--- old/src/share/vm/gc_implementation/g1/vm_operations_g1.hpp	2015-03-31 14:52:49.931189412 +0200
+++ new/src/share/vm/gc_implementation/g1/vm_operations_g1.hpp	2015-03-31 14:52:49.823189417 +0200
@@ -47,6 +47,11 @@
                                  GCCause::Cause gc_cause)
     : VM_CollectForAllocation(word_size, gc_count_before, gc_cause),
       _pause_succeeded(false) {}
+
+  // override to handle G1 specific locking asserts
+  virtual bool doit_prologue();
+  virtual void doit_epilogue();
+
   bool pause_succeeded() { return _pause_succeeded; }
   void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
   AllocationContext_t  allocation_context() { return _allocation_context; }