diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index a150ff5..84ca171 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -823,6 +823,7 @@ struct ip_vs_app {
 	struct ip_vs_app	*app;		/* its real application */
 	__be16			port;		/* port number in net order */
 	atomic_t		usecnt;		/* usage counter */
+	struct rcu_head		rcu_head;
 
 	/*
 	 * output hook: Process packet in inout direction, diff set for TCP.
@@ -908,7 +909,6 @@ struct netns_ipvs {
 	#define	TCP_APP_TAB_SIZE	(1 << TCP_APP_TAB_BITS)
 	#define	TCP_APP_TAB_MASK	(TCP_APP_TAB_SIZE - 1)
 	struct list_head	tcp_apps[TCP_APP_TAB_SIZE];
-	spinlock_t		tcp_app_lock;
 #endif
 	/* ip_vs_proto_udp */
 #ifdef CONFIG_IP_VS_PROTO_UDP
@@ -916,7 +916,6 @@ struct netns_ipvs {
 	#define	UDP_APP_TAB_SIZE	(1 << UDP_APP_TAB_BITS)
 	#define	UDP_APP_TAB_MASK	(UDP_APP_TAB_SIZE - 1)
 	struct list_head	udp_apps[UDP_APP_TAB_SIZE];
-	spinlock_t		udp_app_lock;
 #endif
 	/* ip_vs_proto_sctp */
 #ifdef CONFIG_IP_VS_PROTO_SCTP
@@ -925,7 +924,6 @@ struct netns_ipvs {
 	#define SCTP_APP_TAB_MASK	(SCTP_APP_TAB_SIZE - 1)
 	/* Hash table for SCTP application incarnations	 */
 	struct list_head	sctp_apps[SCTP_APP_TAB_SIZE];
-	spinlock_t		sctp_app_lock;
 #endif
 	/* ip_vs_conn */
 	atomic_t		conn_count;      /*  connection counter */
diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
index 0b779d7..a956030 100644
--- a/net/netfilter/ipvs/ip_vs_app.c
+++ b/net/netfilter/ipvs/ip_vs_app.c
@@ -58,6 +58,18 @@ static inline void ip_vs_app_put(struct ip_vs_app *app)
 	module_put(app->module);
 }
 
+static void ip_vs_app_inc_destroy(struct ip_vs_app *inc)
+{
+	kfree(inc->timeout_table);
+	kfree(inc);
+}
+
+static void ip_vs_app_inc_rcu_free(struct rcu_head *head)
+{
+	struct ip_vs_app *inc = container_of(head, struct ip_vs_app, rcu_head);
+
+	ip_vs_app_inc_destroy(inc);
+}
 
 /*
  *	Allocate/initialize app incarnation and register it in proto apps.
@@ -106,8 +118,7 @@ ip_vs_app_inc_new(struct net *net, struct ip_vs_app *app, __u16 proto,
 	return 0;
 
   out:
-	kfree(inc->timeout_table);
-	kfree(inc);
+	ip_vs_app_inc_destroy(inc);
 	return ret;
 }
 
@@ -131,8 +142,7 @@ ip_vs_app_inc_release(struct net *net, struct ip_vs_app *inc)
 
 	list_del(&inc->a_list);
 
-	kfree(inc->timeout_table);
-	kfree(inc);
+	call_rcu(&inc->rcu_head, ip_vs_app_inc_rcu_free);
 }
 
 
@@ -144,9 +154,9 @@ int ip_vs_app_inc_get(struct ip_vs_app *inc)
 {
 	int result;
 
-	atomic_inc(&inc->usecnt);
-	if (unlikely((result = ip_vs_app_get(inc->app)) != 1))
-		atomic_dec(&inc->usecnt);
+	result = ip_vs_app_get(inc->app);
+	if (result)
+		atomic_inc(&inc->usecnt);
 	return result;
 }
 
@@ -156,8 +166,8 @@ int ip_vs_app_inc_get(struct ip_vs_app *inc)
  */
 void ip_vs_app_inc_put(struct ip_vs_app *inc)
 {
-	ip_vs_app_put(inc->app);
 	atomic_dec(&inc->usecnt);
+	ip_vs_app_put(inc->app);
 }
 
 
@@ -218,6 +228,7 @@ out_unlock:
 /*
  *	ip_vs_app unregistration routine
  *	We are sure there are no app incarnations attached to services
+ *	Caller should use synchronize_rcu() or rcu_barrier()
  */
 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app)
 {
diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 4f53a5f..7f90825 100644
--- a/net/netfilter/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
@@ -480,6 +480,7 @@ static int __init ip_vs_ftp_init(void)
 	int rv;
 
 	rv = register_pernet_subsys(&ip_vs_ftp_ops);
+	/* rcu_barrier() is called by netns on error */
 	return rv;
 }
 
