@laszlobortel Hehe yeah, those are pretty old kernels. I'd say there's a good chance kernel upgrades will go a long way to alleviating the CPU hangs.
I can't say it's exclusively a problem with lvmohba storage, that's just what we use because of our previous VMware infrastructure was block storage over fiber channel. We knew a physical infra overhaul wasn't in the cards for us for this migration so we stayed with our existing storage system. This bug bit us half way through the migration until we figured out upgrading the kernel generally fixed it.