unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: lo@ffff88804f2b6610 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4331 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4343 [inline]
     netdev_get_by_index+0x7c/0xb0 net/core/dev.c:1006
     fib6_nh_init+0x791/0x1fb0 net/ipv6/route.c:3583
     nh_create_ipv6 net/ipv4/nexthop.c:2851 [inline]
     nexthop_create net/ipv4/nexthop.c:2902 [inline]
     nexthop_add net/ipv4/nexthop.c:2939 [inline]
     rtm_new_nexthop+0x2445/0x84c0 net/ipv4/nexthop.c:3254
     rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6955
     netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534
     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