diff -NurpP --minimal linux-3.5-vs2.3.4/kernel/vserver/limit.c linux-3.5-vs2.3.4.1/kernel/vserver/limit.c
--- linux-3.5-vs2.3.4/kernel/vserver/limit.c	2012-07-23 01:45:55.000000000 +0200
+++ linux-3.5-vs2.3.4.1/kernel/vserver/limit.c	2012-08-09 19:58:03.000000000 +0200
@@ -258,11 +258,13 @@ int vc_rlimit_stat(struct vx_info *vxi, 
 void vx_vsi_meminfo(struct sysinfo *val)
 {
 #ifdef	CONFIG_CGROUP_MEM_RES_CTLR
-	struct mem_cgroup *mcg = mem_cgroup_from_task(current);
+	struct mem_cgroup *mcg;
 	u64 res_limit, res_usage;
 
+	rcu_read_lock();
+	mcg = mem_cgroup_from_task(current);
 	if (!mcg)
-		return;
+		goto out;
 
 	res_limit = mem_cgroup_res_read_u64(mcg, RES_LIMIT);
 	res_usage = mem_cgroup_res_read_u64(mcg, RES_USAGE);
@@ -273,6 +275,8 @@ void vx_vsi_meminfo(struct sysinfo *val)
 	val->bufferram = 0;
 	val->totalhigh = 0;
 	val->freehigh = 0;
+out:
+	rcu_read_unlock();
 #endif	/* CONFIG_CGROUP_MEM_RES_CTLR */
 	return;
 }
@@ -281,12 +285,14 @@ void vx_vsi_swapinfo(struct sysinfo *val
 {
 #ifdef	CONFIG_CGROUP_MEM_RES_CTLR
 #ifdef	CONFIG_CGROUP_MEM_RES_CTLR_SWAP
-	struct mem_cgroup *mcg = mem_cgroup_from_task(current);
+	struct mem_cgroup *mcg;
 	u64 res_limit, res_usage, memsw_limit, memsw_usage;
 	s64 swap_limit, swap_usage;
 
+	rcu_read_lock();
+	mcg = mem_cgroup_from_task(current);
 	if (!mcg)
-		return;
+		goto out;
 
 	res_limit = mem_cgroup_res_read_u64(mcg, RES_LIMIT);
 	res_usage = mem_cgroup_res_read_u64(mcg, RES_USAGE);
@@ -295,7 +301,7 @@ void vx_vsi_swapinfo(struct sysinfo *val
 
 	/* memory unlimited */
 	if (res_limit == RESOURCE_MAX)
-		return;
+		goto out;
 
 	swap_limit = memsw_limit - res_limit;
 	/* we have a swap limit? */
@@ -309,6 +315,8 @@ void vx_vsi_swapinfo(struct sysinfo *val
 	/* total shown minus usage gives free swap */
 	val->freeswap = (swap_usage < swap_limit) ?
 		val->totalswap - (swap_usage >> PAGE_SHIFT) : 0;
+out:
+	rcu_read_unlock();
 #else	/* !CONFIG_CGROUP_MEM_RES_CTLR_SWAP */
 	val->totalswap = 0;
 	val->freeswap = 0;
@@ -319,12 +327,19 @@ void vx_vsi_swapinfo(struct sysinfo *val
 
 long vx_vsi_cached(struct sysinfo *val)
 {
+	long cache = 0;
 #ifdef	CONFIG_CGROUP_MEM_RES_CTLR
-	struct mem_cgroup *mcg = mem_cgroup_from_task(current);
+	struct mem_cgroup *mcg;
 
-	return mem_cgroup_stat_read_cache(mcg);
-#else
-	return 0;
+	rcu_read_lock();
+	mcg = mem_cgroup_from_task(current);
+	if (!mcg)
+		goto out;
+
+	cache = mem_cgroup_stat_read_cache(mcg);
+out:
+	rcu_read_unlock();
 #endif
+	return cache;
 }