Unhandled exception. System.BadImageFormatException

[StacyCMay]

Issue Description

Unhandled exception. System.BadImageFormatException

Steps to Reproduce

Upgraded to version 1.25.0

Expected Behavior

CSharp extension loads without error

Actual Behavior

Unhandled exception. System.BadImageFormatException
Could not load file or assembly '~/.vscode/extensions/ms-dotnettools.csharp-1.25.0-darwin-arm64/.omnisharp/1.39.0-net6.0/OmniSharp.dll'. An attempt was made to load a program with an incorrect format.

Logs

OmniSharp log

C# log

Starting OmniSharp server at 5/24/2022, 4:11:22 PM Target: ~/Documents/Corporate/Clients/Tantus/PCL/JSI/Repos/JSIv2Platform-Deploy/Solutions/JSI.Core/JSI.Core.sln

OmniSharp server started with .NET 6.0.300
.
Path: ~/.vscode/extensions/ms-dotnettools.csharp-1.25.0-darwin-arm64/.omnisharp/1.39.0-net6.0/OmniSharp.dll
PID: 10191

Unhandled exception. System.BadImageFormatException: Could not load file or assembly '~/.vscode/extensions/ms-dotnettools.csharp-1.25.0-darwin-arm64/.omnisharp/1.39.0-net6.0/OmniSharp.dll'. An attempt was made to load a program with an incorrect format.

File name: '~/.vscode/extensions/ms-dotnettools.csharp-1.25.0-darwin-arm64/.omnisharp/1.39.0-net6.0/OmniSharp.dll'

Environment information

VSCode version: 1.67.2
C# Extension: 1.25.0

Mono Information

OmniSharp using mono :6.12.0

Dotnet Information

.NET SDK (reflecting any global.json): Version: 6.0.300 Commit: 8473146e7d

Runtime Environment:
OS Name: Mac OS X
OS Version: 12.4
OS Platform: Darwin
RID: osx.12-x64
Base Path: /usr/local/share/dotnet/x64/sdk/6.0.300/

Host (useful for support):
Version: 6.0.5
Commit: 70ae3df4a6

.NET SDKs installed:
3.1.416 [/usr/local/share/dotnet/x64/sdk]
3.1.417 [/usr/local/share/dotnet/x64/sdk]
3.1.418 [/usr/local/share/dotnet/x64/sdk]
3.1.419 [/usr/local/share/dotnet/x64/sdk]
5.0.404 [/usr/local/share/dotnet/x64/sdk]
5.0.405 [/usr/local/share/dotnet/x64/sdk]
5.0.406 [/usr/local/share/dotnet/x64/sdk]
5.0.407 [/usr/local/share/dotnet/x64/sdk]
5.0.408 [/usr/local/share/dotnet/x64/sdk]
6.0.101 [/usr/local/share/dotnet/x64/sdk]
6.0.102 [/usr/local/share/dotnet/x64/sdk]
6.0.103 [/usr/local/share/dotnet/x64/sdk]
6.0.104 [/usr/local/share/dotnet/x64/sdk]
6.0.105 [/usr/local/share/dotnet/x64/sdk]
6.0.300 [/usr/local/share/dotnet/x64/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 3.1.22 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.23 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.24 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.25 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.13 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.14 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.15 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.16 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.17 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.1 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.2 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.3 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.4 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.5 [/usr/local/share/dotnet/x64/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.22 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.23 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.24 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.25 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.13 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.14 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.15 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.16 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.17 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.1 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.2 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.3 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.4 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.5 [/usr/local/share/dotnet/x64/shared/Microsoft.NETCore.App]

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

Visual Studio Code Extensions

Extension	Author	Version
angular-console	nrwl	17.17.0
angular-essentials	johnpapa	13.0.0
Angular2	johnpapa	13.0.0
application-insights	VisualStudioOnlineApplicationInsights	0.4.2
argutec-azure-repos	argutec	1.2007.15
armview	bencoleman	0.4.6
azure-account	ms-vscode	0.10.1
azure-event-hub-explorer	Summer	0.1.1
azure-iot-edge	vsciot-vscode	1.25.9
azure-iot-toolkit	vsciot-vscode	2.16.6
azure-iot-tools	vsciot-vscode	0.3.0
azure-pipelines	ms-azure-devops	1.205.0
azure-storage-explorer	formulahendry	0.1.2
azurecli	ms-vscode	0.5.0
azurerm-vscode-tools	msazurermtools	0.15.7
csharp	ms-dotnettools	1.25.0
data-workspace-vscode	ms-mssql	0.2.0
debugger-for-edge	msjsdiag	1.0.15
EditorConfig	EditorConfig	0.16.4
jupyter	ms-toolsai	2022.4.1021342353
jupyter-keymap	ms-toolsai	1.0.0
jupyter-renderers	ms-toolsai	1.0.6
material-icon-theme	PKief	4.17.0
msbuild-project-tools	tintoy	0.4.3
mssql	ms-mssql	1.14.2
ng-template	Angular	13.3.4
powershell	ms-vscode	2022.5.1
prettier-vscode	esbenp	9.5.0
python	ms-python	2022.6.2
remote-containers	ms-vscode-remote	0.234.0
remote-ssh	ms-vscode-remote	0.80.0
remote-ssh-edit	ms-vscode-remote	0.80.0
remote-wsl	ms-vscode-remote	0.66.3
rest-client	humao	0.24.6
sql-database-projects-vscode	ms-mssql	0.16.2
svn-scm	johnstoncode	2.15.5
vscode-ai	ms-toolsai	0.10.0
vscode-ai-remote	ms-toolsai	0.12.0
vscode-apimanagement	ms-azuretools	1.0.3
vscode-azureappservice	ms-azuretools	0.24.0
vscode-azurefunctions	ms-azuretools	1.7.0
vscode-azureresourcegroups	ms-azuretools	0.5.0
vscode-azurestorage	ms-azuretools	0.14.0
vscode-azurevirtualmachines	ms-azuretools	0.6.0
vscode-bicep	ms-azuretools	0.6.18
vscode-cosmosdb	ms-azuretools	0.19.0
vscode-docker	ms-azuretools	1.22.0
vscode-dotnet-runtime	ms-dotnettools	1.5.0
vscode-eslint	dbaeumer	2.2.2
vscode-iot-device-cube	vsciot-vscode	0.3.0
vscode-iot-workbench	vsciot-vscode	0.16.0
vscode-logicapps	ms-azuretools	1.1.6
vscode-node-azure-pack	ms-vscode	0.3.0
vscode-npm-script	eg2	0.3.25
vscode-openapi	42Crunch	4.9.5
vscode-peacock	johnpapa	4.0.1
vscode-pylance	ms-python	2022.5.2
vscode-remote-extensionpack	ms-vscode-remote	0.21.0
vscode-yaml	redhat	1.7.0
vscodeintellicode	VisualStudioExptTeam	1.2.21
winteriscoming	johnpapa	1.4.4

