From owner-freebsd-questions@FreeBSD.ORG Sun Jul 29 04:09:46 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 3132A16A41A for ; Sun, 29 Jul 2007 04:09:46 +0000 (UTC) (envelope-from modulok@gmail.com) Received: from rv-out-0910.google.com (rv-out-0910.google.com [209.85.198.191]) by mx1.freebsd.org (Postfix) with ESMTP id BFD9313C459 for ; Sun, 29 Jul 2007 04:09:45 +0000 (UTC) (envelope-from modulok@gmail.com) Received: by rv-out-0910.google.com with SMTP id f1so214587rvb for ; Sat, 28 Jul 2007 21:09:45 -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:mime-version:content-type:content-transfer-encoding:content-disposition; b=SrfgDJXDOkW9zYGrW6FmzGAdJD4S+ICKiP1ktczlCKoJhnHqI7SiKr9ZoD1NihsjSq9F9FogNuCg28MT8Ur8kQv3KRMkWFqyrXTPP+b9V4MjnLFIylCC7vaXHuVNOPk5YUXbCfep8j4jBWHYXRU97tyi3IY+Z2HI1k723isrZLE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=rs61PfvfaoE3edohlXqMP1Aus8tE+6hRa347kllch4Gep57r5kU8LarR6Y7JZgESc0t2MHA9BgBRhJ5dHExhZhNdwxRfWjWTxhH1IVagWkC3tUXBRgwxmUF4mfSa2VOc1ZBaQVdXwOANtivCl7jQWckwK+DnBerSwqkj1N61H4w= Received: by 10.141.202.12 with SMTP id e12mr1418114rvq.1185682185489; Sat, 28 Jul 2007 21:09:45 -0700 (PDT) Received: by 10.140.170.12 with HTTP; Sat, 28 Jul 2007 21:09:45 -0700 (PDT) Message-ID: <64c038660707282109v1f846962o8a7d52c4dc4c4fb2@mail.gmail.com> Date: Sat, 28 Jul 2007 22:09:45 -0600 From: Modulok To: freebsd-questions@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Subject: "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 04:09:46 -0000 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? Any pointers would be appreciated. -Modulok-