[Bug 1876570] [NEW] Could not resume from hibernation when swap is specified as device

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You have been subscribed to a public bug by Sebastien Bacher (seb128):

I originally experienced this on Pop!_OS but I have reproduced it on a
freshly installed Ubuntu.

1. Ubuntu 20.04 LTS
2. initramfs-tools-core 0.136ubuntu6
3. I expect the system to resume from hibernation when running pm_hibernate
4. The system starts up anew when I try to resume

I have setup a swap partition on /dev/vda2 in /etc/fstab. To enable
hibernate I added the kernel parameter "resume=/dev/vda2" to
GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and run update-grub.

>From debugging initramfs it tries to follow a symbolic link

DEV=$(readlink "$resume")
(see /usr/share/initramfs-tools/scripts/local-premount/resume, line 35)

which works well when swap is specified with uuid. When swap is
specified as a device directly the readlink returns an empty string and
the system does not resume from hibernation.

To verify this I added the parameter -f to readlink and run "update-
initramfs -u". The system now hibernates successfully.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: initramfs-tools 0.136ubuntu6
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun May  3 13:26:02 2020
InstallationDate: Installed on 2020-05-03 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: initramfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal patch
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Could not resume from hibernation when swap is specified as device
https://bugs.launchpad.net/bugs/1876570
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