MSBuild on Jenkins WIN node fails "randomly" with MSB3021 error.

[gowindu123]

Hello Team,

We are facing the issue of build failure due to MSB3021

We have checked for file locks (like Anti Virus and others) but could notice no process is blocking the files.

After referring the discussions: we have tried setting

set MSBUILDALWAYSRETRY=1

The command that we are invoking for the build is:
"C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Current\Bin\msbuild" ***********.sln /t:Rebuild /p:Configuration=Release /p:Platform="Any CPU" /nodeReuse:false /verbosity:minimal /p:PrecompileBeforePublish=false /p:OutDir=build /p:DeployTarget=Package /p:DebugType=None /p:DeployOnBuild=true /p:SkipInvalidConfigurations=true /p:PackageAsSingleFile=false /p:AspNetCompileMerge=true /p:RunCodeAnalysis=false /p:WarnAsError=false /nowarn:MSB3247,MSB3277,MSB3021
MSBuild version 17.7.2+d6990bcfa for .NET Framework

The error we get is :
error MSB3021: Unable to copy file *********.dll" to .dll". Access to the path '.dll' is denied.
[ and this is happening randomly for different dlls in different runs .

We are using VS2022 build toolkit for the solution build and the application is framework application v4.8

Please help on this as it is heavily affecting out CI builds

[KalleOlaviNiemitalo]

We have checked for file locks (like Anti Virus and others) but could notice no process is blocking the files.

Did you check during the build, or after the build?

[gowindu123]

We have checked during the build and found no files have been impacted

[gowindu123]

the process is ending abruptly with the MSB3021 error though no file is being locked

[GangWang01]

@gowindu123 the single error message could not help us understand if the copy task with retries worked or not with setting set MSBUILDALWAYSRETRY=1. Can you share more detailed build output?
And it sounds like you are able to check files' status when the issue is happening. Can you refer to #9169 (comment) to provide process monitor log while the issue is happening? It can help us a lot understand why access to the file is denied. It's great if you can provide the binary log for the investigation. But before sharing binary log be aware that binary log may capture sensitive information.