This was introduced with upstream stress-ng commit:

commit f954db3afe8ae2dc9474908250d3a2c595200a94
Author: Colin Ian King <colin.k...@canonical.com>
Date:   Wed Jun 7 20:01:16 2017 +0100

    stress-vforkmany: remove as many calls as possible
    
    We should remove as many function calls so we don't clobber the stack.
    
    Signed-off-by: Colin Ian King <colin.k...@canonical.com>

..the code added a wrapper process to ensure that kill'd vfork children
were respawned, however, the non-OOM-able setting on the vfork processes
were causing the OOM killer to reap everything except the vfork
children.

I've fixed this with upstream fix:

http://kernel.ubuntu.com/git/cking/stress-
ng.git/commit/?id=5f3c93335def9985d479e891f3eb5939c1dd3797

This now makes vfork processes OOM-able by default.

** Package changed: linux (Ubuntu) => stress-ng (Ubuntu)

** Changed in: stress-ng (Ubuntu)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1698747

Title:
  "vforkmany" test in the smoke test test suite will stuck on Xenial
  i386

Status in stress-ng package in Ubuntu:
  Fix Committed

Bug description:
  I tried it twice on our node "gonzo" for regression-testing, but it
  always stuck on the same task  (over 1 day)

  ERROR - 06:10:35 DEBUG| [stdout] urandom RETURNED 0
  ERROR - 06:10:35 DEBUG| [stdout] urandom PASSED
  ERROR - 06:10:35 DEBUG| [stdout] userfaultfd STARTING
  ERROR - 06:10:45 DEBUG| [stdout] userfaultfd RETURNED 0
  ERROR - 06:10:45 DEBUG| [stdout] userfaultfd PASSED
  ERROR - 06:10:45 DEBUG| [stdout] utime STARTING
  ERROR - 06:10:55 DEBUG| [stdout] utime RETURNED 0
  ERROR - 06:10:55 DEBUG| [stdout] utime PASSED
  ERROR - 06:10:55 DEBUG| [stdout] vfork STARTING
  ERROR - 06:11:05 DEBUG| [stdout] vfork RETURNED 0
  ERROR - 06:11:05 DEBUG| [stdout] vfork PASSED
  ERROR - 06:11:05 DEBUG| [stdout] vforkmany STARTING
  ERROR - Killed
  ERROR - 
  ERROR - Due to the above error(s), this script is unable to continue and is 
terminating.

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