I've notice a problem with 2.2 kernels when using loopback mount devices.
Specifically, when I unmount, the fs is unmounted and removed from the
/proc/mounts listing, but the underlying fs still reports the old mount
point as being busy and the underlying fs can't be unmounted.
ps: I think the loop device itself is busy too.
User error. Read mount(8) and losetup(8).
Use losetup -d if you use mount/umount in such a way
that the losetup -d is not done automatically.
Do not use a symlink to /proc/mounts as /etc/mtab
if you want mount to do the losetup -d for you.
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