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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Louis Bouchard (louis-bouchard):

[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

** Affects: grub2 (Ubuntu)
     Importance: Medium
     Assignee: Louis Bouchard (louis-bouchard)
         Status: Invalid

** Affects: grub2 (Ubuntu Precise)
     Importance: Medium
     Assignee: Louis Bouchard (louis-bouchard)
         Status: In Progress

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grub-pc fails to boot (system resets after GRUB prompt) on degraded RAID
https://bugs.launchpad.net/bugs/1073108
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