** Description changed:
+ [ Impact ]
+
I found a reason of non-functioning resume from hibernation when resume
partition/file is autodetected by intiramfs hook /usr/share/initramfs-
tools/hooks/resume.
Here is the scenario:
1) hook /usr/share/initramfs-tools/hooks/resume creates config
conf/conf.d/zz-resume-auto saved in initrd image, containing one variable:
RESUME=UUID=106238b0-707d-4422-866d-a7534da50702 in my case
2) during boot init script sets 'resume' variable to 'RESUME' value from
conf/conf.d/zz-resume-auto, then it executes local-premount scripts
including local-premount/resume
3) resuming script local-premount/resume
(/usr/share/initramfs-tools/scripts/local-premount/resume) tries to get resume
device major-minor numbers by these lines:
DEV=$(readlink ${resume})
DEV=/sys/class/block/${DEV##*/}/dev
if [ -r "$DEV" ]; then
read MAJMIN < "$DEV"
fi
4) next check fails and resume process silently aborts:
if [ -z "$MAJMIN" ]; then
exit 1
fi
Resuming script fails to get device major-minor because
resume=UUID=106238b0-707d-4422-866d-a7534da50702 -- it's not resolved
into device path in init script.
Commonly mentioned workaround is to explicitly specify kernel parameter
resume=UUID=106238b0-707d-4422-866d-a7534da50702 -- only in this case
init script resolves it to device path.
+ [ Test Plan ]
+
+ 1. hibernate: `sudo systemctl hibernate`
+ 2. resume from hibernate
+ 3. `cat /sys/power/resume` should contain the major-minor of the swap
+
+ [ Other Info ]
+
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: initramfs-tools 0.130ubuntu3
Uname: Linux 4.16.6-041606-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat May 5 11:32:31 2018
InstallationDate: Installed on 2018-03-27 (38 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180327)
PackageArchitecture: all
SourcePackage: initramfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1769297
Title:
resume from hibernation broken when resume image is autodetected
(UUID= syntax used)
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