Error Error: 'IOException' 'The semaphore timeout period has expired reported but not really an issue

[robvdnieuw]

10.0.103:

During building with Visual Studio 2026 18.3.0 we encounter the following:

EXEC(0,0): Error Error: 'IOException' 'The semaphore timeout period has expired.

It appears that this error is reported, but the build is not failing as a retry is done, but as the error is reported as a canonical error format the exec msbuild task https://learn.microsoft.com/en-us/visualstudio/msbuild/exec-task?view=visualstudio reports an error and stops.

But as this is not really an error as dotnet build is not stopping can the following line be adapted that, it does not report an canonical error

https://github.com/dotnet/roslyn/blob/main/src/Compilers/Shared/BuildServerConnection.cs#L415

[jjonescz]

the exec msbuild task https://learn.microsoft.com/en-us/visualstudio/msbuild/exec-task?view=visualstudio reports an error and stops.

I'm not sure what do you mean by this. Where exactly is this Exec task being used? There shouldn't be any Exec task used during normal dotnet build when invoking the C# compiler.

[robvdnieuw]

We call sonarqube buildwrapper with msbuild in an exec task

<Exec 
  Command='build-wrapper-win-x86-64.exe  "$(MSBuildBinPath)\MSBuild.exe" xxx.sln -p/parameters'
  WorkingDirectory="$(SubSystemDir)">
  <Output TaskParameter="ExitCode" PropertyName="SQBuildWrapperExitCode" />
</Exec>

to workaround this issue we now need to do

<Exec
  Command='build-wrapper-win-x86-64.exe  "$(MSBuildBinPath)\MSBuild.exe" xxx.sln -p/parameters'
  CustomErrorRegularExpression="(?i)\berror\b\s+(?!error\b)\w*\d*:"
  CustomWarningRegularExpression="(?i)\bwarning\b\s*\w*\d*:"
  IgnoreStandardErrorWarningFormat="true"
  WorkingDirectory="$(SubSystemDir)">
  <Output TaskParameter="ExitCode" PropertyName="SQBuildWrapperExitCode" />
</Exec>

[robvdnieuw]

incorrectly closed the issue