompose Debug /Users/sandro/Library/Application Support/Code - Insiders/logs/20251004T225524/window1/exthost/ms-vscode-remote.remote-containers 1759615549412
    0	6333186976	 15973	     docker exec -i -u root 1d3a1f63f8c826aabae5050c421769eaa87912830b5fb1823c7e79a7dc489a22 /bin/sh
    0	6333186976	 15980	     docker exec -i -u root -e VSCODE_REMOTE_CONTAINERS_SESSION=6381291b-3a03-45a3-8884-8b988f174d5e1759615549019 1d3a1f63f8c826aabae5050c421769eaa87912830b5fb1823c7e79a7dc489a22 /root/.vscode-server-insiders/bin/72f7c60cfcc01d4e8a437f4a1704b8bbd3229411-insider/node -e \012\011\011\011\011const net = require('net');\012\011\011\011\011const fs = require('fs');\012\011\011\011\011process.stdin.pause();\012\011\011\011\011const client = net.createConnection({ host: '127.0.0.1', port: 45739 }, () => {\012\011\011\011\011\011console.error('Connection established');\012\011\011\011\011\011client.pipe(process.stdout);\012\011\011\011\011\011process.stdin.pipe(client);\012\011\011\011\011});\012\011\011\011\011client.on('close', function (hadError) {\012\011\011\011\011\011console.error(hadError ? 'Remote close with error' : 'Remote close');\012\011\011\011\011\011process.exit(hadError ? 1 : 0);\012\011\011\011\011});\012\011\011\011\011client.on('error', function (err) {\012\011\011\011\011\011process.stderr.write(err && (err.stack || err.message) || String(err));\012\011\011\011\011});\012\011\011\011\011process.stdin.on('close', function (hadError) {\012\011\011\011\011\011console.error(hadError ? 'Remote stdin close with error' : 'Remote stdin close');\012\011\011\011\011\011process.exit(hadError ? 1 : 0);\012\011\011\011\011});\012\011\011\011\011process.on('uncaughtException', function (err) {\012\011\011\011\011\011fs.writeSync(process.stderr.fd, `Uncaught Exception: ${String(err && (err.stack || err.message) || err)}\n`);\012\011\011\011\011});\012\011\011\011
    0	6333186976	 15994	     docker exec -i -u root -e VSCODE_REMOTE_CONTAINERS_SESSION=6381291b-3a03-45a3-8884-8b988f174d5e1759615549019 1d3a1f63f8c826aabae5050c421769eaa87912830b5fb1823c7e79a7dc489a22 /root/.vscode-server-insiders/bin/72f7c60cfcc01d4e8a437f4a1704b8bbd3229411-insider/node -e \012\011\011\011\011const net = require('net');\012\011\011\011\011const fs = require('fs');\012\011\011\011\011process.stdin.pause();\012\011\011\011\011const client = net.createConnection({ host: '127.0.0.1', port: 45739 }, () => {\012\011\011\011\011\011console.error('Connection established');\012\011\011\011\011\011client.pipe(process.stdout);\012\011\011\011\011\011process.stdin.pipe(client);\012\011\011\011\011});\012\011\011\011\011client.on('close', function (hadError) {\012\011\011\011\011\011console.error(hadError ? 'Remote close with error' : 'Remote close');\012\011\011\011\011\011process.exit(hadError ? 1 : 0);\012\011\011\011\011});\012\011\011\011\011client.on('error', function (err) {\012\011\011\011\011\011process.stderr.write(err && (err.stack || err.message) || String(err));\012\011\011\011\011});\012\011\011\011\011process.stdin.on('close', function (hadError) {\012\011\011\011\011\011console.error(hadError ? 'Remote stdin close with error' : 'Remote stdin close');\012\011\011\011\011\011process.exit(hadError ? 1 : 0);\012\011\011\011\011});\012\011\011\011\011process.on('uncaughtException', function (err) {\012\011\011\011\011\011fs.writeSync(process.stderr.fd, `Uncaught Exception: ${String(err && (err.stack || err.message) || err)}\n`);\012\011\011\011\011});\012\011\011\011

