mysql_upgrade fails if dbname+tablename+partioname > 64 chars

CREATE TABLE `extralongname_extralongname_extralongname_extralongname_ext` (

`id` int(10) unsigned NOT NULL,

`created_date` date NOT NULL DEFAULT '1970-01-01' COMMENT 'DATE(created), for index & partitions',

`created` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',

PRIMARY KEY (`created`,`id`,`created_date`)

) ENGINE=InnoDB STATS_PERSISTENT=1 DEFAULT CHARSET=latin1 ROW_FORMAT=DYNAMIC

/*!50100 PARTITION BY RANGE ( YEAR(created_date))

SUBPARTITION BY HASH ( MONTH(created_date))

SUBPARTITIONS 2

(PARTITION p2007 VALUES LESS THAN (2008) ENGINE = InnoDB,

PARTITION p2008 VALUES LESS THAN (2009) ENGINE = InnoDB

) */

Phase 4/7: Running 'mysql_fix_privilege_tables'

ERROR 1062 (23000)  Duplicate entry 'extralongname_extralongname_extralongname_extralongname_ext#P#p2' for key 'PRIMARY'

ERROR 1062 (23000)  Duplicate entry 'extralongname_extralongname_extralongname_extralongname_ext#P#p2' for key 'PRIMARY'

FATAL ERROR: Upgrade failed

truncate mysql.innodb_table_stats;