umount target is busy. fuser
fuser -cu /dev/sde1
/dev/sde1: 20064c(root)
[root@20201013 ~]# fuser -cu /mnt/d
/mnt/d: 20064c(root)
[root@20201013 ~]#
[root@20201013 ~]# ps -aux | grep 20064
root 3408 0.0 0.0 112712 960 pts/0 S+ 22:56 0:00 grep --color=auto 20064
root 20064 0.0 0.0 115580 2176 pts/1 Ss+ Oct02 0:00 -bash
[root@20201013 ~]# kill 20064
[root@20201013 ~]# ps -aux | grep 20064
root 3422 0.0 0.0 112712 960 pts/0 S+ 22:57 0:00 grep --color=auto 20064
root 20064 0.0 0.0 115580 2176 pts/1 Ss+ Oct02 0:00 -bash
[root@20201013 ~]# kill -9 20064
[root@20201013 ~]# ps -aux | grep 20064
root 3439 0.0 0.0 112712 956 pts/0 S+ 22:57 0:00 grep --color=auto 20064
[root@20201013 ~]# cd
[root@20201013 ~]#
[root@20201013 ~]# umount /mnt/d
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