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[SOLVED]systemd-gpt-auto-generator via btrfs(dmesg warnings)
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nurali
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Joined: 17 Nov 2022
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PostPosted: Sun Apr 21, 2024 4:08 am    Post subject: [SOLVED]systemd-gpt-auto-generator via btrfs(dmesg warnings) Reply with quote

Hello all:
I noticed this very long time ago,but it was(and is) harmless(I think,system runs without any problem),so I didn't do anything about it.
Recent days I wanted (tryied to) fix it,but unfortunately,I realize that I overestimated myself.
So I want to get some lessons and maybe solution on this:
Code:

ali@gentoo ~ $ dmesg | grep systemd-gpt
[    4.438852] systemd-gpt-auto-generator[360]: File system behind root file system is reported by btrfs to be backed by pseudo-device /dev/root, which is not a valid userspace accessible device node. Cannot determine correct backing block device.
[    4.440358] (sd-exec-[354]: /usr/lib/systemd/system-generators/systemd-gpt-auto-generator failed with exit status 1.

lsblk -f:
Code:

ali@gentoo ~ $ lsblk -f
NAME        FSTYPE FSVER LABEL UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
nvme0n1                                                                           
├─nvme0n1p1 vfat   FAT32       30D7-924F                            1021.7M     0% /efi
├─nvme0n1p2 swap   1           82588610-cf66-4b02-8c15-2d320b1aa906                [SWAP]
└─nvme0n1p3 btrfs              9247e691-df8f-446f-af86-dde6f27713d9  914.8G     3% /var
                                                                                   /usr/local
                                                                                   /tmp
                                                                                   /srv
                                                                                   /home
                                                                                   /opt
                                                                                   /root
                                                                                   /.snapshots
                                                                                   /

fstab:
Code:

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /               btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=256,subvol=/@  0 0

# /dev/nvme0n1p1
UUID=30D7-924F          /efi            vfat            rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro     0 2

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /.snapshots     btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=266,subvol=/@.snapshots        0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /home           btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=263,subvol=/@home      0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /usr/local      btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=260,subvol=/@local     0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /opt            btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=258,subvol=/@opt       0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /root           btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=257,subvol=/@root      0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /srv            btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=259,subvol=/@srv       0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /tmp            btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=262,subvol=/@tmp       0 0

# /dev/nvme0n1p3
UUID=9247e691-df8f-446f-af86-dde6f27713d9       /var            btrfs           rw,relatime,compress=zstd:5,ssd,discard=async,space_cache=v2,subvolid=261,subvol=/@var       0 0

# /dev/nvme0n1p2
UUID=82588610-cf66-4b02-8c15-2d320b1aa906       none            swap            defaults        0 0


Last edited by nurali on Tue Apr 23, 2024 8:08 am; edited 1 time in total
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xgivolari
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Joined: 26 Jul 2021
Posts: 102

PostPosted: Mon Apr 22, 2024 3:03 pm    Post subject: Reply with quote

Do you boot without an initrd, by chance? Looks similar to this:
https://github.com/systemd/systemd/issues/16953

systemd-gpt-auto-generator can mount partitions at the correct mount point based on their type, i.e. without specifying mount points in /etc/fstab or the kernel command line. If you don't need this feature, the commandline parameter systemd.gpt_auto=no should disable these kinds of warnings.
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nurali
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Joined: 17 Nov 2022
Posts: 182
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PostPosted: Mon Apr 22, 2024 3:13 pm    Post subject: Reply with quote

xgivolari wrote:
Do you boot without an initrd, by chance? Looks similar to this:
https://github.com/systemd/systemd/issues/16953

systemd-gpt-auto-generator can mount partitions at the correct mount point based on their type, i.e. without specifying mount points in /etc/fstab or the kernel command line. If you don't need this feature, the commandline parameter systemd.gpt_auto=no should disable these kinds of warnings.

Thanks for replying
Yes,I disabled initrd and loadable kernel modules in the kernel,took me lots of time to simplify the current .config
Thank you again for sharing the issue link,I will check it and decide what to do
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nurali
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Posts: 182
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PostPosted: Tue Apr 23, 2024 8:07 am    Post subject: Reply with quote

xgivolari wrote:
Do you boot without an initrd, by chance? Looks similar to this:
https://github.com/systemd/systemd/issues/16953

systemd-gpt-auto-generator can mount partitions at the correct mount point based on their type, i.e. without specifying mount points in /etc/fstab or the kernel command line. If you don't need this feature, the commandline parameter systemd.gpt_auto=no should disable these kinds of warnings.

Thank you again
Understood after checking that issue,and GRUB_CMDLINE_LINUX_DEFAULT="systemd.gpt_auto=no" did the trick,I think I don't need this feature
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