gnome-control-center segfault when deleting nameless Search Locations

[James]

Ubuntu 19.10
gnome-control-center:
  Installed: 1:3.34.1-1ubuntu2

I encounter a force-close / segfault in gnome-control-center when trying to remove nameless Search Locations. These are found at Settings > Search > Search Locations > Other. (See attached screenshot.) These nameless search locations have existed since conducting a clean install of Ubuntu 19.10 and I've been unable to remove them with the GUI.

If it helps, here is the syslog data generated when I attempt to delete a nameless search location.
 All gnome-control-center windows immediately close.

Dec 7 14:30:29 hostname gnome-control-c[6999]: g_settings_get_value: assertion 'key != NULL' failed
Dec 7 14:30:29 hostname kernel: [30710.826921] gnome-control-c[6999]: segfault at 0 ip 00005564e62ccb5b sp 00007fff2765a6b0 error 4 in gnome-control-center[5564e621c000+136000]
Dec 7 14:30:29 hostname kernel: [30710.826943] Code: 44 24 08 e8 17 a6 f5 ff 31 ff 49 89 c7 e8 6d f3 ff ff 4c 89 ff 48 89 c6 e8 02 90 f5 ff 85 c0 0f 85 92 00 00 00 48 8b 5c 24 08 <48> 8b 3b 48 85 ff 74 49 45 31 ed 66 2e 0f 1f 84 00 00 00 00 00 4c
Dec 7 14:30:29 hostname gnome-control-c[6999]: g_variant_get_type: assertion 'value != NULL' failed
Dec 7 14:30:29 hostname gnome-control-c[6999]: g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)' failed
Dec 7 14:30:29 hostname gnome-control-c[6999]: g_variant_dup_strv: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_STRING_ARRAY)' failed
Dec 7 14:30:29 hostname gnome-control-c[6999]: g_variant_unref: assertion 'value != NULL' failed
Dec 7 14:30:29 hostname gnome-control-c[6999]: g_file_get_path: assertion 'G_IS_FILE (file)' failed

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-control-center 1:3.34.1-1ubuntu2
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Dec 7 14:38:01 2019
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2019-10-26 (42 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please try to obtain a backtrace following the instructions at http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace (as an attachment) to the bug report. This will greatly help us in tracking down your problem.

[Sebastien Bacher (seb128)]

Can you also provide the output of those commands

$ echo $XDG_DATA_DIRS
$ for dir in `tr ':' ' ' <<< $XDG_DATA_DIRS`; do ls -l $dir/gnome-shell/search-providers; done

[James (james-r-barker)]

Hi Sebastien,

Thank you for the reply. This is my first bug report -- if there is anything I'm missing can you let me know?
Here is the output from the two requested commands. I'm also attaching a valgrind log.

$ echo $XDG_DATA_DIRS
/usr/share/ubuntu-wayland:/usr/local/share/:/usr/share/

$ for dir in `tr ':' ' ' <<< $XDG_DATA_DIRS`; do ls -l $dir/gnome-shell/search-providers; done
ls: cannot access '/usr/share/ubuntu-wayland/gnome-shell/search-providers': No such file or directory
ls: cannot access '/usr/local/share//gnome-shell/search-providers': No such file or directory
total 20
-rw-r--r-- 1 root root 171 Oct 5 17:12 gnome-control-center-search-provider.ini
-rw-r--r-- 1 root root 815 Oct 22 13:22 gnome-terminal-search-provider.ini
-rw-r--r-- 1 root root 165 Oct 7 09:35 org.gnome.Calculator-search-provider.ini
-rw-r--r-- 1 root root 144 Oct 7 17:03 org.gnome.Nautilus.search-provider.ini
-rw-r--r-- 1 root root 165 May 16 2019 seahorse-search-provider.ini

[Sebastien Bacher (seb128)]

Thanks for the details, I was looking at the wrong place when I asked for the informations earlier but the issue is easy to reproduce.

Reported upstream now on
https://gitlab.gnome.org/GNOME/gnome-control-center/issues/812

The invalid entries are locations that got added to the tracker list but doesn't exist anymore, you can edit the list by editing org.freedesktop.Tracker.Miner.Files index-recursive-directories in gsettings/dconf-editor

[Sebastien Bacher (seb128)]

Upstream fixed the issue in git now