is_stable_node_dup
VM_BUG_ON(is_stable_node_dup(stable_node));
VM_BUG_ON(!is_stable_node_dup(dup));
VM_BUG_ON(is_stable_node_dup(stable_node_dup));
VM_BUG_ON(is_stable_node_dup(stable_node_dup));
VM_BUG_ON(!is_stable_node_dup(stable_node_dup));
VM_BUG_ON(is_stable_node_dup(stable_node));
VM_BUG_ON(!is_stable_node_dup(dup));
VM_BUG_ON(is_stable_node_dup(dup));
VM_BUG_ON(!is_stable_node_dup(dup));
if (is_stable_node_dup(dup))