LSP server fails to initialize with: "Failed to find all versions of .NET Core MSBuild. Call to hostfxr_resolve_sdk2."

[keyboardDrummer]

Environment data

dotnet --info output:

rwillems@bcd0745419f2 roslyn % dotnet --info

Host:
  Version:      8.0.6
  Architecture: arm64
  Commit:       3b8b000a0e
  RID:          osx-arm64

.NET SDKs installed:
  6.0.407 [/usr/local/share/dotnet/sdk]
  7.0.202 [/usr/local/share/dotnet/sdk]
  7.0.305 [/usr/local/share/dotnet/sdk]
  7.0.306 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.5.23303.2 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.6.23330.14 [/usr/local/share/dotnet/sdk]
  8.0.101 [/usr/local/share/dotnet/sdk]
  8.0.203 [/usr/local/share/dotnet/sdk]
  8.0.301 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.15 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.8 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.5.23302.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.6.23329.11 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.15 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.8 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.9 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.5.23280.8 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.6.23329.7 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  x64   [/usr/local/share/dotnet/x64]
    registered at [/etc/dotnet/install_location_x64]

Environment variables:
  Not set

global.json file:
  /Users/rwillems/SourceCode/roslyn/global.json

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

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

VS Code version: 1.89.1 C# Extension version: v2.31.19

OmniSharp log

Using dotnet configured on PATH
Dotnet path: /usr/local/share/dotnet/dotnet
Activating C# standalone...
waiting for named pipe information from server...
[stdout] {"pipeName":"/var/folders/87/jdm41z_1137_p65dphdyvx1w0000gr/T/7047835c.sock"}
received named pipe information from server
attempting to connect client to server...
client has connected to server
[Info  - 3:13:15 PM] [Program] Language server initialized
[Info  - 3:13:16 PM] [LanguageServerProjectSystem] Loading /Users/rwillems/SourceCode/roslyn/Roslyn.sln...
[Error - 3:13:16 PM] [LanguageServerHost] Microsoft.CodeAnalysis.MSBuild.RemoteInvocationException: An exception of type System.InvalidOperationException was thrown: Failed to find all versions of .NET Core MSBuild. Call to hostfxr_resolve_sdk2. There may be more details in stderr.
   at Microsoft.CodeAnalysis.MSBuild.RpcClient.InvokeCoreAsync(Int32 targetObject, String methodName, List`1 parameters, Type expectedReturnType, CancellationToken cancellationToken) in /_/src/Workspaces/Core/MSBuild/Rpc/RpcClient.cs:line 163
   at Microsoft.CodeAnalysis.MSBuild.RpcClient.InvokeAsync[T](Int32 targetObject, String methodName, List`1 parameters, CancellationToken cancellationToken) in /_/src/Workspaces/Core/MSBuild/Rpc/RpcClient.cs:line 114
   at Microsoft.CodeAnalysis.LanguageServer.HostWorkspace.LanguageServerProjectSystem.OpenSolutionAsync(String solutionFilePath) in /_/src/Features/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/HostWorkspace/LanguageServerProjectSystem.cs:line 110
   at Microsoft.CodeAnalysis.LanguageServer.HostWorkspace.LanguageServerProjectSystem.OpenSolutionAsync(String solutionFilePath) in /_/src/Features/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/HostWorkspace/LanguageServerProjectSystem.cs:line 123
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`3.StartRequestAsync(TRequestContext context, IMethodHandler handler, CancellationToken cancellationToken) in /_/src/Features/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 148
Using dotnet configured on PATH

Steps to reproduce

• Clone the Roslyn GitHub repository. Run ./build.sh --restore and ./build.sh --build
• Open a Roslyn .cs file in VSCode
• Inspect the C# output channel

Expected behavior

C# extension starts successfully

Actual behavior

Code editor features such as go to definition are not working

Additional context

Add any other context about the problem here.

[dibarbet]

@keyboardDrummer typically the error you're seeing is related to a misconfiguration or corrupt dotnet installation. Can you confirm a few things?

