KVM Compute cluster node unresponsive hung

I have Centos 7 latest updated version. I use KVM as hypervisor and Opennebula as manager. Storage subsystem is FiberChannel LUN for system and also second SHARED LUN for guest images. I use pacemaker with cLVM. Today one of three nodes partially freeze and I cannot log using ssh. So I shutdown manually each VM and fence node. Before fencing I look via remote kvm on screen and I saw many kernel errors with hung tasks, look on attached screenshot. I dont know what causes error. Network? Storage? I also enable kernel logging to file, so if it repeat in future I will have more log messages. Would you please look on that screenshot and try to help me? Thank you very much.