Comment 20 for bug 1713490

We just upgraded an OpenStack compute from 16.04.4 to 16.04.5 and live migration is broken for VMs running on a 16.04.4 host to a 16.04.5 host.

We see these error messages in nova-compute.log on a 16.04.4 host:
2019-01-08 07:43:56.117 100671 ERROR nova.virt.libvirt.driver [-] [instance: 3ac1a38d-b3fa-4d02-a94e-b71136bcf07f] Migration operation has aborted
2019-01-08 07:43:56.230 100671 INFO nova.compute.manager [-] [instance: 3ac1a38d-b3fa-4d02-a94e-b71136bcf07f] Swapping old allocation on 61c651ad-62e7-4137-ab35-924cd204ebb9 held by migration
 1368009a-67aa-4574-9ed5-4fb7a513d06e for instance
2019-01-08 07:43:56.311 100671 ERROR nova.virt.libvirt.driver [-] [instance: 3ac1a38d-b3fa-4d02-a94e-b71136bcf07f] Live Migration failure: internal error: qemu unexpectedly closed the monitor
: 2019-01-08T07:43:55.658574Z qemu-system-x86_64: -drive file=rbd:volumes_hdd/volume-08bf868c-23a9-43c5-b00f-91e3dc7e4220:id=cinder:auth_supported=cephx\;none:mon_host=172.16.0.144\:6789\;172
.16.0.145\:6789\;172.16.0.149\:6789,file.password-secret=virtio-disk0-secret0,format=raw,if=none,id=drive-virtio-disk0,serial=08bf868c-23a9-43c5-b00f-91e3dc7e4220,cache=writeback,discard=unma
p: 'serial' is deprecated, please use the corresponding option of '-device' instead
2019-01-08T07:43:55.951328Z qemu-system-x86_64: Length mismatch: 0000:00:03.0/virtio-net-pci.rom: 0x40000 in != 0x80000: Invalid argument
2019-01-08T07:43:55.951350Z qemu-system-x86_64: error while loading state for instance 0x0 of device 'ram'
2019-01-08T07:43:55.951499Z qemu-system-x86_64: load of migration failed: Invalid argument: libvirtError: internal error: qemu unexpectedly closed the monitor: 2019-01-08T07:43:55.658574Z qem
u-system-x86_64: -drive file=rbd:volumes_hdd/volume-08bf868c-23a9-43c5-b00f-91e3dc7e4220:id=cinder:auth_supported=cephx\;none:mon_host=172.16.0.144\:6789\;172.16.0.145\:6789\;172.16.0.149\:67
89,file.password-secret=virtio-disk0-secret0,format=raw,if=none,id=drive-virtio-disk0,serial=08bf868c-23a9-43c5-b00f-91e3dc7e4220,cache=writeback,discard=unmap: 'serial' is deprecated, please
 use the corresponding option of '-device' instead

During the update the package ipxe-qemu was installed in version 1.0.0+git-20180124.fbe8c52d-0ubuntu2.1~cloud0.

As suggested in comment #1 downgrading to 1.0.0+git-20150424.a25a16d-1ubuntu1.2 fixed the problem for us.