From owner-freebsd-hackers@FreeBSD.ORG  Wed Aug  7 09:13:38 2013
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 69DB1488
 for <hackers@freebsd.org>; Wed,  7 Aug 2013 09:13:38 +0000 (UTC)
 (envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl
 [188.252.31.196])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id D646527C7
 for <hackers@freebsd.org>; Wed,  7 Aug 2013 09:13:37 +0000 (UTC)
Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1])
 by wojtek.tensor.gdynia.pl (8.14.7/8.14.7) with ESMTP id r778uoXB001203;
 Wed, 7 Aug 2013 10:56:50 +0200 (CEST)
 (envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
 by wojtek.tensor.gdynia.pl (8.14.7/8.14.7/Submit) with ESMTP id r778unrr001200;
 Wed, 7 Aug 2013 10:56:50 +0200 (CEST)
 (envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Wed, 7 Aug 2013 10:56:49 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Yuri <yuri@rawbw.com>
Subject: Re: After the FreeBSD VM crash, file system in VM got rolled back
 to some old previous state causing data loss
In-Reply-To: <51FC65DF.2090606@rawbw.com>
Message-ID: <alpine.BSF.2.00.1308071055560.1199@wojtek.tensor.gdynia.pl>
References: <51FC65DF.2090606@rawbw.com>
User-Agent: Alpine 2.00 (BSF 1167 2008-08-23)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.4.3
 (wojtek.tensor.gdynia.pl [127.0.0.1]); Wed, 07 Aug 2013 10:56:50 +0200 (CEST)
Cc: FreeBSD Hackers <hackers@freebsd.org>
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/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: Wed, 07 Aug 2013 09:13:38 -0000

> I hit this unexpected problem: my host had an ungraceful shutdown while 
> FreeBSD 9.1 STABLE was running in the VirtualBox VM. After reboot of the host 
> and VM, local ufs file system was missing all recent updates for at least 20 
> hours (!!!)
> My question is, how is this possible? Is this related to journaled 
> soft-updates which were enabled in VM?

not possible in FreeBSD with UFS.

but if you run virtualbox under linux i cannot say much...