Maybe you could run top and notice what program is using the CPU, then attach is with "gdb -p $(pidof program)" and get a backtrace with "thread apply all bt"?
** Changed in: gnome-panel (Ubuntu)
Assignee: (unassigned) => Ubuntu Desktop Bugs
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Gnome window list causes gnome-panel to eat all CPU
https://launchpad.net/bugs/56289
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