Public bug reported:

I'm experiencing input/output errors on mounting NFS-shares, starting
from kernel 4.9 and above.

No errors logged to syslog, but the system reports IO-errors when
reading from the mount after only a few seconds. Doesn't matter which
program that are accessing the disk.

My problems started after upgrading to ubuntu 17.04, but I have narrowed
it down to being present from ubuntu kernel 4.9 and above by installing
kernels from the ubuntu kernel ppa - i.e. when downgrading to latest
4.8-kernel from the PPA, NFS starts working as expected even on ubuntu
17.04. So it's definetely kernel related.

Probably not a hardware error either as the bug is present when NFS is
mounted over both eth0 and wlan0.

Only special thing in my setup is that NFS is mounted over an ssh-
tunnel.

The NFS server runs an completely up to date ubuntu 16.04 LTS install.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1687130

Title:
  NFS client input/output-error on kernel >=4.9

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I'm experiencing input/output errors on mounting NFS-shares, starting
  from kernel 4.9 and above.

  No errors logged to syslog, but the system reports IO-errors when
  reading from the mount after only a few seconds. Doesn't matter which
  program that are accessing the disk.

  My problems started after upgrading to ubuntu 17.04, but I have
  narrowed it down to being present from ubuntu kernel 4.9 and above by
  installing kernels from the ubuntu kernel ppa - i.e. when downgrading
  to latest 4.8-kernel from the PPA, NFS starts working as expected even
  on ubuntu 17.04. So it's definetely kernel related.

  Probably not a hardware error either as the bug is present when NFS is
  mounted over both eth0 and wlan0.

  Only special thing in my setup is that NFS is mounted over an ssh-
  tunnel.

  The NFS server runs an completely up to date ubuntu 16.04 LTS install.

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