From owner-freebsd-fs@FreeBSD.ORG  Fri Jul 13 15:07:10 2012
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1300B106566B
	for <freebsd-fs@freebsd.org>; Fri, 13 Jul 2012 15:07:10 +0000 (UTC)
	(envelope-from freebsd-listen@fabiankeil.de)
Received: from smtprelay01.ispgateway.de (smtprelay01.ispgateway.de
	[80.67.29.23]) by mx1.freebsd.org (Postfix) with ESMTP id C10708FC08
	for <freebsd-fs@freebsd.org>; Fri, 13 Jul 2012 15:07:09 +0000 (UTC)
Received: from [78.35.148.244] (helo=fabiankeil.de)
	by smtprelay01.ispgateway.de with esmtpsa (TLSv1:AES128-SHA:128)
	(Exim 4.68) (envelope-from <freebsd-listen@fabiankeil.de>)
	id 1SphS0-0008An-4F; Fri, 13 Jul 2012 17:06:36 +0200
Date: Fri, 13 Jul 2012 17:06:32 +0200
From: Fabian Keil <freebsd-listen@fabiankeil.de>
To: Lytochkin Boris <lytboris@gmail.com>
Message-ID: <20120713170632.065e650e@fabiankeil.de>
In-Reply-To: <CAEJYa-RFuJKTOd3_Ykj3Z8KYPuYoQUwiwOr5i37C0FeZ2MUsvw@mail.gmail.com>
References: <1341864787.32803.43.camel@btw.pki2.com>
	<20120712151541.7f3a6886@fabiankeil.de>
	<CAEJYa-RFuJKTOd3_Ykj3Z8KYPuYoQUwiwOr5i37C0FeZ2MUsvw@mail.gmail.com>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=PGP-SHA1;
	boundary="Sig_/nBRIgBzrnRkWba/7Gs/6f6v";
	protocol="application/pgp-signature"
X-Df-Sender: Nzc1MDY3
Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS hanging
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: freebsd-fs@freebsd.org
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 13 Jul 2012 15:07:10 -0000

--Sig_/nBRIgBzrnRkWba/7Gs/6f6v
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

Lytochkin Boris <lytboris@gmail.com> wrote:

> On Thu, Jul 12, 2012 at 5:15 PM, Fabian Keil
> <freebsd-listen@fabiankeil.de> wrote:
> > fk@r500 ~ $zpool status
> > load: 0.15  cmd: zpool 2698 [spa_namespace_lock] 543.23r 0.00u 0.12s 0%=
 2908k
>=20
> This sounds familiar with http://www.freebsd.org/cgi/query-pr.cgi?pr=3D16=
3770
> Try playing with kern.maxvnodes.

Thanks for the suggestion, but the system is my laptop and I already
set kern.maxvnodes=3D400000 which I suspect is more than I'll ever need.

Currently I uses less than a tenth of this, but I'll keep an eye on
it the next time the issue occurs.

I usually reach this deadlock after losing the vdev in a single-vdev pool.
My suspicion is that the deadlock is caused by some kind of "failure to
communicate" between ZFS and the various geom layers involved.

I already know that losing vdevs with the pool configuration I use
can cause http://www.freebsd.org/cgi/query-pr.cgi?pr=3Dkern/162010
and http://www.freebsd.org/cgi/query-pr.cgi?pr=3Dkern/162036 and I
suspect that the deadlock is just another symptom of the same issue.

Fabian

--Sig_/nBRIgBzrnRkWba/7Gs/6f6v
Content-Type: application/pgp-signature; name=signature.asc
Content-Disposition: attachment; filename=signature.asc

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (FreeBSD)

iEYEARECAAYFAlAAOXsACgkQBYqIVf93VJ0LYgCeNmcExneJ+80TvbWRkT4lJCj2
VfkAnjTZ4cFWW9rBh12reXjgvBLu+jzU
=b0B3
-----END PGP SIGNATURE-----

--Sig_/nBRIgBzrnRkWba/7Gs/6f6v--