From owner-freebsd-hackers@FreeBSD.ORG  Mon Oct  3 06:43:36 2011
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: hackers@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 75937106564A;
	Mon,  3 Oct 2011 06:43:36 +0000 (UTC) (envelope-from lev@FreeBSD.org)
Received: from onlyone.friendlyhosting.spb.ru (onlyone.friendlyhosting.spb.ru
	[IPv6:2a01:4f8:131:60a2::2])
	by mx1.freebsd.org (Postfix) with ESMTP id 123FC8FC0A;
	Mon,  3 Oct 2011 06:43:36 +0000 (UTC)
Received: from lion.home.serebryakov.spb.ru (unknown
	[IPv6:2001:470:923f:1:906c:6af3:5301:18c6])
	(Authenticated sender: lev@serebryakov.spb.ru)
	by onlyone.friendlyhosting.spb.ru (Postfix) with ESMTPA id 58DD74AC1C; 
	Mon,  3 Oct 2011 10:43:34 +0400 (MSD)
Date: Mon, 3 Oct 2011 10:43:27 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD Project
X-Priority: 3 (Normal)
Message-ID: <535056585.20111003104327@serebryakov.spb.ru>
To: Lawrence Stewart <lstewart@freebsd.org>
In-Reply-To: <4E89051D.30908@freebsd.org>
References: <1258376930.20111002193223@serebryakov.spb.ru>
	<4E89051D.30908@freebsd.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=windows-1251
Content-Transfer-Encoding: quoted-printable
Cc: hackers@FreeBSD.org
Subject: Re: alq_open_flags() panics in _mtx_lock_flags()
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: lev@FreeBSD.org
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 03 Oct 2011 06:43:36 -0000

Hello, Lawrence.
You wrote 3 =EE=EA=F2=FF=E1=F0=FF 2011 =E3., 4:43:09:

> I don't see anything obviously wrong with your call to alq_open_flags(),
> other than that I think you want to set your buffer size to be a=20
> multiple of "sizeof(struct g_log_entry)". The small queue size wouldn't
> cause the panic you're seeing though.

> It's hard to draw any real conclusions without seeing your code. Are you
> able to share it?
 As I wrote to current@, fs@ and geom@, it seems, that vnode API could
not be called from geom threads (g_events), at least with topology
lock held. So, it is not ALQ-specific problem, but some mis-interaction
between GEOM and VFS levels.

--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>