From owner-freebsd-fs@FreeBSD.ORG Mon May 21 20:33:05 2007 Return-Path: X-Original-To: freebsd-fs@freebsd.org Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id C08C416A4D7 for ; Mon, 21 May 2007 20:33:05 +0000 (UTC) (envelope-from rick@kiwi-computer.com) Received: from kiwi-computer.com (keira.kiwi-computer.com [63.224.10.3]) by mx1.freebsd.org (Postfix) with SMTP id 4BD9713C46A for ; Mon, 21 May 2007 20:33:05 +0000 (UTC) (envelope-from rick@kiwi-computer.com) Received: (qmail 84546 invoked by uid 2001); 21 May 2007 20:35:56 -0000 Date: Mon, 21 May 2007 15:35:56 -0500 From: "Rick C. Petty" To: Kris Kennaway Message-ID: <20070521203556.GA84210@keira.kiwi-computer.com> References: <475187.33232.qm@web63006.mail.re1.yahoo.com> <4651F897.9010201@infidyne.com> <20070521195634.GA80608@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070521195634.GA80608@xor.obsecurity.org> User-Agent: Mutt/1.4.2.1i Cc: freebsd-fs@freebsd.org Subject: Re: VERY frustrated with FreeBSD/UFS stability - please help or comment... X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: rick-freebsd@kiwi-computer.com List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 May 2007 20:33:05 -0000 On Mon, May 21, 2007 at 03:56:34PM -0400, Kris Kennaway wrote: > > > > The one thing I *have* experienced is filesystems going nuts after > > filling them. Specifically I end up with a negative amount of space > > free, and as soon as you release more space df -h quickly reports the > > amount of free space dropping (you can see it interactively churning for > > a few secs) until it settles at some negative amount again and you're > > back to square one. This has happened once or twice in the past, but not > > recently. Not sure which release it did happen on; might have been 5.x. > > Yeah, this was an old bug in the 5.x timeframe. As far as I recall it > was fixed at some point in the past. Hmm, this recently happened to me in 6.2-STABLE. I was unable to replicate it so filing a PR was pointless. What I saw happen was that /usr filled up completely (I caught it before it hit 100% full, but watched helplessly as it switched from time to space optimization). I even did a "du -hd0 /usr" and saw it only using about 20% of the file system. lsof and fstat weren't terribly helpful. After shutting down to single-user mode, I saw it full even though I deleted a lot of superfluous files, and du/df differences were still present. I restarted and fsck cleaned up the 80% "used" space, stating the superblock free maps were incorrect, which explains the discrepency. Why it happened, I'm still baffled. -- Rick C. Petty