Index: head/sys/netinet/ip_carp.c
===================================================================
--- head/sys/netinet/ip_carp.c
+++ head/sys/netinet/ip_carp.c
@@ -218,19 +218,22 @@
 static int carp_dscp_sysctl(SYSCTL_HANDLER_ARGS);
 static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS);
 
-SYSCTL_NODE(_net_inet, IPPROTO_CARP,	carp,	CTLFLAG_RW, 0,	"CARP");
+SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+    "CARP");
 SYSCTL_PROC(_net_inet_carp, OID_AUTO, allow,
-    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 0, 0, carp_allow_sysctl, "I",
+    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+    0, 0, carp_allow_sysctl, "I",
     "Accept incoming CARP packets");
 SYSCTL_PROC(_net_inet_carp, OID_AUTO, dscp,
-    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, 0, 0, carp_dscp_sysctl, "I",
+    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+    0, 0, carp_dscp_sysctl, "I",
     "DSCP value for carp packets");
 SYSCTL_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_VNET | CTLFLAG_RW,
     &VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode");
 SYSCTL_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_VNET | CTLFLAG_RW,
     &VNET_NAME(carp_log), 0, "CARP log level");
 SYSCTL_PROC(_net_inet_carp, OID_AUTO, demotion,
-    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
+    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
     0, 0, carp_demote_adj_sysctl, "I",
     "Adjust demotion factor (skew of advskew)");
 SYSCTL_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor,
Index: head/sys/netpfil/pf/if_pfsync.c
===================================================================
--- head/sys/netpfil/pf/if_pfsync.c
+++ head/sys/netpfil/pf/if_pfsync.c
@@ -273,7 +273,8 @@
 
 static unsigned long pfsync_buckets;
 
-SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW, 0, "PFSYNC");
+SYSCTL_NODE(_net, OID_AUTO, pfsync, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+    "PFSYNC");
 SYSCTL_STRUCT(_net_pfsync, OID_AUTO, stats, CTLFLAG_VNET | CTLFLAG_RW,
     &VNET_NAME(pfsyncstats), pfsyncstats,
     "PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
Index: head/sys/netpfil/pf/pf.c
===================================================================
--- head/sys/netpfil/pf/pf.c
+++ head/sys/netpfil/pf/pf.c
@@ -369,7 +369,8 @@
 VNET_DEFINE(struct pf_idhash *, pf_idhash);
 VNET_DEFINE(struct pf_srchash *, pf_srchash);
 
-SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW, 0, "pf(4)");
+SYSCTL_NODE(_net, OID_AUTO, pf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+    "pf(4)");
 
 u_long	pf_hashmask;
 u_long	pf_srchashmask;