can the hardware watchdog reboot a hung kernel?

[Eugene Grosbein]

14.11.2019 22:35, Daniel Braniss wrote:

>> It's possible if the hardware has such a watchdog and kernel subsystem watchdog(4) supports it.
>> rc.conf(5) manual page describes watchdogd_enable option.
>>
> 
> yes, but it relys  on user land, what if the kernel is hung? 

No, it does not relay on userland. Well, in part: userland daemon replies to hardware watchdog "host is alive"
and if system hangs and watchdog stops getting replies, it resets the system.