[Bug 1705054] Re: Trusty kexec-tools suffer from upstream code regression. Fix not included.

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https://bugs.launchpad.net/bugs/1705054

Title:
  Trusty kexec-tools suffer from upstream code regression. Fix not
  included.

Status in kexec-tools package in Ubuntu:
  Confirmed

Bug description:
  [Impact]

   * kdump doesn't work on non-efi systems
   * a kernel dump can't be generated

  [Test Case]

   * install kdump-tools
   * configure kdump-tools (/etc/default/kdump-tools)
   * try to start kdump-tools service (kdump-config start)
   * while executing kexec, you will get:
     "efi memory descriptor version 0 is not supported!"

  [Regression Potential]

   * in theory it could brake kdump for efi systems
   * in practice, its based on upstream regression fix (not included in Trusty)
   * it has also been tested in 3 different setups and it worked

  [Other Info]

  Based on upstream code commit explanation:

  """
  On non-EFI systems, efi_info section of boot_params is zero filled resulting
  in an erroneous message from kexec regarding "efi memory descriptor" version.

  Caused by commit: e1ffc9e9a0769e1f54185003102e9bec428b84e8 "Passing efi related
  data via setup_data"

  # od -j 448 -N 32 -v -x /sys/kernel/boot_params/data
  0000700 0000 0000 0000 0000 0000 0000 0000 0000
  0000720 0000 0000 0000 0000 0000 0000 0000 0000
  0000740

  # kexec -l --reuse-cmdline --initrd=/boot/initrd-`uname -r` /boot/vmlinuz-`uname -r`
  efi memory descriptor version 0 is not supported!
  """

  It was brought to my attention to some of our users are facing this:

  ----
  ## TRUSTY with kernel 4.4.0-83-generic

  # /usr/sbin/kdump-config load
  efi memory descriptor version 0 is not supported!
  * loaded kdump kernel

  /var/log/syslog:

  Jul 18 13:37:06 xxxx kdump-config: /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-4.4.0-83-generic root=UUID=xxxxxxxx-20e4-4325-ad92-7aef2af0beac ro KDUMP_CMDLINE_APPEND=irqpoll maxcpus=1 nousb irqpoll maxcpus=1 nousb" --initrd=/boot/initrd.img-4.4.0-83-generic /boot/vmlinuz-4.4.0-83-generic
  Jul 18 13:37:06 xxxx kdump-config: loaded kdump kernel
  ----

  Despite the message of kdump being loaded, it doesn't look that it is
  operational. Dump files could be generated using Xenial kdump-tools,
  but not Trusty's.

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