april 17 06:28:36 spectre kernel: watchdog: watchdog0: watchdog did not stop!
april 17 06:28:36 spectre systemd[1]: Set hardware watchdog to 10min.
april 17 06:28:36 spectre systemd[1]: Hardware watchdog 'iTCO_wdt', version 0
Many users need this feature due to their system’s mission-critical role (i.e. servers), or because of the lack of power reset (i.e. embedded devices). Thus, this feature is required for a good operation in some situations. On the other hand, normal users (i.e. desktop and laptop) do not need this feature and can disable it.
To disable watchdog timers (both software and hardware), append nowatchdog to your boot parameters.
e.g. sudo nano /etc/default/grub
add nowatchdog to the kernel line like so:
GRUB_CMDLINE_LINUX_DEFAULT="quiet nowatchdog ..."
save [Ctrl+X]
rebuild grub.cfg:
sudo grub-mkconfig -o /boot/grub/grub.cfg
reboot