diff --git a/sys/net/vnet.c b/sys/net/vnet.c
--- a/sys/net/vnet.c
+++ b/sys/net/vnet.c
@@ -536,11 +536,13 @@
 	 * Invoke the constructor on all the existing vnets when it is
 	 * registered.
 	 */
+	VNET_LIST_RLOCK();
 	VNET_FOREACH(vnet) {
 		CURVNET_SET_QUIET(vnet);
 		vs->func(vs->arg);
 		CURVNET_RESTORE();
 	}
+	VNET_LIST_RUNLOCK();
 	VNET_SYSINIT_WUNLOCK();
 }
 
@@ -592,6 +594,7 @@
 	 * deregistered.
 	 */
 	VNET_SYSINIT_WLOCK();
+	VNET_LIST_RLOCK();
 	VNET_FOREACH(vnet) {
 		CURVNET_SET_QUIET(vnet);
 		vs->func(vs->arg);
@@ -601,6 +604,7 @@
 	/* Remove the destructor from the global list of vnet destructors. */
 	TAILQ_REMOVE(&vnet_destructors, vs, link);
 	VNET_SYSINIT_WUNLOCK();
+	VNET_LIST_RUNLOCK();
 }
 
 /*
diff --git a/sys/netinet/ip_reass.c b/sys/netinet/ip_reass.c
--- a/sys/netinet/ip_reass.c
+++ b/sys/netinet/ip_reass.c
@@ -661,11 +661,13 @@
 {
 	VNET_ITERATOR_DECL(vnet_iter);
 
+	VNET_LIST_RLOCK();
 	VNET_FOREACH(vnet_iter) {
 		CURVNET_SET(vnet_iter);
 		ipreass_drain_vnet();
 		CURVNET_RESTORE();
 	}
+	VNET_LIST_RUNLOCK();
 }