[StacyCMay]

Reverting to 1.24.4 works.

[JoeRobich]

@StacyCMay This likely means that you have the x64 build of the .NET SDK installed. If you uninstall and install the arm64 instead, it should start up fine. Sorry for the inconvenience.

[vudzero]

I can confirm that we must revert back to 1.24.4 if on a MacOS with M1 arm64 CPU and x64 dotnet SDK installed

[ElDuderini]

I can confirm that we must revert back to 1.24.4 if on a MacOS with M1 arm64 CPU and x64 dotnet SDK installed

This worked for me too, thanks!

[filipw]

I will close this because it is the expected behavior.

Having just the emulated x64 on arm64 is not the supported scenario by OmniSharp. However, you can first install arm64 dotnet, and then install x64 dotnet in which case, dotnet installer places it under the x64 folder:

• /usr/local/share/dotnet is now your (default) arm64 dotnet
• /usr/local/share/dotnet/x64 is now your x64 dotnet

In this case you could always toggle to x64 by running e.g. export PATH=/usr/local/share/dotnet/x64:$PATH. You can find more here https://github.com/dotnet/designs/blob/main/accepted/2021/x64-emulation-on-arm64/x64-emulation.md

[ElDuderini]

I will close this because it is the expected behavior.

Having just the emulated x64 on arm64 is not the supported scenario by OmniSharp. However, you can first install arm64 dotnet, and then install x64 dotnet in which case, dotnet installer places it under the x64 folder:

* `/usr/local/share/dotnet` is now your (default) arm64 dotnet

* `/usr/local/share/dotnet/x64` is now your x64 dotnet

In this case you could always toggle to x64 by running e.g. export PATH=/usr/local/share/dotnet/x64:$PATH. You can find more here https://github.com/dotnet/designs/blob/main/accepted/2021/x64-emulation-on-arm64/x64-emulation.md

Would you happen to know how I would go about setting my default base path to the arm64 SDK? I installed x64 first and I just installed arm64 today but I don't know how I get dotnet linked to that new SDK. When I type in dotnet --info it still gives me information about the old x64 SDK with the incorrect base path.

[filipw]

This is mostly outlined here by Rich dotnet/sdk#22380 (comment)
Ideally you would nuke the old x64 installation using

sudo rm -r /usr/local/share/dotnet
sudo rm -r /etc/dotnet

Then you would first install arm64 dotnet as this is the recommended variant for arm devices, and if you still need x64 for some specific reason, you install it second. Then arm64 dotnet is your "main" one, and you can "opt into" x64 by either doing a temporary export, creating a specific alias (such as dotnet64) or a switch dotnet run -a x64

[ElDuderini]

This is mostly outlined here by Rich dotnet/sdk#22380 (comment) Ideally you would nuke the old x64 installation using

sudo rm -r /usr/local/share/dotnet
sudo rm -r /etc/dotnet

Then you would first install arm64 dotnet as this is the recommended variant for arm devices, and if you still need x64 for some specific reason, you install it second. Then arm64 dotnet is your "main" one, and you can "opt into" x64 by either doing a temporary export, creating a specific alias (such as dotnet64) or a switch dotnet run -a x64

Thanks. After reinstalling .net and configuring the settings in vscode to use the right mono path, I got the new version of the plugin to work with unity code.

[adamshaylor]

Using the Arm build isn’t an option for my team. We’re working on a project that relies on PostSharp, which appears to have no intention of supporting Arm. OmniSharp was working for us prior to 1.25.

[JoeRobich]

@adamshaylor We can look at adding an option for Mac users to override the detected architecture. But until a change like that goes in, you have a couple options at this time:

• Downgrade to 1.24.4 and turn off auto-update
• Set omnisharp.useModernNet to false and install the preview Mono (https://www.mono-project.com/download/preview/). The preview release ships with a 16.10 MSBuild which can support .NET 6 development.

[adamshaylor]

We’re also looking into migrating to PostSharp metalama. It’s not a one-to-one replacement, but if we understand correctly, uses Rosylyn under the hood and therefore in theory would allow us to run .NET natively on Arm architecture if we can port our existing code to use it.

[miiik4]

If you found this issue by Googling the error message, it might be worth trying out dotnet run -a x64 after installing the x64 version of the SDK you are trying to use. That solved my issue 🙂