--- a/src/hotspot/share/opto/loopTransform.cpp	Fri Jul 13 11:21:55 2018 +0800
+++ b/src/hotspot/share/opto/loopTransform.cpp	Thu Jul 12 16:31:28 2018 +0200
@@ -768,11 +768,12 @@
   Node *init_n = cl->init_trip();
   Node *limit_n = cl->limit();
   int stride_con = cl->stride_con();
+  if (limit_n == NULL) return false; // We will dereference it below.
+
   // Non-constant bounds.
   // Protect against over-unrolling when init or/and limit are not constant
   // (so that trip_count's init value is maxint) but iv range is known.
-  if (init_n   == NULL || !init_n->is_Con()  ||
-      limit_n  == NULL || !limit_n->is_Con()) {
+  if (init_n == NULL || !init_n->is_Con() || !limit_n->is_Con()) {
     Node* phi = cl->phi();
     if (phi != NULL) {
       assert(phi->is_Phi() && phi->in(0) == _head, "Counted loop should have iv phi.");