We've just run into this after about 600 days of continual NFS use. It does appear to be load related. I can say anecdotally though that when swapping over from Ubuntu 14.04 to 14.04.3 we found it appearing more often, which lead me to this bug report. I've just disabled NFSv4 as was suggested.
We've just run into this after about 600 days of continual NFS use. It does appear to be load related. I can say anecdotally though that when swapping over from Ubuntu 14.04 to 14.04.3 we found it appearing more often, which lead me to this bug report. I've just disabled NFSv4 as was suggested.