[Bug 1910252] Re: `systemctl hibernate` incorrectly reports "Not enough swap space for hibernation"

[Dan Watkins]

/sys/power/image_size represents the required amount of space for the
image; that said, the machine has 16G RAM total, so even if that were
maxed out, it would fit into 97.7G comfortably.

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Title:
  `systemctl hibernate` incorrectly reports "Not enough swap space for
  hibernation"

Status in systemd package in Ubuntu:
  New

Bug description:
  I have plenty of swap space configured in my system:

  $ cat /sys/power/image_size
  6642229248   # ~ 6.2GiB

  $ swapon
  NAME      TYPE       SIZE USED PRIO
  /dev/dm-2 partition  980M   0B   -2
  /dev/sda2 partition 97.7G   0B   -3

  But when I attempt to hibernate:

  $ sudo systemctl hibernate
  Failed to hibernate system via logind: Not enough swap space for hibernation

  I have the swap partition configured as my resume device in my kernel
  commandline:

  $ cat /proc/cmdline
  BOOT_IMAGE=/vmlinuz-5.8.0-33-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash resume=UUID=73909634-a75d-42c9-8f66-a69138690756 pcie_aspm=off vt.handoff=7
  $ ls -l /dev/disk/by-uuid/73909634-a75d-42c9-8f66-a69138690756
  lrwxrwxrwx 1 root root 10 Jan  5 09:08 /dev/disk/by-uuid/73909634-a75d-42c9-8f66-a69138690756 -> ../../sda2

  (I'm not really sure how to further debug my issue, any assistance
  would be appreciated!)

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: systemd 246.6-1ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17
  Uname: Linux 5.8.0-33-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu50.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Jan  5 09:33:04 2021
  InstallationDate: Installed on 2019-05-07 (608 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  MachineType: Gigabyte Technology Co., Ltd. B450M DS3H
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-33-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash resume=UUID=73909634-a75d-42c9-8f66-a69138690756 pcie_aspm=off vt.handoff=7
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user at .service → /lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  SystemdFailedUnits:
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
   ------
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
  UpgradeStatus: Upgraded to groovy on 2020-06-22 (196 days ago)
  dmi.bios.date: 01/25/2019
  dmi.bios.release: 5.13
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F4
  dmi.board.asset.tag: Default string
  dmi.board.name: B450M DS3H-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF4:bd01/25/2019:br5.13:svnGigabyteTechnologyCo.,Ltd.:pnB450MDS3H:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB450MDS3H-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: B450M DS3H
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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