Re: Can't umount /mnt/dev after calling dd(1) and with /mnt/dev is a bind mount
From: Al Viro
Date: Sat Mar 22 2014 - 15:24:37 EST
On Sat, Mar 22, 2014 at 05:52:24PM +0100, Francis Moreau wrote:
> I'm posting here because it might be a behaviour related to the kernel
> internals that I can't explain from my user point of view :)
> Basically I'm doing this:
> mount -o bind /dev/ /mnt/dev &&
> chroot /mnt dd bs=440 conv=notrunc count=1 if=gptmbr.bin of=/dev/loop0
> umount /mnt/dev
> but umount gives the following error: "umount: /mnt/dev: target is busy"
What do you have in /proc/self/mountinfo before all that?
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