A statement like

create table DUAL (f int);

crashes MaxScale. The reason is that DUAL is a "magic" table that can be used when a table is not needed, e.g. select 1 from dual.

The create statement would fail like

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'DUAL (f int)' at line 1

when executed directly against the server, so the statement is invalid anyway. But MaxScale must obviously not crash.