Language server crashes when adding a WSL workspace folder #8232
Description
Type: Bug
I am working on a project where I have a C# service from Windows that I will be connecting to from a Python app in WSL. I decided to add the WSL Python folder to the workspace to make the code visible to Copilot, and as soon as I added the folder the language server outputs a bundle of errors and then crashes.
Steps to Reproduce
On my machine I can reliably reproduce this when adding a workspace folder to \wsl$\ - I have not tested to see if this is only happening with Python folder or any folder at all.
Expected Behavior
I would expect to at least be able to browse the files in VSCode and make them available as context to Copilot.
Actual Behavior
A number of errors appear and the language server (and extension) crashes
Logs
I can provide more complete logs by email on request, viharp [at] microsoft. Here is the last part of the output log
2025-04-30 11:24:48.488 [info] received named pipe information from server
2025-04-30 11:24:48.488 [info] client has connected to server
2025-04-30 11:24:48.552 [info] [Info - 11:24:48 AM] [Program] Language server initialized
2025-04-30 11:24:48.645 [info] [Error - 11:24:48 AM] [initialize] [LanguageServerHost] System.UriFormatException: Invalid URI: The hostname could not be parsed.
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind, UriCreationOptions& creationOptions)
at System.Uri..ctor(String uriString)
at Roslyn.LanguageServer.Protocol.DocumentUriConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in //src/LanguageServer/Protocol/Protocol/Converters/DocumentUriConverter.cs:line 17
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.Metadata.JsonPropertyInfo1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
at System.Text.Json.Serialization.Converters.ObjectDefaultConverter1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value) at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
at System.Text.Json.Serialization.JsonCollectionConverter2.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TCollection& value) at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state) at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader& reader, ReadStack& state)
at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo1 jsonTypeInfo) at Roslyn.LanguageServer.Protocol.InitializeParamsWorkspaceFoldersConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/LanguageServer/Protocol/Protocol/Converters/InitializeParamsWorkspaceFoldersConverter.cs:line 31 at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
at System.Text.Json.Serialization.Metadata.JsonPropertyInfo1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader) at System.Text.Json.Serialization.Converters.ObjectDefaultConverter1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader& reader, ReadStack& state) at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1 utf8Json, JsonTypeInfo1 jsonTypeInfo, Nullable1 actualByteCount)
at System.Text.Json.JsonSerializer.Deserialize[TValue](JsonElement element, JsonSerializerOptions options)
at Microsoft.CommonLanguageServerProtocol.Framework.SystemTextJsonLanguageServer1.DeserializeRequest[TRequest](Object serializedRequest, RequestHandlerMetadata metadata) in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/SystemTextJsonLanguageServer.cs:line 49 at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem1.TryDeserializeRequest[TRequest](AbstractLanguageServer1 languageServer, RequestHandlerMetadata requestHandlerMetadata, Boolean isMutating, TRequest& request) in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 120 2025-04-30 11:24:48.652 [info] [Error - 11:24:48 AM] Server initialization failed. 2025-04-30 11:24:48.652 [info] Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] 2025-04-30 11:24:48.652 [info] [Error - 11:24:48 AM] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server. 2025-04-30 11:24:48.652 [info] Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] 2025-04-30 11:24:48.652 [info] [Error - 11:24:48 AM] Restarting server failed 2025-04-30 11:24:48.652 [info] Message: Invalid URI: The hostname could not be parsed. Code: -32000 [object Object] 2025-04-30 11:24:48.664 [info] [Error - 11:24:48 AM] [LanguageServerHost] System.UriFormatException: Invalid URI: The hostname could not be parsed. at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind, UriCreationOptions& creationOptions) at System.Uri..ctor(String uriString) at Roslyn.LanguageServer.Protocol.DocumentUriConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/LanguageServer/Protocol/Protocol/Converters/DocumentUriConverter.cs:line 17 at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
