Date: Thu, 14 Nov 2019 17:35:06 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: Eugene Grosbein <eugen@grosbein.net> Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: can the hardware watchdog reboot a hung kernel? Message-ID: <2AD912BF-97B0-421D-B561-722D74864DC9@cs.huji.ac.il> In-Reply-To: <9cded04a-9ae1-881e-3962-7ef0322e96ed@grosbein.net> References: <EC4DB495-55D0-44BB-8D6A-0301785FADC7@cs.huji.ac.il> <9cded04a-9ae1-881e-3962-7ef0322e96ed@grosbein.net>
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> On 14 Nov 2019, at 17:28, Eugene Grosbein <eugen@grosbein.net> wrote: >=20 > 14.11.2019 21:52, Daniel Braniss wrote: >=20 >> hi, >> I have serveral hundred Nano-pi NEO running, and sometimes they hang, = since there is no console >> available, the only solution is to do a power cycle - not so easy = since they are distributed in three buildings :-) >>=20 >> I am looking at the watchdog stuff, but it seems that what I want is = not supported, i.e. >> reboot the kernel when hung=20 >>=20 >> wishful thinking? >=20 > 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. >=20 yes, but it relys on user land, what if the kernel is hung?=20
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