This seems to be a problem with any systemd timer that contains a 'RandomizedDelaySec' value in the [Timer] section. Multiple randomization adjustments to a timer will often occur in quick succession, sometimes simultaneously, and for no purpose that I can see.
Perhaps systemd timers need a flag to indicate that timer randomization has already occurred since the relevant service was last run, so don't do it again. This is the result of 'journalctl -b | grep "random time"' covering just the first hour after booting Xubuntu 16.04.1 this morning: Nov 03 05:02:18 Phil-Desktop systemd[1]: hosts_append.timer: Adding 14.771780s random time. Nov 03 05:02:18 Phil-Desktop systemd[1]: emachine-mount-nfs.timer: Adding 3.905842s random time. Nov 03 05:02:18 Phil-Desktop systemd[1]: apt-daily.timer: Adding 11h 10min 46.989419s random time. Nov 03 05:02:18 Phil-Desktop systemd[1]: send_boot_notify.timer: Adding 12.437715s random time. Nov 03 05:02:18 Phil-Desktop systemd[1]: send_apt_upgrades_list.timer: Adding 41min 20.509782s random time. Nov 03 05:02:18 Phil-Desktop systemd[1]: send_journald_log_list.timer: Adding 3min 48.321721s random time. Nov 03 05:02:19 Phil-Desktop systemd[1]: send_apt_upgrades_list.timer: Adding 2min 53.039364s random time. Nov 03 05:02:19 Phil-Desktop systemd[1]: send_journald_log_list.timer: Adding 9min 39.120834s random time. Nov 03 05:02:19 Phil-Desktop systemd[1]: send_boot_notify.timer: Adding 649.932ms random time. Nov 03 05:02:19 Phil-Desktop systemd[1]: apt-daily.timer: Adding 10h 36min 12.532296s random time. Nov 03 05:02:19 Phil-Desktop systemd[1]: hosts_append.timer: Adding 4.994423s random time. Nov 03 05:03:39 Phil-Desktop systemd[1]: apt-daily.timer: Adding 4h 53min 16.440349s random time. Nov 03 05:03:39 Phil-Desktop systemd[1]: apt-daily.timer: Adding 8h 44min 23.219990s random time. Nov 03 06:03:45 Phil-Desktop systemd[1]: send_apt_upgrades_list.timer: Adding 55min 558.055ms random time. Nov 03 06:03:45 Phil-Desktop systemd[1]: send_apt_upgrades_list.timer: Adding 25min 6.210969s random time. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1576536 Title: timer messages unnecessarily sent to /dev/kmsg To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1576536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
