From owner-freebsd-current@FreeBSD.ORG  Wed Nov 27 09:13:49 2013
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 6D16A5EE
 for <freebsd-current@FreeBSD.org>; Wed, 27 Nov 2013 09:13:49 +0000 (UTC)
Received: from gw.catspoiler.org (gw.catspoiler.org [75.1.14.242])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id 3AB4F2261
 for <freebsd-current@FreeBSD.org>; Wed, 27 Nov 2013 09:13:49 +0000 (UTC)
Received: from FreeBSD.org (mousie.catspoiler.org [192.168.101.2])
 by gw.catspoiler.org (8.13.3/8.13.3) with ESMTP id rAR9DfeL039290;
 Wed, 27 Nov 2013 01:13:45 -0800 (PST)
 (envelope-from truckman@FreeBSD.org)
Message-Id: <201311270913.rAR9DfeL039290@gw.catspoiler.org>
Date: Wed, 27 Nov 2013 01:13:41 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: panic: double fault with 11.0-CURRENT r258504
To: kostikbel@gmail.com
In-Reply-To: <20131127084800.GV59496@kib.kiev.ua>
MIME-Version: 1.0
Content-Type: TEXT/plain; charset=us-ascii
Cc: freebsd-current@FreeBSD.org
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.16
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 27 Nov 2013 09:13:49 -0000

On 27 Nov, Konstantin Belousov wrote:
> On Wed, Nov 27, 2013 at 12:22:27AM -0800, Don Lewis wrote:
>> It took a while, but I just got another double fault, though this one is
>> somewhat different.  This time it trapped in cpu_switch(), which
>> resulted in calls to
>> trap()->printf()->...->putchar()->msgbuf_addstr()->_mtx_lock_spin_flags()
>> where it trapped again.
>> 
>> Sitting at DDB prompt ...
> 
> Does 'show allpcpu' work ?

Yup.  For both CPUs, curthread == idlethread, both CPUs have the same
curpcb.  What is "dynamic pcpu"?  The values differ considerably between
the two CPUs.