Index: sys/sys/buf_ring.h
===================================================================
--- sys/sys/buf_ring.h
+++ sys/sys/buf_ring.h
@@ -162,8 +162,8 @@
 	uint32_t prod_tail;
 	void *buf;
 	
-	cons_head = br->br_cons_head;
-	prod_tail = br->br_prod_tail;
+	cons_head = atomic_load_acq_32(&br->br_cons_head);
+	prod_tail = atomic_load_acq_32(&br->br_prod_tail);
 	
 	cons_next = (cons_head + 1) & br->br_cons_mask;
 #ifdef PREFETCH_DEFINED