Comment # 9 on bug 909634 from Neil Brown

(sorry for the delay).

It looks like the client is holding a delegation from the server, the server is
rejecting use of the delegation (maybe because the client was suspended for a
while and didn't renew the delegation) and the client isn't responding to the
error properly.

There are a few upstream patches that could be relevant (Deal with NFS state
management errors) and were marked for inclusion in -stable kernels, but didn't
get into 3.16 because it was closed for new patches by the time they came
along.

In particular, 

commit 4dfd4f7af0afd201706ad186352ca423b0f17d4b
Author: Trond Myklebust <trond.myklebust@primarydata.com>
Date:   Fri Oct 17 15:10:25 2014 +0300

    NFSv4: Ensure that we remove NFSv4.0 delegations when state has expired


looks like it might be relevant.

I have added 5 'stable' patches to our 13.2 kernel including this one.

The new kernel should appear in
 
http://download.opensuse.org/repositories/Kernel:/openSUSE-13.2/standard/x86_64/

in a day or so.  The current kernel version is 3.16.7-47.1.gf9c15b3.
When that changes, the NFS patches will be included.

Please try installing that kernel and report if it makes a difference.