Public bug reported:

Gnome-shell crashes randomly and causes a black screen for about 1
second. It immediately recovers and one can continue the session without
logging in again. This occurs once daily, so it is not yet annoying.

dmesg shows, that the segfault is caused by the spidermonkey library:
[200133.385393] gnome-shell[29344]: segfault at 440000000000 ip 
00007f162d78e1c3 sp 00007ffec34850c0 error 4 in 
libmozjs-24.so.0.0.0[7f162d691000+55e000]

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-shell 3.18.5-0ubuntu0.3
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
Uname: Linux 4.4.0-78-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Aug  2 10:24:43 2017
DisplayManager: lightdm
GsettingsChanges:
 b'org.gnome.shell' b'favorite-apps' b"['ubiquity-gtkui.desktop', 
'firefox.desktop', 'evolution.desktop', 'empathy.desktop', 'rhythmbox.desktop', 
'shotwell.desktop', 'libreoffice-writer.desktop', 'org.gnome.Nautilus.desktop', 
'yelp.desktop']"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'icon-theme' b"'ubuntu-mono-dark'"
 b'org.gnome.desktop.interface' b'gtk-theme' b"'Ambiance'"
InstallationDate: Installed on 2015-11-05 (635 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages xenial

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https://bugs.launchpad.net/bugs/1708114

Title:
  Gnome-shell crashes randomly and causes black screen for 1 second

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