Using henrix's -proposed kernel appears to resolve the issue for me.
Under 3.13.0-32-generic #56-Ubuntu, Kworker is no longer running away,
whereas before under *.30-generic #55 it was.
My setup is a server with a nfs client on a KVM VM coming in over
openvswitch. Restarting the NFS client VM
tags:added: verification-done-trusty
** Tags removed: verification-needed-trusty
** Tags added: verification-done-trusty
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https://bugs.launchpad.net/bugs/1322407
Title:
NFS kernel