--- old/src/share/vm/gc/g1/g1ConcurrentMark.cpp	2016-06-07 11:06:19.170538274 -0700
+++ new/src/share/vm/gc/g1/g1ConcurrentMark.cpp	2016-06-07 11:06:19.030538279 -0700
@@ -982,7 +982,6 @@
                                      root_regions()->num_root_regions());
     assert(parallel_marking_threads() <= max_parallel_marking_threads(),
            "Maximum number of marking threads exceeded");
-    _parallel_workers->add_workers(_parallel_marking_threads, false);
 
     G1CMRootRegionScanTask task(this);
     log_debug(gc, ergo)("Running %s using %u workers for %u work units.",