Debugging does not work on Mac 12.0.1 with M1 (arm64) and .NET 6

[skyflyer]

The debugging fails with error Unable to attach to CoreCLR. Unknown Error: 0x80131c3c.

Interestingly, the debugger is installed for x64 and not arm64 - I'm not sure if that is by design or by mistake. I include the extension install logs below.

Environment data

VSCode version: 1.62.1
C# Extension: 1.23.16

Mono Information

OmniSharp using built-in mono

Dotnet Information

.NET SDK (reflecting any global.json): Version: 6.0.100 Commit: 9e8b04bbff

Runtime Environment:
OS Name: Mac OS X
OS Version: 12.0
OS Platform: Darwin
RID: osx-arm64
Base Path: /usr/local/share/dotnet/sdk/6.0.100/

Host (useful for support):
Version: 6.0.0
Commit: 4822e3c3aa

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

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

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

Visual Studio Code Extensions

Extension	Author	Version
bracket-pair-colorizer	CoenraadS	1.0.61
code-spell-checker	streetsidesoftware	2.0.12
csharp	ms-dotnettools	1.23.16
dart-code	Dart-Code	3.28.0
flutter	Dart-Code	3.28.0
gitlens	eamodio	11.6.1
go	golang	0.29.0
prettier-vscode	esbenp	9.0.0
python	ms-python	2021.11.1422169775
rainbow-csv	mechatroner	1.9.1
remote-containers	ms-vscode-remote	0.205.2
remote-ssh	ms-vscode-remote	0.66.1
remote-ssh-edit	ms-vscode-remote	0.66.1
rest-client	humao	0.24.5
rust	rust-lang	0.7.8
vscode-docker	ms-azuretools	1.17.0
vscode-pylance	ms-python	2021.11.1
vscode-todo-highlight	wayou	1.0.5
xml	DotJoshJohnson	2.5.1

OmniSharp log

No logs.

Steps to reproduce

1. dotnet new console
2. Add a breakpoint to Console.WriteLine("Hello world")
3. Start debugging

Expected behavior

The debugger would start and stop on the breakpoint.

Actual behavior

The debugger will exit without any logs.

As instructed, I manually started vsdbg-ui and collected logs and also reinstalled c# extension.

Extension install logs (N.B.: it installs x86_64 binaries):

Installing C# dependencies...
Platform: darwin, x86_64

Downloading package 'OmniSharp for OSX' (40339 KB).................... Done!
Validating download...
Integrity Check succeeded.
Installing package 'OmniSharp for OSX'

Downloading package '.NET Core Debugger (macOS / x64)' (45945 KB).................... Done!
Validating download...
Integrity Check succeeded.
Installing package '.NET Core Debugger (macOS / x64)'

Downloading package 'Razor Language Server (macOS / x64)' (61258 KB).................... Done!
Installing package 'Razor Language Server (macOS / x64)'

Finished

The output of vsdbg-ui:

