unregister_netdevice: waiting for lo to become free. Usage count = 7
ref_tracker: netdev@ffff888032b74618 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
     netdev_hold include/linux/netdevice.h:4429 [inline]
     netdev_hold include/linux/netdevice.h:4424 [inline]
     ib_device_set_netdev drivers/infiniband/core/device.c:2253 [inline]
     ib_device_set_netdev+0x2eb/0x860 drivers/infiniband/core/device.c:2222
     rxe_register_device+0x244/0x340 drivers/infiniband/sw/rxe/rxe_verbs.c:1552
     rxe_net_add+0x95/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:586
     rxe_newlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:234
     nldev_newlink+0x3a6/0x680 drivers/infiniband/core/nldev.c:1797
     rdma_nl_rcv_msg+0x38a/0x6e0 drivers/infiniband/core/netlink.c:195
     rdma_nl_rcv_skb.constprop.0.isra.0+0x2d0/0x430 drivers/infiniband/core/netlink.c:239
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg net/socket.c:742 [inline]
     ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
     ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
     __sys_sendmsg+0x16d/0x220 net/socket.c:2678
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f