This problem is probably caused by 154_force-copykeyclass-for-key-
events.patch of xserver-xorg-core.

The patch adds
         ChangeDeviceID(mdev, *master);
to CopyKeyClass but doesn't check if master is valid. 
Master is NULL in the backtrace, so I guess it segfaults right there.

Luckily there is already a fresh upstream bug report assigned to the patch 
author:
http://bugs.freedesktop.org/show_bug.cgi?id=19222

-- 
[Jaunty] Pressing any key in onboard crashes xserver with SIGSEGV in 
CopyKeyClass
https://bugs.launchpad.net/bugs/309785
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