From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kent Overstreet <kent.overstreet@gmail.com>
Subject: Re: [ANNOUNCE] bcachefs!
Date: Fri, 17 Jul 2015 16:17:01 -0700
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To: Ming Lin <mlin@kernel.org>
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On Wed, Jul 15, 2015 at 12:39:36AM -0700, Ming Lin wrote:
> On Wed, Jul 15, 2015 at 12:15 AM, Ming Lin <mlin@kernel.org> wrote:
> > On Tue, 2015-07-14 at 23:58 -0700, Kent Overstreet wrote:
> >> Can you strace it?
> >
> > Strange. Now error message changed.
> 
> I mean sometimes it showed:
> 
> mount: /dev/sdt already mounted or /mnt/ busy

I have no idea what's going on, it works for me - is there anything unusual
about your setup? what kind of block device is /dev/sdt? is there any chance
there's another process that has it open? maybe try rebooting?