From mboxrd@z Thu Jan  1 00:00:00 1970
From: Miklos Szeredi <miklos@szeredi.hu>
Subject: Re: overlayfs v22 on kernel 3.15.5
Date: Wed, 23 Jul 2014 13:50:07 +0200
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To: Klaus Kreil <klaus.kreil@univie.ac.at>
Cc: linux-unionfs@vger.kernel.org

On Wed, Jul 23, 2014 at 1:48 PM, Miklos Szeredi <miklos@szeredi.hu> wrote:
> On Wed, Jul 23, 2014 at 1:40 PM, Klaus Kreil <klaus.kreil@univie.ac.at> wrote:
>> >
>>> Is there some hint in the dmesg output?
>>>
>> The messag from dmesg reads as follows:
>> [    1.323319] overlayfs: failed to resolve '/.work': -2

You need to give absolute paths:

mount -t overlayfs overlayfs -o
lowerdir=/mnt/root_ro,upperdir=/mnt/root_rw/upper,workdir=/mnt/root_rw/work
/mnt/root

Thanks,
Miklos