On Mon, May 11, 2015 at 07:04:24PM -0400, John Snow wrote:
> @@ -1825,6 +1827,19 @@ static void drive_backup_prepare(BlkActionState
> *common, Error **errp)
> }
> bs = blk_bs(blk);
>
> + /* BackupBlockJob is opaque to us, so look up the bitmap ourselves */
> + if (backup->has_bitmap) {
> + bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);This usage of bs needs to be inside aio_context_acquire().
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