From owner-freebsd-current@freebsd.org Tue Jul 21 19:18:55 2015 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 15EE99A7745 for ; Tue, 21 Jul 2015 19:18:55 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id E899D1489 for ; Tue, 21 Jul 2015 19:18:54 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by mailman.ysv.freebsd.org (Postfix) id DE45F9A7744; Tue, 21 Jul 2015 19:18:54 +0000 (UTC) Delivered-To: current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DCD189A7743 for ; Tue, 21 Jul 2015 19:18:54 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-qk0-x22a.google.com (mail-qk0-x22a.google.com [IPv6:2607:f8b0:400d:c09::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7715E1488 for ; Tue, 21 Jul 2015 19:18:54 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by qkfc129 with SMTP id c129so96826294qkf.1 for ; Tue, 21 Jul 2015 12:18:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:date:from:to:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=CHHLRwSB3NsC8ra8ftNdeqCj250gYTjmTEC2q1jmZPI=; b=EVmvr5/yf74IoY7mae82oVJmqIdjcrTYNtgXa79/Sc7HxUzupUdD3iQ3Ip0mEL1vC2 wSQ2vZ8wNlL2YrWM+lGDmoYppZ4b2flc4SHa7DwD06tqnUunqCVwsviCVZPotzwfEPhU ae1wuV0dw4OxKO6/lVUV4lQN6GHIVleWbqpBWenpNCUozl5l8AkP8VmDoL4v7Ct7iMnk cH0nMwfSEhGpE0fhm2KMtyfcwb4iDi7iolVWfn0sel9a9EgRKIHpIZjHth/wJVvKIsQI gzzR6DdFu7BvDAhzJpqVeeV8Dwpcx0c5iPWf2B42yQwtl4suHB7YKu2dIgB34dyNulxg 6k/Q== X-Received: by 10.55.31.31 with SMTP id f31mr56003105qkf.88.1437506333001; Tue, 21 Jul 2015 12:18:53 -0700 (PDT) Received: from muskytusk ([104.236.250.12]) by smtp.gmail.com with ESMTPSA id f106sm13251026qgd.30.2015.07.21.12.18.51 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Jul 2015 12:18:52 -0700 (PDT) Sender: Mark Johnston Date: Tue, 21 Jul 2015 19:17:43 +0000 From: Mark Johnston To: David Wolfskill , Konstantin Belousov , current@freebsd.org Subject: Re: panic: witness_warn head/amd64 @r285741 on 1 of 2 machines Message-ID: <20150721191743.GA39506@muskytusk> References: <20150721125734.GF1217@albert.catwhisker.org> <20150721133907.GR2404@kib.kiev.ua> <20150721161927.GN1217@albert.catwhisker.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150721161927.GN1217@albert.catwhisker.org> User-Agent: Mutt/1.5.23 (2014-03-12) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Jul 2015 19:18:55 -0000 On Tue, Jul 21, 2015 at 09:19:27AM -0700, David Wolfskill wrote: > On Tue, Jul 21, 2015 at 04:39:07PM +0300, Konstantin Belousov wrote: > > On Tue, Jul 21, 2015 at 05:57:34AM -0700, David Wolfskill wrote: > > > My laptop had no problems, but the build machine has a panic that > > > appears quite reproducible (4 "successes" out of 4 tries); here's a bit > > > from the core.txt file: > > > > There must be kernel messages before the panic string. They are crusial > > to understand what is going on. > > ... > > Sorry I wasn't able to capture those before I needed to do Other Things. > > The machine had a (PCI-attached) serial console that was working > for FreeBSD (thanks mostly to sbruno's help), but Somthing seems > to Have Happened, and that's not presently working (even in stable/10, > where I first got it working). > > I will try to get it working again, but I doubt I will have time to > focus on that until about 9 hours from now. It's possible to extract log messages leading up to the panic from the vmcore. From the kgdb prompt, running (kgdb) printf "%s", msgbufp->msg_ptr should bring them up. And, I just noticed that you posted the core.txt, which contains this info near the end: http://www.catwhisker.org/~david/FreeBSD/head/core.txt.1