I'm running into a situation where I can't unmount a mounted
snapshot. It shows "busy" even though neither lsof nor fuser show any
open files. Umount -f doesn't work although umount -l does.
Is there anything else I can do to debug this scenario or to clear the
busy status myself? Or am I down to rebooting each time?
This is on stock ubuntu-10.04, x86.
--rich
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