Gnome Shell froze GUI entirely with 100% CPU usage

[hackel]

Without warning or apparent user action, my entire system froze aside from the mouse cursor. I was able to switch to a VT to log in and capture this bug report. After that, I had to `kill -9 gnome-shell` after which it restarted properly and my session is now working fine again.

Possibly a dupe of #1709597 but that is quite old.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.30.2-0ubuntu1.18.10.1
Uname: Linux 5.0.1-050001-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Mar 25 17:31:56 2019
DisplayManager: gdm3
ExecutablePath: /usr/bin/gnome-shell
InstallationDate: Installed on 2017-12-09 (470 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to cosmic on 2018-10-19 (157 days ago)

[Daniel van Vugt (vanvugt)]

Please:

1. Remove all your extensions since extensions tend to cause most of the bugs like this one...

b'org.gnome.shell' b'enabled-extensions' b"['<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', '<email address hidden>', 'activities-config@nls1729', '<email address hidden>', 'removeaccesibility@lomegor', '<email address hidden>', '<email address hidden>', 'window-title-in-topbar@fthx']"

2. If the problem reoccurs without extensions then next time use:

  killall -ABRT gnome-shell # or -USR1 ?

to generate a crash report and then follow these instructions:

  https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]