Index: sys/kern/uipc_socket.c
===================================================================
RCS file: /mount/openbsd/cvs/src/sys/kern/uipc_socket.c,v
diff -u -p -u -p -r1.338 uipc_socket.c
--- sys/kern/uipc_socket.c	14 Jul 2024 15:42:23 -0000	1.338
+++ sys/kern/uipc_socket.c	18 Jul 2024 11:50:54 -0000
@@ -1549,7 +1549,7 @@ somove(struct socket *so, int wait)
 	int		 error = 0, maxreached = 0;
 	unsigned int	 rcvstate;
 
-	soassertlocked(so);
+	soassertlocked_readonly(so);
 
  nextpkt:
 	if (so->so_error) {
Index: sys/netinet/in_proto.c
===================================================================
RCS file: /mount/openbsd/cvs/src/sys/netinet/in_proto.c,v
diff -u -p -u -p -r1.106 in_proto.c
--- sys/netinet/in_proto.c	13 Jul 2024 12:00:11 -0000	1.106
+++ sys/netinet/in_proto.c	18 Jul 2024 11:50:54 -0000
@@ -185,7 +185,7 @@ const struct protosw inetsw[] = {
   .pr_type	= SOCK_DGRAM,
   .pr_domain	= &inetdomain,
   .pr_protocol	= IPPROTO_UDP,
-  .pr_flags	= PR_ATOMIC|PR_ADDR|PR_SPLICE|PR_MPSOCKET,
+  .pr_flags	= PR_ATOMIC|PR_ADDR|PR_SPLICE|PR_MPINPUT|PR_MPSOCKET,
   .pr_input	= udp_input,
   .pr_ctlinput	= udp_ctlinput,
   .pr_ctloutput	= ip_ctloutput,
Index: sys/netinet/udp_usrreq.c
===================================================================
RCS file: /mount/openbsd/cvs/src/sys/netinet/udp_usrreq.c,v
diff -u -p -u -p -r1.321 udp_usrreq.c
--- sys/netinet/udp_usrreq.c	12 Jul 2024 19:50:35 -0000	1.321
+++ sys/netinet/udp_usrreq.c	18 Jul 2024 11:50:54 -0000
@@ -592,7 +592,7 @@ udp_input(struct mbuf **mp, int *offp, i
 	}
 
 	KASSERT(sotoinpcb(inp->inp_socket) == inp);
-	soassertlocked(inp->inp_socket);
+	soassertlocked_readonly(inp->inp_socket);
 
 #ifdef INET6
 	if (ip6 && inp->inp_ip6_minhlim &&
@@ -1207,7 +1207,7 @@ udp_send(struct socket *so, struct mbuf 
 {
 	struct inpcb *inp = sotoinpcb(so);
 
-	soassertlocked(so);
+	soassertlocked_readonly(so);
 
 #ifdef PIPEX
 	if (inp->inp_pipex) {
Index: sys/netinet6/in6_proto.c
===================================================================
RCS file: /mount/openbsd/cvs/src/sys/netinet6/in6_proto.c,v
diff -u -p -u -p -r1.115 in6_proto.c
--- sys/netinet6/in6_proto.c	12 Jul 2024 19:50:35 -0000	1.115
+++ sys/netinet6/in6_proto.c	18 Jul 2024 11:50:54 -0000
@@ -136,7 +136,7 @@ const struct protosw inet6sw[] = {
   .pr_type	= SOCK_DGRAM,
   .pr_domain	= &inet6domain,
   .pr_protocol	= IPPROTO_UDP,
-  .pr_flags	= PR_ATOMIC|PR_ADDR|PR_SPLICE|PR_MPSOCKET,
+  .pr_flags	= PR_ATOMIC|PR_ADDR|PR_SPLICE|PR_MPINPUT|PR_MPSOCKET,
   .pr_input	= udp_input,
   .pr_ctlinput	= udp6_ctlinput,
   .pr_ctloutput	= ip6_ctloutput,