BUG: memory leak
unreferenced object 0xffff88810620f900 (size 128):
  comm "kworker/u4:1", pid 26, jiffies 4294937697 (age 1634.440s)
  hex dump (first 32 bytes):
    c0 d8 ca 85 ff ff ff ff 50 cb c5 05 81 88 ff ff  ........P.......
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8234b75c>] kmalloc include/linux/slab.h:600 [inline]
    [<ffffffff8234b75c>] kzalloc include/linux/slab.h:733 [inline]
    [<ffffffff8234b75c>] blk_iolatency_init+0x2c/0x250 block/blk-iolatency.c:765
    [<ffffffff82341e3b>] blkcg_init_queue+0x11b/0x1f0 block/blk-cgroup.c:1302
    [<ffffffff8232d610>] __alloc_disk_node+0x130/0x240 block/genhd.c:1366
    [<ffffffff82323989>] __blk_mq_alloc_disk+0x99/0xf0 block/blk-mq.c:3961
    [<ffffffff827bd11f>] floppy_alloc_disk+0x2f/0x130 drivers/block/floppy.c:4514
    [<ffffffff86fcef65>] do_floppy_init drivers/block/floppy.c:4595 [inline]
    [<ffffffff86fcef65>] floppy_async_init+0x10f/0x1399 drivers/block/floppy.c:4765
    [<ffffffff8128c894>] async_run_entry_fn+0x24/0xf0 kernel/async.c:127
    [<ffffffff81279dbf>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2289
    [<ffffffff8127a6e9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436
    [<ffffffff812843e5>] kthread+0x125/0x160 kernel/kthread.c:376
    [<ffffffff8100225f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306