This problem is reproducible by using compiz and attempting to switch to
a guest session. The welcome music and wallpaper appear, but the gnome-
panels do not. The command line can be accessed with Alt-F2. Ctrl-Alt-
Bksp kills the guest session and returns back to the original (locked)
session.

I have tried to obtain a backtrace, but as soon as I attach gdb to
compiz.real, my whole system freezes (except the mouse cursor). Even
Alt-Sysrq-K doesn't work. Any ideas on how I can obtain a backtrace are
appreciated.

** Changed in: compiz (Ubuntu)
       Status: Incomplete => Confirmed

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compiz.real crashed with SIGSEGV in paintOutput()
https://bugs.launchpad.net/bugs/269120
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