"Failed unmounting "/{root,var/cache} error messages when shutting down

From	"Jorge P. de Morais Neto" <jorge+list@disroot.org>
Newsgroups	linux.debian.user
Subject	"Failed unmounting "/{root,var/cache} error messages when shutting down
Date	2022-01-20 13:00 +0100
Message-ID	<DHEgF-td-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi.  When I shutdown or halt my laptop, I see error messages like:

    [FAILED] Failed unmounting /root.
    [⋮]
    [FAILED] Failed unmounting /var/cache.
    [⋮]
    [  OK  ] Reached target Unmount All Filesystems.
    [  OK  ] Reached target Final Step.
             Starting halt...

My Nextcloud public folder has a screenshot:
https://cloud.disroot.org/s/MFaEoozaHHJjtbs

I suppose these Btrfs subvolumes do still get unmounted cleanly before
shutdown, because:
1. The success message "[  OK  ] Reached target Unmount All Filesystems."
2. When the laptop turns back on, I don't see any message about unclean
   filesystem.
3. In the output of ~smartctl -a /dev/nvme0n1~, the field "Unsafe
   Shutdowns" dos not increase.

Am I thinking correctly, and can I safely disregard those error messages?

For reference, here is the relevant excerpt from /etc/fstab

--8<---------------cut here---------------start------------->8---
LABEL=SSD /		     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@rootfs      0       0
LABEL=SSD /var/cache         btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-cache   0       0
LABEL=SSD /var/backups       btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-backups 0       0
LABEL=SSD /var/mail          btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-mail    0       0
LABEL=SSD /var/spool         btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-spool   0       0
LABEL=SSD /var/tmp           btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-tmp     0       0
LABEL=HDD /var/log	     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-log     0       0
LABEL=SSD /var/lib/libvirt/images btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@libvirt-images 0 0
LABEL=HDD /var/cache/apt/archives btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@apt-archives 0 0
LABEL=SSD /root	             btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~root       0       0
LABEL=SSD /home/jorge	     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~jorge      0       0
LABEL=SSD /home/jorge/.cache btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~jorge-.cache     0 0
LABEL=HDD /home/jorge/HDD    btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~jorge      0       0
LABEL=SSD /home/wanessa	     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~wanessa    0       0
LABEL=HDD /home/wanessa/HDD  btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~wanessa    0       0
LABEL=SSD /gnu		     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@guix-store  0       0
LABEL=SSD /var/guix	     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@guix-var    0       0
LABEL=SSD /usr/local	     btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@usr-local   0       0
--8<---------------cut here---------------end--------------->8---

Kind regards

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"Failed unmounting "/{root,var/cache} error messages when shutting  down "Jorge P. de Morais Neto" <jorge+list@disroot.org> - 2022-01-20 13:00 +0100

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