If we want the resized data to have the correct LB and UB (both

soft and hard markers) we should force an add instead of
relying on the OPAL datatype resize operation.

ompi/datatype/ompi_datatype.h

@@ -200,14 +200,14 @@ OMPI_DECLSPEC int32_t ompi_datatype_create_subarray(int ndims, int const* size_a
                                                     int const* start_array, int order,
                                                     const ompi_datatype_t* oldtype, ompi_datatype_t** newtype);
 static inline int32_t
-ompi_datatype_create_resized( const ompi_datatype_t* oldType, OPAL_PTRDIFF_TYPE lb, OPAL_PTRDIFF_TYPE extent, ompi_datatype_t** newType )
+ompi_datatype_create_resized( const ompi_datatype_t* oldType,
+                              OPAL_PTRDIFF_TYPE lb,
+                              OPAL_PTRDIFF_TYPE extent,
+                              ompi_datatype_t** newType )
 {
-    ompi_datatype_t * type;
-    ompi_datatype_duplicate( oldType, &type );
-    if ( NULL == type) {
-        return OMPI_ERR_OUT_OF_RESOURCE;
-    }
-    opal_datatype_resize ( &type->super, lb, extent );
+    ompi_datatype_t* type = ompi_datatype_create( oldType->super.desc.used );
+
+    ompi_datatype_add( type, oldType, 1, lb, extent );
     *newType = type;
     return OMPI_SUCCESS;
 }