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    SubjectRe: [dm-devel] can't recover ext4 on lvm from ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd


    On Thu, 5 Jan 2012, Ted Ts'o wrote:

    > On Thu, Jan 05, 2012 at 05:14:28PM +0100, Sander Eikelenboom wrote:
    > >
    > > OK spoke too soon, i have been able to trigger it again:
    > > - copying files from LV to the same LV without the snapshot went OK
    > > - copying from the RO snapshot of a LV to the same LV gave the error while copying the file again:
    >
    > OK. Originally, you said you did this:
    >
    > 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)
    >
    > Was this with with a read-only snapshot always being in existence
    > through all of these five steps? When was the RO snapshot created?
    >
    > If a RO snapshot has to be there in order for this to happen, then
    > this is almost certainly a device-mapper regression. (dm-devel folks,

    The existence of a snapshot changes I/O completion times significantly, so
    it may be a race condition in ext4 that gets triggered which changed
    timings.

    Mikulas

    > this is a problem which apparently occurred when the user went from
    > v3.1.5 to v3.2, so this looks likes 3.2 regression.)
    >
    > - Ted


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