[bug #60885] grub-probe spews "invalid segment" errors when applied to disk containing moved LVM PV

[Zack Weinberg]

URL:
  <https://savannah.gnu.org/bugs/?60885>

                 Summary: grub-probe spews "invalid segment" errors when
applied to disk containing moved LVM PV
                 Project: GNU GRUB
            Submitted by: zackw
            Submitted on: Tue 06 Jul 2021 12:41:21 PM UTC
                Category: Disk &amp; Partition
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: other
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None

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Details:

My boot drive is GPT-labeled and has three partitions:


# sfdisk -l -o+Name /dev/nvme0n1
Disk /dev/nvme0n1: 953.87 GiB, 1024209543168 bytes, 2000409264 sectors
Disk model: ADATA SX8200PNP                         
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 936825C1-D957-42A9-899C-32FFDC4FF40E

Device           Start        End    Sectors   Size Type             Name
/dev/nvme0n1p1    2048     788479     786432   384M EFI System       EFISYS
/dev/nvme0n1p2  788480    4196351    3407872   1.6G Linux filesystem boot
/dev/nvme0n1p3 4196352 2000408575 1996212224 951.9G Linux LVM        


Recently I needed to enlarge the 'boot' partition (kernels keep getting
bigger), which meant shrinking the LVM physical volume and then shifting it to
higher sectors (using gparted).

Ever since I did that, most any use of `grub-probe` on a partition of this
disk prints "error: invalid segment" at least three times.  For example:


# grub-probe --version
grub-probe (GRUB) 2.04-19

# grub-probe -d /dev/nvme0n1 -t drive
(hd0)

# grub-probe -d /dev/nvme0n1p1 -t drive
error: invalid segment.
error: invalid segment.
error: invalid segment.
(hd0,gpt1)


It seems to work anyway, but I'm concerned that this might be the only warning
I get about some kind of latent disk corruption.

Output of `grub-probe -d /dev/nvme0n1p3 -t drive -v` is attached.  The key
excerpt seems to be


grub-probe: info: Scanning for lvm devices on disk hd0.
grub-probe: info: unknown LVM type cache.
grub-probe: info: unknown LVM type cache-pool+METADATA_FORMAT.
grub-probe: info: Found array moxana_vg.
error: invalid segment.





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File Attachments:


-------------------------------------------------------
Date: Tue 06 Jul 2021 12:41:21 PM UTC  Name: grub-probe-verbose.txt  Size:
9KiB   By: zackw

<http://savannah.gnu.org/bugs/download.php?file_id=51652>

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