ktrace UHCI controller

[Fahnmusa C Jangaba]

hi

I am running freebsd 6.1 and I am trying to use ktrace to see why the uhci0
controller process stops responding to usb events. I am use ktrace with the
-p option to attach to a process and also with all trace points turned on.
I  don't see any calls in the file ktrace.out file . Am i using ktrace
wrong or is there another way to trace what the uhci0 process is doing and
find out why it is stuck.

thanks

Fahnmusa