From owner-freebsd-hackers@freebsd.org Thu Nov 14 15:24:11 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AFF421AAD60 for ; Thu, 14 Nov 2019 15:24:11 +0000 (UTC) (envelope-from SRS0=11Vf=ZG=quip.cz=000.fbsd@elsa.codelab.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47DQHt4k1nz3M6V for ; Thu, 14 Nov 2019 15:24:10 +0000 (UTC) (envelope-from SRS0=11Vf=ZG=quip.cz=000.fbsd@elsa.codelab.cz) Received: from elsa.codelab.cz (localhost [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id BD0D328416; Thu, 14 Nov 2019 16:24:07 +0100 (CET) Received: from illbsd.quip.test (ip-62-24-92-232.net.upcbroadband.cz [62.24.92.232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id F0CCB28411; Thu, 14 Nov 2019 16:24:06 +0100 (CET) Subject: Re: can the hardware watchdog reboot a hung kernel? To: Daniel Braniss , freebsd-hackers References: From: Miroslav Lachman <000.fbsd@quip.cz> Message-ID: Date: Thu, 14 Nov 2019 16:24:06 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Firefox/52.0 SeaMonkey/2.49.3 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 47DQHt4k1nz3M6V X-Spamd-Bar: +++++ Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of SRS0=11Vf=ZG=quip.cz=000.fbsd@elsa.codelab.cz has no SPF policy when checking 94.124.105.4) smtp.mailfrom=SRS0=11Vf=ZG=quip.cz=000.fbsd@elsa.codelab.cz X-Spamd-Result: default: False [5.08 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; IP_SCORE(0.89)[ip: (0.41), ipnet: 94.124.104.0/21(0.21), asn: 42000(3.76), country: CZ(0.09)]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; DMARC_NA(0.00)[quip.cz]; AUTH_NA(1.00)[]; NEURAL_SPAM_MEDIUM(0.99)[0.986,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[4.105.124.94.list.dnswl.org : 127.0.10.0]; NEURAL_SPAM_LONG(1.00)[0.999,0]; R_SPF_NA(0.00)[]; FORGED_SENDER(0.30)[000.fbsd@quip.cz,SRS0=11Vf=ZG=quip.cz=000.fbsd@elsa.codelab.cz]; MIME_TRACE(0.00)[0:+]; R_DKIM_NA(0.00)[]; ASN(0.00)[asn:42000, ipnet:94.124.104.0/21, country:CZ]; SUBJECT_ENDS_QUESTION(1.00)[]; FROM_NEQ_ENVFROM(0.00)[000.fbsd@quip.cz, SRS0=11Vf=ZG=quip.cz=000.fbsd@elsa.codelab.cz] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Nov 2019 15:24:11 -0000 Daniel Braniss wrote on 2019/11/14 15:52: > 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 :-) > > I am looking at the watchdog stuff, but it seems that what I want is not supported, i.e. > reboot the kernel when hung > > wishful thinking? There is watchdog and watchdogd in base. I never tried it but there are some solutions which need support in BIOS / board where watchdog is communicating with HW and if OS freezes, HW don't get reply from OS and issue reboot after timeout. I don't know if Nano-pi has this support or not. Miroslav Lachman