Unreproducible deadlock encountered while shutting down the NetBeans IDE running on JDK 6 b101 which seems to involve AWT code only. Looks to be a simple lock ordering bug.

"AWT-EventQueue-2":
  waiting for ownable synchronizer 0x82c367b0, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "AWT-XAWT"
"AWT-XAWT":
  waiting to lock monitor 0x083e6b44 (object 0x827a0148, a sun.awt.X11.XDialogPeer),
  which is held by "AWT-EventQueue-2"

See attachment for complete thread dump.