[CentOS] nfs stuck, don't know what processes to kill

Tue Feb 2 19:23:49 UTC 2016
m.roth at 5-cent.us <m.roth at 5-cent.us>

Dave Burns 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?

*IF* I understand what you're saying, on that one client, you're trying to
umount the nfs share. Is that the case?

IF that is the case... is autofs running? If so, service autofs stop, and
you should be able to umount it.

       mark