From: NeilBrown <neilb@suse.com>
To: Karsten Hohmeier <karsten@hohmatik.de>, linux-nfs@vger.kernel.org
Subject: Re: Un-unmountable NFS mountpoints with "Stale NFS file handle" - is this normal behavior?
Date: Thu, 01 Sep 2016 18:09:50 +1000 [thread overview]
Message-ID: <87a8fsca7l.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <b0e2b37b-5d90-ea9c-46e9-be577c4da634@hohmatik.de>
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On Sun, Aug 21 2016, Karsten Hohmeier wrote:
> Dear NFS list members,
>
> I recently contacted a few active NFS devs with an issue i ran into:
>
> We run a XenServer 6.5 (Kernel 3.10) with an older version of nfs-utils
> (1.0.9). NFS mountpoints on that machine acting as a client can not be
> unmounted (not even forcibly or lazy) after the connection to the NFS
> server broke for some reason.
>
> Most commands fail with "Stale NFS file handle".
>
> The Internet tells me this situation is unfixable and requires a reboot
> of the client to resolve. This is a pretty bad solution on a heavily
> loaded virtualization host.
>
> The response of Bruce Fields was: "Sounds like normal behavior, ..."
> (Sorry for not posting to the list in the first place, btw.)
>
> I'm still looking for some explanation why this happens, how it can be
> considered "normal behavior" and if it can be fixed/avoided/mitigated
> without rebooting.
This was fixed 3 years ago in Linux 3.12
Commit: 8033426e6bdb ("vfs: allow umount to handle mountpoints without revalidating them")
(and probably a few other related patches).
You need to be sure you have a version of util-linux where "umount -f"
and "umount -l" don't stat() the mount point.
NeilBrown
>
> Best regards
>
> Karsten Hohmeier
>
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next prev parent reply other threads:[~2016-09-01 8:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-20 19:03 Un-unmountable NFS mountpoints with "Stale NFS file handle" - is this normal behavior? Karsten Hohmeier
2016-09-01 8:09 ` NeilBrown [this message]
2016-09-01 19:07 ` Karsten Hohmeier
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