Ubuntu
initramfs-tools package

  1. Bug #1769297
  2. Comment #0

Comment 0 for bug 1769297

Revision history for this message
Dmitriy Geels (dmig) wrote : resume from hibernation broken when resume image is autodetected

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) when 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

3) then 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.

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)