LU-4606 has introduced some packaging changes and particularly one that causes a lib/dso to be shipped inside each of the lustre-osd RPMs.
This breaks current packaging of Lustre Server DKMS RPM which presently builds and provides the osd module but also conflicts with the lustre-osd package!
This leads to the Lustre Server DKMS RPM to be unusable due to the necessary lib/dso for the mount command not to be installed.