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[Launchpad Bug Tracker <1661363@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package kexec-tools -
1:2.0.16-1ubuntu1~16.04.1

---------------
kexec-tools (1:2.0.16-1ubuntu1~16.04.1) xenial; urgency=low

  * Backport latest kexec-tools from bionic to xenial (LP: #1743529).

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Fri, 23 Feb
2018 12:11:36 -0300

** Changed in: kexec-tools (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1661363

Title:
  Fails to load compressed kernels on arm64

Status in kexec-tools package in Ubuntu:
  Fix Released
Status in kexec-tools source package in Xenial:
  Fix Released
Status in kexec-tools source package in Yakkety:
  Fix Committed

Bug description:
  [Impact]
  kexec-tools will not load a compressed kernel on arm64. Ubuntu ships compressed kernel images on arm64 starting with 16.10 (and hwe kernels for 16.04). A workaround is to manually decompress the kernel before loading it, but this is not supported by the use-kexec-for-reboot-by-default feature of the kexec-tools package.

  [Test Case]
  ubuntu@ubuntu:~$ sudo file /boot/vmlinuz-4.9.0-15-generic
  /boot/vmlinuz-4.9.0-15-generic: gzip compressed data, max compression, from Unix
  ubuntu@ubuntu:~$ sudo kexec -d -l /boot/vmlinuz-4.9.0-15-generic -t Image
  arch_process_options:141: command_line: (null)
  arch_process_options:143: initrd: (null)
  arch_process_options:144: dtb: (null)
  kernel: 0xffff8ff61010 kernel_size: 0x6ee18b
  get_memory_ranges_iomem_cb: 0000000040000000 - 00000000ffffbfff : System RAM
  get_memory_ranges_iomem_cb: 0000000100000000 - 000000013858ffff : System RAM
  get_memory_ranges_iomem_cb: 0000000138750000 - 000000013bc1ffff : System RAM
  get_memory_ranges_iomem_cb: 000000013c000000 - 000000013fffffff : System RAM
  image_arm64_probe: Bad arm64 image header.
  elf_arm64_probe: Not an ELF executable.
  image_arm64_probe: Bad arm64 image header.
  Cannot determine the file type of /boot/vmlinuz-4.9.0-15-generic

  [Regression Risk]
  kexec-tools did not support arm64 until zesty so, assuming the fix is localized to arm64 code, regression risk is negligible.

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