Here is the server load with just 1 X2Go suspended user session:

2 users,  load average: 3.74, 4.95, 5.18

Here are some of his processes:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                      

11914 ouruser

  20   0 20.488g 0.018t   7116 R  90.7 80.5   1542:41 mate-panel  

11624 ouruser  20   0   48564   3812   2960 S   0.3  0.0  18:55.56 dbus-daemon                               

11932 ouruser  20   0  601340   8040   5768 S   0.3  0.0  22:01.75 wnck-applet                                      

12338 ouruser  20   0  591444   6180   5436 S   0.3  0.0   7:40.26 notification-ar 

Here is a ps:

ps -auwx | grep x2go

root      8749  0.1  0.0 183668 11428 ?        S    Feb19   3:01 /usr/bin/perl /usr/sbin/x2gocleansessions

root     11516  0.0  0.0 115996  1024 pts/0    S+   09:48   0:00 grep --color=auto x2go

ouruser 11518  0.0  0.0 116572  2720 ?        Ss   Feb18   0:00 /bin/bash /usr/bin/x2goruncommand 327 11426 ouruser-327-1519007899_stDMATE_dp32 59504 mate-session nosnd D

ouruser 11623  0.0  0.0  32340  1096 ?        S    Feb18   0:00 /usr/bin/dbus-run-session /etc/x2go/Xsession

And a systemctl status x2goserver

● x2goserver.service - X2Go Server Daemon

   Loaded: loaded (/usr/lib/systemd/system/x2goserver.service; enabled; vendor preset: disabled)

   Active: active (running) since Mon 2018-02-19 02:16:54 EST; 1 day 7h ago

 Main PID: 8749 (x2gocleansessio)

    Tasks: 1 (limit: 4915)

   Memory: 15.5M

      CPU: 6h 42min 49.407s

   CGroup: /system.slice/x2goserver.service

           └─8749 /usr/bin/perl /usr/sbin/x2gocleansessions

Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

rpm -q x2goserver

x2goserver-4.1.0.1-0.0x2go1.0.git20180218.1532.heuler.fc27.x86_64

Logs at the time the user logs in and disconnects:

Feb 18 21:38:15 ourserver systemd[1]: Started User Manager for UID 6675.

Feb 18 21:38:21 ourserver /usr/sbin/x2gocleansessions[30526]: ouruser-327-1519007899_stDMATE_dp32: state file for this s

ession does not exist: /tmp/.x2go-ouruser/C-ouruser-327-1519007899_stDMATE_dp32/state (this can be ignored during s

ession startups)

Feb 18 21:38:23 ourserver /usr/bin/x2gostartagent[11435]: successfully started X2Go Agent session with ID ouruser-327-15

19007899_stDMATE_dp32

Feb 18 21:38:26 ourserver /usr/bin/x2gosetkeyboard[11597]: Setting X keyboard according to /u/ourserver/csga/ouruser/.x2go/C

-ouruser-327-1519007899_stDMATE_dp32/keyboard

Feb 18 21:38:26 ourserver /usr/bin/x2goruncommand[11617]: launching session with Xsession-x2go mechanism, using STARTUP="

mate-session"

Feb 18 21:38:26 ourserver /usr/bin/x2goruncommand[11618]: dbus wrapper available as /usr/bin/dbus-run-session

Feb 18 21:38:27 ourserver baloo_file[17852]: QObject::connect: invalid null parameter

Feb 18 21:38:28 ourserver baloo_file[18750]: QObject::connect: invalid null parameter

Feb 18 21:38:28 ourserver baloo_file[5557]: QObject::connect: invalid null parameter

Feb 18 21:38:28 ourserver baloo_file[3418]: QObject::connect: invalid null parameter

Feb 18 21:38:31 ourserver gnome-keyring-daemon[11896]: couldn't access control socket: /run/user/6675/keyring/control: No such file or directory

Feb 18 21:38:31 ourserver mate-session[11631]: WARNING: GSIdleMonitor: IDLETIME counter not found

Feb 18 21:38:31 ourserver mate-session[11631]: GLib-GObject-CRITICAL: object GSIdleMonitor 0x7f73040054d0 finalized while still in-construction

Feb 18 21:38:31 ourserver mate-session[11631]: GLib-GObject-CRITICAL: Custom constructor for class GSIdleMonitor returned NULL (which is invalid). Please use GInitable instead.

