[20426.749824][ T4642] unregister_netdevice: waiting for br1 to become free. Usage count = 8
[20426.750340][ T4642] ref_tracker: br1@ffff88800a3b25d0 has 4/7 users at
[20426.750340][ T4642]      dst_init+0x84/0x4a0
[20426.750340][ T4642]      dst_alloc+0x97/0x150
[20426.750340][ T4642]      ip6_dst_alloc+0x23/0x90
[20426.750340][ T4642]      ip6_rt_pcpu_alloc+0x1e6/0x520
[20426.750340][ T4642]      ip6_pol_route+0x56f/0x840
[20426.750340][ T4642]      __fib6_rule_action+0x47a/0x5b0
[20426.750340][ T4642]      fib_rules_lookup+0x2b4/0xa20
[20426.750340][ T4642]      fib6_rule_lookup+0x182/0x630
[20426.750340][ T4642]      ip6_route_input+0x59c/0xa50
[20426.750340][ T4642]      ipv6_rcv+0x397/0x810
[20426.750340][ T4642]      __netif_receive_skb_one_core+0x118/0x1b0
[20426.750340][ T4642]      netif_receive_skb_internal+0xb0/0x330
[20426.750340][ T4642]      netif_receive_skb+0x55/0x280
[20426.750340][ T4642]      br_handle_frame_finish+0xbef/0x1ce0 [bridge]
[20426.750340][ T4642]      br_handle_frame+0x612/0xe60 [bridge]
[20426.750340][ T4642]      __netif_receive_skb_core.constprop.0+0x790/0x2e30
[20426.750340][ T4642] 
[20426.752683][ T4642] ref_tracker: br1@ffff88800a3b25d0 has 1/7 users at
[20426.752683][ T4642]      netdev_get_by_index+0x5e/0x80
[20426.752683][ T4642]      fib6_nh_init+0x3d8/0x15b0
[20426.752683][ T4642]      ip6_route_info_create+0xf18/0x17d0
[20426.752683][ T4642]      ip6_route_add+0x1c/0x140
[20426.752683][ T4642]      addrconf_add_mroute+0x1ac/0x2c0
[20426.752683][ T4642]      addrconf_add_dev+0xe2/0x170
[20426.752683][ T4642]      inet6_addr_add+0x12f/0xa40
[20426.752683][ T4642]      inet6_rtm_newaddr+0x560/0x6b0
[20426.752683][ T4642]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20426.752683][ T4642]      netlink_rcv_skb+0x130/0x360
[20426.752683][ T4642]      netlink_unicast+0x449/0x710
[20426.752683][ T4642]      netlink_sendmsg+0x723/0xbe0
[20426.752683][ T4642]      ____sys_sendmsg+0x7b2/0xa10
[20426.752683][ T4642]      ___sys_sendmsg+0xee/0x170
[20426.752683][ T4642]      __sys_sendmsg+0xcd/0x170
[20426.752683][ T4642]      do_syscall_64+0xc6/0x1e0
[20426.752683][ T4642] 
[20426.754880][ T4642] ref_tracker: br1@ffff88800a3b25d0 has 1/7 users at
[20426.754880][ T4642]      ipv6_add_dev+0x3b9/0x11c0
[20426.754880][ T4642]      ipv6_find_idev+0x102/0x170
[20426.754880][ T4642]      inet6_rtm_newaddr+0x37c/0x6b0
[20426.754880][ T4642]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20426.754880][ T4642]      netlink_rcv_skb+0x130/0x360
[20426.754880][ T4642]      netlink_unicast+0x449/0x710
[20426.754880][ T4642]      netlink_sendmsg+0x723/0xbe0
[20426.754880][ T4642]      ____sys_sendmsg+0x7b2/0xa10
[20426.754880][ T4642]      ___sys_sendmsg+0xee/0x170
[20426.754880][ T4642]      __sys_sendmsg+0xcd/0x170
[20426.754880][ T4642]      do_syscall_64+0xc6/0x1e0
[20426.754880][ T4642]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[20426.754880][ T4642] 
[20426.756620][ T4642] ref_tracker: br1@ffff88800a3b25d0 has 1/7 users at
[20426.756620][ T4642]      neigh_parms_alloc+0x1e5/0x510
[20426.756620][ T4642]      ipv6_add_dev+0x2fd/0x11c0
[20426.756620][ T4642]      ipv6_find_idev+0x102/0x170
[20426.756620][ T4642]      inet6_rtm_newaddr+0x37c/0x6b0
[20426.756620][ T4642]      rtnetlink_rcv_msg+0x2fb/0xbf0
[20426.756620][ T4642]      netlink_rcv_skb+0x130/0x360
[20426.756620][ T4642]      netlink_unicast+0x449/0x710
[20426.756620][ T4642]      netlink_sendmsg+0x723/0xbe0
[20426.756620][ T4642]      ____sys_sendmsg+0x7b2/0xa10
[20426.756620][ T4642]      ___sys_sendmsg+0xee/0x170
[20426.756620][ T4642]      __sys_sendmsg+0xcd/0x170
[20426.756620][ T4642]      do_syscall_64+0xc6/0x1e0
[20426.756620][ T4642]      entry_SYSCALL_64_after_hwframe+0x6d/0x75
[20426.756620][ T4642]