From owner-freebsd-current  Sun Mar 16  0:14:38 2003
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 4EE9637B401; Sun, 16 Mar 2003 00:14:36 -0800 (PST)
Received: from mail.chesapeake.net (chesapeake.net [205.130.220.14])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 7BFAA43FA3; Sun, 16 Mar 2003 00:14:35 -0800 (PST)
	(envelope-from jroberson@chesapeake.net)
Received: from localhost (jroberson@localhost)
	by mail.chesapeake.net (8.11.6/8.11.6) with ESMTP id h2G8EWO76711;
	Sun, 16 Mar 2003 03:14:32 -0500 (EST)
	(envelope-from jroberson@chesapeake.net)
Date: Sun, 16 Mar 2003 03:14:32 -0500 (EST)
From: Jeff Roberson <jroberson@chesapeake.net>
To: Morten Rodal <morten@rodal.no>
Cc: Doug Barton <DougB@FreeBSD.ORG>, Attila Nagy <bra@fsn.hu>,
	<freebsd-current@FreeBSD.ORG>
Subject: Re: kern/49079: panic: bwrite: buffer is not busy
In-Reply-To: <20030316075920.GA5468@slurp.rodal.no>
Message-ID: <20030316031330.O41845-100000@mail.chesapeake.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-current.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-current>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-current>
X-Loop: FreeBSD.ORG

Based on this output from your gdb session it looks like the code in
boot() did run and potentially alter this buffer.

panic: bwrite: buffer is not busy???
panic messages:
---
panic: bwrite: buffer is not busy???
cpuid = 1; lapic.id = 00000000
Stack backtrace:
boot() called on cpu#1

Can you disable sync on panic?  The buf must have been modified.  That
section of code is never entered with b_xflags == 0.  The contents of the
buf just dont make sense with the panic..

Cheers,
Jeff

On Sun, 16 Mar 2003, Morten Rodal wrote:

> On Sun, Mar 16, 2003 at 02:46:13AM -0500, Jeff Roberson wrote:
> > On Sat, 15 Mar 2003, Morten Rodal wrote:
> >
> > > On Fri, Mar 14, 2003 at 06:47:27PM +0100, Morten Rodal wrote:
> > > [snip the parent post]
> > >
> > > I just got another one of these.  This time it didn't double panic
> > > while syncing the disks.  I've been getting this quite often now,
> > > almost daily.  If there is anything else I can help you with to get to
> > > the bottom of this problem don't hesitate to ask.
> > >
> > > Attached is a the gdb output and the backtrace from DDB.
> >
> > Excelent, can you open up the kernel in gdb again.  Then do the following:
> >
> > frame 3
> > print bp
> >
> > With this information I should be able to find the problem.
> >
>
> --
> Morten Rodal
>
>


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