at System.Text.Json.Serialization.Metadata.JsonPropertyInfo1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader) at System.Text.Json.Serialization.Converters.ObjectDefaultConverter1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.JsonCollectionConverter2.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TCollection& value)
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader& reader, ReadStack& state) at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo1 jsonTypeInfo)
at Roslyn.LanguageServer.Protocol.InitializeParamsWorkspaceFoldersConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in //src/LanguageServer/Protocol/Protocol/Converters/InitializeParamsWorkspaceFoldersConverter.cs:line 31
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.Metadata.JsonPropertyInfo1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
at System.Text.Json.Serialization.Converters.ObjectDefaultConverter1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value) at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state) at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader& reader, ReadStack& state)
at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1 utf8Json, JsonTypeInfo1 jsonTypeInfo, Nullable1 actualByteCount) at System.Text.Json.JsonSerializer.Deserialize[TValue](JsonElement element, JsonSerializerOptions options) at Microsoft.CommonLanguageServerProtocol.Framework.SystemTextJsonLanguageServer1.DeserializeRequest[TRequest](Object serializedRequest, RequestHandlerMetadata metadata) in //src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/SystemTextJsonLanguageServer.cs:line 49
at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem1.TryDeserializeRequest[TRequest](AbstractLanguageServer1 languageServer, RequestHandlerMetadata requestHandlerMetadata, Boolean isMutating, TRequest& request) in //src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 120
--- End of stack trace from previous location ---
at Microsoft.CommonLanguageServerProtocol.Framework.AbstractLanguageServer1.DelegatingEntryPoint.InvokeAsync(IRequestExecutionQueue1 queue, Object requestObject, ILspServices lspServices, CancellationToken cancellationToken) in //src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/AbstractLanguageServer.cs:line 209
at Microsoft.CommonLanguageServerProtocol.Framework.SystemTextJsonLanguageServer1.SystemTextJsonDelegatingEntryPoint.ExecuteRequestAsync(Nullable1 request, CancellationToken cancellationToken) in //src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/SystemTextJsonLanguageServer.cs:line 87
at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem1.CreateRequestContextAsync[TRequest](IMethodHandler handler, RequestHandlerMetadata requestHandlerMetadata, AbstractLanguageServer1 languageServer, CancellationToken cancellationToken) in //src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 95
at Microsoft.CommonLanguageServerProtocol.Framework.RequestExecutionQueue1.ProcessQueueCoreAsync[TRequest,TResponse](IQueueItem1 work, IMethodHandler handler, RequestHandlerMetadata metadata, ConcurrentDictionary2 concurrentlyExecutingTasks, CancellationTokenSource currentWorkCts, CancellationToken cancellationToken) in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/RequestExecutionQueue.cs:line 337 at Microsoft.CommonLanguageServerProtocol.Framework.RequestExecutionQueue1.InvokeProcessCoreAsync(IQueueItem1 work, RequestHandlerMetadata metadata, IMethodHandler handler, MethodInfo methodInfo, ConcurrentDictionary2 concurrentlyExecutingTasks, CancellationTokenSource currentWorkCts, CancellationToken cancellationToken) in //src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/RequestExecutionQueue.cs:line 320
at Microsoft.CommonLanguageServerProtocol.Framework.RequestExecutionQueue`1.ProcessQueueAsync() in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/RequestExecutionQueue.cs:line 272
2025-04-30 11:24:48.664 [info] [Info - 11:24:48 AM] Error processing queue, shutting down
2025-04-30 11:24:48.667 [info] [Error - 11:24:48 AM] The Microsoft.CodeAnalysis.LanguageServer server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
2025-04-30 11:24:48.826 [info] Language server process exited with 0
Environment information
VSCode version: 1.99.3
C# Extension: 2.72.34
Using OmniSharp: false
Dotnet Information
.NET SDK: Version: 9.0.200 Commit: 90e8b202f2 Workload version: 9.0.200-manifests.69179adf MSBuild version: 17.13.8+cbc39bea8Runtime Environment:
OS Name: Windows
OS Version: 10.0.26406
OS Platform: Windows
RID: win-arm64
Base Path: C:\Program Files\dotnet\sdk\9.0.200\
.NET workloads installed:
There are no installed workloads to display.
Configured to use loose manifests when installing new manifests.
