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

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@@ -116,10 +116,16 @@
 HeapRegion::block_is_obj(const HeapWord* p) const {
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
 
   if (!this->is_in(p)) {
     HeapRegion* hr = g1h->heap_region_containing(p);
+#ifdef ASSERT
+    assert(hr->is_humongous(), "This case can only happen for humongous regions");
+    oop obj = oop(hr->humongous_start_region()->bottom());
+    assert((HeapWord*)obj <= p, "p must be in humongous object");
+    assert(p <= (HeapWord*)obj + obj->size(), "p must be in humongous object");
+#endif
     return hr->block_is_obj(p);
   }
   if (ClassUnloadingWithConcurrentMark) {
     return !g1h->is_obj_dead(oop(p), this);
   }
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