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results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag 'verification-needed-artful' to 'verification-failed-
artful'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

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** Tags added: verification-needed-artful

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https://bugs.launchpad.net/bugs/1747069

Title:
  artful 4.13 i386 kernels crash after memory hotplug remove

Status in linux package in Ubuntu:
  In Progress

Bug description:
  == SRU Request, Artful ==

  Hotplug removal causes i386 crashes when exercised with the kernel
  selftest mem-on-off-test script.  

  == Fix ==

  Revert commit f1dd2cd13c4b (""mm, memory_hotplug: do not associate
  hotadded memory to zones until online")

  Note: A fix occurs in 4.15 however this requires a large set of
  changes that are way too large to be SRU'able and the least risky way
  forward is to revert the offending commit.

  == Testcase ==

  Running the kernel selftest script mem-on-off-test.sh, followed by a
  sync, followed by re-installing kernel packages will always trigger
  this issue. Simply running the mem-on-off-test.sh script sometimes
  won't trigger the problem.  I believe this is why we've not seen this
  happen too frequently with our ADT tests.  I can reproduce this in a
  VM with 4 CPUs and 2GB of memory.

  == Regression Potential ==

  Reverting this commit does remove some functionality, however this
  does not regress the kernel compared to previous releases and having a
  working reliable memory hotplug is the preferred option.  This fix
  does touch some memory hotplug, so there is a risk that this may break
  this functionality that is not covered by the kernel regression
  testing.

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