Public bug reported:
[ Impact ]
GTK4 applications using the X11 backend will crash when attaching a physical
touch device to a different logical master device in the XInput hierarchy.
This usually requires manual configuring from a terminal, and would not be
affecting the average user.
[ Test plan ]
1. Set up a touchscreen device
2. Log-in to Ubuntu (on Xorg)
3. Launch Files, Settings and Text Editor (GTK4 apps)
4. From a terminal, run:
xinput list
and annotate the "id" of the physical touch device, for example:
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ xwayland-touch:15 id=10 [slave pointer (2)]
would be id 10
5. From a terminal, run:
xinput create-master Touch
xinput reattach <id> "Touch pointer"
6. Verify that all GTK4 applications did not crash
7. Verify that all GTK4 applications are still responsive to touch input
[ Where problems could occur ]
The patch only impacts a piece of logic reachable on:
* X11 only
* Touchscreen only
* Processing a re-attach event
Because this previously caused a crashed, no regressions are to be expected. We
are only resolving the crash.
[ Other info ]
The bug was introduced in a downstream patch fixing bug 2119066, applied
to noble only. The same patch is now also being applied to resolute, but
already including this crash fix.
** Affects: gtk4 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: gtk4 (Ubuntu Noble)
Importance: Low
Assignee: Alessandro Astone (aleasto)
Status: In Progress
** Affects: gtk4 (Ubuntu Resolute)
Importance: Undecided
Status: Invalid
** Tags: noble
** Also affects: gtk4 (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: gtk4 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: gtk4 (Ubuntu Resolute)
Status: New => Invalid
** Changed in: gtk4 (Ubuntu Noble)
Status: New => In Progress
** Changed in: gtk4 (Ubuntu Noble)
Assignee: (unassigned) => Alessandro Astone (aleasto)
** Changed in: gtk4 (Ubuntu Noble)
Importance: Undecided => Low
** Tags added: noble
** Description changed:
[ Impact ]
GTK4 applications using the X11 backend will crash when attaching a physical
touch device to a different logical master device in the XInput hierarchy.
This usually requires manual configuring from a terminal, and would not be
affecting the average user.
[ Test plan ]
1. Set up a touchscreen device
2. Log-in to Ubuntu (on Xorg)
3. Launch Files, Settings and Text Editor (GTK4 apps)
4. From a terminal, run:
- xinput list
+ xinput list
- and annotate the "id" of the physical touch device, for example:
- $ xinput list
- ⎡ Virtual core pointer id=2 [master pointer
(3)]
- ⎜ ↳ xwayland-touch:15 id=10 [slave pointer
(2)]
+ and annotate the "id" of the physical touch device, for example:
+ $ xinput list
+ ⎡ Virtual core pointer id=2 [master pointer
(3)]
+ ⎜ ↳ xwayland-touch:15 id=10 [slave pointer
(2)]
- would be id 10
+ would be id 10
5. From a terminal, run:
- xinput create-master Touch
- xinput reattach <id> "Touch pointer"
+ xinput create-master Touch
+ xinput reattach <id> "Touch pointer"
6. Verify that all GTK4 applications did not crash
7. Verify that all GTK4 applications are still responsive to touch input
[ Where problems could occur ]
The patch only impacts a piece of logic reachable on:
* X11 only
* Touchscreen only
* Processing a re-attach event
Because this previously caused a crashed, no regressions are to be expected.
We are only resolving the crash.
+
+ [ Other info ]
+
+ The bug was introduced in a downstream patch fixing bug 2119066, applied
+ to noble only. The same patch is now also being applied to resolute, but
+ already including this crash fix.
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https://bugs.launchpad.net/bugs/2144632
Title:
GTK4 X11 applications crash when reattaching touch device
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