-> (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-gb","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true},"type":"request","seq":1}
-> (C) {"command":"launch","arguments":{"name":".NET Core Launch (console)","type":"coreclr","request":"launch","preLaunchTask":"build","program":"/Users/miha/tmp/net6/bin/Debug/net6.0/net6.dll","args":[],"cwd":"/Users/miha/tmp/net6","console":"internalConsole","stopAtEntry":true,"logging":{"engineLogging":false},"debugServer":4711,"__configurationTarget":5,"internalConsoleOptions":"openOnSessionStart","__sessionId":"c289e805-6e10-41cf-893b-5c8cd0f8531f"},"type":"request","seq":2}
<- (E) {"seq":4,"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":5,"type":"response","request_seq":2,"success":true,"command":"launch"}
<- (E) {"seq":6,"type":"event","event":"initialized","body":{}}
-> (C) {"command":"setBreakpoints","arguments":{"source":{"name":"Program.cs","path":"/Users/miha/tmp/net6/Program.cs","checksums":[{"algorithm":"SHA1","checksum":"9e404d5e8b1eaba8a8a14e5bf2f7f501bcf1b6f3"},{"algorithm":"SHA256","checksum":"00cff05f5d1caeeb6a8a5e9ccafe909a85a5b80f26f355910d435b63aff65d5d"},{"algorithm":"SHA1","checksum":"df3275f19f162ae7d23e83e6a2acd764aa8a76c1"},{"algorithm":"SHA256","checksum":"9fcefc4e7071dfe06448a0a7c8e5ff53e8d2dae1edeac4410386af6df0bbb2c2"}]},"lines":[1,3],"breakpoints":[{"line":1},{"line":3}],"sourceModified":false},"type":"request","seq":3}
<- (R) {"seq":7,"type":"response","request_seq":3,"success":true,"command":"setBreakpoints","body":{"breakpoints":[{"id":1,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":1},{"id":2,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":3}]}}
-> (C) {"command":"setFunctionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":4}
<- (R) {"seq":8,"type":"response","request_seq":4,"success":true,"command":"setFunctionBreakpoints","body":{"breakpoints":[]}}
-> (C) {"command":"setExceptionBreakpoints","arguments":{"filters":[],"filterOptions":[{"filterId":"user-unhandled"}]},"type":"request","seq":5}
<- (R) {"seq":9,"type":"response","request_seq":5,"success":true,"command":"setExceptionBreakpoints","body":{"breakpoints":[{"verified":true}]}}
-> (C) {"command":"configurationDone","type":"request","seq":6}
<- (E) {"seq":10,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessCreate","data":{"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"21.1.0","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"Darwin","VS.Diagnostics.Debugger.vsdbg.Version":"17.0.10712.2 commit:70a83505117741ba30f92c713a4bb0d0395c3197","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Darwin"}}}
<- (E) {"seq":11,"type":"event","event":"process","body":{"name":"/Users/miha/tmp/net6/bin/Debug/net6.0/net6.dll","systemProcessId":49523,"isLocalProcess":true,"startMethod":"launch"}}
<- (E) {"seq":12,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":false,"message":"No symbols have been loaded for this document.","line":1}}}
<- (E) {"seq":13,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":false,"message":"No symbols have been loaded for this document.","line":3}}}
<- (E) {"seq":14,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/Launch","data":{"VS.Diagnostics.Debugger.vsdbg.Launch.Duration":1022,"VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.SourceFileMappings":0,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"21.1.0","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"Darwin","VS.Diagnostics.Debugger.vsdbg.TargetType":"Live","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Darwin","VS.Diagnostics.Debugger.vsdbg.VisualizerFileUsed":false,"VS.Diagnostics.Debugger.vsdbg.Version":"17.0.10712.2 commit:70a83505117741ba30f92c713a4bb0d0395c3197"}}}
<- (R) {"seq":15,"type":"response","request_seq":6,"success":true,"command":"configurationDone"}
-> (C) {"command":"threads","type":"request","seq":7}
<- (R) {"seq":16,"type":"response","request_seq":7,"success":true,"command":"threads","body":{"threads":[]}}
<- (E) {"seq":17,"type":"event","event":"output","body":{"category":"stderr","output":"Unable to attach to CoreCLR. Unknown Error: 0x80131c3c","severity":"error"}}
Unable to attach to CoreCLR. Unknown Error: 0x80131c3c

[gregg-miskelly]

Are you using x64 VS Code? I believe what is going on is that the C# extension process is running in x64 node, so it thinks it is on an x64 machine.

[skyflyer]

@gregg-miskelly, you're absolutely right. For posterity: I downloaded VS Code for Apple silicon and debugger now works.

Thank you!
/close

[EthanSK]

I'm having the same issue, but my VScode is running in Apple silicon mode. The logs still say Starting OmniSharp on MacOS 12.0.1 (x64)

Trying to use azure functions
The c# extension even says its running under darwin, arm64
Even tried reinstalling everything and restarting laptop.

[gregg-miskelly]

@EthanSK please open a new issue.