Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: mutter (Ubuntu Noble)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2069564
Title:
[SRU] gnome-shell crashed with SIGTRAP in
meta_wayland_compositor_new() from meta_context_start() from main()
["Failed to start X Wayland: Directory \"/tmp/.X11-unix\" is not
writable"]
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Noble:
Confirmed
Status in mutter source package in Oracular:
Won't Fix
Status in mutter source package in Plucky:
Fix Released
Bug description:
If you are hitting this bug, please write your case in
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3984.
[Impact]
This causes one of the top Gnome-Shell crashes as caught by Ubuntu
error tracker.
It happens when /tmp/.X11-unix is accessible by the user but does not
pass a stricter permission check Mutter makes.
In the typical Ubuntu setup, both /tmp and /tmp/.X11-unix are
root:root rwxrwxrwt, so it passes that stricter permission check.
[Test case]
1. Stop GDM:
systemctl stop gdm
This will bring you to the virtual console (i.e. without a graphical
environment, only command-line).
2. Install mutter, gir1.2-mutter-15, libmutter-15-0, mutter-common,
mutter-common-bin from proposed (the exact steps to enable proposed
are laid down by the SRU bot comment to this bug).
3. Execute:
chmod 1007 /tmp/.X11-unix
4. Execute:
MUTTER_DEBUG=all G_DEBUG=1 dbus-run-session -- gnome-shell
--display-server --wayland &>log
Gnome-Shell must start and Mutter (you can look for them in 'ps aux'
output if you are not acquainted with the looks of those pieces of
software).
5. Now open xterm and kill the graphical environment by executing:
pkill wayland
Verify that there are no mentions of the issue directory in the log,
i.e. 'grep X11-unix log' returns nothing.
[Where problems could occur]
In Mutter or Gnome-Shell, particularly at launch phase. Also make sure
Xorg applications behave normally (that's why xterm is included in
test case), without failing to open or delays.
---------------
The Ubuntu Error Tracker has been receiving reports about a problem regarding
gnome-shell. This problem was most recently seen with package version
46.0-0ubuntu5.1, the problem page at
https://errors.ubuntu.com/problem/a7dbd55723a8ea326d1ccf32e31fe307151786c2
contains more details, including versions of packages affected, stacktrace or
traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software
developer, you can request it at http://forms.canonical.com/reports/.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2069564/+subscriptions
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