From owner-freebsd-fs  Sun Mar 17 22:23:15 2002
Delivered-To: freebsd-fs@freebsd.org
Received: from obsecurity.dyndns.org (adsl-64-165-226-239.dsl.lsan03.pacbell.net [64.165.226.239])
	by hub.freebsd.org (Postfix) with ESMTP
	id 49C8C37B405; Sun, 17 Mar 2002 22:23:10 -0800 (PST)
Received: by obsecurity.dyndns.org (Postfix, from userid 1000)
	id A83EB66C39; Sun, 17 Mar 2002 22:23:09 -0800 (PST)
Date: Sun, 17 Mar 2002 22:23:09 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: Alfred Perlstein <alfred@freebsd.org>
Cc: Dag-Erling Smorgrav <des@ofug.org>,
	Kris Kennaway <kris@obsecurity.org>, current@freebsd.org,
	fs@freebsd.org
Subject: Re: panic: bwrite: buffer is not busy???
Message-ID: <20020317222309.A45621@xor.obsecurity.org>
References: <20020317124958.A34008@xor.obsecurity.org> <xzpadt6r1xr.fsf@flood.ping.uio.no> <20020318061739.GB894@elvis.mu.org>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-md5;
	protocol="application/pgp-signature"; boundary="y0ulUmNC+osPPQO6"
Content-Disposition: inline
User-Agent: Mutt/1.2.5.1i
In-Reply-To: <20020318061739.GB894@elvis.mu.org>; from alfred@freebsd.org on Sun, Mar 17, 2002 at 10:17:39PM -0800
Sender: owner-freebsd-fs@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-fs.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-fs>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-fs>
X-Loop: FreeBSD.org


--y0ulUmNC+osPPQO6
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Sun, Mar 17, 2002 at 10:17:39PM -0800, Alfred Perlstein wrote:
> * Dag-Erling Smorgrav <des@ofug.org> [020317 19:27] wrote:
> >=20
> > ...the process has no open files at all, because...
> >=20
> > (kgdb) p p->p_pid
> > $4 =3D 10099
> > (kgdb) p p->p_comm
> > $5 =3D "wc\000oot", '\000' <repeats 13 times>
> > (kgdb) p p->p_stat
> > $6 =3D 3
> > (kgdb) p/x p->p_flag
> > $7 =3D 0x6000
> >=20
> > ...it's exiting, and fdfree() has already run.
> >=20
> > Solution: p->p_fd must be protected by p's proc lock; fdfree() must
> > set it to NULL immediately after freeing it; checkdirs() must lock
> > each process before examining its fd list.
> >=20
> > Other problem spotted while investigating this: fdfree() can fail
> > silently; fdfree() should panic if fdp->fd_refcnt is non-zero.
>=20
> Please let me know if this works for you.

Thanks, will test once the current run is finished.

Kris

--y0ulUmNC+osPPQO6
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (FreeBSD)
Comment: For info see http://www.gnupg.org

iD8DBQE8lYfMWry0BWjoQKURApoDAKCn3Ib0V2oR1RbY4Wu3ieIU2QLZkwCgkKOI
Ikv5H3ZG5hRTRAUXigXW4Cc=
=P4xG
-----END PGP SIGNATURE-----

--y0ulUmNC+osPPQO6--

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