Dead lock at CREATE USER

SHOW FULL PROCESSLIST:

|  12 | root | localhost | mysql | Query   | 43178 | Waiting for table level lock    | UPDATE user LEFT JOIN db USING (Host,User) SET Create_user_priv='Y'

  WHERE @hadCreateUserPriv = 0 AND

        (user.Grant_priv = 'Y' OR db.Grant_priv = 'Y') |    0.000 |

|  19 | root | localhost | mysql | Query   | 43178 | Waiting for table metadata lock | ALTER TABLE user MODIFY Create_user_priv enum('N','Y') COLLATE utf8_general_ci DEFAULT 'N' NOT NULL AFTER Alter_routine_priv                                  |    0.000 |

|  23 | root | localhost | NULL  | Query   | 43178 | Waiting for table metadata lock | CREATE USER 'phpmyadmin'@'localhost' IDENTIFIED BY 'XXXXXXXXXXXXXXXXXXXXXXX'