linux-kernel - Re: 2.6.24-rc3-git4 NFS crossmnt regression

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Message-Id: <20071207161508.afe8fdf1.akpm@linux-foundation.org>
Date:	Fri, 7 Dec 2007 16:15:08 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	rjw@...k.pl, trond.myklebust@....uio.no, gnome42@...il.com,
	linux-kernel@...r.kernel.org, bfields@...ldses.org,
	ebiederm@...ssion.com, den@...nvz.org
Subject: Re: 2.6.24-rc3-git4 NFS crossmnt regression

On Sat, 8 Dec 2007 03:00:43 +0300
Alexey Dobriyan <adobriyan@...il.com> wrote:

> On Sat, Dec 08, 2007 at 12:43:28AM +0100, Rafael J. Wysocki wrote:
> > On Saturday, 8 of December 2007, Andrew Morton wrote:
> > > On Fri, 07 Dec 2007 17:51:58 -0500
> > > Trond Myklebust <trond.myklebust@....uio.no> wrote:
> > > 
> > > > 
> > > > On Fri, 2007-12-07 at 14:39 -0500, Shane wrote:
> > > > > On Dec 7, 2007 2:16 PM, Shane <gnome42@...il.com> wrote:
> > > > > ...
> > > > > > Confirmed working in rc4-git5.  I'll deploy this kernel in a few more
> > > > > > spots and check for other regressions.
> > > > > 
> > > > > Hmm, I installed a new kernel built from the same sources on the NFS
> > > > > server. And now I don't see anything at all in the crossmnt dirs.
> > > > > 
> > > > > ls /dirA/dirB/dirC  --> zero output (empty dir)
> > > > > 
> > > > > Are there any other pending fixes?
> > > > > 
> > > > > Shane
> > > > 
> > > > You've probably fallen afoul of 
> > > > 
> > > >    http://bugzilla.kernel.org/show_bug.cgi?id=9504
> > > > 
> > > 
> > > Yeah.
> > > 
> > > I have a tentative fix below but I can't seem to get Eric and Denis to get
> > > a suitable fix nailed down.  It's urgent!
> > 
> > Well, how about asking Linus to revert commit
> > 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416 altogether and starting over again?
> > 
> > It apparently causes more trouble than the issue it was supposed to fix.
> 
> I very much agree. ->shadow_proc is so ugly, so it's not funny anymore.
> Adding such hook for proc part of networking _and_ for modules is just asking
> for trouble as was demonstrated.

OK, perhaps a revert is the best thing to do here.  I don't think anyone
will be expecting fully finalised and robust netns support in 2.6.24.

Eric?
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