[Bug 1905166] Re: systemd-shutdown cannot detach DM

[Dan Streetman]

please reboot with this kernel boot parameter added:

systemd.log_level=debug

Then let the system boot up, and then perform a shutdown, to reproduce
the problem. Then start the system back up (you can remove the kernel
boot parameter) and capture the previous boot's journal, which should
include the problem reproduction while debug is enabled; you can use the
command:

$ journalctl -k -b -1 > /tmp/lp1905166.log

which will capture the log output from the previous boot.

** Changed in: systemd (Ubuntu)
       Status: Confirmed => Incomplete

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

Title:
  systemd-shutdown cannot detach DM

Status in systemd package in Ubuntu:
  Incomplete

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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