[Wayland-bugs] [Bug 108104] Atmel maXTouch Touchpad: kernel bug: Touch jump detected and discarded.

[b***@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108104

Bug ID: 108104
Summary: Atmel maXTouch Touchpad: kernel bug: Touch jump
detected and discarded.
Product: Wayland
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: XWayland
Assignee: wayland-***@lists.freedesktop.org
Reporter: ***@fraction.io
QA Contact: xorg-***@lists.x.org

Created attachment 141809
--> https://bugs.freedesktop.org/attachment.cgi?id=141809&action=edit
scroll.evemu file that triggers journalctl errors

I'm trying to resolve a desktop crash that seems to be triggered by scrolling
with my touchpad. Usually the touchpad scrolls fine, but once every few hours
it'll crash my desktop environment (GNOME Shell) and return me to my login
(GDM).

I found a core dump from GNOME Shell and opened an issue with more info:
https://gitlab.gnome.org/GNOME/mutter/issues/327

But it looks like I'm also seeing libinput errors and bug report request, so
I'm opening it here. Here are my local versions of everything related to
libinput and Wayland:

```
local/libinput 1.12.0-2
Input device management and event handling library
local/xf86-input-libinput 0.28.0-1 (xorg-drivers)
Generic input driver for the X.Org server based on libinput
local/egl-wayland 1.1.0-1
EGLStream-based Wayland external platform
local/libva 2.2.0-2
Video Acceleration (VA) API for Linux
local/wayland 1.16.0-1
A computer display server protocol
local/wayland-protocols 1.16-1
Specifications of extended Wayland protocols
local/wlc 0.0.11-1
Wayland Compositor Library
local/xorg-server-xwayland 1.20.1-1 (xorg)
run X clients under wayland
```

This crash is happening under both X.Org and Wayland. I've attached an .evemu
file as requested, please let me know if there's anything else I can do to
help. Thanks!

[b***@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108104

--- Comment #1 from ***@gmail.com ---
Created attachment 141826
--> https://bugs.freedesktop.org/attachment.cgi?id=141826&action=edit
Evemu recording which cases xWayland to crash due to an apparent libinput
issue.

[b***@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108104

--- Comment #2 from ***@gmail.com ---
I've also included an evemu recording which causes my machine to crash with the
same error reported in my Xorg log file. I tried running Christian's file but
it does not cause a crash on my machine.

Sysinfo:
Linux pigzal 4.14.71-1-MANJARO #1 SMP PREEMPT Thu Sep 20 05:29:20 UTC 2018
x86_64 GNU/Linux

Installed packages:
libinput 1.12.0-1.1
xf86-input-libinput 0.28.0-1
libva 2.2.0-2
wayland 1.16.0-1
wayland-protocols 1.16-1
xorg-server 1.20.1-1

I can also provide further information upon request.

[b***@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108104

--- Comment #3 from Christian Bundy <***@fraction.io> ---
(In reply to richjoerger from comment #2)

Post by b***@freedesktop.org
I've also included an evemu recording which causes my machine to crash with
the same error reported in my Xorg log file. I tried running Christian's
file but it does not cause a crash on my machine.

Sorry, I should've been more clear -- my file only triggers the errors
(warnings?) in `journalctl` but it doesn't cause a crash. Just tried your file
and I can verify that it worked perfectly: my desktop environment crashed and I
was returned to my login prompt. Thanks so much for including that file!

Is there a trick to triggering this bug, or did you just get lucky? Your
recording is so small, I was afraid I'd be recording for hours before I'd be
able to trigger a crash.

[b***@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108104

--- Comment #4 from ***@gmail.com ---
(In reply to Christian Bundy from comment #3)

Post by b***@freedesktop.org
(In reply to richjoerger from comment #2)

Post by b***@freedesktop.org
I've also included an evemu recording which causes my machine to crash with
the same error reported in my Xorg log file. I tried running Christian's
file but it does not cause a crash on my machine.

Sorry, I should've been more clear -- my file only triggers the errors
(warnings?) in `journalctl` but it doesn't cause a crash. Just tried your
file and I can verify that it worked perfectly: my desktop environment
crashed and I was returned to my login prompt. Thanks so much for including
that file!
Is there a trick to triggering this bug, or did you just get lucky? Your
recording is so small, I was afraid I'd be recording for hours before I'd be
able to trigger a crash.

If I recall correctly, the way I caused my crash was by two finger scrolling
quickly with my two fingers nearly vertical. It was initially a several minute
long recording in which I scrolled through web pages with my fingers in that
arrangement. Rather than subjecting anyone to that long of a file I just
trimmed down most of the instructions since they seem to not be important when
recreating the bug.