From owner-freebsd-current@FreeBSD.ORG  Mon Oct 20 10:37:15 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
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 0630E16A4B3
	for <current@freebsd.org>; Mon, 20 Oct 2003 10:37:15 -0700 (PDT)
Received: from obsecurity.dyndns.org
	(adsl-63-207-60-234.dsl.lsan03.pacbell.net [63.207.60.234])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 355D343F93
	for <current@freebsd.org>; Mon, 20 Oct 2003 10:37:12 -0700 (PDT)
	(envelope-from kris@obsecurity.org)
Received: from rot13.obsecurity.org (rot13.obsecurity.org [10.0.0.5])
	by obsecurity.dyndns.org (Postfix) with ESMTP
	id B75C466D80; Mon, 20 Oct 2003 10:37:00 -0700 (PDT)
Received: by rot13.obsecurity.org (Postfix, from userid 1000)
	id AB77C4F5; Mon, 20 Oct 2003 10:37:00 -0700 (PDT)
Date: Mon, 20 Oct 2003 10:37:00 -0700
From: Kris Kennaway <kris@obsecurity.org>
To: Paolo Pisati <flag@oltrelinux.com>
Message-ID: <20031020173700.GA59841@rot13.obsecurity.org>
References: <20031020171519.GA40589@southcross.skynet.org>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="rwEMma7ioTxnRzrJ"
Content-Disposition: inline
In-Reply-To: <20031020171519.GA40589@southcross.skynet.org>
User-Agent: Mutt/1.4.1i
cc: current@freebsd.org
Subject: Re: pcm & exclusive sleep mutex with Oct19 CURRENT
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/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: Mon, 20 Oct 2003 17:37:15 -0000


--rwEMma7ioTxnRzrJ
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Oct 20, 2003 at 07:15:19PM +0200, Paolo Pisati wrote:
>=20
> from my dmesg:
> [snip]
> pcm0: <ESS Technology Allegro-1> port 0xb800-0xb8ff irq 5 at device 1.0 o=
n pci2
> pcm0: failed to enable memory mapping!
> pcm0: <ESS Technology ES1988 AC97 Codec>
> malloc() of "64" with the following non-sleepable locks held:
> exclusive sleep mutex pcm0:mixer (pcm mixer) r =3D 0 (0xc2d34540) locked =
@ /usr/src/sys/dev/sound/pcm/mixer.c:322

Unfortunately none of the sound developers have been interested in
looking at the locking problems in the code.

> acquiring duplicate lock of same type: "pcm channel"
>  1st pcm0:record:0 @ /usr/src/sys/dev/sound/pcm/sound.c:195
>  2nd pcm0:play:0 @ /usr/src/sys/dev/sound/pcm/sound.c:195
> Stack backtrace:
>=20
> with no backtrace at all.

FWIW, the backtrace would have been reported on the system console.

Kris

--rwEMma7ioTxnRzrJ
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (FreeBSD)

iD8DBQE/lB08Wry0BWjoQKURAv6FAKDmr9S/1tTHpaH5sSmRXjqMNkfEaQCeIRVi
qfWcxaZmNa0JMHhQ+HA0tmI=
=AVw6
-----END PGP SIGNATURE-----

--rwEMma7ioTxnRzrJ--