Re: Cannot umount: device is busy

[Jerome BENOIT <g6299304p@rezozer.net>]

Hello List,

On 14/04/11 15:22, T o n g wrote:
> Hi,
>
> I can't umount a device even I've killed all related processes:
>
>    % umount /mnt/mpoint
>    umount: /mnt/mpoint: device is busy.
> 	  (In some cases useful info about processes that use
> 	   the device is found by lsof(8) or fuser(1))

It can be busy simply because you are there:


>    % fuser -vm /mnt/mpoint
> 		       USER        PID ACCESS COMMAND
>    /mnt/mpoint:         root     kernel mount /mnt/mpoint
> 		       root     kernel knfsd /mnt/mpoint
>
> I.e., there is no processes associated with the mount point any more,
> but I still can't umount the device. Moreover:
>
>    $ ps -eaf | grep knfs[d] || echo no found
>    no found
>
> I.e., there isn't such task as knfsd in ps list. Why is that?
>
> Is there any way that I can kill all those kernel processes associated
> with the mount?

have you tried to force the umount ?

hth,
Jerome


> Thanks