The original bootstrap of the ceph-mon daemon creates /var/lib/ceph/mon/ceph-`hostname` with permissions 0555 - this needs to be 0755; can be fixed during upgrade prior to restarting the daemons.
The original bootstrap of the ceph-mon daemon creates /var/lib/ ceph/mon/ ceph-`hostname` with permissions 0555 - this needs to be 0755; can be fixed during upgrade prior to restarting the daemons.