From owner-freebsd-mobile  Sun Jun  9 16:46:52 2002
Delivered-To: freebsd-mobile@freebsd.org
Received: from rover.village.org (rover.bsdimp.com [204.144.255.66])
	by hub.freebsd.org (Postfix) with ESMTP
	id EB33537B404; Sun,  9 Jun 2002 16:46:46 -0700 (PDT)
Received: from harmony.village.org (harmony.village.org [10.0.0.6])
	by rover.village.org (8.11.3/8.11.3) with ESMTP id g59NkIY92503;
	Sun, 9 Jun 2002 17:46:18 -0600 (MDT)
	(envelope-from imp@village.org)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.11.6/8.11.6) with ESMTP id g59NkGG17515;
	Sun, 9 Jun 2002 17:46:16 -0600 (MDT)
	(envelope-from imp@village.org)
Date: Sun, 09 Jun 2002 17:45:48 -0600 (MDT)
Message-Id: <20020609.174548.24370471.imp@village.org>
To: jhb@FreeBSD.org
Cc: mobile@FreeBSD.org, morganw@chemikals.org
Subject: Re: newcard panic
From: "M. Warner Losh" <imp@village.org>
In-Reply-To: <XFMail.20020609144943.jhb@FreeBSD.org>
References: <20020609.003037.08625897.imp@village.org>
	<XFMail.20020609144943.jhb@FreeBSD.org>
X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-mobile@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-mobile.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-mobile>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-mobile>
X-Loop: FreeBSD.org

In message: <XFMail.20020609144943.jhb@FreeBSD.org>
            John Baldwin <jhb@FreeBSD.org> writes:
: 
: On 09-Jun-2002 M. Warner Losh wrote:
: > First, I'm assuming that you are doing this against a fairly recent
: > -current,  Please correct me of I'm wrong.
: > 
: >: Fatal trap 12: page fault while in kernel mode
: >: fault virtual address   = 0xdb6c7000
: > 
: > This is a very very odd address to fault at.
: 
: It's a stack address.  Looks like either a stack overrun or underrun.
: 
: >: #11 0xc015efcc in pccard_scan_cis (dev=0xd4b1c800,
: >:     fct=0xc015fe82 <pccard_parse_cis_tuple>, arg=0xd91dcb8c)
: >:     at ../../../dev/pccard/pccard_cis.c:1196
: > 
: > Here's where we get into trouble.  It looks like the Fault is at the
: > return line:
: > 
: > 
: > 1195: return (0);
: > 1196:}
: > 
: > Does that match your sources?
: 
: That would be consistent with a hosed stack.

Yup.  That's what I think too.  I'm going to have to study the code
very closely, since it is evil and the problem subtle.  I suspect that
I'll wind up finding a troublesome card and start to pare out the
hugeness of scan_cis into smaller, more manageable chunks, in addition
to seeing what NetBSD has done in this area.

Warner

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-mobile" in the body of the message