Host:
Version: 9.0.2
Architecture: arm64
Commit: 80aa709f5d
.NET SDKs installed:
9.0.200 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 8.0.13 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 9.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Other architectures found:
x64 [C:\Program Files\dotnet\x64]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x64\InstallLocation]
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]
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 |
|---|---|---|---|
| claude-dev | saoudrizwan | 3.13.3 | saoudrizwan.claude-dev-3.13.3 |
| copilot | GitHub | 1.311.0 | github.copilot-1.311.0 |
| copilot-chat | GitHub | 0.26.7 | github.copilot-chat-0.26.7 |
| csdevkit | ms-dotnettools | 1.18.25 | ms-dotnettools.csdevkit-1.18.25-win32-arm64 |
| csharp | ms-dotnettools | 2.72.34 | ms-dotnettools.csharp-2.72.34-win32-arm64 |
| debugpy | ms-python | 2025.6.0 | ms-python.debugpy-2025.6.0-win32-arm64 |
| docker | docker | 0.6.0 | docker.docker-0.6.0-win32-arm64 |
| dotnet-interactive-vscode | ms-dotnettools | 1.0.6177010 | ms-dotnettools.dotnet-interactive-vscode-1.0.6177010 |
| jupyter | ms-toolsai | 2025.3.0 | ms-toolsai.jupyter-2025.3.0-win32-arm64 |
| jupyter-keymap | ms-toolsai | 1.1.2 | ms-toolsai.jupyter-keymap-1.1.2 |
| jupyter-renderers | ms-toolsai | 1.1.0 | ms-toolsai.jupyter-renderers-1.1.0 |
| prettier-vscode | esbenp | 11.0.0 | esbenp.prettier-vscode-11.0.0 |
| python | ms-python | 2025.4.0 | ms-python.python-2025.4.0-win32-arm64 |
| remote-containers | ms-vscode-remote | 0.412.0 | ms-vscode-remote.remote-containers-0.412.0 |
| remote-explorer | ms-vscode | 0.5.2025021709 | ms-vscode.remote-explorer-0.5.2025021709 |
| remote-server | ms-vscode | 1.6.2025041509 | ms-vscode.remote-server-1.6.2025041509 |
| remote-ssh | ms-vscode-remote | 0.120.2025040915 | ms-vscode-remote.remote-ssh-0.120.2025040915 |
| remote-ssh-edit | ms-vscode-remote | 0.87.0 | ms-vscode-remote.remote-ssh-edit-0.87.0 |
| remote-wsl | ms-vscode-remote | 0.99.0 | ms-vscode-remote.remote-wsl-0.99.0 |
| rest-client | humao | 0.25.1 | humao.rest-client-0.25.1 |
| RunOnSave | emeraldwalk | 0.2.7 | emeraldwalk.runonsave-0.2.7 |
| semantic-kernel | ms-semantic-kernel | 0.12.1 | ms-semantic-kernel.semantic-kernel-0.12.1 |
| vscode-azurefunctions | ms-azuretools | 1.17.1 | ms-azuretools.vscode-azurefunctions-1.17.1 |
| vscode-azureresourcegroups | ms-azuretools | 0.10.9 | ms-azuretools.vscode-azureresourcegroups-0.10.9 |
| vscode-dapr | ms-azuretools | 0.8.0 | ms-azuretools.vscode-dapr-0.8.0 |
| vscode-docker | ms-azuretools | 1.29.6 | ms-azuretools.vscode-docker-1.29.6 |
| vscode-dotnet-runtime | ms-dotnettools | 2.3.3 | ms-dotnettools.vscode-dotnet-runtime-2.3.3 |
| vscode-eslint | dbaeumer | 3.0.10 | dbaeumer.vscode-eslint-3.0.10 |
| vscode-jupyter-cell-tags | ms-toolsai | 0.1.9 | ms-toolsai.vscode-jupyter-cell-tags-0.1.9 |
| vscode-jupyter-slideshow | ms-toolsai | 0.1.6 | ms-toolsai.vscode-jupyter-slideshow-0.1.6 |
| vscode-pylance | ms-python | 2025.4.1 | ms-python.vscode-pylance-2025.4.1 |
| vscode-remote-extensionpack | ms-vscode-remote | 0.26.0 | ms-vscode-remote.vscode-remote-extensionpack-0.26.0 |
| vscodeintellicode-csharp | ms-dotnettools | 2.2.3 | ms-dotnettools.vscodeintellicode-csharp-2.2.3-win32-arm64 |
| windows-ai-studio | ms-windows-ai-studio | 0.13.2025042908 | ms-windows-ai-studio.windows-ai-studio-0.13.2025042908-win32-arm64 |
Extension version: 2.72.34
VS Code version: Code 1.99.3 (17baf841131aa23349f217ca7c570c76ee87b957, 2025-04-15T23:18:46.076Z)
OS version: Windows_NT arm64 10.0.26406
Modes:
System Info
| Item | Value |
|---|---|
| CPUs | Snapdragon(R) X 12-core X1E80100 @ 3.40 GHz (12 x 2976) |
| GPU Status | 2d_canvas: enabled canvas_oop_rasterization: enabled_on 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: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: unavailable_software |
| Load (avg) | undefined |
| Memory (System) | 15.61GB (2.34GB free) |
| Process Argv | --folder-uri file:///d%3A/source/marvin/marvin --crash-reporter-id 097a69ed-ce81-4d29-bc65-97faec28d7ee |
| Screen Reader | no |
| VM | 0% |
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