Comment 58 for bug 1021517

stacktrace:

#0 0x006408d0 in ActivateKeyboardGrab (keybd=0x23fa83e8, grab=0x243b3a50, time=..., passive=0) at ../../dix/events.c:1616
#1 0x00639a18 in GrabDevice (client=0x242a6940, dev=0x23fa83e8, pointer_mode=1, keyboard_mode=1, grabWindow=58726424, ownerEvents=0, ctime=372854, mask=0xbfd3182c,
    grabtype=1, curs=0, confineToWin=0, status=0xbfd31810 "") at ../../dix/events.c:5264
#2 0x0071300c in ProcXGrabDevice (client=0x242a6940) at ../../Xi/grabdev.c:132
#3 0x0070f0c7 in ProcIDispatch (client=0x242a6940) at ../../Xi/extinit.c:415
#4 0x0062f9dd in Dispatch () at ../../dix/dispatch.c:442
#5 0x0061d36a in main (argc=8, argv=0xbfd319c4, envp=0xbfd319e8) at ../../dix/main.c:288

it's trivial to get here by running gimp, opening an image and doing "gsettings set org.gnome.settings-daemon.peripherals.touchpad touchpad-enabled false"