From owner-freebsd-hackers@freebsd.org  Fri Nov  6 21:58:08 2015
Return-Path: <owner-freebsd-hackers@freebsd.org>
Delivered-To: freebsd-hackers@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 CD8CAA287AB;
 Fri,  6 Nov 2015 21:58:08 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
 by mx1.freebsd.org (Postfix) with ESMTP id DE04E18C7;
 Fri,  6 Nov 2015 21:58:07 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua
 [212.40.38.100])
 by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id XAA01639;
 Fri, 06 Nov 2015 23:58:06 +0200 (EET) (envelope-from avg@FreeBSD.org)
Received: from localhost ([127.0.0.1])
 by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
 id 1Zup1J-0008NI-SQ; Fri, 06 Nov 2015 23:58:05 +0200
Subject: Re: strange kernel crash
To: Hans Petter Selasky <hps@selasky.org>,
 FreeBSD Current <freebsd-current@FreeBSD.org>,
 FreeBSD Hackers <freebsd-hackers@FreeBSD.org>
References: <563C8CED.3020101@FreeBSD.org> <563CEB53.50909@selasky.org>
From: Andriy Gapon <avg@FreeBSD.org>
Message-ID: <563D2236.4030708@FreeBSD.org>
Date: Fri, 6 Nov 2015 23:57:10 +0200
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101
 Thunderbird/38.3.0
MIME-Version: 1.0
In-Reply-To: <563CEB53.50909@selasky.org>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 06 Nov 2015 21:58:08 -0000

On 06/11/2015 20:02, Hans Petter Selasky wrote:
> On 11/06/15 12:20, Andriy Gapon wrote:
>> Now the strange part:
>>
>>     0xffffffff80619a18 <+744>:   jne    0xffffffff80619a61 <__mtx_lock_flags+817>
>>     0xffffffff80619a1a <+746>:   mov    %rbx,(%rsp)
>> => 0xffffffff80619a1e <+750>:   movq   $0x0,0x18(%rsp)
>>     0xffffffff80619a27 <+759>:   movq   $0x0,0x10(%rsp)
>>     0xffffffff80619a30 <+768>:   movq   $0x0,0x8(%rsp)
> 
> Were these instructions dumped from RAM or from the kernel ELF file?

Whatever minidump and kgdb (libkvm) do for the text section.
Just in case, in addition to 'disassemble' I also did this:

(kgdb) x/i 0xffffffff80619a1e
=> 0xffffffff80619a1e <__mtx_lock_flags+750>:   movq   $0x0,0x18(%rsp)


-- 
Andriy Gapon