Description of problem: The issue is that when updating a RHEL4 system to the latest kernel up2date fails to rebuild the initrd of the system to include the virt* modules required for the VM to boot correctly. The missing modules required to make initrd correctly boot the system are : --with=virtio_pci --with=virtio_net --with=virtio_blk --with=virtio_ring --with=virtio Version-Release number of selected component (if applicable): 4.9 How reproducible: always Steps to Reproduce: 1.take 4.8, run up2date and get a new kernel 2. 3. Actual results: no boot Expected results: normal boot Additional info: the system is a kvm guest with virtio_blk and virtio_net interfaces