bugGNU GRUB - Bugs: bug #37157, fails to boot on systems with LVM...


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bug #37157: fails to boot on systems with LVM snapshots

Submitted by:  Brian J. Murrell <brian_j_murrell>
Submitted on:  Tue 21 Aug 2012 01:15:18 PM UTC  
Category:  Booting Severity:  Major
Priority:  5 - Normal Item Group:  Software Error
Status:  Fixed Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Closed Release: 
Release:  other Reproducibility:  Every Time
Planned Release:  None

Wed 09 Jan 2013 10:07:02 PM UTC, comment #1:

1.99 is old and this problem was corrected in newer versions.

Vladimir Serbinenko <phcoder>
Project Administrator
Tue 21 Aug 2012 01:15:18 PM UTC, original submission:

Using grub 1.99[-12ubuntu5-1linuxmint1] on Ubuntu/Mint:

On a machine which boots from an LVM origin that has snapshots, the "search" directive causes boot to fail due to internal LVM device mappings with the same UUIDs.

First, the grub entry:

menuentry 'Linux Mint 12 Fluxbox, 3.2.0-29-generic-pae (/dev/mapper/rootvol-ubuntu_root)' --class linuxmint --class gnu-linux --class gnu --class os {
set gfxpayload=$linux_gfx_mode
insmod gzio
insmod lvm
insmod part_msdos
insmod ext2
set root='(rootvol-ubuntu_root)'
search --no-floppy --fs-uuid --set=root 7df7bb45-c3ff-47c1-8df6-744e54e4d7b5
linux /boot/vmlinuz-3.2.0-29-generic-pae root=/dev/mapper/rootvol-ubuntu_root ro console=ttyS0,115200 console=tty0 crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
initrd /boot/initrd.img-3.2.0-29-generic-pae

and now, blkid output for the matching UUIDs:

$ blkid | grep 7df7bb45-c3ff-47c1-8df6-744e54e4d7b5
/dev/mapper/rootvol-ubuntu_root-real: UUID="7df7bb45-c3ff-47c1-8df6-744e54e4d7b5" TYPE="ext3"
/dev/mapper/rootvol-ubuntu_root: UUID="7df7bb45-c3ff-47c1-8df6-744e54e4d7b5" TYPE="ext3"

/dev/mapper/rootvol-ubuntu_root is an origin for an LVM snapshot. The UUID of the filesystem in the snapshot has aleady been changed:

$ sudo lvs | grep ubuntu_root
natty_root rootvol swi-a- 844.00m ubuntu_root 71.67
oneiric_root rootvol swi-a- 644.00m ubuntu_root 86.10
ubuntu_root rootvol owi-ao 644.00m

$ blkid | grep -e natty_root -e oneiric_root
/dev/mapper/rootvol-natty_root-cow: TYPE="DM_snapshot_cow"
/dev/mapper/rootvol-natty_root: UUID="a5fde26c-1a1b-4916-a578-81315bfda1cf" SEC_TYPE="ext2" TYPE="ext3"
/dev/mapper/rootvol-oneiric_root-cow: TYPE="DM_snapshot_cow"
/dev/mapper/rootvol-oneiric_root: UUID="88ceaa00-597b-4bbb-9680-ece1e6f841d2" SEC_TYPE="ext2" TYPE="ext3"

When I try to boot this grub entry, I get an error about the kernel not being found. If I simply remove the "search ... --set=root ..." entry from the stanza, the boot proceeds successfully.

Brian J. Murrell <brian_j_murrell>


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2013-01-09 phcoder StatusNone => Fixed
        Open/ClosedOpen => Closed

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