.NET 5 linux-arm: Unable to attach to CoreCLR. Unknown Error: 0x80131c4f

[profix898]

Issue Description

I'm trying to build a simple console project in VS Code on Win 10 x64 using the .NET 5 (5.0.100) SDK. When deploying and executing the program remotely on a Raspberry Pi 4 using the 'vsdbg'-Debugger the debugger fails with the following error: Unable to attach to CoreCLR. Unknown Error: 0x80131c4f.

Steps to Reproduce

1. I have created a minimal console project with the following content:

RPiDemo.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>
</Project>

Program.cs

using System;

namespace RPiDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello RPi!");
        }
    }
}

The project is successfully compiled in VS Code on Win 10 x64 using the locally installed .NET 5 SDK. The project is published for 'linux-arm' and copied to the Raspberry Pi 4 (with Raspian 10, latest version as of today) with the following command:

dotnet publish -c Release -r linux-arm -o ./publish/linux-arm ${workspaceFolder} ; scp -rp -P 2222 ./publish/linux-arm/ root@192.168.81.129:/opt/RPiDemo

I'm essentially following the instructions at https://github.com/OmniSharp/omnisharp-vscode/wiki/Remote-Debugging-On-Linux-Arm (or similar tutorials on the internet).

The project is then launched on the RPi with the 'vsdbg' remote debugger. My launch.json looks like this:

{
    "configurations": [        
        {
            "name": "Launch LOCAL",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            "program": "${workspaceFolder}/bin/Debug/net5.0/RPiDemo.dll",
            "args": [],
            "cwd": "${workspaceFolder}",
            "stopAtEntry": false,
            "console": "internalConsole"
        }, 
        {
            "name": "Launch REMOTE",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "BuildPublishCopyLinuxARM",
            "program": "/usr/bin/dotnet",
            "args": [
                "/opt/RPiDemo/RPiDemo.dll"
            ],
            "cwd": "/opt/RPiDemo",
            "stopAtEntry": false,
            "console": "internalConsole",
            "pipeTransport": {
                "pipeCwd": "${workspaceRoot}",
                "pipeProgram": "ssh",
                "pipeArgs": [
                    "-T",
                    "-p", "2222",
                    "root@192.168.81.129"
                ],
                "quoteArgs": true,
                "debuggerPath": "/usr/bin/vsdbg/vsdbg"
            },
            "logging": {
                "engineLogging": true,
                "programOutput": true,
                "exceptions": true
            }
        },
    ]
}

Expected Behavior

Debugger should launch and attach to the process on the RPi and provide debug information to VS Code.

Actual Behavior

Debugger prints the following error message: Unable to attach to CoreCLR. Unknown Error: 0x80131c4f.
I have then enabled logging via "engineLogging": true, to obtain more details (as shown in the log below).

I'd like to note, that the console project works perfectly both locally on the Win 10 x64 host and also when being launched manually on the RPi via the dotnet RPiDemo.dll command (directly in the published directory '/opt/RPiDemo').

Logs

OmniSharp log

Details

Starting: "ssh" -T -p 2222 root@192.168.81.129 "/usr/bin/vsdbg/vsdbg --interpreter=vscode" -> (C) {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"coreclr","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en-us","supportsProgressReporting":true,"supportsInvalidatedEvent":true},"type":"request","seq":1} -> (C) {"command":"launch","arguments":{"name":"Launch REMOTE","type":"coreclr","request":"launch","preLaunchTask":"BuildPublishCopyLinuxARM","program":"/usr/bin/dotnet","args":["/opt/RPiDemo/RPiDemo.dll"],"cwd":"/opt/RPiDemo","stopAtEntry":false,"requireExactSource":false,"console":"internalConsole","pipeTransport":{"pipeCwd":"D:\\Repos\\Demo\\RPiDemo","pipeProgram":"ssh","pipeArgs":["-T","-p","2222","root@192.168.81.129"],"quoteArgs":true,"debuggerPath":"/usr/bin/vsdbg/vsdbg"},"logging":{"engineLogging":false,"programOutput":true,"exceptions":true},"__configurationTarget":5,"internalConsoleOptions":"openOnSessionStart","__sessionId":"7be5a8c7-37ec-4071-b82e-6f72e8fd2038"},"type":"request","seq":2} <- (E) {"seq":2,"type":"event","event":"output","body":{"category":"console","output":"-------------------------------------------------------------------\nYou may only use the Microsoft .NET Core Debugger (vsdbg) with\nVisual Studio Code, Visual Studio or Visual Studio for Mac software\nto help you develop and test your applications.\n-------------------------------------------------------------------\n","severity":"ok"}} ------------------------------------------------------------------- You may only use the Microsoft .NET Core Debugger (vsdbg) with Visual Studio Code, Visual Studio or Visual Studio for Mac software to help you develop and test your applications. ------------------------------------------------------------------- <- (R) {"seq":3,"type":"response","request_seq":2,"success":true,"command":"launch"} <- (E) {"seq":4,"type":"event","event":"initialized","body":{}} -> (C) {"command":"setFunctionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":3} <- (R) {"seq":5,"type":"response","request_seq":3,"success":true,"command":"setFunctionBreakpoints","body":{"breakpoints":[]}} -> (C) {"command":"setExceptionBreakpoints","arguments":{"filters":["user-unhandled"]},"type":"request","seq":4} <- (R) {"seq":6,"type":"response","request_seq":4,"success":true,"command":"setExceptionBreakpoints"} -> (C) {"command":"configurationDone","type":"request","seq":5} <- (E) {"seq":7,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessCreate","data":{"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"10","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"b7159782","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"16.8.11013.1 commit:4b0f186e434a6a8e833baeddc7bd2fad8dd08f41"}}} <- (E) {"seq":8,"type":"event","event":"process","body":{"name":"/usr/bin/dotnet","systemProcessId":1420,"isLocalProcess":false,"startMethod":"launch"}} <- (E) {"seq":9,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/Launch","data":{"VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Launch.Duration":180,"VS.Diagnostics.Debugger.vsdbg.VisualizerFileUsed":false,"VS.Diagnostics.Debugger.vsdbg.TargetType":"Live","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"10","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"b7159782","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.SourceFileMappings":0,"VS.Diagnostics.Debugger.vsdbg.Version":"16.8.11013.1 commit:4b0f186e434a6a8e833baeddc7bd2fad8dd08f41"}}} <- (R) {"seq":10,"type":"response","request_seq":5,"success":true,"command":"configurationDone"} -> (C) {"command":"threads","type":"request","seq":6} <- (R) {"seq":11,"type":"response","request_seq":6,"success":true,"command":"threads","body":{"threads":[]}} <- (E) {"seq":12,"type":"event","event":"output","body":{"category":"stderr","output":"Unable to attach to CoreCLR. Unknown Error: 0x80131c4f","severity":"error"}} Unable to attach to CoreCLR. Unknown Error: 0x80131c4f