Feb 18 21:38:36 ourserver gnome-keyring-daemon[11896]: The Secret Service was already initialized

Feb 18 21:38:36 ourserver spice-vdagent[11943]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0

Feb 18 21:38:37 ourserver gnome-keyring-daemon[11896]: The SSH agent was already initialized

Feb 18 21:38:37 ourserver pulseaudio[12014]: [pulseaudio] core-util.c: Failed to open configuration file '/u/ourserver/csga/ouruser/.x2go/C-ouruser-327-1519007899_stDMATE_dp32/.pulse-client.conf': No such file or directory

Feb 18 21:38:37 ourserver pulseaudio[11975]: [pulseaudio] core-util.c: Failed to open configuration file '/u/ourserver/csga/ouruser/.x2go/C-ouruser-327-1519007899_stDMATE_dp32/.pulse-client.conf': No such file or directory

Feb 18 21:38:38 ourserver dbus-daemon[892]: [system] Activating service name='org.freedesktop.problems' requested by ':1.14085' (uid=6675 pid=12070 comm="abrt-applet ") (using servicehelper)

Feb 18 21:38:38 ourserver dbus-daemon[892]: [system] Successfully activated service 'org.freedesktop.problems'

Feb 18 21:38:39 ourserver pulseaudio[12159]: [pulseaudio] core-util.c: Failed to open configuration file '/u/ourserver/csga/ouruser/.x2go/C-ouruser-327-1519007899_stDMATE_dp32/.pulse-client.conf': No such file or directory

Feb 18 21:38:39 ourserver dbus-daemon[892]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.14100" (uid=6675 pid=12088 comm="/usr/bin/pulseaudio --start --log-target=syslog ") interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" error name="(unset)" requested_reply="0" destination="org.bluez" (bus)

Feb 18 21:38:39 ourserver gnome-keyring-daemon[11896]: The PKCS#11 component was already initialized

Feb 18 21:38:40 ourserver pulseaudio[12088]: [pulseaudio] bluez5-util.c: GetManagedObjects() failed: org.freedesktop.DBus.Error.AccessDenied: Rejected send message, 2 matched rules; type="method_call", sender=":1.14100" (uid=6675 pid=12088 comm="/usr/bin/pulseaudio --start --log-target=syslog ") interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" error name="(unset)" requested_reply="0" destination="org.bluez" (bus)

Feb 18 21:38:41 ourserver caja[11928]: [N-A] Caja-Actions Tracker 1.8.3 initializing...

Feb 18 21:38:41 ourserver pulseaudio[12200]: [pulseaudio] pid.c: Daemon already running.

Feb 18 21:38:41 ourserver caja[11928]: [N-A] Caja-Actions Menu Extender 1.8.3 initializing...

Feb 18 21:38:41 ourserver pulseaudio[12227]: [pulseaudio] pid.c: Daemon already running.

Feb 18 21:38:41 ourserver dbus-daemon[892]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service' requested by ':1.14102' (uid=6675 pid=12179 comm="python3 /bin/blueman-applet ")

Feb 18 21:38:41 ourserver dbus-daemon[892]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.blue

z.service' requested by ':1.14102' (uid=6675 pid=12179 comm="python3 /bin/blueman-applet ")

Feb 18 21:38:41 ourserver systemd[1]: /usr/lib/systemd/system/bluetooth.service:22: Not an absolute path, ignoring: @stat

edir@

Feb 18 21:38:41 ourserver systemd[1]: /usr/lib/systemd/system/bluetooth.service:23: Not an absolute path, ignoring: @conf

dir@

Feb 18 21:38:43 ourserver dbus-daemon[892]: [system] Activating via systemd: service name='org.baseurl.DnfSystem' unit='d

nfdaemon.service' requested by ':1.14084' (uid=6675 pid=11942 comm="python3 /bin/dnfdragora-updater ")

Feb 18 21:38:43 ourserver systemd[1]: Starting Package management dnf daemon...

Feb 18 21:38:43 ourserver dbus-daemon[892]: [system] Successfully activated service 'org.baseurl.DnfSystem'

Feb 18 21:38:43 ourserver systemd[1]: Started Package management dnf daemon.

Feb 18 21:38:53 ourserver kernel: traps: caja[11928] trap int3 ip:7fbd51c6a771 sp:7fff3feea110 error:0 in libglib-2.0.so.

0.5400.3[7fbd51c1a000+111000]

Feb 18 21:38:54 ourserver systemd[1]: Started Process Core Dump (PID 12386/UID 0).

Feb 18 21:38:54 ourserver caja[12395]: [N-A] Caja-Actions Tracker 1.8.3 initializing...

Feb 18 21:38:54 ourserver caja[12395]: [N-A] Caja-Actions Menu Extender 1.8.3 initializing...

