Comment 7 for bug 1772542

// from auth.log (29-may was last night, 30-may was wake of system today)

May 30 09:54:56 d960-ubu2 gdm-password]: pam_unix(gdm-password:session): session closed for user guiverc
May 30 09:54:59 d960-ubu2 dbus-daemon[1020]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.220" (uid=1000 pid=25256 comm="/usr/bin/pulseaudio --start --log-target=syslog " label="unconfined") interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" error name="(unset)" requested_reply="0" destination="org.bluez" (bus)
May 30 09:55:07 d960-ubu2 gdm-password]: pam_unix(gdm-password:session): session opened for user guiverc by (uid=0)

// I think crash was 09:54:59 (in that log)

// from syslog

May 30 09:54:51 d960-ubu2 systemd-resolved[895]: Using degraded feature set (UDP) for DNS server 203.0.178.191.
May 30 09:54:56 d960-ubu2 transmission-gt[17087]: transmission-gtk: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:56 d960-ubu2 at-spi-bus-launcher[1995]: XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
May 30 09:54:57 d960-ubu2 at-spi-bus-launcher[1995]: after 37113 requests (37113 known processed) with 0 events remaining.
May 30 09:54:57 d960-ubu2 [23692]: mate-notification-daemon: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.
May 30 09:54:57 d960-ubu2 /usr/lib/gdm3/gdm-x-session[1844]: xfce4-volumed: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 [3451]: gnome-clocks: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 /usr/lib/gdm3/gdm-x-session[1844]: wrapper-1.0: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 [2213]: blueman-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 /usr/lib/gdm3/gdm-x-session[1844]: audacious: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 [3236]: xfce4-terminal: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 /usr/lib/gdm3/gdm-x-session[1844]: kerneloops-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.0.
May 30 09:54:57 d960-ubu2 [2059]: telegram: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

these messages repeat for each app I must have had open, then for XFCE apps ... - refer attachment

// i think 09:55:07 is X starting again sending me to greeter after crash

NOTE: I'm no expert & this is only 'user' opinion

New crash reports in /var/crash are
-rw-r----- 1 guiverc whoopsie 882227 May 29 14:17 _usr_bin_light-locker.1000.crash
-rw-r----- 1 guiverc whoopsie 24809765 May 30 09:54 _usr_lib_xorg_Xorg.1000.crash

I'll upload these & add any report-numbers to this on next comment. I will attach my
current syslog & next comment auth.log & dmesg (dated 2018-05-30 & timestamped just before 1000)