Failed in the following run:

http://dotnet-ci.cloudapp.net/job/dotnet_roslyn/job/master/job/windows_release_unit64/lastCompletedBuild/testReport/Microsoft.CodeAnalysis.UnitTests/SolutionTests/TestGetSyntaxRootDoesNotKeepRootAlive/

Assigning to @jasonmalinowski since he recently made changes in this area (feel free to reassign if this is not appropriate).