unregister_netdevice: waiting for bridge_slAve_0 to become free. Usage count = 2
ref_tracker: lo@ffff888061318620 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_hold include/linux/netdevice.h:4091 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1238 [inline]
     fib_check_nh+0xd17/0x1bd0 net/ipv4/fib_semantics.c:1258
     nh_create_ipv4 net/ipv4/nexthop.c:2808 [inline]
     nexthop_create net/ipv4/nexthop.c:2889 [inline]
     nexthop_add net/ipv4/nexthop.c:2934 [inline]
     rtm_new_nexthop+0x5234/0xa540 net/ipv4/nexthop.c:3220
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2536
     netlink_unicast_kernel net/netlink/af_netlink.c:1316 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1342
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1886
     sock_sendmsg_nosec net/socket.c:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744
     ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2607
     ___sys_sendmsg net/socket.c:2661 [inline]
     __sys_sendmmsg+0x3ab/0x730 net/socket.c:2747
     __do_sys_sendmmsg net/socket.c:2776 [inline]
     __se_sys_sendmmsg net/socket.c:2773 [inline]
     __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2773
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f