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DescriptionMichael Boisvert
2017-06-02 16:37:44 UTC
Description of problem: Using the stylus while mapping buttons on a screen tablet causes Xorg to crash and return to GDM.
How reproducible: Only under a specific circumstance.
Steps to Reproduce:
1. Connect screen tablet to a laptop then boot GNOME, do not use the stylus on the tablet until #4.
2. The screen tablet should be setup as a secondary monitor by default.
3. Before using the stylus on the tablet, navigate to Wacom Settings using the mouse and select map buttons for the screen tablet.
4. Press the button on the tablet you want to map, then try to use the stylus on the screen tablet to complete the button mapping.
5. Xorg will crash and return you to the login screen within 5 seconds.
Actual results: The stylus can be used to select button mapping options at any time.
Expected results: You can use the stylus for the first time to map a button on the tablet.
Additional info: Error occurs on all screen tablets I tested. The issue did not happen when you plug the tablet in AFTER logging into GNOME or when you use the stylus on the screen at some point before trying to map buttons.
Created attachment 1285990[details]
backtrace from the crash
Managed to reproduce it here with an Intuos 4, assigned to a single screen via the gnome control center, with one button on the pad assigned to "Switch Monitor".
If I press the switch-monitor button, then go into proximity with the stylus and move to the edge of the screen, it crashes. Or if the stylus is in proximity when the button is pressed. On the x input device itself, all that changes is the coordinate transformation matrix; changing that one manually does not reproduce the crash.
A second reproducer is assigning a button to "Show On-screen Help", then toggling this on/off while moving the stylus in/out of proximity. Not sure what the exact sequence is, eventually it crashes.
Either way, the crash is definitely in the X server. In both cases the OSD is involved and the crash is related to a NULL cursor.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2017:1905