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SubjectRe: Strange umount problem in latest 2.4.0 kernels
> The "none" bit puzzles me the most.

It is a common misconfiguration. Given a line

device dir type options garbage

in /etc/fstab, some umount versions will complain "device busy"
when the umount fails. Thus, it is better to use

proc /proc proc
devpts /dev/pts devpts

instead of

none /proc proc
none /dev/pts devpts

so as to avoid this silly "none busy".
But many distributions come misconfigured like this.

These days umount is done by directory, not by device,
since a device may be mounted multiple times, so
I expect the silly message is gone.
(Is your umount recent?)

[But this is only about the "none". I don't know what is
wrong in your situation.]

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