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[David <launchpad@xxxxxxxxxxxxxxxx>]

Installed a new host to test with and replicated the bug on it with
3.16.0-22-generic by installing a new VM - the Oops occurred during the
grub2 install.

Installed 3.18.0-031800rc1-generic but the system will not even allow a
VM to start, kworker and modprobe timeouts in kern.log.

** Tags added: kernel-unable-to-test-upstream

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https://bugs.launchpad.net/bugs/1384659

Title:
  NFSv3/TCP in 14.10 major issues and kernel NULL pointer dereference

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Upgraded a NFS client to 14.10. Server is running FreeBSD 10.0, no
  changes on server from when client was running 14.04. Client is using
  NFSv3 over TCP.

  Client hosts virtual machines - first virtual machine starts ok,
  second virtual machine starts but machine needs to fsck and reports
  timeouts, left overnight still cannot complete fsck. A simple "ls" of
  the NFS share hangs.

  3.16.0-22-generic kernel kern.log generates warning and the Oops with
  null pointer dereference (see attached).

  Tried mainline 3.16.6-031606-generic with same result (see attached).
  Same behaviour, fsck never finishes and ls hangs.

  Tried mainline 3.14.22-031422-generic and problem is gone, fsck
  finishes in several seconds, no problems with ls, machine and VMs
  running normally since.

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