Re: Killing process in D state on mount to dead NFS server.

[NeilBrown <neilb@suse.de>]

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On Thu, 31 Jul 2014 11:00:35 -0700 Ben Greear <greearb@candelatech.com> wrote:

> So, this has been asked all over the interweb for years and years, but
> the best answer I can find is to reboot the system or create a fake NFS
> server somewhere with the same IP as the gone-away NFS server.
> 
> The problem is:
> 
> I have some mounts to an NFS server that no longer exists (crashed/powered down).
> 
> I have some processes stuck trying to write to files open on these mounts.
> 
> I want to kill the process and unmount.
> 
> umount -l will make the mount go a way, sort of.  But process is still hung.
> umount -f complains:
>   umount2:  Device or resource busy
>   umount.nfs: /mnt/foo: device is busy
> 
> kill -9 does not work on process.

Kill -1 should work (since about 2.6.25 or so).
If it doesn't please report the kernel version and 
 cat /proc/$PID/stack

for some processes that cannot be killed.

NeilBrown

> 
> 
> Aside from bringing a fake NFS server back up on the same IP, is there any
> other way to get these mounts unmounted and the processes killed without
> rebooting?
> 
> Thanks,
> Ben
> 


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