Date: Thu, 14 Nov 2019 22:53:04 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: can the hardware watchdog reboot a hung kernel? Message-ID: <a9c4fc76-df3f-3c49-b4bf-0d1d10f64078@grosbein.net> In-Reply-To: <2AD912BF-97B0-421D-B561-722D74864DC9@cs.huji.ac.il> References: <EC4DB495-55D0-44BB-8D6A-0301785FADC7@cs.huji.ac.il> <9cded04a-9ae1-881e-3962-7ef0322e96ed@grosbein.net> <2AD912BF-97B0-421D-B561-722D74864DC9@cs.huji.ac.il>
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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.
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