Thanks for attaching a full backtrace. Are you able to reproduce this
issue with Option "ExaNoComposite" "true" as well?
For reference, can you attach your /var/log/Xorg.0.log?
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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[hardy] Compositing + Xv causes SIGSEGV in memcpy()
https://bugs.launchpad.net/bugs/212799
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