[Bug 1678112] [NEW] grub fails on lvmcached raid1 volume

Julian Taylor jtaylor.debian at googlemail.com
Fri Mar 31 12:35:35 UTC 2017 

Public bug reported:

grub fails to work when araid1 lvm volume exists that is cached in zesty.
grub version 2.02~beta3-4ubuntu1
The same configuration worked on yakkety

~$ sudo update-grub2
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.10.0-14-generic
Found initrd image: /boot/initrd.img-4.10.0-14-generic
Found linux image: /boot/vmlinuz-4.8.0-45-generic
Found initrd image: /boot/initrd.img-4.8.0-45-generic
Found memtest86+ image: /memtest86+.elf
Found memtest86+ image: /memtest86+.bin
Found Windows 7 on /dev/sdc4
Found Debian GNU/Linux wheezy/sid on /dev/mapper/lvm-debian
Found Ubuntu 15.04 (15.04) on /dev/mapper/lvm-root2
Found Ubuntu 14.04.1 LTS (14.04) on /dev/mapper/lvm-root3

$ sudo lvcreate --type raid1 -L 1G lvm -n testing
  Logical volume "testing" created.
~$ sudo lvcreate --type cache --cachemode writeback -L 10G -n ssdcachetest lvm/testing /dev/sda1
  Using default stripesize 64.00 KiB.
  WARNING: Data redundancy is lost with writeback caching of raid logical volume!
  Logical volume lvm/testing is now cached.

~$ sudo update-grub2
Generating grub configuration file ...
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
error: invalid segment.
grub-probe: error: disk `lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26' not found.

removing the cache fixes the issue.

lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26 is my boot lvm partition which is a regular uncached linear partition.
  --- Logical volume ---
  LV Path                /dev/lvm/boot
  LV Name                boot
  VG Name                lvm
  LV UUID                7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26
  LV Write Access        read/write
  LV Creation host, time ubuntu, 2015-09-27 23:22:37 +0200
  LV Status              available
  # open                 1
  LV Size                1.00 GiB
  Current LE             256
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- grub fails to work when araid1 lvm volume exists that is cached.
+ grub fails to work when araid1 lvm volume exists that is cached in zesty.
+ grub version 2.02~beta3-4ubuntu1
+ The same configuration worked on yakkety
  
  ~$ sudo update-grub2
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.10.0-14-generic
  Found initrd image: /boot/initrd.img-4.10.0-14-generic
  Found linux image: /boot/vmlinuz-4.8.0-45-generic
  Found initrd image: /boot/initrd.img-4.8.0-45-generic
  Found memtest86+ image: /memtest86+.elf
  Found memtest86+ image: /memtest86+.bin
  Found Windows 7 on /dev/sdc4
  Found Debian GNU/Linux wheezy/sid on /dev/mapper/lvm-debian
  Found Ubuntu 15.04 (15.04) on /dev/mapper/lvm-root2
  Found Ubuntu 14.04.1 LTS (14.04) on /dev/mapper/lvm-root3
  
- 
  $ sudo lvcreate --type raid1 -L 1G lvm -n testing
-   Logical volume "testing" created.
+   Logical volume "testing" created.
  ~$ sudo lvcreate --type cache --cachemode writeback -L 10G -n ssdcachetest lvm/testing /dev/sda1
-   Using default stripesize 64.00 KiB.
-   WARNING: Data redundancy is lost with writeback caching of raid logical volume!
-   Logical volume lvm/testing is now cached.
+   Using default stripesize 64.00 KiB.
+   WARNING: Data redundancy is lost with writeback caching of raid logical volume!
+   Logical volume lvm/testing is now cached.
  
  ~$ sudo update-grub2
  Generating grub configuration file ...
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  grub-probe: error: disk `lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26' not found.
  
- 
  removing the cache fixes the issue.
  
- 
  lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26 is my boot lvm partition which is a regular uncached linear partition.
-   --- Logical volume ---
-   LV Path                /dev/lvm/boot
-   LV Name                boot
-   VG Name                lvm
-   LV UUID                7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26
-   LV Write Access        read/write
-   LV Creation host, time ubuntu, 2015-09-27 23:22:37 +0200
-   LV Status              available
-   # open                 1
-   LV Size                1.00 GiB
-   Current LE             256
-   Segments               1
-   Allocation             inherit
-   Read ahead sectors     auto
-   - currently set to     256
-   Block device           253:2
+   --- Logical volume ---
+   LV Path                /dev/lvm/boot
+   LV Name                boot
+   VG Name                lvm
+   LV UUID                7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26
+   LV Write Access        read/write
+   LV Creation host, time ubuntu, 2015-09-27 23:22:37 +0200
+   LV Status              available
+   # open                 1
+   LV Size                1.00 GiB
+   Current LE             256
+   Segments               1
+   Allocation             inherit
+   Read ahead sectors     auto
+   - currently set to     256
+   Block device           253:2

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https://bugs.launchpad.net/bugs/1678112

Title:
  grub fails on lvmcached raid1 volume

Status in grub-installer package in Ubuntu:
  New

Bug description:
  grub fails to work when araid1 lvm volume exists that is cached in zesty.
  grub version 2.02~beta3-4ubuntu1
  The same configuration worked on yakkety

  ~$ sudo update-grub2
  Generating grub configuration file ...
  Found linux image: /boot/vmlinuz-4.10.0-14-generic
  Found initrd image: /boot/initrd.img-4.10.0-14-generic
  Found linux image: /boot/vmlinuz-4.8.0-45-generic
  Found initrd image: /boot/initrd.img-4.8.0-45-generic
  Found memtest86+ image: /memtest86+.elf
  Found memtest86+ image: /memtest86+.bin
  Found Windows 7 on /dev/sdc4
  Found Debian GNU/Linux wheezy/sid on /dev/mapper/lvm-debian
  Found Ubuntu 15.04 (15.04) on /dev/mapper/lvm-root2
  Found Ubuntu 14.04.1 LTS (14.04) on /dev/mapper/lvm-root3

  $ sudo lvcreate --type raid1 -L 1G lvm -n testing
    Logical volume "testing" created.
  ~$ sudo lvcreate --type cache --cachemode writeback -L 10G -n ssdcachetest lvm/testing /dev/sda1
    Using default stripesize 64.00 KiB.
    WARNING: Data redundancy is lost with writeback caching of raid logical volume!
    Logical volume lvm/testing is now cached.

  ~$ sudo update-grub2
  Generating grub configuration file ...
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  error: invalid segment.
  grub-probe: error: disk `lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26' not found.

  removing the cache fixes the issue.

  lvmid/OwVp3J-KH9N-RcXl-Fh3J-ZEiZ-egg4-JRffI3/7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26 is my boot lvm partition which is a regular uncached linear partition.
    --- Logical volume ---
    LV Path                /dev/lvm/boot
    LV Name                boot
    VG Name                lvm
    LV UUID                7Dieap-dj1i-dHiz-eLfa-c7be-IiyB-GaHL26
    LV Write Access        read/write
    LV Creation host, time ubuntu, 2015-09-27 23:22:37 +0200
    LV Status              available
    # open                 1
    LV Size                1.00 GiB
    Current LE             256
    Segments               1
    Allocation             inherit
    Read ahead sectors     auto
    - currently set to     256
    Block device           253:2

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