[Bug 1058129] Re: grub-install seg faults on partitionable raid1

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: grub-installer (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1058129

Title:
  grub-install seg faults on partitionable raid1

Status in “grub-installer” package in Ubuntu:
  Confirmed

Bug description:
  I am trying to install Ubuntu 12.04 amd64 automatically on a
  partitionable software RAID1 using the debian-installer and
  preseeding. The relevant preseeding settings are:

  d-i partman/early_command string /bin/dd if=/dev/zero of=/dev/sda bs=512 count=1 && \
    /bin/dd if=/dev/zero of=/dev/sdb bs=512 count=1 && \
    /sbin/mdadm --create /dev/md0 --metadata=1.0 --auto=mdp \
    --raid-devices=2 --level=1 --bitmap=internal --homehost=xyz /dev/sd[ab]

  d-i partman-auto/disk string /dev/md0

  d-i grub-installer/only_debian boolean true
  d-i grub-installer/with_other_os boolean true

  Everything works smoothly until the grub installation step is reached.
  With these preseeding settings, d-i is supposed to install the boot
  loader into the MBR. Due to unknown reasons (a bug?), it tries to
  install grub to /dev/md0p1, i. e. the first partition on the RAID
  array. Moreover this attempt results in a grub-install segmentation
  fault. Even if I run

  chroot /target grub-install /dev/md0

  manually on a console, grub-install seg faults. If instead I run

  chroot /target update-grub
  chroot /target grub-install /dev/sda
  chroot /target grub-install /dev/sdb

  on a console, I get a bootable system on a partitionable raid (as
  desired).

  In principle this workaround would probably be automisable by making
  use of

  d-i grub-installer/bootdev  string (hd0) (hd1)

  but due to bug #1012629 (https://bugs.launchpad.net/ubuntu/+source
  /debian-installer/+bug/1012629) this does not work, either. :-(

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