Gnome Software consumes way too much CPU resources at times

Seen that this morning on a fully updated artful. Shortly after boot, a gnome-software process started consuming 100% CPU and continued doing so for a few hours, after which I killed it.
I had not opened the gnome-software GUI, only applied a few updates manually with apt:

Start-Date: 2017-08-18 07:57:43
Commandline: apt dist-upgrade
Requested-By: osomon (1000)
Upgrade: lxc-common:amd64 (2.0.8-0ubuntu3, 2.0.8-0ubuntu5), exim4-base:amd64 (4.89-3ubuntu2, 4.89-5ubuntu1), libefivar1:amd64 (30-1ubuntu1, 31-1), python3-software-properties:amd64 (0.96.24.14, 0.96.24.15), python3-lxc:amd64 (2.0.8-0ubuntu3, 2.0.8-0ubuntu5), snapd:amd64 (2.27.1+17.10, 2.27.2+17.10), libefiboot1:amd64 (30-1ubuntu1, 31-1), exim4-daemon-light:amd64 (4.89-3ubuntu2, 4.89-5ubuntu1), lxc-templates:amd64 (2.0.8-0ubuntu3, 2.0.8-0ubuntu5), lxc1:amd64 (2.0.8-0ubuntu3, 2.0.8-0ubuntu5), software-properties-gtk:amd64 (0.96.24.14, 0.96.24.15), libunity-gtk2-parser0:amd64 (0.0.0+17.10.20170816-0ubuntu1, 0.0.0+17.10.20170817-0ubuntu1), lxc:amd64 (2.0.8-0ubuntu3, 2.0.8-0ubuntu5), liblxc1:amd64 (2.0.8-0ubuntu3, 2.0.8-0ubuntu5), libappstream-glib8:amd64 (0.7.1-1, 0.7.1-2), unity-gtk-module-common:amd64 (0.0.0+17.10.20170816-0ubuntu1, 0.0.0+17.10.20170817-0ubuntu1), exim4-config:amd64 (4.89-3ubuntu2, 4.89-5ubuntu1), chromium-browser:amd64 (61.0.3163.39-0ubuntu1.1381, 61.0.3163.49-0ubuntu1.1382), unity-gtk2-module:amd64 (0.0.0+17.10.20170816-0ubuntu1, 0.0.0+17.10.20170817-0ubuntu1), libunity-gtk3-parser0:amd64 (0.0.0+17.10.20170816-0ubuntu1, 0.0.0+17.10.20170817-0ubuntu1), chromium-codecs-ffmpeg-extra:amd64 (61.0.3163.39-0ubuntu1.1381, 61.0.3163.49-0ubuntu1.1382), ufw:amd64 (0.35-4, 0.35-5), exim4:amd64 (4.89-3ubuntu2, 4.89-5ubuntu1), chromium-browser-l10n:amd64 (61.0.3163.39-0ubuntu1.1381, 61.0.3163.49-0ubuntu1.1382), poppler-data:amd64 (0.4.7-8, 0.4.8-1), libsamplerate0:amd64 (0.1.8-8, 0.1.9-1), libsamplerate0:i386 (0.1.8-8, 0.1.9-1), unity-gtk3-module:amd64 (0.0.0+17.10.20170816-0ubuntu1, 0.0.0+17.10.20170817-0ubuntu1), libclutter-gtk-1.0-0:amd64 (1.8.2-2, 1.8.4-1), software-properties-common:amd64 (0.96.24.14, 0.96.24.15)
End-Date: 2017-08-18 07:58:17

Contents of syslog:

$ grep -i gnome-software /var/log/syslog
Aug 18 07:25:53 bribon gnome-software[6539]: no app for changed <email address hidden>
Aug 18 07:25:53 bribon gnome-software[6539]: no app for changed suspend-button@laserb
Aug 18 07:25:53 bribon gnome-software[6539]: no app for changed timezone@jwendell
Aug 18 07:31:24 bribon gnome-software[6539]: no app for changed timezone@jwendell
Aug 18 07:31:24 bribon gnome-software[6539]: no app for changed suspend-button@laserb
Aug 18 07:31:24 bribon gnome-software[6539]: no app for changed <email address hidden>
Aug 18 07:49:44 bribon gnome-software[6539]: no app for changed <email address hidden>
Aug 18 07:49:44 bribon gnome-software[6539]: no app for changed suspend-button@laserb
Aug 18 07:49:44 bribon gnome-software[6539]: no app for changed timezone@jwendell
Aug 18 07:57:49 bribon gnome-software[6539]: failed to rescan: Failed to parse /usr/share/applications/chromium-browser.desktop.dpkg-new file: cannot process file of type text/plain
Aug 18 07:57:49 brib...

Status changed to 'Confirmed' because the bug affects multiple users.

It's done it again this morning. See attached screenshot.