1. Check that the C# extension installed is the arm64 version (run the 'open extensions folder' command and check the name of the C# extension folder, will be something like ms-dotnettools.csharp-2.32.14-<platform>)
2. Uninstalling the x64 version of dotnet

[KnorpelSenf]

I can reproduce this in two other environments on my own project (not Roslyn). Please let me know if I can help by providing more info.

WSL

Facing the same issue inside a Debian WSL.

Environment

$ dotnet --info
.NET SDK:
 Version:           8.0.301
 Commit:            1a0e9c0300
 Workload version:  8.0.300-manifests.f6879a9a
 MSBuild version:   17.10.4+10fbfbf2e

Runtime Environment:
 OS Name:     debian
 OS Version:  12
 OS Platform: Linux
 RID:         linux-x64
 Base Path:   /usr/share/dotnet/sdk/8.0.301/

.NET workloads installed:
There are no installed workloads to display.

Host:
  Version:      8.0.6
  Architecture: x64
  Commit:       3b8b000a0e

.NET SDKs installed:
  8.0.301 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 8.0.6 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 8.0.6 [/usr/share/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

Error log

Using dotnet configured on PATH
Dotnet path: /usr/share/dotnet/dotnet
Activating C# standalone...
waiting for named pipe information from server...
[stdout] {"pipeName":"/tmp/3546031e.sock"}
received named pipe information from server
attempting to connect client to server...
client has connected to server
[Info  - 11:43:51 AM] [Program] Language server initialized
[Info  - 11:43:52 AM] [LanguageServerProjectSystem] Loading /home/steffen/git/visitour/visitour/VisiTour.sln...
[Error - 11:43:53 AM] [LanguageServerHost] Microsoft.CodeAnalysis.MSBuild.Rpc.RemoteInvocationException: An exception of type System.InvalidOperationException was thrown: Failed to find all versions of .NET Core MSBuild. Call to hostfxr_resolve_sdk2. There may be more details in stderr.
   at Microsoft.CodeAnalysis.MSBuild.Rpc.RpcClient.InvokeCoreAsync(Int32 targetObject, String methodName, List`1 parameters, Type expectedReturnType, CancellationToken cancellationToken) in /_/src/Workspaces/Core/MSBuild/Rpc/RpcClient.cs:line 163
   at Microsoft.CodeAnalysis.MSBuild.Rpc.RpcClient.InvokeAsync[T](Int32 targetObject, String methodName, List`1 parameters, CancellationToken cancellationToken) in /_/src/Workspaces/Core/MSBuild/Rpc/RpcClient.cs:line 114
   at Microsoft.CodeAnalysis.LanguageServer.HostWorkspace.LanguageServerProjectSystem.OpenSolutionAsync(String solutionFilePath) in /_/src/Features/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/HostWorkspace/LanguageServerProjectSystem.cs:line 103
   at Microsoft.CodeAnalysis.LanguageServer.HostWorkspace.LanguageServerProjectSystem.OpenSolutionAsync(String solutionFilePath) in /_/src/Features/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/HostWorkspace/LanguageServerProjectSystem.cs:line 116
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`3.StartRequestAsync(TRequestContext context, IMethodHandler handler, CancellationToken cancellationToken) in /_/src/Features/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 157

More Info

I tried to find out if the right version of the extension is installed, but apparently that is not possible with WSL. I can only tell you that [email protected] is installed, but I don't know the platform of it.

Ubuntu

Facing the same issue on Ubuntu.

Environment

$ dotnet --info
.NET SDK:
 Version:           8.0.301
 Commit:            1a0e9c0300
 Workload version:  8.0.300-manifests.f6879a9a
 MSBuild version:   17.10.4+10fbfbf2e

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  20.04
 OS Platform: Linux
 RID:         linux-x64
 Base Path:   /usr/share/dotnet/sdk/8.0.301/

.NET workloads installed:
There are no installed workloads to display.

