unregister_netdevice: waiting for vcan0 to become free. Usage count = 2
balance for vcan0@dst_entry is unknown
Call trace for vcan0[1] +2 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     rx_queue_add_kobject net/core/net-sysfs.c:1242 [inline]
     net_rx_queue_update_kobjects+0x148/0x750 net/core/net-sysfs.c:1307
     register_queue_kobjects net/core/net-sysfs.c:2099 [inline]
     netdev_register_kobject+0x21f/0x310 net/core/net-sysfs.c:2347
     register_netdevice+0x14b6/0x1f10 net/core/dev.c:11421
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[2] +2 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     netdev_queue_add_kobject net/core/net-sysfs.c:1979 [inline]
     netdev_queue_update_kobjects+0x16d/0x6c0 net/core/net-sysfs.c:2041
     register_queue_kobjects net/core/net-sysfs.c:2104 [inline]
     netdev_register_kobject+0x258/0x310 net/core/net-sysfs.c:2347
     register_netdevice+0x14b6/0x1f10 net/core/dev.c:11421
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[3] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold+0x27/0xc0 include/linux/netdevice.h:4513
     register_netdevice+0x17b3/0x1f10 net/core/dev.c:11445
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[4] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     neigh_parms_alloc+0x192/0x550 net/core/neighbour.c:1778
     inetdev_init+0x118/0x4f0 net/ipv4/devinet.c:280
     inetdev_event+0x30d/0x1610 net/ipv4/devinet.c:1590
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     register_netdevice+0x1919/0x1f10 net/core/dev.c:11459
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[5] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     inetdev_init+0x19f/0x4f0 net/ipv4/devinet.c:286
     inetdev_event+0x30d/0x1610 net/ipv4/devinet.c:1590
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     register_netdevice+0x1919/0x1f10 net/core/dev.c:11459
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[6] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     neigh_parms_alloc+0x192/0x550 net/core/neighbour.c:1778
     ipv6_add_dev+0x44b/0x1410 net/ipv6/addrconf.c:403
     addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3662
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     register_netdevice+0x1919/0x1f10 net/core/dev.c:11459
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[7] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     ipv6_add_dev+0x4ec/0x1410 net/ipv6/addrconf.c:411
     addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3662
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     register_netdevice+0x1919/0x1f10 net/core/dev.c:11459
     rtnl_newlink_create+0x338/0xb70 net/core/rtnetlink.c:3866
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[8] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     fib_create_info+0x229d/0x31f0 net/ipv4/fib_semantics.c:1491
     fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134
     fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1156
     fib_inetaddr_event+0x12e/0x190 net/ipv4/fib_frontend.c:1470
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380
     __inet_insert_ifa+0x9e9/0xbc0 net/ipv4/devinet.c:566
     inet_rtm_newaddr+0x10d8/0x1ad0 net/ipv4/devinet.c:1001
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[9] +2 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     qdisc_alloc+0x688/0xa00 net/sched/sch_generic.c:1008
     qdisc_create_dflt+0x8e/0x4e0 net/sched/sch_generic.c:1031
     attach_one_default_qdisc net/sched/sch_generic.c:1197 [inline]
     netdev_for_each_tx_queue include/linux/netdevice.h:2711 [inline]
     attach_default_qdiscs net/sched/sch_generic.c:1215 [inline]
     dev_activate+0x378/0x1150 net/sched/sch_generic.c:1274
     __dev_open+0x67a/0x830 net/core/dev.c:1711
     __dev_change_flags+0x2fa/0x7e0 net/core/dev.c:9756
     netif_change_flags+0x88/0x1a0 net/core/dev.c:9819
     do_setlink+0xfa5/0x45a0 net/core/rtnetlink.c:3181
     rtnl_changelink net/core/rtnetlink.c:3800 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
     rtnl_newlink+0x15ad/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[10] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     fib_create_info+0x229d/0x31f0 net/ipv4/fib_semantics.c:1491
     fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134
     fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1156
     fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9795
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9824
     do_setlink+0xfa5/0x45a0 net/core/rtnetlink.c:3181
     rtnl_changelink net/core/rtnetlink.c:3800 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
     rtnl_newlink+0x15ad/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[11] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1261 [inline]
     fib_check_nh+0xca3/0x1b00 net/ipv4/fib_semantics.c:1281
     fib_create_info+0x208c/0x31f0 net/ipv4/fib_semantics.c:1501
     fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134
     fib_add_ifaddr+0x38d/0x5f0 net/ipv4/fib_frontend.c:1171
     fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9795
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9824
     do_setlink+0xfa5/0x45a0 net/core/rtnetlink.c:3181
     rtnl_changelink net/core/rtnetlink.c:3800 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
     rtnl_newlink+0x15ad/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[12] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1261 [inline]
     fib_check_nh+0xca3/0x1b00 net/ipv4/fib_semantics.c:1281
     fib_create_info+0x208c/0x31f0 net/ipv4/fib_semantics.c:1501
     fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134
     fib_add_ifaddr+0x3fb/0x5f0 net/ipv4/fib_frontend.c:1178
     fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9795
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9824
     do_setlink+0xfa5/0x45a0 net/core/rtnetlink.c:3181
     rtnl_changelink net/core/rtnetlink.c:3800 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
     rtnl_newlink+0x15ad/0x1bb0 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[13] -4 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     fib_nh_common_release+0x5c/0x430 net/ipv4/fib_semantics.c:204
     fib_nh_release net/ipv4/fib_semantics.c:218 [inline]
     free_fib_info_rcu+0xdf/0x310 net/ipv4/fib_semantics.c:230
     rcu_do_batch kernel/rcu/tree.c:2617 [inline]
     rcu_core kernel/rcu/tree.c:2869 [inline]
     rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
     smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
     kthread+0x388/0x470 kernel/kthread.c:436
     ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Call trace for vcan0[14] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     __ipv6_sock_mc_join+0x47c/0x770 net/ipv6/mcast.c:223
     join_mcast_group6 net/netfilter/ipvs/ip_vs_sync.c:1412 [inline]
     make_receive_sock net/netfilter/ipvs/ip_vs_sync.c:1553 [inline]
     start_sync_thread+0x139a/0x2880 net/netfilter/ipvs/ip_vs_sync.c:1884
     ip_vs_genl_new_daemon net/netfilter/ipvs/ip_vs_ctl.c:4469 [inline]
     ip_vs_genl_set_daemon+0x6cd/0x860 net/netfilter/ipvs/ip_vs_ctl.c:4521
     genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:1114
     genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
     genl_rcv_msg+0x61c/0x7a0 net/netlink/genetlink.c:1209
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[15] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put include/linux/netdevice.h:4548 [inline]
     __ipv6_sock_mc_join+0x53a/0x770 net/ipv6/mcast.c:236
     join_mcast_group6 net/netfilter/ipvs/ip_vs_sync.c:1412 [inline]
     make_receive_sock net/netfilter/ipvs/ip_vs_sync.c:1553 [inline]
     start_sync_thread+0x139a/0x2880 net/netfilter/ipvs/ip_vs_sync.c:1884
     ip_vs_genl_new_daemon net/netfilter/ipvs/ip_vs_ctl.c:4469 [inline]
     ip_vs_genl_set_daemon+0x6cd/0x860 net/netfilter/ipvs/ip_vs_ctl.c:4521
     genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:1114
     genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
     genl_rcv_msg+0x61c/0x7a0 net/netlink/genetlink.c:1209
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[16] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     ethnl_default_dumpit+0x1ed/0x630 net/ethtool/netlink.c:628
     genl_dumpit+0x10b/0x1b0 net/netlink/genetlink.c:1026
     netlink_dump+0x702/0xe10 net/netlink/af_netlink.c:2326
