grub on btrfs with compress=lzo fails to boot

I can confirm this on a 32bit Machine. But it isn't harmless, because the System will not boot. I only have the grub rescue shell after the error message.

I have a similar problem.
At the grub2 prompt, I can boot the system using the following commands
set root=(hd0,msdos1)
linux /@/boot/vmlinuz-2.6.38-8-generic root=/dev/sda1 ro rootflags=subvol=@
initrd /@/boot/initrd.img-2.6.38-8-generic
boot

But I get a message saying that it cannot read the Linux header if I try the -9 or -10 kernel.

There's an experimental implementation on the upstream bug, anyone taken a look at it yet?

With this being in trunk now for a while, any chance of getting this into precise?

As an alternative, if you add the z (Not_Compressed) xattr to /boot its contents won't get compressed and grub will continue to work.

please either update grub package, or change the installer set the Not_Compressed xattr to /boot as mentioned by @kylegates

the later is more likely to happen to precise at this late date

This bug was fixed in the package grub2 - 1.99-18ubuntu1

---------------
grub2 (1.99-18ubuntu1) precise; urgency=low

  * Resynchronise with Debian. Remaining changes:
    - Adjust for default Ubuntu boot options ("quiet splash").
    - Default to hiding the menu; holding down Shift at boot will show it.
    - Set a monochromatic theme and an appropriate background for Ubuntu.
    - Apply Ubuntu GRUB Legacy changes to legacy update-grub script.
    - Fix backslash-escaping in merge_debconf_into_conf.
    - Remove "GNU/Linux" from default distributor string.
    - Add crashkernel option.
    - Bypass menu unless other OSes are installed or Shift is pressed.
    - Allow Shift to interrupt 'sleep --interruptible'.
    - Reduce visual clutter in normal mode.
    - Remove verbose messages printed before reading configuration.
    - Suppress kernel/initrd progress messages, except in recovery mode.
    - Show the boot menu if the previous boot failed.
    - Don't generate device.map during grub-install or grub-mkconfig.
    - Adjust upgrade version checks for Ubuntu.
    - Suppress "GRUB loading" message unless Shift is held down.
    - Adjust versions of grub-doc and grub-legacy-doc conflicts.
    - Fix LVM/RAID probing in the absence of /boot/grub/device.map.
    - Look for .mo files in /usr/share/locale-langpack first.
    - Build-depend on qemu-kvm rather than qemu-system for grub-pc tests.
    - Check hardware support before using gfxpayload=keep.
    - Put second and subsequent Linux menu entries in a submenu.
    - Preferred resolution detection for VBE.
    - Set vt.handoff=7 for smooth handoff to kernel graphical mode.
    - Update default/grub.md5sum to include maverick's default md5sum.
    - In recovery mode, add nomodeset to the Linux kernel arguments, and
      remove the 'set gfxpayload=keep' command.
    - Skip Windows os-prober entries on Wubi systems, and suppress the menu
      by default if those are the only other-OS entries.
    - Handle probing striped DM-RAID devices.
    - Replace 'single' by 'recovery' when friendly-recovery is installed.
    - Use qemu -no-kvm in tests for now to work around LP #947597.
    - Disable cursor as early as possible in grub_main.

grub2 (1.99-18) unstable; urgency=low

  [ Colin Watson ]
  * Ensure that /sbin and /usr/sbin are in $PATH when running tests (closes:
    #662916).
  * mkconfig_loopback.patch: Use different GRUB loop devices for different
    OS loop devices (thanks, bcbc; LP: #888281).
  * Backport from upstream:
    - Add support for LZO compression in btrfs (LP: #727535).
    - Fix efiemu configure check.

  [ Ilya Yanok ]
  * Backport from upstream:
    - Make FAT UUID uppercase to match Linux (LP: #948716).

  [ Debconf translations ]
  * Norwegian Bokmål (Hans Fredrik Nordhaug).
  * Gujarati (Kartik Mistry). Closes: #663542
 -- Colin Watson <email address hidden> Mon, 19 Mar 2012 20:00:22 +0000