Public bug reported:
On LVM systems where an LV is fronted by a dm-writecache LV grub-probe
fails to identify the filesystem type:
root@sunny:~# grub-probe -d /dev/mapper/SUNNY-usr_local -t fs
error: invalid segment.
error: invalid segment.
grub-probe: error: disk
`lvmid/9jfMwj-Zq6X-U8VT-Dt7o-8NQO-CZnP-8SIDgx/H8qr1q-N9se-U1iU-2HpR-zgIR-BiEw-bOBwAM'
not found.
root@sunny:~# file -sL /dev/mapper/SUNNY-usr_local
/dev/mapper/SUNNY-usr_local: Linux rev 1.0 ext4 filesystem data,
UUID=63874235-ad0b-4e60-8638-4121e5d5664a, volume name "usr_local" (extents)
(64bit) (large files) (huge files)
The error reports percolate up to "update-grub" / "grub-mkconfig" giving
the impression there's something very wrong and reboot might fail.
In this case though grub-probe is being triggered by os-prober (via
/etc/grub.d/30_os-prober and /usr/lib/os-probes/50mounted-tests
/dev/mapper/SUNNY-usr_local)
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1947336
Title:
grub-probe: info: unknown LVM type writecache
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