[Bug 1905166] [NEW] systemd-shutdown cannot detach DM

[Ingo Kueper]

Public bug reported:

when powering down the system systemd cannot unmount /

systemd-shutdown[1]: Could not detach DM /dev/dm-0: Device or resource busy
systemd-shutdown[1]: Failed to finalize  DM devices, ignoring
reboot: Power down

as a result at each startup the filesystem is checked:

Press Ctrl+C to cancel all filesystem checks in progress

If systemd cannot unmount / that might not be a problem but it should be
less noisy and not result in a filesystem check after each reboot.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: systemd 245.4-4ubuntu3.3
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Nov 22 11:40:05 2020
MachineType: Dell Inc. Latitude 7410
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-54-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: systemd
SystemdDelta:
 [EXTENDED]   /usr/lib/systemd/system/rc-local.service → /usr/lib/systemd/system/rc-local.service.d/debian.conf
 [EXTENDED]   /usr/lib/systemd/system/user at .service → /usr/lib/systemd/system/user at .service.d/timeout.conf
 
 2 overridden configuration files found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/11/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.1
dmi.board.name: 0M5G57
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 31
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.4.1:bd10/11/2020:svnDellInc.:pnLatitude7410:pvr:rvnDellInc.:rn0M5G57:rvrA00:cvnDellInc.:ct31:cvr:
dmi.product.family: Latitude
dmi.product.name: Latitude 7410
dmi.product.sku: 09CD
dmi.sys.vendor: Dell Inc.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1905166

Title:
  systemd-shutdown cannot detach DM

Status in systemd package in Ubuntu:
  New

Bug description:
  when powering down the system systemd cannot unmount /

  systemd-shutdown[1]: Could not detach DM /dev/dm-0: Device or resource busy
  systemd-shutdown[1]: Failed to finalize  DM devices, ignoring
  reboot: Power down

  as a result at each startup the filesystem is checked:

  Press Ctrl+C to cancel all filesystem checks in progress

  If systemd cannot unmount / that might not be a problem but it should
  be less noisy and not result in a filesystem check after each reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.3
  ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
  Uname: Linux 5.4.0-54-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.12
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Nov 22 11:40:05 2020
  MachineType: Dell Inc. Latitude 7410
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-54-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /usr/lib/systemd/system/rc-local.service → /usr/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /usr/lib/systemd/system/user at .service → /usr/lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/11/2020
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.4.1
  dmi.board.name: 0M5G57
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 31
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.4.1:bd10/11/2020:svnDellInc.:pnLatitude7410:pvr:rvnDellInc.:rn0M5G57:rvrA00:cvnDellInc.:ct31:cvr:
  dmi.product.family: Latitude
  dmi.product.name: Latitude 7410
  dmi.product.sku: 09CD
  dmi.sys.vendor: Dell Inc.

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