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

[Colin Watson]

Makes sense, thanks!

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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:
  In Progress

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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