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Date: Sun, 30 Mar 2014 09:54:11 +0200 From: Francis Moreau <francis.moro@...il.com> To: LKML <linux-kernel@...r.kernel.org> Subject: Re: Can't umount /mnt/dev after calling dd(1) and with /mnt/dev is a bind mount up On 03/22/2014 05:52 PM, Francis Moreau wrote: > Hello, > > 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" > > I tried to see if any processes were still using a file in dev with > fuser(1) but there weren't. Futhermore inserting a call to fuser(1) > right before umount fixed the issue, so it really seems a timing issue. > > stracing umount showed that umount failed here: > umount("/mnt/dev", 0) = -1 EBUSY (Device or resource busy) > > I replaced the bind mount of /dev by: > mount -t devtmpfs none /mnt/dev > and it worked. > > Could anybody tell me what I'm doing wrong ? > > Thanks. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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