According to the stacktrace this happens as compiz is exiting. Can you
attach your /etc/X11/xorg.conf and ~/.xsession-errors files?
** Changed in: compiz (Ubuntu)
Status: New => Incomplete
** Visibility changed to: Public
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compiz.real crashed with SIGSEGV in _IceTransClose()
https://bugs.launchpad.net/bugs/192062
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