Environment information

VSCode version: 1.51.1
C# Extension: 1.23.6

Dotnet Information

.NET SDK (reflecting any global.json): Version: 5.0.100 Commit: 5044b93829

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19042
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\5.0.100\

Host (useful for support):
Version: 5.0.0
Commit: cf258a14b7

.NET SDKs installed:
2.1.701 [C:\Program Files\dotnet\sdk]
2.1.801 [C:\Program Files\dotnet\sdk]
2.2.207 [C:\Program Files\dotnet\sdk]
2.2.401 [C:\Program Files\dotnet\sdk]
5.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

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

Visual Studio Code Extensions

Extension	Author	Version
code-runner	formulahendry	0.11.1
cpptools	ms-vscode	1.1.1
csharp	ms-dotnettools	1.23.6
EditorConfig	EditorConfig	0.15.1
gitlens	eamodio	11.0.1
Ionide-fsharp	Ionide	4.17.0
jupyter	ms-toolsai	2020.11.358541065
markdown-all-in-one	yzhang	3.4.0
path-intellisense	christian-kohler	2.3.0
powershell	ms-vscode	2020.6.0
python	ms-python	2020.11.358366026
remote-containers	ms-vscode-remote	0.148.1
remote-ssh	ms-vscode-remote	0.56.0
remote-ssh-edit	ms-vscode-remote	0.56.0
remote-wsl	ms-vscode-remote	0.51.3
resourcemonitor	mutantdino	1.0.7
vscode-icons	vscode-icons-team	11.0.0
vsliveshare	ms-vsliveshare	1.0.3121
xml	DotJoshJohnson	2.5.1

[profix898]

I just tested the same procedure with .NET Core 3.1 (3.1.404) and it works!
For the test, all I did was to replace the targetFramework with netcoreapp3.1 and I (of course) installed the 3.1 SDK on the RPi. Everything else (incl. launch.json, etc. configuration) was the same as before. So apparently, this is a .NET 5 runtime/debugger issue.

[gregg-miskelly]

Thanks @profix898 This looks like a regression in the .NET runtime. I opened dotnet/runtime#44745 to track it.

[ManfredLange]

Looks as if this is not the only problem:

ms-dotnettools.csharp version 1.23.6 + net5.0 => 943 problems reported
ms-dotnettools.csharp version 1.23.6 + netcoreapp3.1 => 8 problems reported

Restarting the language server makes no difference to this observation.

In my experience this shows that at this point omnisharp's language service is currently unusable with .NET 5.0 when running it in a docker container and using remote development.

My environment:

• VS Code 1.51.1
• Docker Desktop for Windows 2.5.0.1
• ms-dotnettools.csharp version 1.23.6
• Docker base image: mcr.microsoft.com/dotnet/sdk:5.0 (when showing 943 problems)
• Docker base image: mcr.microsoft.com/dotnet/sdk:3.1 (when showing 8 problems)

[gregg-miskelly]

This has now been fixed by the .NET team. It will work when the target app is running on .NET 5.0.2+.

[RamblingGeekUK]

So I just hit this today, when will 5.0.2 be released? 5.0.101/5.0.1 showing currently ?

[lokinfey]

I think I have the same problem