[SOLVED] Raspbian Jessie, how check watchdog ?

[VecH]

How check watchdog timer onboard Raspberry PI
fork bomb

Code: Select all

#/bin/python
#fork_bomb.py

import os
 
while True:
      os.fork()

not working, Raspberry PI freezes and not rebooted

this scrypt worked on Raspbian Wheezy

[VecH]

Please check this forkbomb on Raspbian Jessie with Onboard watchdog

[Aydan]

Do you actually have the watchdog enabled? By default it is not enabled.

[VecH]

Code: Select all

$ sudo modprobe bcm2708_wdog
$ sudo sh -c "echo 'bcm2708_wdog' >> /etc/modules"
$ sudo apt-get install watchdog chkconfig
$ sudo chkconfig watchdog on
$ sudo service watchdog start

Uncomment two string in file: /etc/watchdog.conf

Code: Select all

$ sudo nano /etc/watchdog.conf
watchdog-device = /dev/watchdog
max-load-1 = 24

Code: Select all

echo "options bcm2708_wdog nowayout=1 heartbeat=13" | sudo tee /etc/modprobe.d/watchdog.conf
$ sudo reboot

$ dmesg | grep watchdog
[   16.012628] bcm2708 watchdog, heartbeat=13 sec (nowayout=1)

[DougieLawson]

You need to edit /etc/modules and add

Code: Select all

bcm2708_wdog

to get the kernel module loaded.

[VecH]

I forget write in start

Code: Select all

$ sudo modprobe bcm2708_wdog
$ sudo sh -c "echo 'bcm2708_wdog' >> /etc/modules"

Post edited

[DougieLawson]

I've tested this on both my A+ and my 2B and your fork bomb caused both systems to reboot.

That's with current Jessie and the leading edge 4.1.12+/4.1.12-v7+ #825 kernel (installed with rpi-update).

[VecH]

You use clear Raspbian Jessie or update from Wheezy ?
If clear install, start script in Jessie not started in boot and config watchdog module in file /etc/default/watchdog

service watchdog does not start when boot
If you manually run all started

How to diagnose?

p.s. I hate systemd

[VecH]

I found promblem and solved
http://raspberrypi.stackexchange.com/qu ... rt-at-boot