Seems pretty clear to be a null pointer dereference:
pEvdev = (EvdevPtr) 0x0
probably at this point:
if (pEvdev->emulateMB.pending)
The attached patch should paper over this particular crash.
** Attachment added: "100_mbemu_nullptr.patch"
http://launchpadlibrarian.net/29729915/100_mbemu_nullptr.patch
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Xorg crashed with SIGSEGV in EvdevMBEmuBlockHandler()
https://bugs.launchpad.net/bugs/343528
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