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    Subjectcan't recover ext4 on lvm from ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd

    I'm having some troubles with a ext4 filesystem on LVM, it seems bricked and fsck doesn't seem to find and correct the problem.

    Steps:
    1) fsck -v -p -f the filesystem
    2) mount the filesystem
    3) Try to copy a file
    4) filesystem will be mounted RO on error (see below)
    5) fsck again, journal will be recovered, no other errors
    6) start at 1)


    I think the way i bricked it is:
    - make a lvm snapshot from that lvm logical disk
    - mount that lvm snapshot as RO
    - try to copy a file from that mounted RO snapshot to a diffrent dir on the lvm logical disk the snapshot is from.
    - it fails and i can't recover (see above)


    Is there a way to recover from this ?



    [ 220.748928] EXT4-fs error (device dm-2): ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd
    [ 220.749415] Aborting journal on device dm-2-8.
    [ 220.771633] EXT4-fs error (device dm-2): ext4_journal_start_sb:327: Detected aborted journal
    [ 220.772593] EXT4-fs (dm-2): Remounting filesystem read-only
    [ 220.792455] EXT4-fs (dm-2): Remounting filesystem read-only
    [ 220.805118] EXT4-fs (dm-2): ext4_da_writepages: jbd2_start: 9680 pages, ino 4079617; err -30
    serveerstertje:/mnt/xen_images/domains/production# cd /
    serveerstertje:/# umount /mnt/xen_images/
    serveerstertje:/# fsck -f -v -p /dev/serveerstertje/xen_images
    fsck from util-linux-ng 2.17.2
    /dev/mapper/serveerstertje-xen_images: recovering journal

    277 inodes used (0.00%)
    5 non-contiguous files (1.8%)
    0 non-contiguous directories (0.0%)
    # of inodes with ind/dind/tind blocks: 41/41/3
    Extent depth histogram: 69/28/2
    51890920 blocks used (79.18%)
    0 bad blocks
    41 large files

    199 regular files
    53 directories
    0 character device files
    0 block device files
    0 fifos
    0 links
    16 symbolic links (16 fast symbolic links)
    0 sockets
    --------
    268 files
    serveerstertje:/#




    System:
    - Kernel 3.2.0
    - Debian Squeeze with:
    ii e2fslibs 1.41.12-4stable1 ext2/ext3/ext4 file system libraries
    ii e2fsprogs 1.41.12-4stable1 ext2/ext3/ext4 file system utilities



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