My O/S is CentOS 7.6 with all updates as of today.

I have a system where many users log in and run GNOME sessions via VNC (xrdp). I do not want idle sessions hanging around forever, so I followed the instructions for enabling automatic logout.

GNOME version

Redhat version

Both sets of instructions are the same: Create /etc/dconf/db/local.d/00-autologout; set the sleep-inactive-ac-timeout and sleep-inactive-ac-type keys in the [org/gnome/settings-daemon/plugins/power] section; run dconf update.

I did this, setting the timeout to 604800 seconds (1 week). And it works!

Well, except for one thing. The X server on the local console exited one week later, and gdm did not restart it.

This has happened a few times on a few systems now, and only after I enabled the automatic logout mechanism, so I am very certain it is responsible.

The last few lines of my /var/log/gdm/:0.log file read:

AUDIT: Wed Feb 20 15:15:11 2019: 27188: client 15 disconnected
AUDIT: Mon Feb 25 20:56:28 2019: 27188: client 6 disconnected
AUDIT: Mon Feb 25 20:56:28 2019: 27188: client 6 connected from local host ( uid=42 gid=42 pid=28256 )
  Auth name: MIT-MAGIC-COOKIE-1 ID: 804
AUDIT: Mon Feb 25 20:56:28 2019: 27188: client 6 disconnected
[...more "client XX disconnected lines"...]
AUDIT: Mon Feb 25 20:56:28 2019: 27188: client 14 disconnected
(II) evdev: HID 0557:2419: Close
(II) evdev: HID 0557:2419: Close
(II) evdev: Power Button: Close
(II) Server terminated successfully (0). Closing log file.

/var/log/Xorg.0.log is very similar. No errors; just a clean server shutdown.

ps shows that /usr/sbin/gdm is still running but has no child processes. The X server for :0 simply exited cleanly and never got restarted.

Logging in and out on the console by hand works fine. And everything is OK if I disable automatic logout, except then I don't have automatic logout.

I am not entirely sure what to try next. If gdm fails to restart the X server after it exits, is that a gdm bug by definition?


I can reproduce this problem, sort of, without using autologout.

If I log in remotely and just kill (-HUP, -INT, -9, whatever) the X server for :0, gdm does not restart it.

But only if nobody is logged in on the console at the time. If anyone is logged in, gdm restarts the X server fine.

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