** Description changed:
- 1. Have many notifications accumulate in the menu
- 2. Open the calendar menu and clear all notifications
+ [ 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/.
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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()
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