[bug #37157] fails to boot on systems with LVM snapshots

[Brian J. Murrell]

URL:
  <http://savannah.gnu.org/bugs/?37157>

                 Summary: fails to boot on systems with LVM snapshots
                 Project: GNU GRUB
            Submitted by: brian_j_murrell
            Submitted on: Tue 21 Aug 2012 01:15:18 PM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: other
         Reproducibility: Every Time
         Planned Release: None

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Details:

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 {
        recordfail
        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.




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