I have installed gnome-shell 46.0-0ubuntu6~24.04.4 on Noble and cannot
reproduce the crash using the test case described at the top of this
bug. However as mentioned in previous comments, this crash is refusing
to happen on demand, even without the fix.

Since we are still getting automated crash reports for this issue;

https://errors.ubuntu.com/problem/65513baf83b5ba140d09c2aa71b988097108cde0

I suggest we release the fix and the above page will provide the final
word in whether the crash is gone for good.


** Tags removed: verification-needed-noble
** Tags added: verification-done-noble

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https://bugs.launchpad.net/bugs/2069559

Title:
  gnome-shell crashed with SIGSEGV in st_theme_node_lookup_shadow() from
  st_theme_node_get_box_shadow() from st_theme_node_get_paint_box() from
  st_theme_node_transition_get_paint_box() from
  st_widget_get_paint_volume()

Status in Dash to dock:
  Fix Released
Status in GNOME Shell:
  New
Status in gnome-shell package in Ubuntu:
  Fix Released
Status in gnome-shell source package in Noble:
  Fix Committed
Status in gnome-shell source package in Oracular:
  Fix Released

Bug description:
  [ Impact ]

  gnome-shell crashes with SIGSEGV in st_theme_node_lookup_shadow() when
  the screen is locked from the overview, if you had any extension
  loaded that changes stylesheets (like ubuntu-dock or dash-to-dock). In
  theory it could happen whenever such an extension is deactivated.

  https://errors.ubuntu.com/problem/65513baf83b5ba140d09c2aa71b988097108cde0
  https://errors.ubuntu.com/problem/9e0eb2f488ad83e41a8977709955a661857ba95e

  [ Test Plan ]

  1. Log into gnome-shell.
  2. Ensure Ubuntu Dock is active.
  3. Open the overview by tapping the Super key.
  4. Lock the screen while the overview is open.

  Expect: No crash, no automatic return to the login screen. The screen
  should lock and then be unlockable.

  Note: It doesn't crash reliably every time due to the nature of memory
  corruption so additional verification under Valgrind may be advisable.

  [ Where problems could occur ]

  Since the fix affects theming and stylesheets, bugs could occur in
  shell theming.

  [ Original description ]

  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/65513baf83b5ba140d09c2aa71b988097108cde0 
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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