Flaky Build: MSB3027 Could not copy

[mikeharder]

The PackageCache build occasionally fails with the following error. It usually succeeds after a rebuild, so this appears to be a race condition in the CrossGen build.

[Step 1/2] C:\b\w\33bf2c3795c96c7d\.dotnet\sdk\2.0.0-preview2-006479\Sdks\Microsoft.NET.Sdk\build\Microsoft.NET.CrossGen.targets(180,5):
error MSB3027: Could not copy "C:\b\w\33bf2c3795c96c7d\.rw\Build.RuntimeStore.References_2.0.0-preview2-25769\runtimesymbols\
microsoft.identitymodel.clients.activedirectory\3.13.9\lib\netstandard1.4\Microsoft.IdentityModel.Clients.ActiveDirectory.ni.dll"
to "C:\b\w\33bf2c3795c96c7d\.rw\SymbolsStagingDir\microsoft.identitymodel.clients.activedirectory\
3.13.9\lib\netstandard1.4\Microsoft.IdentityModel.Clients.ActiveDirectory.ni.dll".
Exceeded retry count of 10. Failed.
[C:\b\w\33bf2c3795c96c7d\src\Microsoft.AspNetCore.RuntimeStore\Microsoft.AspNetCore.RuntimeStore.csproj] 
[C:\b\w\33bf2c3795c96c7d\.build\KoreBuild.proj]

http://aspnetci/viewLog.html?buildId=243268&buildTypeId=Coherence_CoherencePackageCacheWin&tab=buildLog#_focus=2975

[JunTaoLuo]

We should also file the issue in https://github.com/dotnet/sdk/issues

[JunTaoLuo]

filed dotnet/sdk#1380

[muratg]

I don't see any activity on the SDK bug. Is this still an issue we're having?

[JunTaoLuo]

Yes, we need to bump the issue so it gets more attention.

[Eilon]

No runtime store anymore.