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@@ -23,10 +23,11 @@
+#include "gc/g1/g1CollectedHeap.inline.hpp"
 #include "gc/g1/g1ParScanThreadState.hpp"
 #include "gc/g1/g1RemSet.hpp"
 #include "oops/access.inline.hpp"
 #include "oops/oop.inline.hpp"

@@ -38,10 +39,16 @@
   // set, due to (benign) races in the claim mechanism during RSet scanning more
   // than one thread might claim the same card. So the same card may be
   // processed multiple times, and so we might get references into old gen here.
   // So we need to redo this check.
   const InCSetState in_cset_state = _g1h->in_cset_state(obj);
+  // References pushed onto the work stack should never point to a humongous region
+  // as they are not added to the collection set due to above precondition.
+  assert(!in_cset_state.is_humongous(),
+         "Obj " PTR_FORMAT " should not refer to humongous region %u from " PTR_FORMAT,
+         p2i(obj), _g1h->addr_to_region((HeapWord*)obj), p2i(p));
   if (!in_cset_state.is_in_cset()) {
     // In this case somebody else already did all the work.
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