Date: Sat, 28 Jul 2007 22:09:45 -0600 From: Modulok <modulok@gmail.com> To: freebsd-questions@freebsd.org Subject: "umount -f" Complete system crash... Message-ID: <64c038660707282109v1f846962o8a7d52c4dc4c4fb2@mail.gmail.com>
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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-
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