mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository
mysql>  reset slave;
Query OK, 0 rows affected (0.04 sec)

mysql> start slave IO_THREAD;
Query OK, 0 rows affected (0.07 sec)

mysql> stop slave IO_THREAD;
Query OK, 0 rows affected (0.01 sec)

mysql> reset slave;
Query OK, 0 rows affected (0.10 sec)

mysql> start slave;
Query OK, 0 rows affected (0.20 sec)

mysql> show slave status\G