Remote: Dev Container: Hakana @ desktop-linux
CPU %	Mem MB	   PID	Process
    0	40391570306	 54079	remote-server
    0	18176206638	 54136	   ptyHost
    0	16156628122	 66889	   fileWatcher
    0	292838884717	 66908	   extension-host
    0	14137049607	 67005	     /vscode/vscode-server-insiders/bin/linux-arm64/72f7c60cfcc01d4e8a437f4a1704b8bbd3229411-insider/node /vscode/vscode-server-insiders/bin/linux-arm64/72f7c60cfcc01d4e8a437f4a1704b8bbd3229411-insider/extensions/json-language-features/server/dist/node/jsonServerMain --node-ipc --clientProcessId=66908
    0	38371991791	 67080	     electron-nodejs (config.js )
    0	28274099214	 67116	       /root/.vscode-server-insiders/extensions/ms-dotnettools.csdevkit-1.50.51-linux-arm64/components/vs-green-server/platforms/linux-arm64/node_modules/@microsoft/visualstudio-controller.linux-arm64/Microsoft.VisualStudio.Code.ServiceController 43502ca7ac /ControllerCooldownTimeout:30000 /TelemetrySession:{"TelemetryLevel":"all","IsOptedIn":false,"HostName":"Default","AppInsightsInstrumentationKey":null,"AsimovInstrumentationKey":null,"CollectorApiKey":"0c6ae279ed8443289764825290e4f9e2-1a736e7c-1324-4338-be46-fc2a58ae4d14-7255","AppId":1010,"UserId":"aba3357a-8994-4fe2-b42d-aa37a5852f8d","Id":"6381291b-3a03-45a3-8884-8b988f174d5e1759615549019","ProcessStartTime":134040891538876650,"SkuName":null,"VSExeVersion":null,"BucketFiltersToEnableWatsonForFaults":[],"BucketFiltersToAddDumpsToFaults":[]}
    0	34332834760	 67172	         /root/.vscode-server-insiders/extensions/ms-dotnettools.csdevkit-1.50.51-linux-arm64/components/vs-green-server/platforms/linux-arm64/node_modules/@microsoft/visualstudio-code-servicehost.linux-arm64/Microsoft.VisualStudio.Code.ServiceHost dotnet$C94B8CFE-E3FD-4BAF-A941-2866DBB566FE net.pipe://67116E74BA /TelemetrySession:{"TelemetryLevel":"all","IsOptedIn":false,"HostName":"Default","AppInsightsInstrumentationKey":null,"AsimovInstrumentationKey":null,"CollectorApiKey":"0c6ae279ed8443289764825290e4f9e2-1a736e7c-1324-4338-be46-fc2a58ae4d14-7255","AppId":1010,"UserId":"aba3357a-8994-4fe2-b42d-aa37a5852f8d","Id":"6381291b-3a03-45a3-8884-8b988f174d5e1759615549019","ProcessStartTime":134040891538876650,"SkuName":null,"VSExeVersion":null,"BucketFiltersToEnableWatsonForFaults":[],"BucketFiltersToAddDumpsToFaults":[]}
    0	58567776943	 67236	         /root/.vscode-server-insiders/extensions/ms-dotnettools.csdevkit-1.50.51-linux-arm64/components/vs-green-server/platforms/linux-arm64/node_modules/@microsoft/visualstudio-code-servicehost.linux-arm64/Microsoft.VisualStudio.Code.ServiceHost dotnet.projectSystem$C94B8CFE-E3FD-4BAF-A941-2866DBB566FE net.pipe://67116E74BA /TelemetrySession:{"TelemetryLevel":"all","IsOptedIn":false,"HostName":"Default","AppInsightsInstrumentationKey":null,"AsimovInstrumentationKey":null,"CollectorApiKey":"0c6ae279ed8443289764825290e4f9e2-1a736e7c-1324-4338-be46-fc2a58ae4d14-7255","AppId":1010,"UserId":"aba3357a-8994-4fe2-b42d-aa37a5852f8d","Id":"6381291b-3a03-45a3-8884-8b988f174d5e1759615549019","ProcessStartTime":134040891538876650,"SkuName":null,"VSExeVersion":null,"BucketFiltersToEnableWatsonForFaults":[],"BucketFiltersToAddDumpsToFaults":[]}
    0	24234942184	 67320	           /root/dotnet/dotnet /root/.vscode-server-insiders/extensions/ms-dotnettools.csdevkit-1.50.51-linux-arm64/components/CPS/platforms/linux-arm64/node_modules/@microsoft/visualstudio-projectsystem-buildhost.linux-arm64/Microsoft.VisualStudio.ProjectSystem.Server.BuildHost.dll
    0	92900611703	 67471	     /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslyn/Microsoft.CodeAnalysis.LanguageServer --logLevel Information --razorSourceGenerator /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.CodeAnalysis.Razor.Compiler.dll --razorDesignTimePath /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Targets/Microsoft.NET.Sdk.Razor.DesignTime.targets --devKitDependencyPath /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynDevKit/Microsoft.VisualStudio.LanguageServices.DevKit.dll --sessionId 6381291b-3a03-45a3-8884-8b988f174d5e1759615549019 --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.razorExtension/Microsoft.VisualStudioCode.RazorExtension.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.xamlTools/Microsoft.VisualStudio.DesignTools.CodeAnalysis.Diagnostics.dll --extension /root/.vscode-server-insiders/extensions/ms-dotnettools.csharp-2.90.60-linux-arm64/.roslynCopilot/Microsoft.VisualStudio.Copilot.Roslyn.LanguageServer.dll --telemetryLevel all --extensionLogDirectory /root/.vscode-server-insiders/data/logs/20251004T215533/exthost4/ms-dotnettools.csharp
    0	     0	 69569	   /bin/sh -c /usr/bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
    0	     0	 69570	     /usr/bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=

