RHEL5 Xen guest not booting after DomU patching and reboot

Issue

• Xen guest not booting after DomU kernel 5.9 348.12.1 patching

• Dom0 was updated first to 348.12.1.

• Then a xen guest was update to 348.12.1 and rebooted.

• Below is the error while booting guest

• [root@dom0 ~]# virsh start crazyxenguest
  error: Failed to start domain crazyxenguest
  error: POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: (22, 'Invalid argument')")