src/share/vm/gc/g1/g1RemSet.inline.hpp

*** 58,67 ****
--- 58,69 ----
  #endif // CHECK_UNHANDLED_OOPS
    assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
    assert(_g1->is_in_reserved(obj), "must be in heap");
  #endif // ASSERT
  
+   assert(from->is_in_reserved(p) || from->is_starts_humongous(), "p is not in from");
+ 
    HeapRegion* to = _g1->heap_region_containing(obj);
    if (from != to) {
      assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
      to->rem_set()->add_reference(p, tid);
    }