@@ -489,6 +490,7 @@ static int __init ip_vs_ftp_init(void)
 static void __exit ip_vs_ftp_exit(void)
 {
 	unregister_pernet_subsys(&ip_vs_ftp_ops);
+	/* rcu_barrier() is called by netns */
 }
 
 
diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
index cd1d729..f7190cd 100644
--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
@@ -1016,30 +1016,25 @@ static int sctp_register_app(struct net *net, struct ip_vs_app *inc)
 
 	hash = sctp_app_hashkey(port);
 
-	spin_lock_bh(&ipvs->sctp_app_lock);
 	list_for_each_entry(i, &ipvs->sctp_apps[hash], p_list) {
 		if (i->port == port) {
 			ret = -EEXIST;
 			goto out;
 		}
 	}
-	list_add(&inc->p_list, &ipvs->sctp_apps[hash]);
+	list_add_rcu(&inc->p_list, &ipvs->sctp_apps[hash]);
 	atomic_inc(&pd->appcnt);
 out:
-	spin_unlock_bh(&ipvs->sctp_app_lock);
 
 	return ret;
 }
 
 static void sctp_unregister_app(struct net *net, struct ip_vs_app *inc)
 {
-	struct netns_ipvs *ipvs = net_ipvs(net);
 	struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_SCTP);
 
-	spin_lock_bh(&ipvs->sctp_app_lock);
 	atomic_dec(&pd->appcnt);
-	list_del(&inc->p_list);
-	spin_unlock_bh(&ipvs->sctp_app_lock);
+	list_del_rcu(&inc->p_list);
 }
 
 static int sctp_app_conn_bind(struct ip_vs_conn *cp)
@@ -1055,12 +1050,12 @@ static int sctp_app_conn_bind(struct ip_vs_conn *cp)
 	/* Lookup application incarnations and bind the right one */
 	hash = sctp_app_hashkey(cp->vport);
 
-	spin_lock(&ipvs->sctp_app_lock);
-	list_for_each_entry(inc, &ipvs->sctp_apps[hash], p_list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(inc, &ipvs->sctp_apps[hash], p_list) {
 		if (inc->port == cp->vport) {
 			if (unlikely(!ip_vs_app_inc_get(inc)))
 				break;
-			spin_unlock(&ipvs->sctp_app_lock);
+			rcu_read_unlock();
 
 			IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->"
 					"%s:%u to app %s on port %u\n",
@@ -1076,7 +1071,7 @@ static int sctp_app_conn_bind(struct ip_vs_conn *cp)
 			goto out;
 		}
 	}
-	spin_unlock(&ipvs->sctp_app_lock);
+	rcu_read_unlock();
 out:
 	return result;
 }
@@ -1090,7 +1085,6 @@ static int __ip_vs_sctp_init(struct net *net, struct ip_vs_proto_data *pd)
 	struct netns_ipvs *ipvs = net_ipvs(net);
 
 	ip_vs_init_hash_table(ipvs->sctp_apps, SCTP_APP_TAB_SIZE);
-	spin_lock_init(&ipvs->sctp_app_lock);
 	pd->timeout_table = ip_vs_create_timeout_table((int *)sctp_timeouts,
 							sizeof(sctp_timeouts));
 	if (!pd->timeout_table)
diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c
index 9af653a..0bbc3fe 100644
--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
@@ -580,18 +580,16 @@ static int tcp_register_app(struct net *net, struct ip_vs_app *inc)
 
 	hash = tcp_app_hashkey(port);
 
-	spin_lock_bh(&ipvs->tcp_app_lock);
 	list_for_each_entry(i, &ipvs->tcp_apps[hash], p_list) {
 		if (i->port == port) {
 			ret = -EEXIST;
 			goto out;
 		}
 	}
-	list_add(&inc->p_list, &ipvs->tcp_apps[hash]);
+	list_add_rcu(&inc->p_list, &ipvs->tcp_apps[hash]);
 	atomic_inc(&pd->appcnt);
 
   out:
-	spin_unlock_bh(&ipvs->tcp_app_lock);
 	return ret;
 }
 
@@ -599,13 +597,10 @@ static int tcp_register_app(struct net *net, struct ip_vs_app *inc)
 static void
 tcp_unregister_app(struct net *net, struct ip_vs_app *inc)
 {
-	struct netns_ipvs *ipvs = net_ipvs(net);
 	struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
 
-	spin_lock_bh(&ipvs->tcp_app_lock);
 	atomic_dec(&pd->appcnt);
-	list_del(&inc->p_list);
-	spin_unlock_bh(&ipvs->tcp_app_lock);
+	list_del_rcu(&inc->p_list);
 }
 
