[Bug 1947336] [NEW] grub-probe: info: unknown LVM type writecache

[TJ]

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 at 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 at 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

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/1947336

Title:
  grub-probe: info: unknown LVM type writecache

Status in grub2 package in Ubuntu:
  New

Bug description:
  On LVM systems where an LV is fronted by a dm-writecache LV grub-probe
  fails to identify the filesystem type:

  root at 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 at 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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1947336/+subscriptions