Logout fails (Unity7,Ubuntu-Gnome, Xenial)

[Khurshid Alam]

On my machine logout takes too long time and eventually fails. Syslog or /var/log/lightdm doesn't give something very useful. From syslog only error I find is:

Feb 19 22:15:57 Saturnica gnome-session[1162]: gnome-session-binary[1162]: GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Feb 19 22:15:57 Saturnica gnome-session-binary[1162]: GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed......

I can reproduce this in both Gnome-shell and Unity7. I attaching the part of the syslog. If more information is required I will provide it.

Gnome-session: 3.18.1.2-1ubuntu1
Systemd: 229-4ubuntu4

[Khurshid Alam (khurshid-alam)]

I can still reproduce this after fresh install and updates with final release.

[Launchpad Janitor (janitor)]

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

[Robert Hrovat (robi-hipnos)]

Same here. Been banging my head for months and couldn't find the reason or fix. Reinstalled everything from scratch and still the same. The last strings in log files were:

Syslog (repeated at least 10 times):
g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Oct 27 09:52:39 Asgard gnome-session-binary[6607]: GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

Authlog:
Oct 27 09:52:39 Asgard polkitd(authority=local): Unregistered Authentication Agent for unix-session:c8 (system bus name :1.698, object path /org/gnome/PolicyKit1/AuthenticationAgent, locale sl_SI.UTF-8) (disconnected from bus)

[Robert Hrovat (robi-hipnos)]

I think I found the cause. I accidentally forgot to install diodon clipboard manager and machine logout instantly.

Khurshid, can you check if you have didon installed and if removing it helps?

[Khurshid Alam (khurshid-alam)]

That's it. Diodon was indeed the culprit. But why does a simple clipboard manager behave like that? Is it trying to clear cache before session logout? Or something else?

I can reproduce only with systemd. It works fine with upstrart. May we should file a bug in diodon.

[Robert Hrovat (robi-hipnos)]

It appears this is an old bug:
https://bugs.launchpad.net/ubuntu/+source/diodon/+bug/1391330

And it was fixed. The problem is, Ubuntu repo has old version.
https://bugs.launchpad.net/ubuntu/+source/diodon/+bug/1563435

[Khurshid Alam (khurshid-alam)]

Thanks. It seems installing from the daily PPA fixes the problem. Marking this as invalid.