[outerloop testing] error: ' ', hexadecimal value 0x0B, is an invalid character.

[sandreenko]

Example output:

C:\dotnetbuild\work\1cd48505-c383-44b8-b581-fef4ec59cd43\Work\d9955b45-7bd1-4cb5-829e-7511ff3e8e61\Exec>C:\dotnetbuild\work\1cd48505-c383-44b8-b581-fef4ec59cd43\Payload\CoreRun.exe C:\dotnetbuild\work\1cd48505-c383-44b8-b581-fef4ec59cd43\Payload\xunit.console.dll JIT\Regression\JIT.Regression.XUnitWrapper.dll -parallel collections -nocolor -noshadow -xml testResults.xml -trait TestGroup=JIT.Regression.CLR-x86-JIT.V1-M09-M11 
Microsoft.DotNet.XUnitConsoleRunner v2.5.0 (32-bit .NET Core 3.0.0-dev.19266.1)
  Discovering: JIT.Regression.XUnitWrapper
  Discovered:  JIT.Regression.XUnitWrapper
  Starting:    JIT.Regression.XUnitWrapper
  Finished:    JIT.Regression.XUnitWrapper
=== TEST EXECUTION SUMMARY ===
   JIT.Regression.XUnitWrapper  Total: 410, Errors: 0, Failed: 0, Skipped: 0, Time: 541.938s
error: '�', hexadecimal value 0x0B, is an invalid character.

We saw it in several jobs, for example: 1, 2.

cc @dotnet/jit-contrib

Link dotnet/coreclr#24620.

[echesakov]

Seems that issue was hit before dotnet/buildtools#565