Package: firefox Version: 57.0.1-1 I pressed Ctrl-T to open a new tab and the whole Xorg session restarted.
Looking at journalctl -n 10000 I found memory issues (log below) Looking at Ganglia (chart attached), I found that the system was using 10GB out of 16GB, so there was 6GB free RAM. After logging in again, I only start Firefox and Thunderbird and its using 4GB again, as demonstrated in the chart. 19:02:45 host1 evolution.desktop[12511]: Memory pressure relief: Total: res = 12349440/12349440/0, res+swap = 0/0/0 19:03:15 host1 evolution.desktop[12511]: Memory pressure relief: Total: res = 12349440/12349440/0, res+swap = 0/0/0 19:03:45 host1 evolution.desktop[12511]: Memory pressure relief: Total: res = 12349440/12349440/0, res+swap = 0/0/0 19:04:15 host1 evolution.desktop[12511]: Memory pressure relief: Total: res = 12349440/12349440/0, res+swap = 0/0/0 19:04:45 host1 evolution.desktop[12511]: Memory pressure relief: Total: res = 12349440/12349440/0, res+swap = 0/0/0 19:04:45 host1 systemd[1]: Started Run anacron jobs. 19:04:45 host1 anacron[2100]: Anacron 2.3 started on 2017-12-29 19:04:45 host1 anacron[2100]: Normal exit (0 jobs run) 19:04:45 host1 systemd[1]: anacron.timer: Adding 2min 33.276752s random time. 19:05:01 host1 CRON[2110]: pam_unix(cron:session): session opened for user root by (uid=0) 19:05:01 host1 CRON[2111]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1) 19:05:01 host1 CRON[2110]: pam_unix(cron:session): session closed for user root 19:05:15 host1 evolution.desktop[12511]: Memory pressure relief: Total: res = 12349440/12349440/0, res+swap = 0/0/0 19:05:24 host1 /usr/lib/gdm3/gdm-x-session[3173]: intel_do_flush_locked failed: Cannot allocate memory 19:05:24 host1 gnome-terminal-[7552]: gnome-terminal-server: Fatal IO error 11 (Resource temporarily unavailable) on X server :1. 19:05:24 host1 systemd[3155]: gnome-terminal-server.service: Main process exited, code=exited, status=1/FAILURE 19:05:24 host1 org.a11y.atspi.Registry[3257]: XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":1" 19:05:24 host1 org.a11y.atspi.Registry[3257]: after 66481 requests (66481 known processed) with 0 events remaining. 19:05:24 host1 libreoffice-writer.desktop[17526]: X IO Error 19:05:24 host1 systemd[3155]: gnome-terminal-server.service: Unit entered failed state. 19:05:24 host1 polkitd(authority=local)[895]: Unregistered Authentication Agent for unix-session:2 (system bus name :1.168, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_IE.UTF-8) (disconnected from bus) 19:05:24 host1 kerneloops-applet.desktop[3415]: kerneloops-applet: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.
