Eric, please double check my merge work for net/ipv4/udp.c In net we fixed a soreuseport bug that added a hlist_nulls_add_tail_rcu() call to net/ipv4/udp.c
And in net-next you converted UDP sockets away from nulls lists. Therefore I had to add a hlist_add_tail_rcu() implementation to linux/rculist.h and use it in net/ipv4/udp.c Please make sure this is fine and will work safely. Thanks!