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For the benefit of Canonical, this bug is likely related to LP bug
1546260 which is generally covering the issue with kexec issues causing
kdump to not work.

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https://bugs.launchpad.net/bugs/1544438

Title:
  ISST:LTE: LPAR roselp1 kexec_core from reboot command

Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0  2016-02-08 18:18:35 ==
  ---Problem Description---
  reboot from command line.
  kernel cores on booting.

  ---uname output---
  4.4.0-2-generic
   
  Machine Type = 8286-42A 
   
  ---System Hang---
   system hung.
  need to reboot via hmc
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   install machine with ubuntu
  setup generl post install scripts
  reboot command line
  fails on boot up
   
  Stack trace output:
   no
   
  Oops output:
   no
   
  System Dump Info:
    The system was configured to capture a dump, however a dump was not produced.
   

  == Comment: #1 -2016-02-08 18:19:27 ==

  
  root@roselp1:/kte/tools# reboot
  [  878.305097] kdump-tools[63102]: Stopping kdump-tools:  * unloaded kdump kernel


  Ubuntu 16.04.  .  .  .Ubuntu 16.04.  .  .  .Ubuntu 16.04.  .  .
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  kexec_core: Starting new kernel

  
  == Comment: #3 - 2016-02-08 18:28:40 ==

  > I am going to try to dump via hmc to capture kernel logs.
  hmc dump not working.  I am going to change the kernel command line from crash kernel to xmon and reproduce

  I can't even get it to dump to xmon.

  
  == Comment: #6 - 2016-02-09 05:25:54 ==
  (In reply to comment #5)

  > Please share kernel cmdline params.

  root@roselp1:~# cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinux-4.4.0-2-generic root=UUID=b0dee2d0-a2c9-43e2-a43b-70fec2cf6180 ro splash quiet xmon=on

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