Using Devstack Icehouse release; Launched Ubuntu VMs, VM came up without any issue and associated floating IP to it. Added required Security group rules and there is no reliability issues to Guest VM.

Then consoled access to Ubuntu VM, gave shutdown, restarted with any issues and able to ping it. But when I did hibernate on Ubuntu VM console, the VM just got stuck and now not able bring it up or communicate with it.

No errors in Nova or neutron log and instance shows active in dashboard.

Any help.

Thanks.