From owner-freebsd-questions@FreeBSD.ORG Sun Jul 29 20:41:44 2007 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C63F416A41B for ; Sun, 29 Jul 2007 20:41:44 +0000 (UTC) (envelope-from illoai@gmail.com) Received: from nf-out-0910.google.com (nf-out-0910.google.com [64.233.182.188]) by mx1.freebsd.org (Postfix) with ESMTP id 4820D13C480 for ; Sun, 29 Jul 2007 20:41:43 +0000 (UTC) (envelope-from illoai@gmail.com) Received: by nf-out-0910.google.com with SMTP id b2so133579nfb for ; Sun, 29 Jul 2007 13:41:42 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Bp71Je2yNQ9EMcnaxkp0BbngmuFvxM++4/eIWPcJ+g2OMRwxTVzohdw0+eQAcYJpJ3wstfXD4EB0hx0oWLHw3QLXeZxumA5MUKytlv9oqUWuAkwQ29rPm68F435P6i4Vf1mHXXCIlkqbHzTgtmdQxu5Sg5bjdBp2a1D4s8xsS7M= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=VC6RhEekodRI1M2rwBtOoFJ5BHljednhX18B+mPe6Ey+ZozVaQjux67JMaanCI/4+uIJnqnlZIYiMrCn7qMTZU0XTkOeieyAFcP8UyW2xcc+5oRp9kGFbrLWBMNmIygUfD6DHqLrLjmcasQri5uf6Iwq1VEz4+WokPoT6fhKpQc= Received: by 10.82.127.14 with SMTP id z14mr3639008buc.1185741702418; Sun, 29 Jul 2007 13:41:42 -0700 (PDT) Received: by 10.82.185.5 with HTTP; Sun, 29 Jul 2007 13:41:42 -0700 (PDT) Message-ID: Date: Sun, 29 Jul 2007 15:41:42 -0500 From: "illoai@gmail.com" To: Modulok In-Reply-To: <64c038660707282109v1f846962o8a7d52c4dc4c4fb2@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <64c038660707282109v1f846962o8a7d52c4dc4c4fb2@mail.gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: "umount -f" Complete system crash... X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Jul 2007 20:41:44 -0000 On 28/07/07, Modulok wrote: > BACKGROUND > Someone brought me a camera they were having trouble with: winXP > refused to mount the file system. I tried it on FreeBSD 6.1-RELEASE, > "mount_msdosfs /dev/da0s1 /mnt", no problems. I recovered all of their > photos. I attempted to "umount /mnt" and encountered an error, > something along the lines of cannot contact device, (I don't remember > exactly. No, I wasn't in the directory I was attempting to umount.). > No other process was communicating with the device, according to the > camera it was 'idle'. I issued a "umount -f /mnt" command. The entire > system locked up for a few seconds (maybe 4) and then CRASH! I found > myself looking at my BIOS output as the system reboots. > > QUESTIONS > 1. Obviously, why did FreeBSD crash? (More specifically what could > cause a crash in this situation?) > 2. How do I find out, why it crashed? > 3. Did I do something terribly unorthodox to invoke this crash, given > the situation? If so, what could be done different? > The camera powered itself down after being idle for a bit, perhaps? There have been some recent discussions, about physical disconnections of mounted devices causing panics, on this list over the last several weeks. -- --