Public bug reported:

I observed that gnome-shell crashes when I tried to load the Software
Sources application. After a bit of trial and error it turned out that
the crash only occurs if searching files is enabled in Settings. I can
reliably trigger the crash by typing "so" into the search box.

Sometimes only the search window crashes, leaving all windows open.
Other times Gnome crashes, returning me to the login screen after around
20 seconds.

When the files search is off, no crash is observed.

Attached is a syslog excerpt for the crash. It has two searches - I
searched for "s", and then I searched for "so", both with Files search
on. The crash occurs after the second search.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.1-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 29 14:44:28 2017
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'app-picker-view' b'uint32 1'
 b'org.gnome.shell' b'favorite-apps' b"['org.gnome.Nautilus.desktop', 
'org.gnome.Software.desktop', 'gnome-control-center.desktop', 
'google-chrome.desktop', 'gnome-system-monitor.desktop', 
'nvidia-settings.desktop', 'PlayOnLinux.desktop', 'jetbrains-pycharm.desktop', 
'steam.desktop', 'org.gnome.Terminal.desktop', 'dolphin-emu.desktop', 
'openmw.desktop']"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2016-02-10 (626 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2017-10-29 (0 days ago)

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


** Tags: amd64 apport-bug artful

** Attachment added: "Excerpt from syslog when searching "s", followed by 
searching "so""
   
https://bugs.launchpad.net/bugs/1728384/+attachment/4999403/+files/syslog_excerpt

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https://bugs.launchpad.net/bugs/1728384

Title:
  gnome-shell crashes when searching files

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