Gnome Shell freezes randomly

[mathieu toumson]

Description is almost the same as https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1807534

Ubuntu 18.04.5 LTS, all packages up to date
gnome-shell 3.28.4-0ubuntu18.04.3

Sometimes gnome-shell freezes.
I can move the mouse pointer, but the rest of the UI is completely frozen and does not react to mouse clicks or keystrokes.

If I try to change login session with Ctrl-Alt-F1, I can login but the screen remains black.

I generally manage to "unfreeze" gnome-shell by switching to a virtual console and typing "killall -3 gnome-shell"

dmesg shows a page allocation failure in gnome-shell, cf attached file.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.4-0ubuntu18.04.3
ProcVersionSignature: Ubuntu 5.4.0-54.60~18.04.1-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 25 11:10:35 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-02-21 (278 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1897659, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.