This bug was fixed in the package mutter - 48.1-1ubuntu3.1
---------------
mutter (48.1-1ubuntu3.1) plucky; urgency=medium
[ Nathan Pratta Teodosio ]
* d/p/u/cursor-drag-and-drop.patch: Fixes cursor stuck in incorrect state
after attempt to drag and drop text inside the application's window.
https://bugzilla.mozilla.org/show_bug.cgi?id=1699942, LP: #2111502.
[ Alessandro Astone ]
* Fix crash seen when dismissing many notifications at once (LP: #2102063)
-- Daniel van Vugt <[email protected]> Mon, 09 Jun 2025
16:28:56 +0800
** Changed in: mutter (Ubuntu Plucky)
Status: Fix Committed => Fix Released
** Bug watch added: Mozilla Bugzilla #1699942
https://bugzilla.mozilla.org/show_bug.cgi?id=1699942
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https://bugs.launchpad.net/bugs/2102063
Title:
gnome-shell crashed with SIGSEGV in
_cogl_pipeline_layer_numbers_equal() from
compare_entry_layer_numbers()
Status in Mutter:
Fix Released
Status in mutter package in Ubuntu:
Fix Committed
Status in mutter source package in Plucky:
Fix Released
Status in mutter source package in Questing:
Fix Committed
Bug description:
[ Impact ]
If many notifications have accumulated, GNOME Shell will crash and log
out the user when clicking the "Clear" button to dismiss all
notifications.
The root cause of the bug is a classic case of removing elements from
a linked-list while iterating over it unsafely, during the composition
rendering pass.
[ Test plan ]
1. Spawn many notifications:
$ for run in {1..20}; do notify-send foo; done
2. Open the calendar menu
3. Click "Clear"
4. Verify that all notifications were dismissed
5. Verify that GNOME Shell did not crash and log you out
[ Where problems could occur ]
mutter is the component of GNOME driving the screen and inputs, and
thus is a critical component of Ubuntu Desktop.
Problems would manifest with the desktop rendering incorrectly or
crashing.
The side-effects being very evident and the patch being trivial make
this upload a low risk for regressions.
[ Other information ]
The Ubuntu Error Tracker has been receiving reports about a problem regarding
gnome-shell. This problem was most recently seen with package version
48~beta-3ubuntu1, the problem page at
https://errors.ubuntu.com/problem/c840a93998fc1f3edb39a0c0ed8682215c9e5f63
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/mutter/+bug/2102063/+subscriptions
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