ScalaReflectionLock.synchronized can cause deadlock

Just a heads up, i was doing some basic coding using DataFrame, Row, StructType, etc. in my own project and i ended up with deadlocks in my sbt tests due to the usage of ScalaReflectionLock.synchronized in the spark sql code.
the issue went away when i changed my build to have:
parallelExecution in Test := false
so that the tests run consecutively...