Raspberry Pi. Поднимаем watchdog mht
Watchdog и Raspberry Pi. Автоматический перезапуск при зависании mht
Raspberry Pi Increase Stability mht
Watchdog for Pi2 mht
RPi3B+ and watchdog mht
bcm2708_wdog.ko module not compiled since 4.3.3 mht

https://qastack.ru/raspberrypi/68331/how-to-keep-watchdog-timer-running-during-reboot-shutdown mht
(Is this) The correct ways to install the watchdog package? mht !!!!

1 Способ, systemd

/etc/systemd/system.conf

RuntimeWatchdogSec=10s
ShutdownWatchdogSec=10min
WatchdogDevice=/dev/watchdog

https://www.raspberrypi.org/forums/viewtopic.php?t=244843 Максимальное значение RuntimeWatchdogSec=16s, иначе будет ошибка
watchdog error: cannot set timeout 60 (errno = 22 = 'Invalid argument')

FORK-БОМБА

Python

fork_bomb.py

#/bin/python
#fork_bomb.py
 
import os
 
while True:
      os.fork()

$> python fork_bomb.py

Bash

>$ : (  ){ : | : &  }; :