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From
SubjectRe: reproduceable GPF in 2.0.23 with Quota when unmounting /proc
Date
In linux.dev.kernel, article <Pine.LNX.3.95.961026083449.638A-100000@dot.acast.nova.edu>,
Mark Levitt <melevitt@syr.edu> writes:
>
> I'm a little confused about this whole issue. Is there any legitimate
> situation where unmounting /proc would be useful?
>
Yes. For instance, you might want to have an initial (RAM, for now) disk
with a linuxrc program which needs /proc to figure out various sundry
details.

In order to cleanly unmount the RAM disk, nothing may be mounted on top of
it. Hence, umount /proc.

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