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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1421391

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1421391

Title:
  can't kdump in trusty ec2 instance

Status in linux package in Ubuntu:
  Incomplete

Bug description:

  [Impact]

  I can't get a crash dump in an ec2 trusty instance. When it kexecs, I
  see the following backtrace:

  [    0.813826] ------------[ cut here ]------------
  [    0.817517] WARNING: CPU: 0 PID: 1 at /build/buildd/linux-3.13.0/arch/x86/mm/ioremap.c:102 __ioremap_caller+0x374/0x380()
  [    0.823494] Modules linked in:
  [    0.825807] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-44-generic #73-Ubuntu
  [    0.829917] Hardware name: Xen HVM domU, BIOS 4.2.amazon 12/03/2014
  [    0.833266]  0000000000000009 ffff8800362f1c18 ffffffff81720d86 0000000000000000
  [    0.838861]  ffff8800362f1c50 ffffffff810677cd ffffea0000ff0640 000000000003fc19
  [    0.844463]  000000003fc19000 000000000003fc19 0000000000001000 ffff8800362f1c60
  [    0.850005] Call Trace:
  [    0.851708]  [<ffffffff81720d86>] dump_stack+0x45/0x56
  [    0.854563]  [<ffffffff810677cd>] warn_slowpath_common+0x7d/0xa0
  [    0.857735]  [<ffffffff810678aa>] warn_slowpath_null+0x1a/0x20
  [    0.860855]  [<ffffffff81056ba4>] __ioremap_caller+0x374/0x380
  [    0.864047]  [<ffffffff8104b528>] ? copy_oldmem_page+0x48/0xc0
  [    0.867193]  [<ffffffff81056be4>] ioremap_cache+0x14/0x20
  [    0.870123]  [<ffffffff8104b528>] copy_oldmem_page+0x48/0xc0
  [    0.873223]  [<ffffffff81231fd4>] read_from_oldmem.part.0+0xa4/0xe0
  [    0.876534]  [<ffffffff8123222b>] elfcorehdr_read_notes+0x1b/0x20
  [    0.879797]  [<ffffffff81d66809>] merge_note_headers_elf64.constprop.7+0x71/0x24a
  [    0.883949]  [<ffffffff81d67188>] ? vmcore_init.part.4+0x55d/0x55d
  [    0.887380]  [<ffffffff81d66dbd>] vmcore_init.part.4+0x192/0x55d
  [    0.890670]  [<ffffffff81d67188>] ? vmcore_init.part.4+0x55d/0x55d
  [    0.894075]  [<ffffffff81d671b9>] vmcore_init+0x31/0x33
  [    0.897022]  [<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
  [    0.900121]  [<ffffffff81089555>] ? parse_args+0x225/0x3f0
  [    0.903231]  [<ffffffff81d360f6>] kernel_init_freeable+0x17b/0x200
  [    0.906683]  [<ffffffff81d358e5>] ? do_early_param+0x88/0x88
  [    0.909814]  [<ffffffff8170f250>] ? rest_init+0x80/0x80
  [    0.912777]  [<ffffffff8170f25e>] kernel_init+0xe/0x130
  [    0.915648]  [<ffffffff817317bc>] ret_from_fork+0x7c/0xb0
  [    0.918684]  [<ffffffff8170f250>] ? rest_init+0x80/0x80
  [    0.921565] ---[ end trace 8b6e218b41648bbd ]---

  [ Test Case ]

  boot ec2 trusty instance
  sudo apt-get install linux-crashdump
  sudo sed -i 's/USE_KDUMP=0/USE_KDUMP=1/' /etc/default/kdump-tools
  sudo reboot
  sudo kdump-config show
  echo c | sudo tee /proc/sysrq-trigger

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