BUG: memory leak
unreferenced object 0xffff88811f77c800 (size 512):
  comm "kworker/u4:5", pid 914, jiffies 4294941631 (age 7.780s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 08 c8 77 1f 81 88 ff ff  ..........w.....
    08 c8 77 1f 81 88 ff ff 18 c8 77 1f 81 88 ff ff  ..w.......w.....
  backtrace:
    [<00000000d7024644>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000d7024644>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000d7024644>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000d7024644>] __do_kmalloc mm/slab.c:3653 [inline]
    [<00000000d7024644>] __kmalloc+0x169/0x300 mm/slab.c:3664
    [<00000000ea07a7bb>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000ea07a7bb>] kzalloc include/linux/slab.h:686 [inline]
    [<00000000ea07a7bb>] rds_message_alloc+0x3e/0xc0 net/rds/message.c:291
    [<0000000014dd45d0>] rds_send_probe.constprop.0+0x42/0x380 net/rds/send.c:1431
    [<000000001b166ca6>] rds_send_pong+0x1e/0x23 net/rds/send.c:1494
    [<000000005b3c8fa4>] rds_recv_incoming+0x46c/0x570 net/rds/recv.c:343
    [<0000000001d5eeca>] rds_loop_xmit+0x86/0x100 net/rds/loop.c:96
    [<000000008a04156b>] rds_send_xmit+0x5a9/0xb40 net/rds/send.c:367
    [<00000000bff753a7>] rds_send_worker+0x3c/0x150 net/rds/threads.c:200
    [<00000000f4268a02>] process_one_work+0x227/0x4b0 kernel/workqueue.c:2269
    [<000000005868de3c>] worker_thread+0x56/0x4c0 kernel/workqueue.c:2415
    [<00000000b30cd19b>] kthread+0x13e/0x160 kernel/kthread.c:255
    [<00000000e6d700ef>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352