Another MySQL daemon already running with the same unix socket. mysqld failed

Today i restarted mysql service in my machine. It stopped but not starting

[root@backup-server ~]# service mysqld stop
Stopping mysqld:                                           [  OK  ]

[root@backup-server ~]# service mysqld start
Another MySQL daemon already running with the same unix socket.
Starting mysqld:                                           [FAILED]

Just I rename the mysql.sock file after that it is working fine.

[root@backup-server ~]# mv /var/lib/mysql/mysql.sock /var/lib/mysq /mysql.sock.bak

[root@backup-server ~]# service mysqld start
Starting mysqld:                                           [  OK  ]

My issue resolved...