Feb 18 21:39:01 ourserver systemd-coredump[12387]: Process 11928 (caja) of user 6675 dumped core.#012#012Stack trace of t

hread 11928:#012#0  0x00007fbd51c6a771 _g_log_abort (libglib-2.0.so.0)#012#1  0x00007fbd51c6cda1 g_log_writer_default (libglib-2.0.so.0)#012#2  0x00007fbd51c6b30e g_log_structured_array (libglib-2.0.so.0)#012#3  0x00007fbd51c6b607 g_log_structured (libglib-2.0.so.0)#012#4  0x00007fbd5334c1e1 _gdk_x11_display_error_event (libgdk-3.so.0)#012#5  0x00007fbd53359783 gdk_x_error (libgdk-3.so.0)#012#6  0x00007fbd51921e3a _XError (libX11.so.6)#012#7  0x00007fbd5191ed6b handle_error (libX11.so.6)#012#8  0x00007fbd5191ee15 handle_response (libX11.so.6)#012#9  0x00007fbd5191f745 _XEventsQueued (libX11.so.6)#012#10 0x00007fbd51911240 XEventsQueued (libX11.so.6)#012#11 0x00007fbd527e6252 _cairo_xlib_shm_su0x00007fbd527e70fc _cairo_xlib_surface_create_similar_shm (libcairo.so.2)#012#14 0x00007fbd527b3f13 cairo_surface_create_similar_image (libcairo.so.2)#012#15 0x00007fbd53317e4c gdk_cairo_set_source_pixbuf (libgdk-3.so.0)#012#16 0x00007fbd54885c22 mate_bg_create_surface (libmate-desktop-2.so.17)#012#17 0x0000559937d3d24a eel_background_ensure_realized (caja)#012#18 0x0000559937d3d3c8 eel_background_set_up_widget (caja)#012#19 0x0000559937d3d57e background_changed_cb (caja)#012#20 0x00007fbd51c61577 g_idle_dispatch (libglib-2.0.so.0)#012#21 0x00007fbd51c64b77 g_main_context_dispatch (libglib-2.0.so.0)#012#22 0x00007fbd51c64f20 g_main_context_iterate.isra.23 (libglib-2.0.so.0)#012#23 0x00007fbd51c64fac g_main_context_iteration (libglib-2.0.so.0)#012#24 0x00007fbd52221cad g_application_run (libgio-2.0.so.0)#012#25 0x0000559937c5f500 main (caja)#012#26 0x00007fbd5056e00a __libc_start_main (libc.so.6)#012#27 0x0000559937c5f57a _start (caja)#012#012Stack trace of thread 12181:#012#0  0x00007fbd5226759f g_file_monitor_source_handle_event (libgio-2.0.so.0)#012#1  0x00007fbd5229393e ih_event_callback (libgio-2.0.so.0)#012#2  0x00007fbd52292d09 ip_event_dispatch.part.4 (libgio-2.0.so.0)#012#3  0x00007fbd52292f4e ip_event_callback (libgio-2.0.so.0)#012#4  0x00007fbd5229229a ik_source_dispatch (libgio-2.0.so.0)#012#5  0x00007fbd51c64b77 g_main_context_dispatch (libglib-2.0.so.0)#012#6  0x00007fbd51c64f20 g_main_context_iterate.isra.23 (libglib-2.0.so.0)#012#7  0x00007fbd51c64fac g_main_context_iteration (libglib-2.0.so.0)#012#8  0x00007fbd51c64ff1 glib_worker_main (libglib-2.0.so.0)#012#9  0x00007fbd51c8c486 g_thread_proxy (libglib-2.0.so.0)#012#10 0x00007fbd5093761b start_thread (libpthread.so.0)#012#11 0x00007fbd5066498f __clone (libc.so.6)#012#012Stack trace of thread 12192:#012#0  0x00007fbd506583db __poll (libc.so.6)#012#1  0x00007fbd51c64e99 g_main_context_iterate.isra.23 (libglib-2.0.so.0)#012#2  0x00007fbd51c64fac g_main_context_iteration (libglib-2.0.so.0)#012#3  0x00007fbd4079442d dconf_gdbus_worker_thread (libdconfsettings.so)#012#4  0x00007fbd51c8c486 g_thread_proxy (libglib-2.0.so.0)#012#5  0x00007fbd5093761b start_thread (libpthread.so.0)#012#6  0x00007fbd5066498f __clone (libc.so.6)#012#012Stack trace of thread 12370:#012#0  0x00007fbd5065ebf9 syscall (libc.so.6)#012#1  0x00007fbd51caa62a g_cond_wait_until (libglib-2.0.so.0)#012#2  0x00007fbd51c39381 g_async_queue_pop_intern_unlocked (libglib-2.0.so.0)#012#3  0x00007fbd51c8ce24 g_thread_pool_thread_proxy (libglib-2.0.so.0)#012#4  0x00007fbd51c8c486 g_thread_proxy (libglib-2.0.so.0)#012#5  0x00007fbd5093761b start_thread (libpthread.so.0)#012#6  0x00007fbd5066498f __clone (libc.so.6)#012#012Stack trace of thread 12182:#012#0  0x00007fbd506583db __poll (libc.so.6)#012#1  0x00007fbd51c64e99 g_main_context_iterate.isra.23 (libglib-2.0.so.0)#012#2  0x00007fbd51c65232 g_main_loop_run (libglib-2.0.so.0)#012#3  0x00007fbd5224db56 gdbus_shared_thread_func (libgio-2.0.so.0)#012#4  0x00007fbd51c8c486 g_thread_proxy (libglib-2.0.so.0)#012#5  0x00007fbd5093761b start_thread (libpthread.so.0)#012#6  0x00007fbd5066498f __clone (libc.so.6)

