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

-- 
Xorg crashed with SIGSEGV in EvdevMBEmuBlockHandler()
https://bugs.launchpad.net/bugs/343528
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