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[Launchpad Bug Tracker <1896638@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ec2-hibinit-agent -
1.0.0-0ubuntu4~18.04.5

---------------
ec2-hibinit-agent (1.0.0-0ubuntu4~18.04.5) bionic; urgency=medium

  * Always set resume device by PARTUUID instead of by device name.
    Based on patch by Francis Ginther. (LP: #1896638)

 -- Balint Reczey <rbalint@xxxxxxxxxx>  Tue, 03 Nov 2020 19:41:35 +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/1896638

Title:
  Path to swapfile doesn't use a static device path

Status in ec2-hibinit-agent package in Ubuntu:
  Fix Released
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 Focal:
  Fix Released
Status in ec2-hibinit-agent source package in Groovy:
  Fix Released

Bug description:
  [Impact]

  * Using the device name on the kernel cmdline in the resume= option
  leads to failure to resume from hibernation when the device name is
  not stable, which can be the case for nvme drives.

  [Test Case]

  * Set up an EC2 instance to allow hibernation
  * Wait for hibinit-agent.service fully started
  * /etc/default/grub.d/99-set-swap.cfg should refer to the resume= partition by PARTUUID

  [Regression Potential]

  * Failure to discover PARTUUID makes the system unable to resume. A
  potential crash would cause the system unable to set up hibernation or
  unable to resume. (On Focal PARTUUID is already in use, even without
  this fix.)

  [Original Bug Text]

  When the agent inserts the resume device path and offset into the
  kernel cmdline, it uses device names such as the following:

  `resume_offset=223232 resume=/dev/nvme1n1p1`

  The issue is that `/dev/nvme1n1p1` is not static. On the reboot, the
  block device may appear at `/dev/nvme0n1p1` resulting in failure to
  find the swapfile used to suspend.

  The solution should be to use a persistent block device naming scheme.

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