The process cannot access the file 'blazor-brotli.dll'

[BrennanConroy]

Build flakiness:

  Microsoft.AspNetCore.Components.WebAssembly.Build -> /Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Build/src/bin/Release/net46/Microsoft.AspNetCore.Components.WebAssembly.Build.Tasks.dll
  Microsoft.AspNetCore.Components.Forms -> /Users/runner/runners/2.170.1/work/1/s/src/Components/Forms/src/bin/Release/netstandard2.0/Microsoft.AspNetCore.Components.Forms.dll
  Microsoft.Extensions.Configuration.KeyPerFile -> /Users/runner/runners/2.170.1/work/1/s/artifacts/bin/Microsoft.Extensions.Configuration.KeyPerFile-ref/Release/netstandard2.0/Microsoft.Extensions.Configuration.KeyPerFile.dll
  Internal.AspNetCore.Analyzers -> /Users/runner/runners/2.170.1/work/1/s/artifacts/bin/Internal.AspNetCore.Analyzers/Release/netstandard1.3/Internal.AspNetCore.Analyzers.dll
  Microsoft.Extensions.Localization -> /Users/runner/runners/2.170.1/work/1/s/artifacts/bin/Microsoft.Extensions.Localization/Release/net5.0/Microsoft.Extensions.Localization.dll
  Microsoft.Extensions.Configuration.KeyPerFile -> /Users/runner/runners/2.170.1/work/1/s/artifacts/bin/Microsoft.Extensions.Configuration.KeyPerFile/Release/net5.0/Microsoft.Extensions.Configuration.KeyPerFile.dll
  Microsoft.JSInterop -> /Users/runner/runners/2.170.1/work/1/s/artifacts/bin/Microsoft.JSInterop-ref/Release/netstandard2.0/Microsoft.JSInterop.dll
/Users/runner/runners/2.170.1/work/1/s/.dotnet/sdk/5.0.100-preview.6.20310.4/Microsoft.Common.CurrentVersion.targets(4187,5): error MSB3026: Could not copy "obj/Release/net5.0/blazor-brotli.dll" to "bin/Release/net5.0/blazor-brotli.dll". Beginning retry 1 in 1000ms. The process cannot access the file '/Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/obj/Release/net5.0/blazor-brotli.dll' because it is being used by another process.  [/Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/Microsoft.AspNetCore.Components.WebAssembly.Build.BrotliCompression.csproj]
##[error].dotnet/sdk/5.0.100-preview.6.20310.4/Microsoft.Common.CurrentVersion.targets(4187,5): error MSB3026: (NETCORE_ENGINEERING_TELEMETRY=Build) Could not copy "obj/Release/net5.0/blazor-brotli.dll" to "bin/Release/net5.0/blazor-brotli.dll". Beginning retry 1 in 1000ms. The process cannot access the file '/Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/obj/Release/net5.0/blazor-brotli.dll' because it is being used by another process. 
/Users/runner/runners/2.170.1/work/1/s/.dotnet/sdk/5.0.100-preview.6.20310.4/Microsoft.Common.CurrentVersion.targets(4187,5): error MSB3026: Could not copy "obj/Release/net5.0/blazor-brotli.dll" to "bin/Release/net5.0/blazor-brotli.dll". Beginning retry 1 in 1000ms. The process cannot access the file '/Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/obj/Release/net5.0/blazor-brotli.dll' because it is being used by another process.  [/Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/Microsoft.AspNetCore.Components.WebAssembly.Build.BrotliCompression.csproj]
##[error].dotnet/sdk/5.0.100-preview.6.20310.4/Microsoft.Common.CurrentVersion.targets(4187,5): error MSB3026: (NETCORE_ENGINEERING_TELEMETRY=Build) Could not copy "obj/Release/net5.0/blazor-brotli.dll" to "bin/Release/net5.0/blazor-brotli.dll". Beginning retry 1 in 1000ms. The process cannot access the file '/Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/obj/Release/net5.0/blazor-brotli.dll' because it is being used by another process. 
  Microsoft.AspNetCore.Components.WebAssembly.Build.BrotliCompression -> /Users/runner/runners/2.170.1/work/1/s/src/Components/WebAssembly/Compression/src/bin/Release/net5.0/blazor-brotli.dll
  Microsoft.Extensions.ObjectPool -> /Users/runner/runners/2.170.1/work/1/s/artifacts/bin/Microsoft.Extensions.ObjectPool-ref/Release/netstandard2.0/Microsoft.Extensions.ObjectPool.dll

[javiercn]

Thanks @BrennanConroy

@pranavkm can you take a look at it? Will this go away with your current changes?

[javiercn]

@pranavkm I assigned this to you because I'm 99% sure this will go away with your changes.

[pranavkm]

We fixed file contention issues with rzc recently. Brotli's part of it, so this should likely be resolved. Closing this, feel free to reopen if you continue seeing this.