This is the real fix for ticket 317 and ticket 1065 and ticket 278.

This commit was SVN r16084.

ompi/datatype/dt_add.c

@@ -87,8 +87,7 @@ int32_t ompi_ddt_add( ompi_datatype_t* pdtBase, const ompi_datatype_t* pdtAdd,
      */
     if( extent == -1 ) extent = (pdtAdd->ub - pdtAdd->lb);
 
-    if( pdtAdd->flags & DT_FLAG_PREDEFINED ) { /* add a basic datatype */
-        /* handle special cases for DT_LB and DT_UB */
+    /* handle special cases for DT_LB and DT_UB and their duplicate */
     if( DT_LB == pdtAdd->id ) {
         pdtBase->bdt_used |= (((uint64_t)1) << DT_LB);
         if( pdtBase->flags & DT_FLAG_USER_LB ) {
@@ -114,6 +113,7 @@ int32_t ompi_ddt_add( ompi_datatype_t* pdtBase, const ompi_datatype_t* pdtAdd,
         }
         return OMPI_SUCCESS;
     }
+    if( pdtAdd->flags & DT_FLAG_PREDEFINED ) { /* add a basic datatype */
         place_needed = (extent == (ptrdiff_t)pdtAdd->size ? 1 : 3);
     } else {
         place_needed = pdtAdd->desc.used;