Correct an error in the previous revision, specifically,

vm_object_madvise() should request that the reactivated, cached page
not be busied.

Reported by: Rink Springer
Approved by: re (kensmith)

sys/vm/vm_object.c

@@ -1105,7 +1105,8 @@ vm_object_madvise(vm_object_t object, vm_pindex_t pindex, int count, int advise)
 			/*
 			 * If the page is cached, reactivate it.
 			 */
-			m = vm_page_alloc(tobject, tpindex, VM_ALLOC_IFCACHED);
+			m = vm_page_alloc(tobject, tpindex, VM_ALLOC_IFCACHED |
+			    VM_ALLOC_NOBUSY);
 		}
 		if (m == NULL) {
 			/*