msbuild: `UsingTask` fails randomly on Ubuntu x64, only reboot helps

Issue Description

Running on .NET 7 RC 1, Ubuntu x64 VM, I have intermittent errors - no changes to code and sometimes it works, sometimes it doesn’t. If I get into this state, nuking artifacts and .dotnet does not help, only reboot seems to help.

I have a very basic setup with custom MSBuild task:

• Project: https://github.com/dotnet/installer/blob/main/src/VirtualMonoRepo/Tasks/VirtualMonoRepo.Tasks.csproj
• Single custom task inside: https://github.com/dotnet/installer/blob/main/src/VirtualMonoRepo/Tasks/VirtualMonoRepo_Initialize.cs
• UsingTask here: https://github.com/dotnet/installer/blob/80ff259cd513dc72a84e347f5b27c9fd9f7094d6/src/VirtualMonoRepo/InitializeVMR.proj#L24

I get following error:

/home/prvysoky/installer/src/VirtualMonoRepo/InitializeVMR.proj(75,5): error MSB4062: The "Microsoft.DotNet.VirtualMonoRepo.Tasks.VirtualMonoRepo_Initialize" task could not be loaded from the assembly /home/prvysoky/installer/artifacts/bin/VirtualMonoRepo.Tasks/Debug/net7.0/VirtualMonoRepo.Tasks.dll. Culture is not supported. (Parameter 'name')
/home/prvysoky/installer/src/VirtualMonoRepo/InitializeVMR.proj(75,5): error MSB4062: vider>b__30_1 is an invalid culture identifier. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

Steps to Reproduce

It’s not a 100% repro but the commands needed are this:

git clone https://github.com/premun/installer
git checkout prvysoky/submodules
cd installer
./build.sh /p:InitializeVMR=true /p:TmpDir=/data/tmp /p:VmrDir=/data/vmr /bl

Either it fails very fast or it says “Initializing empty VMR…” and then it means the task was loaded properly.

Expected Behavior

Task should be loaded from the assembly without problems.

Actual Behavior

MSBuild fails to load the custom task with the following error:

/home/prvysoky/installer/src/VirtualMonoRepo/InitializeVMR.proj(75,5): error MSB4062: The "Microsoft.DotNet.VirtualMonoRepo.Tasks.VirtualMonoRepo_Initialize" task could not be loaded from the assembly /home/prvysoky/installer/artifacts/bin/VirtualMonoRepo.Tasks/Debug/net7.0/VirtualMonoRepo.Tasks.dll. Culture is not supported. (Parameter 'name')
/home/prvysoky/installer/src/VirtualMonoRepo/InitializeVMR.proj(75,5): error MSB4062: vider>b__30_1 is an invalid culture identifier. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

Analysis

Sometimes I get this:

/home/prvysoky/installer/src/VirtualMonoRepo/InitializeVMR.proj(75,5): error MSB4018: System.InvalidOperationException: A suitable constructor for type 't.han' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.

sometimes this:

/home/prvysoky/installer/src/VirtualMonoRepo/InitializeVMR.proj(75,5): error MSB4062: vider>b__30_1 is an invalid culture identifier. 

Seems like it’s getting pieces of the source file and using it as the culture?

Reboot seems to help always.

Versions & Configurations

• .NET 7.0.0-rc.1.22426.10