[Bug 1073108] Re: grub-pc fails to boot (system resets after GRUB prompt) on degraded RAID

[T. K.]

Last week I did a dist-upgrade on by Ubuntu 12.04 system (HP Microserver
N54L,  configured as RAID 1). It seems that this fix results in another
bug or problem at least for me. At the end of the upgrade process a new
grub.cfg is build with the following errors displayed:

...
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.2.0-69-generic
Found initrd image: /boot/initrd.img-3.2.0-69-generic
Found linux image: /boot/vmlinuz-3.2.0-67-generic
Found initrd image: /boot/initrd.img-3.2.0-67-generic
Found memtest86+ image: /memtest86+.bin
ERROR: ddf1: seeking device "/dev/dm-2" to 18446744073709421056
ERROR: hpt37x: seeking device "/dev/dm-2" to 4608
ERROR: hpt45x: seeking device "/dev/dm-2" to 18446744073709547008
ERROR: isw: seeking device "/dev/dm-2" to 18446744073708469760
ERROR: sil: seeking device "/dev/dm-2" to 18446744073709289984
ERROR: ddf1: seeking device "/dev/dm-2" to 18446744073709421056
ERROR: hpt37x: seeking device "/dev/dm-2" to 4608
ERROR: hpt45x: seeking device "/dev/dm-2" to 18446744073709547008
ERROR: isw: seeking device "/dev/dm-2" to 18446744073708469760
ERROR: sil: seeking device "/dev/dm-2" to 18446744073709289984
done
Trigger für libc-bin werden verarbeitet ...
ldconfig deferred processing now taking place

Now I fear that rebooting my system can fail.

Attached you find a file with more information about the update, dist-upgrade, dpkg.log, syslog and lvm configuration.
Please ask for more information if needed . Thank you.

** Attachment added: "Ubuntu Grub Problem.txt"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1073108/+attachment/4223466/+files/Ubuntu%20Grub%20Problem.txt

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https://bugs.launchpad.net/bugs/1073108

Title:
  grub-pc fails to boot (system resets after GRUB prompt) on degraded
  RAID

Status in “grub2” package in Ubuntu:
  Invalid
Status in “grub2” source package in Precise:
  Fix Released

Bug description:
  [SRU justification]
  System does not boot in degraded mode on second disk. This is systematic when system is localized in french (fr_FR.UTF-8)

  [Impact]
  Unable to boot system in degraded mode

  [Fix]
  Backport uptream fix :
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626853

  [Test Case]
  - Install system with system disk as RAID1 with french localization.
  - Remove first disk (/dev/sda) from the system
  - Boot the system.

  Without the patch, grub will loop forever and the system will not boot.
  With the patch, the system boots normally.

  [Regression]
  None expected. This fix is already in present in Debian Wheezy, Ubuntu Trusty and Utopic.

  [Description of the problem]

  When a RAID1 system is degraded (e.g. unplug /dev/sdb, leaving obnly
  /dev/sda), grub-pc properly enters prompt but system is reset as soon
  as one attemps to boot OR one enters the command-line and issue the
  'ls' command.

  This bug is known (and presumably fixed) to Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626853
  Shortly put: adding the 'GRUB_TERMINAL=console' to '/etc/default/grub' (and executing 'update-grub' afterwards) allows to circumvent the issue (verified on Ubuntu/Quantal 12.10).

  I believe this bug is critical because it shows up only when a disk
  fails but remains latent on a healthy system.

  Cheers

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