jdk1.6.0-ea-b47, Solaris10 u1 build 12 on both sparc and x86 platforms.

reproduce steps:
1. start mozilla
2. load url http://baseman.prc/jdk-applet-demo/1.4.2/demos/applets/eventmodel/actual/index.html
3. reload this page once or twice

result: mozilla hangs

From the result of jstack, we can see one deadlock is found. The result of jstack is in the attachment.