Hi Leonardo,
thanks for your efforts trying to verify that.
Given that you couldn't trigger it I wonder what to do.
Currently it is incomplete waiting for such a test, but as it seems to elude 
you I'd suggest we call the bug invalid until we would know otherwise.

For the related bug 1781526 I would think it faces a similar destiny.
There also the test/verification kind of left us with Jhopper.
It was said that this bug here might occur more often if 1781526 would be 
While we couldn't trigger the bug here, I'm reluctant to push a nice but minor 
performance fix while we know it might trigger more crashes.

Therefore I'll set BOTH bugs to invalid and would ask the kernel Team to
stop working on this one here until one can provide a working

** Changed in: linux (Ubuntu Cosmic)
       Status: In Progress => Invalid

** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Invalid

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

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  Avoid migration issues with aligned 2MB THB

Status in The Ubuntu-power-systems project:
Status in linux package in Ubuntu:
Status in qemu package in Ubuntu:
Status in linux source package in Bionic:
Status in linux source package in Cosmic:

Bug description:
  FYI: This blocks bug 1781526 - once this one here is resolved we can
  go on with SRU considerations for 1781526

  ------- Comment From jhop...@us.ibm.com 2018-08-20 17:12 EDT-------

  Hi, in some environments it was observed that this qemu patch to
  enable THP made it more likely to hit guest migration issues, however
  the following kernel patch resolves those migration issues:

  KVM: PPC: Book3S HV: Use correct pagesize in kvm_unmap_radix()

  Once merged upstream, it would be good to include that change as well
  to avoid potential migration problems. Should I open a new bug for
  that or is it better to track here?

  Note Paelzer: I have not seen related migration issues myself, but it
  seems reasonable and confirmed by IBM.

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