On Tue, Aug 14, 2012 at 06:04:08PM +0000, Myklebust, Trond wrote:
> > Is this a known BUG ?
> > Which other information or test can I do to contribute searching/resolving this issue?
>
> I'm not 100% certain, but it looks to me as if the call to dget_parent()
> in nfs_lookup_revalidate is returning NULL.
>
> Could you please apply the following patch, and see if that triggers the
> WARN_ON instead of the above Oops?
Unlikely as hell. dget_parent() has only one return in it, and it's
BUG_ON(!ret->d_count);
ret->d_count++;
spin_unlock(&ret->d_lock);
return ret;
so it's extremely unlikely that it would managed to return NULL. Not
without oopsing...
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