执行umount 命令的时候出现 device is busy

执行umount 命令的时候出现 device is busy ，有人在使用这块磁盘
umount /dev/sde1
umount: /u01/app/oracle: device is busy
umount: /u01/app/oracle: device is busy
使用fuser 命令查看哪个进程在使用
[root@localhost ~]# fuser -m /u01/app/oracle/
/u01/app/oracle/:     2636c  2694c
[root@localhost ~]# ps aux | grep 2636
root      2636  0.0  0.2   4532  1464 pts/1    S    09:56   0:00 bash
root      2776  0.0  0.1   3916   696 pts/1    R+   10:18   0:00 grep 2636
kill -9 干掉进程
[root@localhost ~]# kill -9 2636
[root@localhost ~]# umount /dev/sde1