If a server is crashed after preparing a XA transaction and right before
committing the XA transaction, which is used to modify the system
gtid_executed table explicitly by users, then the following recovery
is aborting due to an innodb_lock_wait_timeout error when it is
reading the system gtid_executed table.

To fix the problem, we do not allow users to modify the
mysql.gtid_executed table explicitly by a XA transaction.