From owner-freebsd-current@FreeBSD.ORG  Wed Oct  6 22:04:31 2004
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 AC00A16A4CE; Wed,  6 Oct 2004 22:04:31 +0000 (GMT)
Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 3C2CA43D3F; Wed,  6 Oct 2004 22:04:31 +0000 (GMT)
	(envelope-from dan@dan.emsphone.com)
Received: (from dan@localhost)
	by dan.emsphone.com (8.12.11/8.12.11) id i96M4UFn029263;
	Wed, 6 Oct 2004 17:04:30 -0500 (CDT)
	(envelope-from dan)
Date: Wed, 6 Oct 2004 17:04:30 -0500
From: Dan Nelson <dnelson@allantgroup.com>
To: Vlad <marchenko@gmail.com>
Message-ID: <20041006220430.GD3848@dan.emsphone.com>
References: <20041006015131.10116be7.ubm@u-boot-man.de>
	<cd70c68104100517074a5cebf2@mail.gmail.com>
	<20041006090104.06710d85.ubm@u-boot-man.de>
	<20041006154137.GJ47017@green.homeunix.org>
	<20041006203220.7f8e7b8a.ubm@u-boot-man.de>
	<20041006192518.GM47017@green.homeunix.org>
	<cd70c681041006125527e69bcd@mail.gmail.com>
	<20041006202143.GA3848@dan.emsphone.com>
	<cd70c68104100614533d3237e6@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <cd70c68104100614533d3237e6@mail.gmail.com>
X-OS: FreeBSD 5.3-BETA7
X-message-flag: Outlook Error
User-Agent: Mutt/1.5.6i
cc: current@freebsd.org
cc: Marc UBM Bocklet <ubm@u-boot-man.de>
Subject: Re: [BETA7-panic] sodealloc(): so_count 1
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: Wed, 06 Oct 2004 22:04:31 -0000

In the last episode (Oct 06), Vlad said:
> > If you apply the crashdump_compress patch at
> > http://dan.allantgroup.com/FreeBSD/ , you can generate lzop or
> > gzip-compressed dumps.  lzop will let you dump 1GB of ram into 512MB of
> > swap, and gzip will do even better (but is much much slower).
> > 
> 
> I'll try that. One question: does that code has bounds checking
> mechanism, so there will be no data harmed (past swap partition) even
> if compressed dump will be bigger than swap partition?

Yes.  All of the functions that write data end up calling the
dump_write() function, which will fail if an attempt is made to write
outside the dump device. In addition, the code does a preliminary
compress to determine where it should start writing the dump.  If that
size is larger than your dumpdevice, it will print a "Dump failed.
Partition too small." error and won't write to disk at all.

-- 
	Dan Nelson
	dnelson@allantgroup.com