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    SubjectRe: btrfs io errors on 3.4rc1
    On Tue, Apr 03, 2012 at 06:33:43PM +0200, David Sterba wrote:
    > On Tue, Apr 03, 2012 at 12:20:23PM -0400, Dave Jones wrote:
    > > I see a lot of these ..
    > >
    > > btrfs: __btrfs_end_transaction -EIO abored=1802201963 (no super error)
    >
    > 1802201963 == 0x6b6b6b6b
    >
    > #define POISON_FREE 0x6b /* for use-after-free poisoning */
    >
    > hmm

    wait, what...

    535 memset(trans, 0, sizeof(*trans));
    536 kmem_cache_free(btrfs_trans_handle_cachep, trans);
    537
    538 if (throttle)
    539 btrfs_run_delayed_iputs(root);
    540
    541 if (trans->aborted ||
    542 root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
    543 return -EIO;
    544 }

    that looks like a pretty clear use-after-free.

    Dave



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