Comment 9 for bug 1077045

I can't reproduce the problem locally.
Could you double-check (with ceph-osd -v) that every osd is running 0.56.2?

Another possibility is some extraneous character in the caps for client.images.
You can test by using e.g. 'rados --id images -k /patch/to/keyring -p rbd lock list rbd_children'.
If the caps are right, it should say 'No such file or directory' (assuming the rbd_children object doesn't exist in that pool).
Given the error from glance, I'm guessing it'll say 'Operation not permitted' right now.