Detect UIFreeze and Blank screen

Hi Linaro/Android/Dev's ,

I am running few Graphics benchmark tests on a Pandaboard. Recently after few changes in Overlay layer i am seeing UI is getting freeze randomly and sometime it is showing black screen even though shell is able to access. If i launch any activity through am, UI is not getting updated and it needs a hard reboot. It is very hard to debug the root cause.

How to stop any test/benchmark if the UI freeze or a blank screen. Is there any way to do it from kernel or userspace. Any available tool that detects similar issue.