https://bugs.freedesktop.org/show_bug.cgi?id=105370

            Bug ID: 105370
           Summary: Dragging the palm across touchpad crashes : Assertion
                    `tp->tap.nfingers_down >= 1' failed.
           Product: Wayland
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs@lists.freedesktop.org
          Reporter: quantumphoton...@gmail.com

Created attachment 137829
  --> https://bugs.freedesktop.org/attachment.cgi?id=137829&action=edit
Stacktrace of crash

I dragged my palm across the touchpad and X crashed. I have attached what X
printed as `err.log`. Simply stating,
`../libinput-1.10.1/src/evdev-mt-touchpad-tap.c:1028: tp_tap_handle_state:
Assertion `tp->tap.nfingers_down >= 1' failed`. 

The weird thing is, when I `modprobe psmouse synaptics_intertouch=1`, this
crash doesn't occur however weird I try dragging my palm across the touchpad.
But on unloading and `modprobe psmouse synaptics_intertouch=0` and then
dragging my palm across, this crash happens.

$ udevadm info /sys/class/input/event16
P: /devices/rmi4-00/input/input18/event16
N: input/event16
E: DEVNAME=/dev/input/event16
E: DEVPATH=/devices/rmi4-00/input/input18/event16
E: ID_BUS=rmi
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=53
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=98
E: ID_SERIAL=noserial
E: LIBINPUT_DEVICE_GROUP=1d/6cb/0:rmi4-00
E: MAJOR=13
E: MINOR=80
E: SUBSYSTEM=input
E: USEC_INITIALIZED=15414239

$ libinput --version
1.10.1

Vendor : Dell Inspiron 3537
$ cat /sys/class/dmi/id/modalias 
dmi:bvnDellInc.:bvrA09:bd08/25/2016:svnDellInc.:pnInspiron3537:pvrA09:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvrA09:

Physical Dimension of touchpad (the actual area, without including buttons)
Width = 10.8 cm
Height = 6.1 cm

The touchpad has two physical buttons (L, R)

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