This issue was seen with awt tests on a couple of Solaris systems - one is a solaris-sparc system and another is solaris-x86. On solaris-sparc, it wasn't consistently reproducible. Attached is a testcase used to reproduce the issue.

The testcase consists of two threads - one which waits for a certain duration before timing out and the other thread does some ui operations. It is seen that the first thread times out before the specified duration is elapsed - without any exceptions.