Workspace Info

|  Remote: Dev Container: Hakana @ desktop-linux|    Folder (development): 211 files|      File types: dll(35) json(26) js(17) map(17) ts(11) cache(9) cs(8)
|                  html(6) scss(6) props(4)
|      Conf files: package.json(3) dockerfile(2) devcontainer.json(1)
|                  settings.json(1) sln(1) csproj(1) tsconfig.json(1);

A/B Experiments

vsliv368cf:30146710
pythonvspyt551:31249597
nativeloc1:31118317
dwcopilot:31158714
dwoutputs:31242946
copilot_t_ci:31333650
g012b348:31231168
6gi0g917:31259950
pythonrdcb7:31268811
usemplatestapi:31297334
6518g693:31302842
0g1h6703:31329154
cs4_fixed:31391938
6abeh943:31336334
envsactivate1:31349248
editstats-enabled:31346256
aa_c:31379597
cloudbuttont:31366566
todos-1:31366868
qwen_all_req:31396049
multireplacestring:31382717
nb255704_tf:31377673
3efgi100_wstrepl:31382709
nes-auto-30:31394062
ae882133:31390472
trigger-command-fix:31379601
auto_model_enabled:31385282
node-fetch:31395554
grok-v2-prompt:31384641
use-responses-api:31390341
c91a3477:31396429

[dibarbet]

2025-10-04 22:05:56.332 [info] Language server process exited with null

Definitely seems like a crash. Can you try setting dotnet.server.crashDumpPath to a user writeable folder? Hopefully that will create a crash dump which we can take a look at. The best way to privately share the dump is to attach it to a new issue here - https://developercommunity.visualstudio.com/dotnet/report
Reference this issue in the title, and please include a link here so I can take a look.