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to the lock_owner4 string that goes on the wire. Also, add code to do a ReleaseLockOwner Op on the lock_owner4 string before a Close. Apparently not all NFSv4 servers handle multiple instances of the same lock_owner4 string, at least not in a compatible way. This patch avoids having multiple instances, except for one unusual case, which will be fixed by a future commit. Found at the recent NFSv4 interoperability Bakeathon. Tested by: tdh at excfb.com MFC after: 2 weeks