Linux卸载NAS磁盘，报device is busy

# umount /data
umount.nfs: /data: device is busy
umount.nfs: /data: device is busy
# fuser -m -v /data
             用户     进程号 权限   命令
/data/:      root      19881 ..c.. bash
# kill -9 19881
# umount /data