Exception in building on Mac ARM64

[agocke]

Not much info, sorry, didn't have logging turned on:

   System.Linq -> /Users/angocke/code/runtime/artifacts/bin/System.Linq/ref/Release/net7.0/System.Linq.dll
/Users/angocke/code/runtime/.packages/microsoft.net.compilers.toolset/4.3.0-1.22215.4/tasks/net6.0/Microsoft.CSharp.Core.targets(75,5): error MSB3883: Unexpected exception:  [/Users/angocke/code/runtime/src/libraries/System.IO.UnmanagedMemoryStream/ref/System.IO.UnmanagedMemoryStream.csproj]
##vso[task.logissue type=error;sourcepath=/Users/angocke/code/runtime/.packages/microsoft.net.compilers.toolset/4.3.0-1.22215.4/tasks/net6.0/Microsoft.CSharp.Core.targets;linenumber=75;columnnumber=5;code=MSB3883;](NETCORE_ENGINEERING_TELEMETRY=Build) Unexpected exception: 
/Users/angocke/code/runtime/.packages/microsoft.net.compilers.toolset/4.3.0-1.22215.4/tasks/net6.0/Microsoft.CSharp.Core.targets(75,5): error : One or more errors occurred. (ReleaseMutex failed. WaitOne Id: 19 Release Id: 19) [/Users/angocke/code/runtime/src/libraries/System.IO.UnmanagedMemoryStream/ref/System.IO.UnmanagedMemoryStream.csproj]
##vso[task.logissue type=error;sourcepath=/Users/angocke/code/runtime/.packages/microsoft.net.compilers.toolset/4.3.0-1.22215.4/tasks/net6.0/Microsoft.CSharp.Core.targets;linenumber=75;columnnumber=5;code=;](NETCORE_ENGINEERING_TELEMETRY=Build) One or more errors occurred. (ReleaseMutex failed. WaitOne Id: 19 Release Id: 19)

[jrdodds]

@agocke Can you provide steps to reproduce?

With the current Arm64 version of .Net (which is the 6.0.4 / SDK 6.0.22 macOS Arm64 Installer) and a current repo (e049bfe), running ./build.sh doesn't produce exceptions for me.

[rainersigwald]

Thanks, we'll keep an eye out. If you do see it again please let us know.

@jaredpar I don't think this is actionable but this crash appears to be in the Csc task, so FYI.

[rainersigwald]

Closing due to age.