From owner-freebsd-hackers@freebsd.org Thu Nov 14 14:53:04 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 661191AA0B7 for ; Thu, 14 Nov 2019 14:53:04 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) Received: from kabab.cs.huji.ac.il (kabab.cs.huji.ac.il [132.65.116.210]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47DPby5M2Bz4Cjr for ; Thu, 14 Nov 2019 14:53:02 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=cs.huji.ac.il; s=57791128; h=To:Date:Message-Id:Subject:Mime-Version:Content-Transfer-Encoding:Content-Type:From; bh=02OF62eTAA/XX2bF/3XjT0vFP51ijkeWkTVlqO6iDQ4=; b=mXaOjpQWf0Y6nYu3Ob7QIq119CwbnAPwjHLNTxwc4j4yoPUveLUgrSHPCiL7Rbv0GDUPdbShzwzrGKtNfrY9kS0amFtrL7Ssu2U6jbfVGjCsFSPIDzUKq2HBc45fIdXBpb/zXNH1WXJElNiJaySoub/jt4y81GXDJ+rwv8dOcf95Xf/qtiq6h0cIXL1a8iXcU6+d/5AjvLqPGY8L1/LtXD2Hy+T7CVh7FTwneREXqMdm/iFRo2y/djDwa3FJxCTKtD05B2Po/MZckpSFPn0BZ0zmjdXyRFWP9QsNiECtNUNo1KkkeNWzXVgqfSLgjxGFy/vI83B4qWazZBtRqyts5A==; Received: from macmini.bk.cs.huji.ac.il ([132.65.179.19]) by kabab.cs.huji.ac.il with esmtp id 1iVGUV-000B1A-46 for freebsd-hackers@freebsd.org; Thu, 14 Nov 2019 16:52:59 +0200 From: Daniel Braniss Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3601.0.10\)) Subject: can the hardware watchdog reboot a hung kernel? Message-Id: Date: Thu, 14 Nov 2019 16:52:57 +0200 To: freebsd-hackers X-Mailer: Apple Mail (2.3601.0.10) X-Rspamd-Queue-Id: 47DPby5M2Bz4Cjr X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=cs.huji.ac.il header.s=57791128 header.b=mXaOjpQW; dmarc=pass (policy=none) header.from=huji.ac.il; spf=none (mx1.freebsd.org: domain of danny@cs.huji.ac.il has no SPF policy when checking 132.65.116.210) smtp.mailfrom=danny@cs.huji.ac.il X-Spamd-Result: default: False [-1.99 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.994,0]; R_DKIM_ALLOW(-0.20)[cs.huji.ac.il:s=57791128]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; RCPT_COUNT_ONE(0.00)[1]; IP_SCORE(-0.70)[ip: (-1.40), ipnet: 132.64.0.0/13(-1.20), asn: 378(-0.96), country: IL(0.05)]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[cs.huji.ac.il:+]; DMARC_POLICY_ALLOW(-0.50)[huji.ac.il,none]; RCVD_IN_DNSWL_NONE(0.00)[210.116.65.132.list.dnswl.org : 127.0.10.0]; R_SPF_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:378, ipnet:132.64.0.0/13, country:IL]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] 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 14:53:04 -0000 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=20 wishful thinking? cheers, danny