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I tried to migrate problem VM (only one on problem node) again and it freezes forever with such node log: VM is become irresponsible and I have to stop migration and restart VM. After that, it runs fine and live-migrated successfully.

If I understand QemuMigrate.pm/QemuServer.pm correctly, observed symptoms can only be observed when "failed"/"cancelled" has been read from VM's communication socket (/var/run/qemu-server/VMID.qmp). This is very strange, because I have no qemu-guest-agent in VM's and, moreover, no "Qemu agent"...

Ok, next round. VM from next node doesn't migrate with same symptoms: both source and target nodes have similar packages (after yesterday qemu-server update): How to resolve this problem? (I think I can reboot VM to "fix" live migrate, but it is definitely a kludge :))

How can I prevent/debug such situation in future? It is not first occurence of problem.

Hm... shutdowning/starting all VMs on one node makes live migration works again (for those VMs). How I suppose to debug it? Seems like it is no migrations logs anywhere...

Same problem here. I installed updated qemu-server deb on all nodes, but this has no effect.