execute() doesn't return

I've started working on an AdvancedRobot, and I find that sometimes the 
call to execute() just doesn't return. I've got an out.println() right 
after that which never prints. So far I haven't found a way to trigger it 
to happen. Other robots in the battle continue executing. onSkippedTurn() 
isn't being called. What I've asked it to do on the turn when it hangs is 
sometimes as simple as just a setTurnGunRight(20). Sometimes, when the next 
round begins, I see this printed:

java.lang.ThreadDeath
at java.lang.Thread.stop(Thread.java:758)
at 
net.sf.robocode.host.security.RobotThreadManager.stop(RobotThreadManager.java:189)
at 
net.sf.robocode.host.security.RobotThreadManager.stopSteps(RobotThreadManager.java:171)
at 
net.sf.robocode.host.security.RobotThreadManager.forceStop(RobotThreadManager.java:142)
at 
net.sf.robocode.host.security.RobotThreadManager.waitForStop(RobotThreadManager.java:127)
at 
net.sf.robocode.host.proxies.HostingRobotProxy.waitForStopThread(HostingRobotProxy.java:151)
at 
net.sf.robocode.host.proxies.BasicRobotProxy.waitForStopThread(BasicRobotProxy.java:43)
at net.sf.robocode.battle.peer.RobotPeer.waitForStop(RobotPeer.java:1670)
at net.sf.robocode.battle.Battle.finalizeRound(Battle.java:386)
at net.sf.robocode.battle.BaseBattle.run(BaseBattle.java:206)
at java.lang.Thread.run(Thread.java:662)
SYSTEM: This robot has been stopped.  No score will be generated.

I'm not starting any threads of my own, or doing any file/network I/O. 
Really it's nothing but some trig, not that complicated.

Any notions?

Version 1.9.0.0 Running on *Java 1.6.0_26 (64-bit)* by Sun Microsystems Inc.
on Ubuntu 13.10 64-bit



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