8331920: ubsan: g1CardSetContainers.inline.hpp:266:5: runtime error: index 2 out of bounds for type 'G1CardSetHowl::ContainerPtr [2]' reported

src/hotspot/share/gc/g1/g1CardSetContainers.hpp

@@ -247,7 +247,7 @@ class G1CardSetHowl : public G1CardSetContainer {
   template <class CardOrRangeVisitor>
   void iterate_cardset(ContainerPtr const container, uint index, CardOrRangeVisitor& found, G1CardSetConfiguration* config);
 
-  ContainerPtr at(EntryCountType index);
+  ContainerPtr at(EntryCountType index) const;
 
   ContainerPtr const* buckets() const;
 

src/hotspot/share/gc/g1/g1CardSetContainers.inline.hpp

@@ -266,7 +266,7 @@ inline G1CardSetHowl::ContainerPtr* G1CardSetHowl::container_addr(EntryCountType
   return const_cast<ContainerPtr*>(const_cast<const G1CardSetHowl*>(this)->container_addr(index));
 }
 
-inline G1CardSetHowl::ContainerPtr G1CardSetHowl::at(EntryCountType index) {
+inline G1CardSetHowl::ContainerPtr G1CardSetHowl::at(EntryCountType index) const {
   return *container_addr(index);
 }