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[Haw Loeung <1425699@xxxxxxxxxxxxxxxxxx>]

We ran into this while setting up an OpenStack cloud using IBM POWER8
machines[1]. Unfortunately, hwe-v for Trusty isn't available
(LP:1504066) but hwe-u does indeed fix the "Oops: Exception in kernel
mode, sig: 4 [#47]" boot loop we ran into.

Since it's been advised here, and in several other bugs that
POWER8/ppc64el doesn't work with the main Trusty 3.13 kernel, perhaps we
could make MAAS images default to hwe-u and above for ppc64el?

[1]http://paste.ubuntu.com/12713436/

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https://bugs.launchpad.net/bugs/1425699

Title:
  kernel panic on IBM Power8 PPC MAAS ephemeral image

Status in maas-images:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

Bug description:
  The kernel running on the 14.04 ephemeral image for MAAS when
  commissioning an IBM Power8 PPC server causes a periodic kernel panic.

  This happens intermittently and cannot be forcefully reproduced.

  The kernel version on the image is 3.13.0-27.50-generic according to
  the boot process.

  Attached is the boot process log with the kernel panics.

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