This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1686099

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1686099

Title:
  connection flood to port 445 on mounting cifs volume under kernel

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This is identical to the bug reported on the Debian kernel list, only
  I'm running 4.4.0, not 4.[89].0

  After about 15 mintues, the cifsd daemon starts flooding echo requests
  on port 445 to the windows server causing a constant 1MB/s load
  (around 10,000 packets per second) that eventually leads to system
  instability that forces a reboot to correct.  This is repeatable and
  as far as I know started about a week ago (possibly with the
  installation of 4.4.0-75).

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=856843

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