The assertion being triggered here is in
mutter-3.12.2/src/core/display.c:

      switch (input_event->evtype)
        {
          …
        case XI_TouchUpdate:
        case XI_TouchEnd:
          /* Filter out non-pointer-emulating touches */
          if ((((XIDeviceEvent *) input_event)->flags & 
XITouchEmulatingPointer) == 0)
            break;

          /* Currently unhandled, if any grab_op is started through 
XI_TouchBegin,
           * the XIGrabDevice() evmask drops touch events, so only emulated
           * XI_Motions and XI_ButtonRelease will follow.
           */
          g_assert_not_reached ();
          break;
        }


** Also affects: mutter (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1406150

Title:
  gnome-shell crashed with SIGABRT in g_assertion_message()

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