Comment 13 for bug 1751086

I can trigger this reliably with my thinkpad X1 5th gen on bionic's xorg:
Mar 20 11:08:19 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (II) Axis 0x35 value 0 is outside expected range [1045, 5896]
Mar 20 11:08:19 nsnx /usr/lib/gdm3/gdm-x-session[16817]: See https://wayland.freedesktop.org/libinput/doc/1.10.1//absolute_coordinate_ranges.html for details
Mar 20 11:08:19 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) event5 - SynPS/2 Synaptics TouchPad: libinput bug: invalid tap event TAP_EVENT_PALM in state TAP_STATE_TAPPED
Mar 20 11:08:19 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) event5 - SynPS/2 Synaptics TouchPad: libinput bug: invalid tap event TAP_EVENT_PALM in state TAP_STATE_TAPPED
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: Xorg: ../src/evdev-mt-touchpad-tap.c:1002: tp_tap_handle_state: Assertion `tp->tap.nfingers_down > 0' failed.
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE)
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) Backtrace:
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4d) [0x565247c457fd]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 1: /usr/lib/xorg/Xorg (0x565247a8d000+0x1bc599) [0x565247c49599]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f28775c1000+0x12890) [0x7f28775d3890]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xc7) [0x7f287720ee97]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x141) [0x7f2877210801]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (0x7f28771d0000+0x3039a) [0x7f287720039a]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (0x7f28771d0000+0x30412) [0x7f2877200412]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 7: /usr/lib/x86_64-linux-gnu/libinput.so.10 (0x7f28741aa000+0x1da40) [0x7f28741c7a40]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 8: /usr/lib/x86_64-linux-gnu/libinput.so.10 (0x7f28741aa000+0x18e17) [0x7f28741c2e17]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 9: /usr/lib/x86_64-linux-gnu/libinput.so.10 (0x7f28741aa000+0x1ad90) [0x7f28741c4d90]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 10: /usr/lib/x86_64-linux-gnu/libinput.so.10 (0x7f28741aa000+0xf5e1) [0x7f28741b95e1]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 11: /usr/lib/x86_64-linux-gnu/libinput.so.10 (libinput_dispatch+0x5f) [0x7f28741b560f]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 12: /usr/lib/xorg/modules/input/libinput_drv.so (0x7f28743fa000+0x8988) [0x7f2874402988]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 13: /usr/lib/xorg/Xorg (0x565247a8d000+0x1ba973) [0x565247c47973]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 14: /usr/lib/xorg/Xorg (0x565247a8d000+0x1bd071) [0x565247c4a071]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 15: /usr/lib/xorg/Xorg (0x565247a8d000+0x1ba7be) [0x565247c477be]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 16: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f28775c1000+0x76db) [0x7f28775c86db]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) 17: /lib/x86_64-linux-gnu/libc.so.6 (clone+0x3f) [0x7f28772f188f]
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE)
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE)
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: Fatal server error:
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) Caught signal 6 (Aborted). Server aborting
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE)
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE)
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: Please consult the The X.Org Foundation support
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: #011 at http://wiki.x.org
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: for help.
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) Please also check the log file at "/home/andreas/.local/share/xorg/Xorg.0.log" for additional information.
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE)
Mar 20 11:08:29 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (II) AIGLX: Suspending AIGLX clients for VT switch
Mar 20 11:08:30 nsnx /usr/lib/gdm3/gdm-x-session[16817]: (EE) Server terminated with error (1). Closing log file.

All I need to do is swipe my palm from left to right over the touchpad.