Feb 18 21:39:04 ourserver baloo_file[3418]: QObject::connect: invalid null parameter

Feb 18 21:39:04 ourserver baloo_file[5557]: QObject::connect: invalid null parameter

Feb 18 21:39:05 ourserver baloo_file[18750]: QObject::connect: invalid null parameter

Feb 18 21:39:05 ourserver baloo_file[17852]: QObject::connect: invalid null parameter

Feb 18 21:39:06 ourserver dbus-daemon[892]: [system] Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms)

Feb 18 21:39:08 ourserver python3[12179]: detected unhandled Python exception in '/bin/blueman-applet'

Feb 18 21:39:21 ourserver dbus-daemon[892]: [system] Activating service name='org.mate.SettingsDaemon.DateTimeMechanism' requested by ':1.14131' (uid=6675 pid=12336 comm="/usr/libexec/mate-panel/clock-applet ") (using servicehelper)

Feb 18 21:39:21 ourserver dbus-daemon[892]: [system] Successfully activated service 'org.mate.SettingsDaemon.DateTimeMechanism'

Feb 18 21:39:36 ourserver abrt-notification[12723]: Process 11928 (caja) crashed in gdk_x_error()

Feb 18 21:39:36 ourserver abrt-server[12509]: Deleting problem directory Python3-2018-02-18-21:39:08-12179 (dup of Python3-2018-02-15-18:40:16-3479)

Feb 18 21:39:37 ourserver abrt-notification[12735]: Process 3479 (blueman-applet) of user 6675 encountered an uncaught GLib.GError exception

Feb 18 21:41:02 ourserver automount[31776]: add_host_addrs: hostname lookup failed: No address associated with hostname

Feb 18 21:41:43 ourserver PackageKit[15297]: search-file transaction /12276_bcdacbee from uid 6675 finished with success after 408ms

Feb 18 21:45:50 ourserver baloo_file[5557]: QObject::connect: invalid null parameter

Feb 18 21:45:51 ourserver baloo_file[17852]: QObject::connect: invalid null parameter

Feb 18 21:45:51 ourserver baloo_file[3418]: QObject::connect: invalid null parameter

Feb 18 21:45:51 ourserver baloo_file[18750]: QObject::connect: invalid null parameter

Feb 18 21:46:01 ourserver /usr/bin/x2gosuspend-session[14346]: session with ID ouruser-327-1519007899_stDMATE_dp32 has been suspended successfully

Feb 18 21:46:02 ourserver systemd-logind[1945]: Removed session 4273.

Feb 18 21:46:02 ourserver systemd[1]: Stopping User Manager for UID 6675...

I figured I'd include what I could get from a gdb on the Mate core file:

warning: core file may not match specified executable file.

Reading symbols from /usr/libexec/mate-notification-daemon...Reading symbols from /usr/lib/debug/usr/libexec/mate-notification-daemon-1.19.1-1.fc27.x86_64.debug...done.

done.

warning: Ignoring non-absolute filename: <linux-vdso.so.1>

Missing separate debuginfo for linux-vdso.so.1

Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/34/aef3552ea0558533a32c64cecbea32c5a96c52

Missing separate debuginfo for /lib64/libwayland-egl.so.1

Try: dnf --enablerepo='*debug*' install /usr/lib/debug/.build-id/34/03db48ea562a74e13d645554fe90b7cbdb138f

warning: .dynamic section for "/lib64/libwayland-egl.so.1" is not at the expected address (wrong library or version mismatch?)

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib64/libthread_db.so.1".

Core was generated by `/usr/libexec/mate-notification-daemon'.

Program terminated with signal SIGTRAP, Trace/breakpoint trap.

#0  _g_log_abort (breakpoint=breakpoint@entry=1) at gmessages.c:554

554 }