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

apport-collect 1626149

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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  yakkety 4.8, missing config CONFIG_USERFAULTFD=y

Status in linux package in Ubuntu:

Bug description:
  The 4.4 kernel has CONFIG_USERFAULTFD=y set, however for Yakkety 4.8
  it appears to be missing. This was picked up when running the stress-
  ng userfault stress tests:

  stress-ng --userfaultfd 1
  stress-ng: info:  [16383] defaulting to a 86400 second run per stressor
  stress-ng: info:  [16383] dispatching hogs: 1 userfaultfd
  stress-ng: info:  [16383] cache allocate: default cache size: 8192K
  stress-ng: error: [16384] stress-ng-userfaultfd: userfaultfd failed, errno = 
38 (Function not implemented)
  stress-ng: error: [16383] process 16384 (stress-ng-userfaultfd) terminated 
with an error, exit status=1
  stress-ng: info:  [16383] unsuccessful run completed in 0.00s

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