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On some random condition, a touch event may trigger a crash in Xwayland in GetTouchEvents(). The (simplified) backtrace goes as follow: (gdb) bt #0 GetTouchEvents() at getevents.c:1892 #1 QueueTouchEvents() at getevents.c:1866 #2 xwl_touch_send_event() at xwayland-input.c:652 #5 wl_closure_invoke() from libwayland-client.so.0 #6 dispatch_event() from libwayland-client.so.0 #7 wl_display_dispatch_queue_pending() from libwayland-client.so.0 #8 xwl_read_events() at xwayland.c:483 #9 ospoll_wait() at ospoll.c:412 #10 WaitForSomething() at WaitFor.c:222 #11 Dispatch() at dispatch.c:412 #12 dix_main() at main.c:287 #13 __libc_start_main() at libc-start.c:289 #14 _start () The crash occurs when trying to access the sprite associated with the touch device, which appears to be NULL. Reason being the device itself is more a keyboard device than a touch device. Moreover, it appears the device is neither enabled nor activated (inited=0, enabled=0) which doesn't seem right, but matches the code in init_touch() from xwayland-input.c which would enable the device if it was previously existing and otherwise would create the device but not activate it. Make sure we do activate and enable touch devices just like we do for other input devices such as keyboard and pointer. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
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http://en.wikipedia.org/wiki/X_server
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