PATCH: http://patches.gluster.com/patch/6293 in master (NFS : Send error reply on rpc decoding failure.)
Gaurav, can you please update the target milestone and the testplan for this bug.
To verify this bug, you need to send corrupted rpc packet from NFS client. We should be able to send error reply with GARBAGE_ARGS. I am not sure how would you do this, since we don't have any tool to change the on wire packets.
creating a corrupted packet is corner case and hence leaving this bug in same state as it is and will reopen if something of this sort happens again.