[Bug 888069] Re: SRU Request for LP: #563895

[nutznboltz]

PPA containing Lucid's grub2 packages plus only this patch:
https://launchpad.net/~nutznboltz/+archive/lucid-grub2-skip-lvm-snapshots

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https://bugs.launchpad.net/bugs/888069

Title:
  SRU Request for LP: #563895

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  SRU Justification:

  Impact: When /boot and / are in an LVM VG and a snapshot is made of an
  LVM LV in that VG the system will not boot and grub can not be
  modified (updated, reinstalled) until all snapshots are removed.

  Testcase:
  Steps to reproduce:

  1. Install Ubuntu from either the "server" or "alternate" ISO image to a system with an otherwise empty boot diskl
  2. Use "manual partitioning" and create a single partition over the entire boot disk with type "Logical Volume Manager"
  3. Configure LVM with a volume group containing the boot disk.
  3A. Create a logical volume for swap.
  3B. Create a logical volume for the root filesystem.
  3C. Leave some free space in the volume group for future snapshots.
  3D. Do not make a separate /boot file system.
  4. Finish installation, reboot, apply patches, reboot.
  5. Use "lvcreate" to make a snapshot of the logical volume containing the root file system.
  6. Reboot.  You will be at the "grub-rescue>" prompt.

  You cannot recover from this by using an ISO in recovery mode until
  you remove the snapshot as grub-probe fails during attempts to re-
  install or update grub2 while a snapshot if fixed.

  Fix:

  Cherry-picked patch from upstream grub2 that only modifies one source
  code file: ... disk/lvm.c inside grub2.

  See attachment for patch.

  See also:
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574863
  LP: #563895

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: grub-pc 1.98-1ubuntu12
  ProcVersionSignature: Ubuntu 2.6.32-35.78-generic 2.6.32.46+drm33.20
  Uname: Linux 2.6.32-35-generic i686
  Architecture: i386
  Date: Wed Nov  9 08:48:59 2011
  InstallationMedia: Ubuntu 10.04.2 LTS "Lucid Lynx" - Release i386 (20110211.1)
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2

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