This is a me too. We encountered the same problem, with the exact same message of a tainted and hung nfsd task. Like yuhldr (yuh) we investigated and problem happens regularly.
In our case, we have a smallish cluster (100 machines) with a gigabit ethernet switch network. The nfsd machine serves the cluster as storage pool. We just installed netdata (a nagios like server monitor tool) the day before and suspect that was our root cause as we had not experienced this hang for a few weeks before that after bringing up a new cloudstack configuraiton on this cluster of machines. We disabled netdata and have not seen a reoccurance for 24 hours, though we are still monitoring. We did not try suggestion to set nfsversion to 3, but we may do that if we decide we would like to get netdata back on this machine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2062568 Title: nfsd gets unresponsive after some hours of operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/2062568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
