Date: Tue, 21 Jul 2015 19:17:43 +0000 From: Mark Johnston <markj@FreeBSD.org> To: David Wolfskill <david@catwhisker.org>, Konstantin Belousov <kostikbel@gmail.com>, current@freebsd.org Subject: Re: panic: witness_warn head/amd64 @r285741 on 1 of 2 machines Message-ID: <20150721191743.GA39506@muskytusk> In-Reply-To: <20150721161927.GN1217@albert.catwhisker.org> References: <20150721125734.GF1217@albert.catwhisker.org> <20150721133907.GR2404@kib.kiev.ua> <20150721161927.GN1217@albert.catwhisker.org>
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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
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