From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: Linux 2.6.26-rc4
Date: Tue, 3 Jun 2008 11:35:43 +0100
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
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	linux-fsdevel@vger.kernel.org
To: Jesper Krogh <jesper@krogh.cc>
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On Tue, Jun 03, 2008 at 10:57:13AM +0100, Al Viro wrote:
> On Tue, Jun 03, 2008 at 11:49:32AM +0200, Jesper Krogh wrote:
> 
> > I reported it to the NFS-guys on a .22 kernel, and was directed to the
> > fsdevel list(CC'ed again) back then. Now the problem is reproduces on
> > .26-rc4
> 
> Lovely...  Do you have the full oops trace, with the actual code
> dump?

FWIW, searching for graft_tree on arjan's site:
#12419:
	negative dentry path->dentry
#17367:
	ditto
#17463:
	ditto
#13042:
	probably the same (is that earlier oops you've mentioned?)
#18932:
	WTF is that one doing there?  (graft_tree is never mentioned in it)

Nuts...  I really don't see how that could happen, unless it's NFS
revalidation playing silly buggers with dentries and ->d_revalidate()
there ends up turning dentry passed to it into negative one...

Where does the mountpoint in question live and what gets passed to
sys_mount()?