Try "umount -fl" ('eff el')
On Tue, Feb 2, 2016 at 1:58 PM, Dave Burns <tburns at hawaii.edu> wrote:
> My NFS server is up and other clients can access x. One particular client
> can't. I tried to unmount the NFS share:
>
> [root at nfsclient ~]# umount -f /disk/x
> umount2: Device or resource busy
> umount.nfs: /disk/x: device is busy
> umount2: Device or resource busy
> umount.nfs: /disk/x: device is busy
>
> If I use df or lsof to try to figure out what process to kill, they hang. I
> am reluctant to just reboot, as many other users are getting stuff done.
> dmesg doesn't show anything useful.
>
> How to get unstuck?
>
> thanks,
> Dave
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--
Matt Phelps
System Administrator, Computation Facility
Harvard - Smithsonian Center for Astrophysics
mphelps at cfa.harvard.edu, http://www.cfa.harvard.edu