I have some users running 1.5 Java VMs. They run for a bit. Then seem to get 'locked up'.

The process maxes out the UML CPU. They do not respond to a kill -3 (which normally causes a Java stack trace to be output). The process does not output anything when I strace it (after it locks up).

This happens when the 1.5 JDK is used to start Tomcat. And it has happened running other Java apps as well. I don't see the problem with any non-Java apps. The problem also happens with the Update 1 release of the 1.5 JDK.

I never see the problem with the 'old' 1.4.* releases. I don't see any reports like this with JDK 1.5 users on non-UML systems.

So I'm guessing there is a UML/JD1.5 interaction issue here somewhere.

Is anyone else seeing this issue? And can someone give me an idea of how to collect more information about this problem. Oh, and wild guesses at the cause of the problem are also invited :)

Regards, Peter


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