unregister_netdevice: waiting for lo to become free. Usage count = 3
ref_tracker: lo@ffff88805d60c610 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4331 [inline]
     netdev_hold include/linux/netdevice.h:4360 [inline]
     netdev_hold include/linux/netdevice.h:4355 [inline]
     ib_device_set_netdev drivers/infiniband/core/device.c:2216 [inline]
     ib_device_set_netdev+0x2eb/0x860 drivers/infiniband/core/device.c:2185
     siw_device_create drivers/infiniband/sw/siw/siw_main.c:320 [inline]
     siw_newlink drivers/infiniband/sw/siw/siw_main.c:426 [inline]
     siw_newlink+0x476/0xd70 drivers/infiniband/sw/siw/siw_main.c:412
     nldev_newlink+0x3a6/0x680 drivers/infiniband/core/nldev.c:1796
     rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195
     rdma_nl_rcv_skb.constprop.0.isra.0+0x2e5/0x450 drivers/infiniband/core/netlink.c:239
     netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
     netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339
     netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
     sock_sendmsg_nosec net/socket.c:712 [inline]
     __sock_sendmsg net/socket.c:727 [inline]
     ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566
     ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
     __sys_sendmsg+0x16d/0x220 net/socket.c:2652
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f