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

[Jo Liss]

> for those affected, does this happen every boot/shutdown?

Yes, I'm getting the following messages on Hirsute at the end of every
shut down (or reboot):

[   OK  ] Reached target Reboot.
[   timestamp] XFS: attr2 mount option is deprecated.
[   timestamp] sd-umoun[2337]: Failed to unmount /oldroot: Device or resource busy
[   timestamp] sd-umoun[2337]: Failed to unmount /oldroot/sys: Device or resource busy
[   timestamp] shutdown[1]: Could not detach DM /dev/dm-1:  Device or resource busy
[   timestamp] shutdown[1]: Could not detach DM /dev/dm-0:  Device or resource busy
[   timestamp] shutdown[1]: Failed to finalize file systems, DM devices, ignoring.

> is this a 'standard' installation, using the standard iso?

Yes, this was installed using a nightly hirsute-live-server-amd64.iso,
with disk encryption enabled during installation.

> what do you have mounted? what's the output of 'mount' and the output
of 'lsblk'?

# mount
...
/dev/mapper/ubuntu--vg-ubuntu--lv on / type xfs (rw,noatime,attr2,inode64,logbufs=8,logbsize=32k,noquota)
/dev/nvme0n1p2 on /boot type ext4 (rw,relatime)
/dev/nvme0n1p1 on /boot/efi type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
...

Full mount output at
https://gist.githubusercontent.com/joliss/c13e728ee039a2440e98f7ba6dd7ecd8/raw/25678bdaa17707a41b81b61c0fc648e01968ca90/mount

# lsblk
NAME                        MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
loop0                         7:0    0 99.2M  1 loop  /snap/core/10908
loop1                         7:1    0 25.9M  1 loop  /snap/heroku/4037
loop2                         7:2    0   72M  1 loop  /snap/lxd/19766
loop3                         7:3    0 55.5M  1 loop  /snap/core18/1988
loop4                         7:4    0 32.3M  1 loop  /snap/snapd/11107
loop5                         7:5    0 32.3M  1 loop  /snap/snapd/11402
loop6                         7:6    0 68.7M  1 loop  /snap/lxd/19823
nvme0n1                     259:0    0  1.8T  0 disk
├─nvme0n1p1                 259:1    0  512M  0 part  /boot/efi
├─nvme0n1p2                 259:2    0    1G  0 part  /boot
└─nvme0n1p3                 259:3    0  1.8T  0 part
  └─dm_crypt-0              253:0    0  1.8T  0 crypt
    └─ubuntu--vg-ubuntu--lv 253:1    0  1.8T  0 lvm   /

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1905166/+subscriptions