Deadlock using Windows native calls

My build locked up whilst calling hudson.Util.deleteContentsRecursive

deleteContentsRecursive calls hudson.util.jna.Kernel32Utils.isJunctionOrSymlink
isJunctionOrSymlink uses hudson.util.jna.Kernel32
Kernel32 uses com.sun.jna.Native
Native deadlocked at Native.java:122 in Native.<clinit> calling initIDs (Native method).

In another thread, hudson.node_monitors.SwapSpaceMonitor$MonitorTask.call was calling org.jvnet.hudson.Windows.monitor which then used com.sun.jna.Structure
Structure deadlocked at Structure.java:134 in Structure.<clinit>