 
@@ -624,12 +619,12 @@ tcp_app_conn_bind(struct ip_vs_conn *cp)
 	/* Lookup application incarnations and bind the right one */
 	hash = tcp_app_hashkey(cp->vport);
 
-	spin_lock(&ipvs->tcp_app_lock);
-	list_for_each_entry(inc, &ipvs->tcp_apps[hash], p_list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(inc, &ipvs->tcp_apps[hash], p_list) {
 		if (inc->port == cp->vport) {
 			if (unlikely(!ip_vs_app_inc_get(inc)))
 				break;
-			spin_unlock(&ipvs->tcp_app_lock);
+			rcu_read_unlock();
 
 			IP_VS_DBG_BUF(9, "%s(): Binding conn %s:%u->"
 				      "%s:%u to app %s on port %u\n",
@@ -646,7 +641,7 @@ tcp_app_conn_bind(struct ip_vs_conn *cp)
 			goto out;
 		}
 	}
-	spin_unlock(&ipvs->tcp_app_lock);
+	rcu_read_unlock();
 
   out:
 	return result;
@@ -676,7 +671,6 @@ static int __ip_vs_tcp_init(struct net *net, struct ip_vs_proto_data *pd)
 	struct netns_ipvs *ipvs = net_ipvs(net);
 
 	ip_vs_init_hash_table(ipvs->tcp_apps, TCP_APP_TAB_SIZE);
-	spin_lock_init(&ipvs->tcp_app_lock);
 	pd->timeout_table = ip_vs_create_timeout_table((int *)tcp_timeouts,
 							sizeof(tcp_timeouts));
 	if (!pd->timeout_table)
diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index 503a842..1a03e2d 100644
--- a/net/netfilter/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
@@ -359,19 +359,16 @@ static int udp_register_app(struct net *net, struct ip_vs_app *inc)
 
 	hash = udp_app_hashkey(port);
 
-
-	spin_lock_bh(&ipvs->udp_app_lock);
 	list_for_each_entry(i, &ipvs->udp_apps[hash], p_list) {
 		if (i->port == port) {
 			ret = -EEXIST;
 			goto out;
 		}
 	}
-	list_add(&inc->p_list, &ipvs->udp_apps[hash]);
+	list_add_rcu(&inc->p_list, &ipvs->udp_apps[hash]);
 	atomic_inc(&pd->appcnt);
 
   out:
-	spin_unlock_bh(&ipvs->udp_app_lock);
 	return ret;
 }
 
@@ -380,12 +377,9 @@ static void
 udp_unregister_app(struct net *net, struct ip_vs_app *inc)
 {
 	struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
-	struct netns_ipvs *ipvs = net_ipvs(net);
 
-	spin_lock_bh(&ipvs->udp_app_lock);
 	atomic_dec(&pd->appcnt);
-	list_del(&inc->p_list);
-	spin_unlock_bh(&ipvs->udp_app_lock);
+	list_del_rcu(&inc->p_list);
 }
 
 
@@ -403,12 +397,12 @@ static int udp_app_conn_bind(struct ip_vs_conn *cp)
 	/* Lookup application incarnations and bind the right one */
 	hash = udp_app_hashkey(cp->vport);
 
-	spin_lock(&ipvs->udp_app_lock);
-	list_for_each_entry(inc, &ipvs->udp_apps[hash], p_list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(inc, &ipvs->udp_apps[hash], p_list) {
 		if (inc->port == cp->vport) {
 			if (unlikely(!ip_vs_app_inc_get(inc)))
 				break;
-			spin_unlock(&ipvs->udp_app_lock);
+			rcu_read_unlock();
 
 			IP_VS_DBG_BUF(9, "%s(): Binding conn %s:%u->"
 				      "%s:%u to app %s on port %u\n",
@@ -425,7 +419,7 @@ static int udp_app_conn_bind(struct ip_vs_conn *cp)
 			goto out;
 		}
 	}
-	spin_unlock(&ipvs->udp_app_lock);
+	rcu_read_unlock();
 
   out:
 	return result;
@@ -467,7 +461,6 @@ static int __udp_init(struct net *net, struct ip_vs_proto_data *pd)
 	struct netns_ipvs *ipvs = net_ipvs(net);
 
 	ip_vs_init_hash_table(ipvs->udp_apps, UDP_APP_TAB_SIZE);
-	spin_lock_init(&ipvs->udp_app_lock);
 	pd->timeout_table = ip_vs_create_timeout_table((int *)udp_timeouts,
 							sizeof(udp_timeouts));
 	if (!pd->timeout_table)
