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

[Erik Stian Tefre]

Reproduced both on physical hardware and in virtualbox on 12.04.2 LTS.
The physical hardware reboots/resets after the grub menu. The virtual
machine triggers a guru meditation in virtualbox instead of the
reboot/reset.

The workaround in the bug description works as advertised.

My (limited) testing of the issue indicates that drive 0 has to be yanked to reproduce the bug. Yanking drive 1 has no effect on bootability.
[_U] : Doesn't boot.
[U_] : Boots.

The system boots just fine if the degraded drive is connected to the
system at boot time. It has to be yanked (or broken for real) to trigger
the bug.

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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

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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