Yes, it does seem to be a crash in the input subsystem.
As to the core file, X isn't set to dump core by default; you'd have to
flip that on.
Since you're able to reproduce this crash fairly at-will, I would
actually suggest instead of bothering with the core to just run X inside
gdb, let it crash, and then grab a full backtrace. Don't forget to
install symbol packages (i.e. the various -dbg packages).
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/936893
Title:
xorg segfaults with multiseat configuration
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