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

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Date:	Fri, 7 Dec 2007 13:14:34 -0500
From:	Shane <gnome42@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	"Trond Myklebust" <trond.myklebust@....uio.no>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.24-rc3-git4 NFS crossmnt regression

On Dec 7, 2007 7:02 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
...
> > 2.6.24-rc3-git1 is last known good kernel. The problem also exists
> > with the latest snap 2.6.24-rc4-git4. NFS server is 2.6.23-rc9 and
> > is unchanged.
>
> hm, there have been no nfs changes since 2.6.24-rc4.

Ok, but the problem seems to have appeared before 2.6.24-rc4.

> > It is easily reproducible here, hopefully for the person who
> > knows how to debug it too :)
> >
>
> I guess a full set of the commands which you typed to reproduce this would
> help.

Server is 2.6.23-rc9 and is exporting:

/dirA/dirB
10.10.20.0/255.255.255.0(rw,async,no_root_squash,no_subtree_check,insecure,crossmnt)
/dirA/dirB/dirC
10.10.20.0/255.255.255.0(rw,async,no_root_squash,no_subtree_check,insecure)
/dirA/dirB/dirD
10.10.20.0/255.255.255.0(rw,async,no_root_squash,no_subtree_check,insecure)

The NFS client (Core2 SMP) 2.6.24-rc3-git4:

NFS-server:/dirA/dirB     /dirA/dirB    nfs
auto,rsize=16384,wsize=16384,hard,intr,users,exec,nfsvers=3,tcp,nolock,actimeo=0

Then on the client when the new kernel has booted:

ls /dirA/dirB      --> normal listing
ls /dirA/dirB/dirC   -->  Stale NFS file handle
ls /dirA/dirB/dirD   -->  Stale NFS file handle

I will do a few more builds/boots and check -rc3-git2 and -rc3-git3.

Will report back shortly,

Shane
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