mysqldump: Got error: 1045: Access denied for user ...... when using LOCK TABLES

[root@csfdpdev data]# mysqldump -ucsfdp -pcsfdp sync_cdp > sync_cdp_26_20110915.sql
mysqldump: Got error: 1045: Access denied for user 'csfdp'@'%' (using password: YES) when using LOCK TABLES


但是csfdp已经赋予了再sync_cdp库上的lock tables的权限了！