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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https://bugs.launchpad.net/bugs/1626149
Title:
yakkety 4.8, missing config CONFIG_USERFAULTFD=y
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