Yes consuming a large amount of CPU and not doing anything useful,
customer is disconnected. Connection is still possible but doesn't get rid of the stuck processes, I have to kill -9 to get rid of them.
Uhm... "stuck" is pretty ambiguous in that context - I assume that you are referring to the CPU usage, which doesn't go down to sane levels even after reconnecting, but reconnecting to the session as such is possible?
Is there any reasonable way to trigger this behavior? Like starting a MATE session, disconnecting and waiting for an hour to see the CPU usage spike? Or is it triggered by other programs running inside of the session?
I'll need something to reproduce it, server OS information would also be great.
There is https://bugs.x2go.org/1260 which sounds like the same issue, but I haven't had time to get into this yet. This issue is observable on Fedora 27, but if it's even observable on Debian or Ubuntu or other distros it would also be interesting information.
Mihai