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[Launchpad Bug Tracker <1364427@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/kexec-tools

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https://bugs.launchpad.net/bugs/1364427

Title:
  kexec-tools: kexeced kernel hung

Status in “kexec-tools” package in Ubuntu:
  Fix Released
Status in “kexec-tools” source package in Trusty:
  Fix Committed
Status in “kexec-tools” source package in Utopic:
  Fix Released

Bug description:
  SRU Justification:

  [Impact]
  Users of ppc64el hardware need the ability to use kexec kernels.

  [Test Case]
  1) apt-get install kexec-tools
  2) sudo kexec -l /boot/vmlinux --initrd=/boot/initrd.img
  3) sudo kexec -e
  4) Kernel should kexec into current kernel and work

  [Regression Potential]
  This patch backports the following patches from upstream kexec-tools:

  7bb7c2a4bae8 kexec/ppc64: Handle reserved memory ranges
  d8847573a40f kexec/ppc64: Fix up ELF header and dt for PowerNV
  90853885a859 ppc64/purgatory: Device tree values should be
  2ca220389d21 kexec/ppc64: move to device tree version 17
  335bad77fb07 kexec/ppc64: disabling exception handling when
  45b33eb2e70c ppc64/kdump: Fix ELF header endianess

  These are all specific to POWER architecture.

  --

  ---Problem Description---
  kexec is not working with kernel 3.16 or later.

  The root cause is missing patch in the kexec-tools package provided
  with Ubuntu 14.04 and 14.10.

  ---uname output---
  Linux qemu 3.16.0-10-generic #15-Ubuntu SMP Thu Aug 21 16:32:31 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux

  Machine Type = P8

  ---Steps to Reproduce---
  On a 14.10 guest or host, run :
  $ sudo kexec -l /boot/vmlinux --initrd=/boot/initrd.img-3.16.0-10-generic
  $ sudo kexec -e

  The kexeced kernel will hang here :
  [  300.002862] Starting new kernel
  I'm in purgatory

  The root cause is the following kexec-tools's patch missing:
  2ca220389d21 kexec/ppc64: move to device tree version 17

  This patch is required to kexec kernel 3.16 and later.

  Among this patch, the following upstream pactches should be added to the current package  :
  335bad77fb07 kexec/ppc64: disabling exception handling when building the purgato
  90853885a859 ppc64/purgatory: Device tree values should be read/stored in Big En

  In addition the following incoming patch should be applied :
  ppc64/kdump: Fix ELF header endianess (http://lists.infradead.org/pipermail/kexec/2014-July/012247.html)

  Another option to consider is to move to kexec-tools 2.0.7, and to
  apply the missing patches

  Is it possible to get this patches also applied to the kexec-tools
  shipped with 14.04 ?

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