[ovirt-users] VM migration failed after upgrade to 4.4

Hi list, I'm troubleshooting an issue with live migration on an upgrade context. I have a 4.3 cluster that I try to upgrade in 4.4. The engine is OK in 4.4 and I already have upgraded a single host which had kindly reintegrated the cluster. The host is OK. I can start vms on it and migrate vms from it to other hosts. But, if I try to migrate a vm from a 4.3 host to the 4.4 host, it failed with : * on the host : qemu-kvm: terminating on signal 15 from pid XXXX (<unknown process>) * on the engine : VM 'VM_UUID' was unexpectedly detected as 'Down' on VDS 'HOST_UUID' Does anyone here can help me to find what's goning on ? I will be greate regards Joris