This bug was fixed in the package mutter - 3.30.2-1~ubuntu18.10.3

---------------
mutter (3.30.2-1~ubuntu18.10.3) cosmic; urgency=medium

  * d/p/clutter-Avoid-rounding-compensation-when-invalidating-2D-.patch,
    d/p/clutter-Fix-offscreen-effect-painting-of-clones.patch:
    - Fix offscreen-effect painting of clones in zoom mode (LP: #1767648,
      LP: #1779615)
  * d/p/cogl-auto-texture-Avoid-a-double-free-crash.patch,
    d/p/clutter-offscreen-effect-Disable-if-no-texture.patch:
    - Fix crash in dual monitor setup and gdm activation (LP: #1790525,
      LP: #1795774)

 -- Marco Trevisan (Treviño) <[email protected]>  Fri, 25 Jan 2019
11:09:33 +0000

** Changed in: mutter (Ubuntu Cosmic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1795774

Title:
  gnome-shell crashed with SIGSEGV in
  cogl_texture_get_height(texture=0x0) from
  clutter_offscreen_effect_real_paint_target() from
  clutter_offscreen_effect_paint_texture() from
  clutter_offscreen_effect_paint() from clutter_actor_continue_paint()

Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Bionic:
  In Progress
Status in mutter source package in Cosmic:
  Fix Released

Bug description:
  [ Impact ]

  Gnome shell crashes on cogl_texture_get_height

  [ Test case ]

  No clear reproducer is know for such issue, crashes should be
  monitored in e.u.c checking that this is not happening anymore for the
  version in proposed.

  [ Regression potential ]

  Low, the proposed fix is part of the current stable branch upstream
  and not changed in further revisions.

  --

  The Ubuntu Error Tracker has been receiving reports about a problem regarding 
gnome-shell.  This problem was most recently seen with package version 
3.30.0-1ubuntu2, the problem page at 
https://errors.ubuntu.com/problem/e5b2dcb04552882a76f1daa6b9f18ba864269d26 
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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