I am not sure if this is a bug, but it looks like x2gocleansessions keeps trying to open some previously saved session created by a deleted user. This leaves a log like the following in the /var/log/auth.log and this log continues to add in an infinite loop

Aug 22 18:17:32 taote su[6146]: - ??? root:trainer7

Aug 22 18:17:32 taote su[6147]: No passwd entry for user 'trainer7'

Aug 22 18:17:32 taote su[6147]: FAILED su for trainer7 by root

if I kill the x2gocleansessions process, the log stops.

if I run

sudo /usr/sbin/x2golistsessions_root

I can see the two zombie sessions

20580|trainer1-51-1502204631_stDXFCE_dp32|51|taote|S|2017-08-08T11:03:51|...|10.15.159.9|33463|33464|2017-08-08T17:56:15|trainer1|1236642|33465|

10905|trainer7-52-1502214187_stDXFCE_dp32|52|taote|S|2017-08-08T13:43:07|...|10.15.138.221|61994|61995|2017-08-08T13:59:17|trainer7|1227086|61996|

but could not find a way to purge then. Those two user accounts (trainer1 and trainer7) were created for an event previously, but after the event, both accounts have been deleted.

A reboot does not solve the issue. As long as you run "sudo service x2goserver restart", the error log comes back and keeps repeating itself.

Can someone suggest a way to purge these zombie sessions so that I don't see the error logs again?

thanks