** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
       Status: Incomplete

** Changed in: linux (Ubuntu Yakkety)
       Status: Incomplete => In Progress

** Changed in: linux (Ubuntu Yakkety)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Yakkety)
       Status: In Progress => Fix Committed

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  yakkety 4.8, missing config CONFIG_USERFAULTFD=y

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Committed

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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