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

Louis Bouchard louis.bouchard at canonical.com
Wed Sep 17 08:55:04 UTC 2014


** Changed in: grub2 (Ubuntu)
   Importance: Undecided => Medium

** Changed in: grub2 (Ubuntu)
     Assignee: (unassigned) => Louis Bouchard (louis-bouchard)

** Also affects: grub2 (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Changed in: grub2 (Ubuntu Precise)
   Importance: Undecided => Medium

** Changed in: grub2 (Ubuntu Precise)
     Assignee: (unassigned) => Louis Bouchard (louis-bouchard)

** Changed in: grub2 (Ubuntu Precise)
       Status: New => In Progress

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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:
  Confirmed
Status in “grub2” source package in Precise:
  In Progress

Bug description:
  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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