Public bug reported:
Since upgrading to Ubuntu 26.04, GNOME Shell (Wayland) crashes repeatedly when
using the touchscreen, which ends the whole session (back to login screen).
Happened 4 times within ~30 minutes on a Fujitsu LIFEBOOK T939 (convertible).
Steps:
1. Use the touchscreen to interact with apps (e.g. tap a
link/notification/dock
icon that activates another window)
2. gnome-shell segfaults, session is lost
Backtrace (symbolized via debuginfod):
#6 touch_can_grab_surface (touch_info=..., surface=...) at
../src/wayland/meta-wayland-touch.c:659
#7 meta_wayland_touch_find_grab_sequence (surface=..., serial=1221) at
../src/wayland/meta-wayland-touch.c:691
#8 meta_wayland_seat_get_grab_info (require_pressed=0) at
../src/wayland/meta-wayland-seat.c:609
#9 token_can_activate (token=...) at
../src/wayland/meta-wayland-activation.c:307
#10 maybe_activate (token_str="..._TIME0") at
../src/wayland/meta-wayland-activation.c:355
#11 activation_activate () at ../src/wayland/meta-wayland-activation.c:459
So an xdg_activation_v1.activate request whose token was created from a touch
event leads to an invalid touch_info access in touch_can_grab_surface().
Versions:
gnome-shell 50.1-0ubuntu1.3
mutter / libmutter-18-0 50.1-0ubuntu2.4
libinput10 1.31.1-1ubuntu1.2
Kernel 7.0.0-38-generic
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: mutter (not installed)
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 5 21:47:52 2026
InstallationDate: Installed on 2023-12-01 (1040 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64
(20220809.1)
ProcEnviron:
LANG=de_DE.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: mutter
UpgradeStatus: Upgraded to resolute on 2026-10-05 (0 days ago)
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2169630
Title:
gnome-shell crashed with SIGSEGV in touch_can_grab_surface() when
activating a window after touch input
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