On Wed, Apr 07, 2010 at 03:04:46PM -0700, Linus Torvalds wrote:

> > Bug-Entry   : http://bugzilla.kernel.org/show_bug.cgi?id=15674
> > Subject             : [2.6.34-rc2 NFS4 oops] open error path failure...
> > Submitter   : Daniel J Blueman <daniel.blue...@gmail.com>
> > Date                : 2010-03-29 18:36 (10 days old)
> > Message-ID  : <6278d2221003291136p6481fe8emfb039403343c...@mail.gmail.com>
> > References  : http://marc.info/?l=linux-kernel&m=126988782722711&w=2
> 
> This smells like the same LOOKUP_DIRECTORY thing as the first entry, but.. 

No, it's not the same thing; the fix is to have nfs ->d_revalidate()
return an error on failing open attempt (in insane codepath that has
->d_revalidate() handling open()).  Confirmed to work by reporter...

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d79a7b3..fe0cd9e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2068,8 +2068,7 @@ nfs4_open_revalidate(struct inode *dir, struct dentry 
*dentry, int openflags, st
                        case -EDQUOT:
                        case -ENOSPC:
                        case -EROFS:
-                               lookup_instantiate_filp(nd, (struct dentry 
*)state, NULL);
-                               return 1;
+                               return PTR_ERR(state);
                        default:
                                goto out_drop;
                }

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