--- a/src/hotspot/share/opto/node.cpp	Wed Jan 09 00:25:41 2019 -0800
+++ b/src/hotspot/share/opto/node.cpp	Fri Dec 07 17:56:51 2018 +0100
@@ -37,6 +37,7 @@
 #include "opto/node.hpp"
 #include "opto/opcodes.hpp"
 #include "opto/regmask.hpp"
+#include "opto/rootnode.hpp"
 #include "opto/type.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/macros.hpp"
@@ -1310,6 +1311,9 @@
 
   while (nstack.size() > 0) {
     dead = nstack.pop();
+    if (dead->Opcode() == Op_SafePoint) {
+      dead->as_SafePoint()->disconnect_from_root(igvn);
+    }
     if (dead->outcnt() > 0) {
       // Keep dead node on stack until all uses are processed.
       nstack.push(dead);