The title says it all, I haven't noticed any particular patterns/triggers yet.
Gist of the crash dump and output from java -version:
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode)
Anything else?