--- a/src/hotspot/share/gc/g1/g1ParScanThreadState.inline.hpp	Mon Mar 05 11:16:23 2018 +0100
+++ b/src/hotspot/share/gc/g1/g1ParScanThreadState.inline.hpp	Mon Mar 05 11:32:17 2018 +0100
@@ -50,8 +50,8 @@
   } else if (in_cset_state.is_humongous()) {
     _g1h->set_humongous_is_live(obj);
   } else {
-    assert(in_cset_state.is_default() || in_cset_state.is_ext(),
-         "In_cset_state must be NotInCSet or Ext here, but is " CSETSTATE_FORMAT, in_cset_state.value());
+    assert(in_cset_state.is_default(),
+         "In_cset_state must be NotInCSet here, but is " CSETSTATE_FORMAT, in_cset_state.value());
   }
 
   assert(obj != NULL, "Must be");