Occasionally seeing warnings or errors building Asp.Net Core 2.1 projects

[nguerrera]

From @BillHiebert on April 12, 2018 15:42

Steps to reproduce

• From VS, create a new ASP.NET Core 2.1 Empty Web project
• Build

Expected behavior

Build succeeds

Actual behavior

Occasionally, the build will succeed but show the following warning:

Could not write state file "obj\Debug\netcoreapp1.1\App3.csprojAssemblyReference.cache". The process cannot access the file 'D:\dd\WTE\Rel\TestResults\Deploy_asplab 2018-04-11 14_56_42\Out\App3\App3\obj\Debug\netcoreapp1.1\App3.csprojAssemblyReference.cache' because it is being used by another process.

On one occasion I saw the following error:

1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018: The "ResolvePackageAssets" task failed unexpectedly.
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018: System.IO.IOException: The process cannot access the file 'C:\Users\billhie\Source\Repos\WebApplication87\WebApplication87\obj\Debug\netcoreapp2.1\WebApplication87.assets.cache' because it is being used by another process.
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter..ctor(ResolvePackageAssets task)
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute()
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
1>C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(205,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()
1>Done building project "WebApplication87.csproj" -- FAILED.

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
 Version:   2.1.300-preview2-008530
 Commit:    822ae6d43a

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.16299
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.1.300-preview2-008530\

Host (useful for support):
  Version: 2.1.0-preview2-26406-04
  Commit:  6833f3026b

.NET Core SDKs installed:
  1.0.4 [C:\Program Files\dotnet\sdk]
  1.1.7 [C:\Program Files\dotnet\sdk]
  1.1.8 [C:\Program Files\dotnet\sdk]
  2.0.0 [C:\Program Files\dotnet\sdk]
  2.1.100 [C:\Program Files\dotnet\sdk]
  2.1.200-preview-007474 [C:\Program Files\dotnet\sdk]
  2.1.200-preview-007480 [C:\Program Files\dotnet\sdk]
  2.1.200-preview-007509 [C:\Program Files\dotnet\sdk]
  2.1.300-preview1-008174 [C:\Program Files\dotnet\sdk]
  2.1.300-preview2-008530 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.0-preview1-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.0-preview2-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.0-preview1-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.0-preview2-final [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 1.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 1.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.0-preview1-26216-03 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.0-preview2-26406-04 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

Copied from original issue: dotnet/cli#9061

[nguerrera]

From @livarcocc on April 13, 2018 23:53

@nguerrera

[clguiman]

I'm also hitting this issue consistently when using the "dotnet store" command with the preview2 runtime. The same command worked just fine with preview1.

[nguerrera]

Using this bug to track the error case. The warning is tracked by dotnet/msbuild#3211

[nguerrera]

Fixed by #2159