Host:
  Version:      8.0.6
  Architecture: x64
  Commit:       3b8b000a0e

.NET SDKs installed:
  6.0.423 [/usr/share/dotnet/sdk]
  8.0.301 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.31 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.6 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.31 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.6 [/usr/share/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

Error logs

Using dotnet configured on PATH
Dotnet path: /usr/share/dotnet/dotnet
Activating C# standalone...
waiting for named pipe information from server...
[stdout] {"pipeName":"/tmp/f1b10a28.sock"}
received named pipe information from server
attempting to connect client to server...
client has connected to server
[Info  - 12:13:46 PM] [Program] Language server initialized
[Info  - 12:13:47 PM] [LanguageServerProjectSystem] Loading /home/SERVERFLS/steffen.trog/git/visitour/visitour/VisiTour.sln...
[Error - 12:13:47 PM] [LanguageServerHost] Microsoft.CodeAnalysis.MSBuild.RemoteInvocationException: An exception of type System.InvalidOperationException was thrown: Failed to find all versions of .NET Core MSBuild. Call to hostfxr_resolve_sdk2. There may be more details in stderr.
   at Microsoft.CodeAnalysis.MSBuild.RpcClient.InvokeCoreAsync(Int32 targetObject, String methodName, List`1 parameters, Type expectedReturnType, CancellationToken cancellationToken) in /_/src/Workspaces/Core/MSBuild/Rpc/RpcClient.cs:line 162
   at Microsoft.CodeAnalysis.MSBuild.RpcClient.InvokeAsync[T](Int32 targetObject, String methodName, List`1 parameters, CancellationToken cancellationToken) in /_/src/Workspaces/Core/MSBuild/Rpc/RpcClient.cs:line 113
   at Microsoft.CodeAnalysis.LanguageServer.HostWorkspace.LanguageServerProjectSystem.OpenSolutionAsync(String solutionFilePath) in /_/src/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/HostWorkspace/LanguageServerProjectSystem.cs:line 110
   at Microsoft.CodeAnalysis.LanguageServer.HostWorkspace.LanguageServerProjectSystem.OpenSolutionAsync(String solutionFilePath) in /_/src/LanguageServer/Microsoft.CodeAnalysis.LanguageServer/HostWorkspace/LanguageServerProjectSystem.cs:line 123
   at Microsoft.CommonLanguageServerProtocol.Framework.QueueItem`3.StartRequestAsync(TRequestContext context, IMethodHandler handler, CancellationToken cancellationToken) in /_/src/LanguageServer/Microsoft.CommonLanguageServerProtocol.Framework/QueueItem.cs:line 148

More info

I have ms-dotnettools.csharp-2.34.12-linux-x64 installed.

[KnorpelSenf]

Is this in any way related to #6335?

[dibarbet]

Possibly, but unlikely I think. @KnorpelSenf can you set dotnet.server.trace to Trace and attach the C# output window logs again? That might provide more details on how the SDK load is failing.

Additionally, via what method did you originally install the SDK (e.g. install scripts, snap package, etc)?

[dibarbet]

And - if you could share the values set for the following environement variables (if any)

1. DOTNET_ROOT
2. DOTNET_HOST_PATH
3. DOTNET_MSBUILD_SDK_RESOLVER_CLI_DIR

[KnorpelSenf]

I am no longer able to reproduce it in any of the two environments. The error no longer appears in the logs. My project is loaded correctly, and so far, all basic LSP features work flawlessly (goto definition, find all references, variable highlighting etc).

I tried to check your git log if something relevant appears there ... but it's honestly a bit of a mess there so I did not investigate this further. Seems fixed anyway, so thanks!

[dibarbet]

Ah, great to here it works at least! Yeah if everything is working there probably won't be anything useful in the logs. Going to close this issue then.

[KnorpelSenf]

Yep, agree. Will report back if the problem reappears.

[JoeRobich]

I have seen this message when the global.json is pinning an SDK version that isn't installed.