--- old/src/hotspot/share/gc/shared/genCollectedHeap.cpp	2018-08-23 13:30:32.627844754 -0700
+++ new/src/hotspot/share/gc/shared/genCollectedHeap.cpp	2018-08-23 13:30:32.325845685 -0700
@@ -1147,7 +1147,7 @@
 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) {
   bool first = true;
   size_t min_size = 0;   // "first" makes this conceptually infinite.
-  ScratchBlock **smallest_ptr, *smallest;
+  ScratchBlock **smallest_ptr = NULL, *smallest =  NULL;
   ScratchBlock  *cur = *prev_ptr;
   while (cur) {
     assert(*prev_ptr == cur, "just checking");