[ovirt-users] Unable to start VM after upgrade vom 4.1.9 to 4.2.1 - NPE

[Jan Siml]

Hello,

>> Enable network and disks on your VM than do:
>> Run -> ONCE Ok Ignore errors. Ok
>> Run
>> Cheeers
> 
> WTF! That worked.
> 
> Did you know, why this works and what happens in the background? Is 
> there a Bugzilla bug ID for this issue?

BTW, here is the list of devices before:

engine=# select type, device, address, is_managed, is_plugged, alias 
from vm_device where vm_id in (select vm_guid from vm_static where 
vm_name='prod-hub-201');
     type    |    device     |                           address 
                    | is_managed | is_plugged |     alias
------------+---------------+--------------------------------------------------------------+------------+------------+----------------
  video      | qxl           | 
                    | t          | t          |
  controller | virtio-scsi   | 
                    | t          | t          |
  balloon    | memballoon    | 
                    | t          | f          | balloon0
  graphics   | spice         | 
                    | t          | t          |
  controller | virtio-serial | {slot=0x06, bus=0x00, domain=0x0000, 
type=pci, function=0x0} | t          | t          | virtio-serial0
  disk       | disk          | {slot=0x07, bus=0x00, domain=0x0000, 
type=pci, function=0x0} | f          | t          | virtio-disk0
  memballoon | memballoon    | {slot=0x08, bus=0x00, domain=0x0000, 
type=pci, function=0x0} | f          | t          | balloon0
  interface  | bridge        | {slot=0x03, bus=0x00, domain=0x0000, 
type=pci, function=0x0} | f          | t          | net0
  interface  | bridge        | {slot=0x09, bus=0x00, domain=0x0000, 
type=pci, function=0x0} | f          | t          | net1
  controller | scsi          | {slot=0x05, bus=0x00, domain=0x0000, 
type=pci, function=0x0} | f          | t          | scsi0
  controller | ide           | {slot=0x01, bus=0x00, domain=0x0000, 
type=pci, function=0x1} | f          | t          | ide
  controller | usb           | {slot=0x01, bus=0x00, domain=0x0000, 
type=pci, function=0x2} | t          | t          | usb
  channel    | unix          | {bus=0, controller=0, type=virtio-serial, 
port=1}            | f          | t          | channel0
  channel    | unix          | {bus=0, controller=0, type=virtio-serial, 
port=2}            | f          | t          | channel1
  channel    | spicevmc      | {bus=0, controller=0, type=virtio-serial, 
port=3}            | f          | t          | channel2
  interface  | bridge        | 
                    | t          | t          | net1
  interface  | bridge        | 
                    | t          | t          | net0
  disk       | cdrom         | 
                    | t          | f          | ide0-1-0
  disk       | cdrom         | {bus=1, controller=0, type=drive, 
target=0, unit=0}          | f          | t          | ide0-1-0
  disk       | disk          | 
                    | t          | t          | virtio-disk0
(20 rows)

and afterwards:

engine=# select type, device, address, is_managed, is_plugged, alias 
from vm_device where vm_id in (select vm_guid from vm_static where 
vm_name='prod-hub-201');
     type    |    device     |                           address 
                    | is_managed | is_plugged |     alias
------------+---------------+--------------------------------------------------------------+------------+------------+----------------
  channel    | spicevmc      | {type=virtio-serial, bus=0, controller=0, 
port=3}            | f          | t          | channel2
  channel    | unix          | {type=virtio-serial, bus=0, controller=0, 
port=1}            | f          | t          | channel0
  interface  | bridge        | {type=pci, slot=0x04, bus=0x00, 
domain=0x0000, function=0x0} | t          | t          | net1
  controller | usb           | {type=pci, slot=0x01, bus=0x00, 
domain=0x0000, function=0x2} | t          | t          | usb
  controller | virtio-serial | {type=pci, slot=0x06, bus=0x00, 
domain=0x0000, function=0x0} | t          | t          | virtio-serial0
  interface  | bridge        | {type=pci, slot=0x03, bus=0x00, 
domain=0x0000, function=0x0} | t          | t          | net0
  controller | virtio-scsi   | {type=pci, slot=0x05, bus=0x00, 
domain=0x0000, function=0x0} | t          | t          | scsi0
  video      | qxl           | {type=pci, slot=0x02, bus=0x00, 
domain=0x0000, function=0x0} | t          | t          | video0
  channel    | unix          | {type=virtio-serial, bus=0, controller=0, 
port=2}            | f          | t          | channel1
  balloon    | memballoon    | 
                    | t          | t          | balloon0
  graphics   | spice         | 
                    | t          | t          |
  disk       | cdrom         | 
                    | t          | f          | ide0-1-0
  disk       | disk          | {type=pci, slot=0x07, bus=0x00, 
domain=0x0000, function=0x0} | t          | t          | virtio-disk0
(13 rows)

Regards

Jan