From owner-freebsd-stable@FreeBSD.ORG  Wed Oct  6 17:46:44 2010
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 3E62F106566C;
	Wed,  6 Oct 2010 17:46:44 +0000 (UTC) (envelope-from alc@rice.edu)
Received: from mh1.mail.rice.edu (mh1.mail.rice.edu [128.42.201.20])
	by mx1.freebsd.org (Postfix) with ESMTP id 14D648FC0A;
	Wed,  6 Oct 2010 17:46:43 +0000 (UTC)
Received: from mh1.mail.rice.edu (localhost.localdomain [127.0.0.1])
	by mh1.mail.rice.edu (Postfix) with ESMTP id 7B3AA28F79C;
	Wed,  6 Oct 2010 12:46:43 -0500 (CDT)
X-Virus-Scanned: by amavis-2.6.4 at mh1.mail.rice.edu, auth channel
Received: from mh1.mail.rice.edu ([127.0.0.1])
	by mh1.mail.rice.edu (mh1.mail.rice.edu [127.0.0.1]) (amavis,
	port 10026)
	with ESMTP id cMKhnEsdk6xz; Wed,  6 Oct 2010 12:46:43 -0500 (CDT)
Received: from adsl-216-63-78-18.dsl.hstntx.swbell.net
	(adsl-216-63-78-18.dsl.hstntx.swbell.net [216.63.78.18])
	(using TLSv1 with cipher RC4-MD5 (128/128 bits))
	(No client certificate requested) (Authenticated sender: alc)
	by mh1.mail.rice.edu (Postfix) with ESMTPSA id 3775B28F79F;
	Wed,  6 Oct 2010 12:46:42 -0500 (CDT)
Message-ID: <4CACB601.6060205@rice.edu>
Date: Wed, 06 Oct 2010 12:46:41 -0500
From: Alan Cox <alc@rice.edu>
User-Agent: Thunderbird 2.0.0.24 (X11/20100725)
MIME-Version: 1.0
To: Dave Hayes <dave@jetcafe.org>
References: <201010030211.o932Bd4C048116@hugeraid.jetcafe.org>
	<AANLkTikenQoA7UBo_N3bzQJ9ABJSTGL89_Qda_Tu7Wa0@mail.gmail.com>
	<201010040512.o945CTor092854@hugeraid.jetcafe.org>
	<4CAABCFD.6050709@rice.edu>
	<201010050918.o959IR05065727@hugeraid.jetcafe.org>
In-Reply-To: <201010050918.o959IR05065727@hugeraid.jetcafe.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: alc@freebsd.org, freebsd-stable <freebsd-stable@freebsd.org>
Subject: Re: Panic: attempted pmap_enter on 2MB page
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Oct 2010 17:46:44 -0000

Dave Hayes wrote:
> Alan Cox <alc@rice.edu> writes:
>   
[snip]
>> Is this problem reproducible?  I don't recall if you mentioned that
>> earlier.
>>     
>
> Sort of. 
>
> It seems that everytime I generate a bootable FreeBSD ISO, a die is
> rolled.  If it comes up a certain number then it crashes, otherwise it's
> fine. ;)
>
> My ISO generation process might be relevant; I create a 600MB ramdisk
> (it used to be 512 on FreeBSD 7.3) which loads from the ISO on
> boot. This winds up being the root partition. 
>
> As a datapoint the same die roll happens on FreeBSD 7.3 although the
> chance of working seems to be greater. 
>
> If you'd like a copy of the ISO to see this for yourself I can make it
> available. I'm guessing it will also crash for you in this way modulo
> hardware issues. 
>   

When you build your kernel for this ISO are you increasing the value of 
NKPT?

Alan