BUG: memory leak
unreferenced object 0xffff888102450200 (size 128):
  comm "kworker/u4:0", pid 8, jiffies 4294937725 (age 251.960s)
  hex dump (first 32 bytes):
    e0 10 eb 85 ff ff ff ff d0 6b 3d 06 81 88 ff ff  .........k=.....
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8235891c>] kmalloc include/linux/slab.h:600 [inline]
    [<ffffffff8235891c>] kzalloc include/linux/slab.h:733 [inline]
    [<ffffffff8235891c>] blk_iolatency_init+0x2c/0x250 block/blk-iolatency.c:765
    [<ffffffff8234ee8b>] blkcg_init_queue+0x11b/0x1f0 block/blk-cgroup.c:1302
    [<ffffffff8233a530>] __alloc_disk_node+0x130/0x240 block/genhd.c:1367
    [<ffffffff82330359>] __blk_mq_alloc_disk+0x99/0xf0 block/blk-mq.c:3942
    [<ffffffff827cdccf>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4514
    [<ffffffff871f699f>] do_floppy_init drivers/block/floppy.c:4595 [inline]
    [<ffffffff871f699f>] floppy_async_init+0x10f/0x1399 drivers/block/floppy.c:4765
    [<ffffffff81284f04>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
    [<ffffffff812726aa>] process_one_work+0x2ba/0x5f0 kernel/workqueue.c:2289
    [<ffffffff81272fc9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436
    [<ffffffff8127ca45>] kthread+0x125/0x160 kernel/kthread.c:376
    [<ffffffff8100224f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306