src/share/vm/gc/g1/g1CollectedHeap.cpp

*** 4387,4396 ****
--- 4387,4405 ----
    }
  
    rp->verify_no_references_recorded();
    assert(!rp->discovery_enabled(), "should have been disabled");
  
+   // If during an initial mark pause we install a pending list head which is not otherwise reachable
+   // ensure that it is marked in the bitmap for concurrent marking to discover.
+   if (collector_state()->during_initial_mark_pause()) {
+     oop pll_head = Universe::reference_pending_list();
+     if (pll_head != NULL) {
+       _cm->grayRoot(pll_head);
+     }
+   }
+ 
    // FIXME
    // CM's reference processing also cleans up the string and symbol tables.
    // Should we do that here also? We could, but it is a serial operation
    // and could significantly increase the pause time.