Public bug reported:

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

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

** Tags: kernel-4.8

** Tags added: kernel-4.8

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  yakkety 4.8, missing config CONFIG_USERFAULTFD=y

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