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[Launchpad Bug Tracker <1818150@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ec2-hibinit-agent -
1.0.0-0ubuntu4~18.04.0

---------------
ec2-hibinit-agent (1.0.0-0ubuntu4~18.04.0) bionic; urgency=medium

  * Backport to Bionic (LP: #1812166)

ec2-hibinit-agent (1.0.0-0ubuntu4) disco; urgency=medium

  * Update grub configuration snippet even when it exists but has outdated
    content

ec2-hibinit-agent (1.0.0-0ubuntu3) disco; urgency=medium

  * Refer to root partition in resume=... the same way as GRUB2 refers to it
    (LP: #1818150)

ec2-hibinit-agent (1.0.0-0ubuntu2) disco; urgency=medium

  * debian/gbp.conf: Use ubuntu/ prefix for tags
  * Silence swapoff when purging the package
  * Detect disabled hibernation with Python 3's urllib, too. (LP: #1817926)

ec2-hibinit-agent (1.0.0-0ubuntu1) disco; urgency=medium

  * Initial release based on packaging of hibagent

 -- Balint Reczey <rbalint@xxxxxxxxxx>  Fri, 01 Mar 2019 23:08:55 +0100

** Changed in: ec2-hibinit-agent (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** Changed in: ec2-hibinit-agent (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1818150

Title:
  Hibinit-agent configures GRUB referring to root partition as
  resume=/dev/root

Status in ec2-hibinit-agent package in Ubuntu:
  Fix Released
Status in ec2-hibinit-agent source package in Trusty:
  Won't Fix
Status in ec2-hibinit-agent source package in Xenial:
  Fix Released
Status in ec2-hibinit-agent source package in Bionic:
  Fix Released
Status in ec2-hibinit-agent source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

   * The kernel can't find /dev/root when booting initramfsless thus can't resume from hibernation
   * The fix sets resume=... to the same identifier passed as root=... on the kernel command when the swap file is found to be on /dev/root.

  [Test Case]

   * (Install and) start hibinit-agent on an EC2 instance supporting hibernation, then when it started successfully verify the grub configuration:
  $ grep -m 1 root= /boot/grub/grub.cfg
     linux	/boot/vmlinuz-4.18.0-1008-aws root=PARTUUID=6b4ea835-01 ro  console=tty1 console=ttyS0 nvme.io_timeout=4294967295 no_console_suspend=1 resume_offset=438272 resume=PARTUUID=6b4ea835-01

    resume=... must not refer to /dev/root with the default
  configuration, but to a block device known to the kernel without using
  initramfs.

  [Regression Potential]

   * Hibinit-agent may parse the grub configuration file incorrectly and
  set a wrong partition to resume from. Since the fix is quite small and
  the number of variants of grub configurations is also small this
  regression is unlikely.

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