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SubjectRe: umount(/proc) after CLONE_NEWNS in 2.6.25?
Al Viro wrote:
> On Tue, Apr 29, 2008 at 03:06:38AM +0100, Al Viro wrote:
>
>>> Check the version of umount(8) you've got. And see if that strace happens
>>> to have open of /proc/mounts, without matching close by the time it calls
>>> umount(). util-linux-ng 2.13.1 is _that_ dumb...
>> Umm... Looks like something more odd is going on...
>
> ... or something much simpler:
>
> ; cat /proc/mounts |grep proc
> proc /proc proc rw,nosuid,nodev,noexec 0 0
> usbfs /proc/bus/usb usbfs rw 0 0
> ;
>
> and unmounting the stuff mounted under /proc before doing umount /proc
> works as expected. Amazing how well the first cup of coffee helps...

Hey. Don't paint ME *that* dumb... ;)

It was indeed the case here. I never tried those things on my
home machine before, and decided to experiment, but I forgot
that it has /proc/bus/usb mounted. And for comparison I used
another machine which does NOT have that filesystem mounted.
How.. dum^Wodd... ;)

Please excuse me for the noise.

/mj


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