Again, I have not opened the gnome-software GUI, only applied a few updates manually with apt:

Start-Date: 2017-08-19 10:03:08
Commandline: apt dist-upgrade
Requested-By: osomon (1000)
Install: gnome-shell-extension-ubuntu-dock:amd64 (0.2, automatic)
Upgrade: ubuntu-settings:amd64 (17.10.10, 17.10.12), gnome-control-center-data:amd64 (1:3.24.3-0ubuntu3, 1:3.24.3-0ubuntu4), libqpdf17:amd64 (6.0.0-2, 6.0.0-2ubuntu1), libaugeas0:amd64 (1.8.0-1, 1.8.1-1), gnome-video-effects:amd64 (0.4.1-3ubuntu1, 0.4.3-1ubuntu1), gnome-session:amd64 (3.24.1-0ubuntu20, 3.24.1-0ubuntu21), gedit:amd64 (3.22.1-0ubuntu1, 3.22.1-1ubuntu1), gnome-session-common:amd64 (3.24.1-0ubuntu20, 3.24.1-0ubuntu21), unity-session:amd64 (3.24.1-0ubuntu20, 3.24.1-0ubuntu21), gnome-control-center:amd64 (1:3.24.3-0ubuntu3, 1:3.24.3-0ubuntu4), libsystemd0:amd64 (234-2ubuntu2, 234-2ubuntu6), libsystemd0:i386 (234-2ubuntu2, 234-2ubuntu6), libpugixml1v5:amd64 (1.8.1-3, 1.8.1-5), xdg-user-dirs:amd64 (0.15-2ubuntu7, 0.15-3ubuntu1), snapd:amd64 (2.27.2+17.10, 2.27.3+17.10), augeas-lenses:amd64 (1.8.0-1, 1.8.1-1), gdebi-core:amd64 (0.9.5.7+nmu1, 0.9.5.7+nmu1ubuntu1), ubuntu-standard:amd64 (1.394, 1.395), ubuntu-session:amd64 (3.24.1-0ubuntu20, 3.24.1-0ubuntu21), ubuntu-desktop:amd64 (1.394, 1.395), udev:amd64 (234-2ubuntu2, 234-2ubuntu6), gdebi:amd64 (0.9.5.7+nmu1, 0.9.5.7+nmu1ubuntu1), libudev1:amd64 (234-2ubuntu2, 234-2ubuntu6), libio-socket-ssl-perl:amd64 (2.049-1, 2.050-1), libapt-pkg-perl:amd64 (0.1.32build1, 0.1.33), libgmime-3.0-0:amd64 (3.0.1-3, 3.0.1-4), ubuntu-minimal:amd64 (1.394, 1.395), libudev-dev:amd64 (234-2ubuntu2, 234-2ubuntu6), libnss-myhostname:amd64 (234-2ubuntu2, 234-2ubuntu6), systemd-sysv:amd64 (234-2ubuntu2, 234-2ubuntu6), gnome-shell-common:amd64 (3.24.3-0ubuntu3, 3.24.3-0ubuntu4), libpam-systemd:amd64 (234-2ubuntu2, 234-2ubuntu6), gedit-common:amd64 (3.22.1-0ubuntu1, 3.22.1-1ubuntu1), systemd:amd64 (234-2ubuntu2, 234-2ubuntu6), libwebkit2gtk-4.0-37:amd64 (2.17.90-1ubuntu1, 2.17.91-1ubuntu1), gnome-session-bin:amd64 (3.24.1-0ubuntu20, 3.24.1-0ubuntu21), qpdf:amd64 (6.0.0-2, 6.0.0-2ubuntu1), libgcab-1.0-0:amd64 (0.7-3, 0.7-4), gnome-control-center-faces:amd64 (1:3.24.3-0ubuntu3, 1:3.24.3-0ubuntu4), libnss-resolve:amd64 (234-2ubuntu2, 234-2ubuntu6), gir1.2-webkit2-4.0:amd64 (2.17.90-1ubuntu1, 2.17.91-1ubuntu1), gnome-shell:amd64 (3.24.3-0ubuntu3, 3.24.3-0ubuntu4), ubuntu-web-launchers:amd64 (17.10.10, 17.10.12), libjavascriptcoregtk-4.0-18:amd64 (2.17.90-1ubuntu1, 2.17.91-1ubuntu1), libidn2-0:amd64 (2.0.2-1, 2.0.2-3), libwebkit2gtk-4.0-37-gtk2:amd64 (2.17.90-1ubuntu1, 2.17.91-1ubuntu1), gir1.2-javascriptcoregtk-4.0:amd64 (2.17.90-1ubuntu1, 2.17.91-1ubuntu1)
End-Date: 2017-08-19 10:03:58

Contents of syslog:

osomon@bribon:~$ grep -i gnome-software /var/log/syslog
Aug 19 10:10:39 bribon gnome-software[6948]: no app for changed suspend-button@laserb
Aug 19 10:10:39 bribon gnome-software[6948]: no app for changed timezone@jwendell
Aug 19 10:10:39 bribon gnome-software[6948]: no app for changed <email address hidden>
Aug 19 10:42:52 bribon gnome-software[6948]: no app for changed <email address hidden>...

Same experience than Olivier on resume from suspend. gnome-software was using 200% CPU.

I've hit this a few times and was never ever to find anything useful. However, this time I think I know what triggered the load. I manually installed d-feet with apt, and within a couple minutes removed it with apt. My laptop load spiked and stayed that way until I killed the process over 2 hours later. While debugging it, the only thing that stood out was this log message:

Sep 7 15:02:22 mucho gnome-software[5113]: failed to rescan: Failed to parse /usr/share/applications/d-feet.desktop file: cannot process file of type application/x-desktop

I heard the fan spin up less than a minute after I removed d-feet. Maybe something was queued to scan that desktop file and it was gone by the time it was ready to scan it? I briefly used strace on the process and it just looked like a bunch of waits, nothing that looked interesting. I left it in this state for over 2 hours to see if it would ever recover, but it didn't and I ultimately killed the gnome-software process.

Could be the same as bug #1716579 which has details/backtraces of snapd-glib code