Public bug reported:
Summary: Xwayland crashes with SIGABRT; Mutter hangs indefinitely
afterward, freezing the desktop
System: Ubuntu 26.04, GNOME Shell/Mutter (--mode=ubuntu), Intel UHD 630
(Coffee Lake, i915 driver)
Symptom: Desktop becomes completely unresponsive (mouse clicks, panel
menus, app launching all fail). gnome-shell process pegs one CPU core at
100%. SSH access to the machine remains functional during the freeze.
Root cause found via investigation: Xwayland crashes with signal 6
(SIGABRT). Confirmed via /var/crash/_usr_bin_Xwayland.1000.crash (Signal
file contains "6"). After Xwayland dies, GNOME Shell/Mutter's main
thread (confirmed via gdb backtrace on live process) is stuck in
_XReadEvents/XIfEvent inside libmutter, waiting indefinitely on the dead
Xwayland connection instead of detecting the disconnect and recovering.
journalctl excerpt at time of crash:
[paste the (EE) lines and "Connection to xwayland lost" lines here]
Crash file details:
~$ for f in Package SourcePackage DistroRelease Architecture Signal SignalName
ProcCmdline Date CurrentDesktop; do
echo "=== $f ==="
cat /tmp/xwayland-crash/$f 2>/dev/null
echo
done
=== Package ===
xwayland 2:24.1.10-1
=== SourcePackage ===
xwayland
=== DistroRelease ===
Ubuntu 26.04
=== Architecture ===
amd64
=== Signal ===
6
=== SignalName ===
SIGABRT
=== ProcCmdline ===
/usr/bin/Xwayland :0 -rootless -noreset -accessx -core -auth
/run/user/1000/.mutter-Xwaylandauth.KIK5S3 -listenfd 4 -listenfd 5 -displayfd 6
-initfd 7 -byteswappedclients -enable-ei-portal
=== Date ===
Sun Jul 26 07:15:50 2026
=== CurrentDesktop ===
ubuntu:GNOME
1) lsb_release -rd
Description: Ubuntu 26.04 LTS
Release: 26.04
2) No package name
3)Attempting to boot into Ubuntu desktop
4)'Frozen" desktop appeared - no mouse clicks, keyboard input or desktop icons
were available.
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2161835
Title:
On Ubuntu 26.04, Xwayland occasionally crashes
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2161835/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
