diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 98de8ab..66a7f9e 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -215,6 +215,7 @@ static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif,
 	struct xenvif_rx_meta *meta;
 	struct xen_netif_rx_request *req;
 
+	if((vif->rx.req_cons + 1 > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d", npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons + 1);}
 	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
 
 	meta = npo->meta + npo->meta_prod++;
@@ -356,6 +357,7 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 
 	/* Set up a GSO prefix descriptor, if necessary */
 	if ((1 << gso_type) & vif->gso_prefix_mask) {
+        	if((vif->rx.req_cons + 1 > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d", npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons + 1);}
 		req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
 		meta = npo->meta + npo->meta_prod++;
 		meta->gso_type = gso_type;
@@ -363,7 +365,7 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 		meta->size = 0;
 		meta->id = req->id;
 	}
-
+       	if((vif->rx.req_cons + 1 > vif->rx.sring->req_prod) && net_ratelimit()){netdev_warn(vif->dev, "?!? npo->meta_prod:%d vif->rx.sring->req_prod:%d vif->rx.req_cons:%d", npo->meta_prod , vif->rx.sring->req_prod, vif->rx.req_cons + 1);}
 	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
 	meta = npo->meta + npo->meta_prod++;
 
@@ -380,6 +382,7 @@ static int xenvif_gop_skb(struct sk_buff *skb,
 	npo->copy_off = 0;
 	npo->copy_gref = req->gref;
 
+
 	data = skb->data;
 	while (data < skb_tail_pointer(skb)) {
 		unsigned int offset = offset_in_page(data);
@@ -420,11 +423,14 @@ static int xenvif_check_gop(struct xenvif *vif, int nr_meta_slots,
 	for (i = 0; i < nr_meta_slots; i++) {
 		copy_op = npo->copy + npo->copy_cons++;
 		if (copy_op->status != GNTST_okay) {
-			netdev_dbg(vif->dev,
+                    if (net_ratelimit()){
+			netdev_warn(vif->dev,
 				   "Bad status %d from copy to DOM%d.\n",
 				   copy_op->status, vif->domid);
 			status = XEN_NETIF_RSP_ERROR;
-		}
+                        netdev_warn(vif->dev, "?!? %s status err? status:%d i:%d nr_meta_slots:%d copy_op->status:%d npo->copy_cons:%d  \n", __FUNCTION__,status, i, nr_meta_slots, copy_op->status, npo->copy_cons );
+		    }
+       		}
 	}
 
 	return status;
@@ -451,8 +457,14 @@ static void xenvif_add_frag_responses(struct xenvif *vif, int status,
 			flags = XEN_NETRXF_more_data;
 
 		offset = 0;
+
+                if(status > 10000 || status < 0){
+                    if (net_ratelimit())
+                        netdev_warn(vif->dev, "?!? %s status err? status:%d i:%d nr_meta_slots:%d flags:%d size:%d\n", __FUNCTION__,status, i, nr_meta_slots, flags, meta[i].size);
+                }
 		make_rx_response(vif, meta[i].id, status, offset,
 				 meta[i].size, flags);
+	
 	}
 }
 
@@ -514,6 +526,9 @@ static void xenvif_rx_action(struct xenvif *vif)
 
 		sco = (struct skb_cb_overlay *)skb->cb;
 		sco->meta_slots_used = xenvif_gop_skb(skb, &npo);
+
+
+
 		BUG_ON(sco->meta_slots_used > max_slots_needed);
 
 		__skb_queue_tail(&rxq, skb);
@@ -551,6 +566,8 @@ static void xenvif_rx_action(struct xenvif *vif)
 
 		status = xenvif_check_gop(vif, sco->meta_slots_used, &npo);
 
+
+
 		if (sco->meta_slots_used == 1)
 			flags = 0;
 		else
@@ -563,6 +580,12 @@ static void xenvif_rx_action(struct xenvif *vif)
 			flags |= XEN_NETRXF_data_validated;
 
 		offset = 0;
+
+                if(status > 10000 || status < 0){
+                    if (net_ratelimit())
+                        netdev_warn(vif->dev, "?!? %s status err? status:%d meta_slots_used:%d flags:%d size:%d ip_summed:%d is_gso:%d skb_shinfo(skb)->gso_type:%d vif->meta[npo.meta_cons].gso_type:%d nr_frags:%d npo.copy_prod:%d, npo.meta_cons:%d\n", __FUNCTION__,status, sco->meta_slots_used, flags, skb_is_gso(skb) , skb_shinfo(skb)->gso_type, vif->meta[npo.meta_cons].gso_type, vif->meta[npo.meta_cons].size, skb->ip_summed, skb_shinfo(skb)->nr_frags , npo.copy_prod, npo.meta_cons);
+                }
+		
 		resp = make_rx_response(vif, vif->meta[npo.meta_cons].id,
 					status, offset,
 					vif->meta[npo.meta_cons].size,
@@ -713,7 +736,6 @@ static int xenvif_count_requests(struct xenvif *vif,
 
 		if (drop_err)
 			txp = &dropped_tx;
-
 		memcpy(txp, RING_GET_REQUEST(&vif->tx, cons + slots),
 		       sizeof(*txp));
 
@@ -823,6 +845,12 @@ static struct gnttab_copy *xenvif_get_requests(struct xenvif *vif,
 			gop->dest.offset = dst_offset;
 			gop->dest.u.gmfn = virt_to_mfn(page_address(page));
 
+                        if(txp->gref > 10000 || txp->gref <=0){
+	                     if (net_ratelimit())
+                                 netdev_warn(vif->dev, "?!? %s ref out of bounds? gref:%d srcdomid:%d dstdomid:%d slot:%d \n",__FUNCTION__, txp->gref, vif->domid, DOMID_SELF, slot);
+                        }
+	
+
 			if (dst_offset + txp->size > PAGE_SIZE) {
 				/* This page can only merge a portion
 				 * of tx request. Do not increment any
@@ -1000,7 +1028,6 @@ static int xenvif_get_extras(struct xenvif *vif,
 			xenvif_fatal_tx_err(vif);
 			return -EBADR;
 		}
-
 		memcpy(&extra, RING_GET_REQUEST(&vif->tx, cons),
 		       sizeof(extra));
 		if (unlikely(!extra.type ||
@@ -1393,6 +1420,7 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
 			break;
 
 		idx = vif->tx.req_cons;
+
 		rmb(); /* Ensure that we see the request before we copy it. */
 		memcpy(&txreq, RING_GET_REQUEST(&vif->tx, idx), sizeof(txreq));