[aarch64-port-dev ] jdk8u: 8157306: Random infrequent null pointer exceptions in javac

[Andrew Haley]

Backport from JDK9; critical crasher bug.

Andrew.


changeset:   9110:1f235fde052f
tag:         tip
user:        aph
date:        Thu Jun 23 17:58:59 2016 +0000
summary:     8157306: Random infrequent null pointer exceptions in javac

diff -r 789ee8b7b92a -r 1f235fde052f src/share/vm/opto/lcm.cpp
--- a/src/share/vm/opto/lcm.cpp	Tue Aug 02 16:52:03 2016 +0100
+++ b/src/share/vm/opto/lcm.cpp	Thu Jun 23 17:58:59 2016 +0000
@@ -1090,11 +1090,12 @@
     Block *sb = block->_succs[i];
     // Clone the entire area; ignoring the edge fixup for now.
     for( uint j = end; j > beg; j-- ) {
-      // It is safe here to clone a node with anti_dependence
-      // since clones dominate on each path.
       Node *clone = block->get_node(j-1)->clone();
       sb->insert_node(clone, 1);
       map_node_to_block(clone, sb);
+      if (clone->needs_anti_dependence_check()) {
+        insert_anti_dependences(sb, clone);
+      }
     }
   }