"Failed unmounting /var/cache" error message when shutting down
Hi. This problem is some months old, and I have sent a similar message
on 20 Jan 2022 11:57:35 (UTC). Since then I have slightly simplified my
Btrfs subvolume layout but the problem remains.
When I shutdown or halt my laptop, I get error messages like:
[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 from January:
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, I have attached the relevant excerpt from /etc/fstab
Kind regards
LABEL=SSD / btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@rootfs 0 0
LABEL=SSD /var/backups btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-bkp 0 0
LABEL=SSD /var/cache btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-cch 0 0
LABEL=SSD /var/spool btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@var-spl 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=HDD /var/cache/apt/archives btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@apt-arch 0 0
LABEL=HDD /root btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@~root 0 0
LABEL=SSD /home btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@home 0 0
LABEL=SSD /home/cache btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@home-cch 0 0
LABEL=HDD /home-HDD btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@home 0 0
LABEL=HDD /home-HDD/cache btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@home-cch 0 0
LABEL=SSD /gnu btrfs noatime,space_cache=v2,compress=zstd:12,subvol=@guix-gnu 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
UUID=9550-C451 /boot/efi vfat umask=0077 0 1
LABEL=HDD-swap none swap sw 0 0
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