umount: device is busy. remote filesystem

When the connection to a remote resource, mounted using sshfs, is broken you can not access the directory using command like ls.

And if you try to umount the remote file system you get this error:

$ sudo umount /mnt/target
umount: /mnt/target: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

In this case you have to umount using -l option

umount -l /mnt/target


umount -f /mnt/target
-l Lazy unmount. Detach the filesystem from the filesystem hierar‐
 chy now, and cleanup all references to the filesystem as soon as
 it is not busy anymore. (Requires kernel 2.4.11 or later.)
-f Force unmount (in case of an unreachable NFS system). (Requires
 kernel 2.1.116 or later.)

to check the problem you can use mount or mount -v

$ mount -v 
umount: /mnt/target is not mounted (according to mtab)

If this can not resolve the trouble, you can use fuser to show pids of the processes which using mounted device

fuser -m /mnt/target

Then you have to kill thoose processes and then try again umount

sudo kill  id-process
sudo kill -9 id-process

You can use lsof, too. Lsof tell you open files.

lsof /mnt/target

As ultimate choice we have to restart the computer this removes all mounted points.

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