Certainly looks like the kvm module was deadlocked on exit,
Apr 7 11:41:57 userhost kernel: [ 4681.220272] [<ffffffffa04a7b6b>] ? kvm_vcpu_block+0x9b/0xb0 [kvm]
Certainly looks like the kvm module was deadlocked on exit,
Apr 7 11:41:57 userhost kernel: [ 4681.220272] [<ffffffffa04a7 b6b>] ? kvm_vcpu_ block+0x9b/ 0xb0 [kvm]