From owner-freebsd-current@FreeBSD.ORG  Thu Jan 21 17:56:22 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 7D53910656C1
	for <freebsd-current@freebsd.org>; Thu, 21 Jan 2010 17:56:22 +0000 (UTC)
	(envelope-from avg@icyb.net.ua)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id C1A538FC21
	for <freebsd-current@freebsd.org>; Thu, 21 Jan 2010 17:56:21 +0000 (UTC)
Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua
	[212.40.38.101])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id TAA13091;
	Thu, 21 Jan 2010 19:56:16 +0200 (EET) (envelope-from avg@icyb.net.ua)
Message-ID: <4B58953F.10404@icyb.net.ua>
Date: Thu, 21 Jan 2010 19:56:15 +0200
From: Andriy Gapon <avg@icyb.net.ua>
User-Agent: Thunderbird 2.0.0.23 (X11/20091206)
MIME-Version: 1.0
To: David Naylor <naylor.b.david@gmail.com>
References: <201001201543.15818.naylor.b.david@gmail.com>
	<201001201834.48466.naylor.b.david@gmail.com>
	<4B573A8B.8080306@icyb.net.ua>
	<201001211952.20202.naylor.b.david@gmail.com>
In-Reply-To: <201001211952.20202.naylor.b.david@gmail.com>
X-Enigmail-Version: 0.95.7
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: freebsd-current@freebsd.org
Subject: Re: stacked unionfs freeze and crash FreeBSD
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
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: Thu, 21 Jan 2010 17:56:22 -0000

on 21/01/2010 19:52 David Naylor said the following:
> On Wednesday 20 January 2010 19:16:59 Andriy Gapon wrote:
>> Double-fault could indicate stack overflow.
> 
> Thanks, I bumped KSTACK_PAGES to 32 (just to be on the safe side) and it is 
> working fairly well now.  Only crash I have had since was related to tmpfs.  
> So far I have successfully build a port with 59 stacked unionfs (1 rw, 58 ro).  

Good that you found a workaround, bad that there is no better way to handle this
overflow.  Or, is there?

-- 
Andriy Gapon