     __netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2441
     genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1075
     genl_family_rcv_msg net/netlink/genetlink.c:1191 [inline]
     genl_rcv_msg+0x5e8/0x7a0 net/netlink/genetlink.c:1209
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[17] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     ethnl_default_dumpit+0x404/0x630 net/ethtool/netlink.c:634
     genl_dumpit+0x10b/0x1b0 net/netlink/genetlink.c:1026
     netlink_dump+0x702/0xe10 net/netlink/af_netlink.c:2326
     __netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2441
     genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1075
     genl_family_rcv_msg net/netlink/genetlink.c:1191 [inline]
     genl_rcv_msg+0x5e8/0x7a0 net/netlink/genetlink.c:1209
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[18] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     packet_snd net/packet/af_packet.c:2976 [inline]
     packet_sendmsg+0x421c/0x4fd0 net/packet/af_packet.c:3114
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[19] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put include/linux/netdevice.h:4548 [inline]
     packet_snd net/packet/af_packet.c:3091 [inline]
     packet_sendmsg+0x3cdb/0x4fd0 net/packet/af_packet.c:3114
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[20] +4 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     bcm_connect+0x10b/0x4b0 net/can/bcm.c:1693
     __sys_connect_file net/socket.c:2163 [inline]
     __sys_connect+0x315/0x450 net/socket.c:2182
     __do_sys_connect net/socket.c:2188 [inline]
     __se_sys_connect net/socket.c:2185 [inline]
     __x64_sys_connect+0x7a/0x90 net/socket.c:2185
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
Call trace for vcan0[21] -4 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put include/linux/netdevice.h:4548 [inline]
     bcm_connect+0x1ae/0x4b0 net/can/bcm.c:1705
     __sys_connect_file net/socket.c:2163 [inline]
     __sys_connect+0x315/0x450 net/socket.c:2182
     __do_sys_connect net/socket.c:2188 [inline]
     __se_sys_connect net/socket.c:2185 [inline]
     __x64_sys_connect+0x7a/0x90 net/socket.c:2185
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
Call trace for vcan0[22] +3 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     bcm_can_tx+0x1e5/0x980 net/can/bcm.c:309
     bcm_tx_setup+0xe8f/0x1bf0 net/can/bcm.c:1097
     bcm_sendmsg+0x46e/0x6c0 net/can/bcm.c:1433
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[23] -3 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put include/linux/netdevice.h:4548 [inline]
     bcm_can_tx+0x694/0x980 net/can/bcm.c:351
     bcm_tx_setup+0xe8f/0x1bf0 net/can/bcm.c:1097
     bcm_sendmsg+0x46e/0x6c0 net/can/bcm.c:1433
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[24] +1 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     ___neigh_create+0xcb3/0x2360 net/core/neighbour.c:664
     neigh_add+0xc51/0xf70 net/core/neighbour.c:2136
     rtnetlink_rcv_msg+0x77e/0xbe0 net/core/rtnetlink.c:7005
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[25] +5 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     j1939_sk_bind+0x278/0xb30 net/can/j1939/socket.c:481
     __sys_bind_socket net/socket.c:1948 [inline]
     __sys_bind+0x2e9/0x410 net/socket.c:1979
Call trace for vcan0[26] +4 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     j1939_priv_create net/can/j1939/main.c:140 [inline]
     j1939_netdev_start+0x36b/0xc10 net/can/j1939/main.c:268
     j1939_sk_bind+0x853/0xb30 net/can/j1939/socket.c:506
     __sys_bind_socket net/socket.c:1948 [inline]
     __sys_bind+0x2e9/0x410 net/socket.c:1979
Call trace for vcan0[27] -5 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put+0x27/0x80 include/linux/netdevice.h:4548
     j1939_sk_bind+0x85e/0xb30 net/can/j1939/socket.c:507
     __sys_bind_socket net/socket.c:1948 [inline]
     __sys_bind+0x2e9/0x410 net/socket.c:1979
Call trace for vcan0[28] -3 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put include/linux/netdevice.h:4548 [inline]
     __j1939_priv_release net/can/j1939/main.c:166 [inline]
     kref_put include/linux/kref.h:65 [inline]
     j1939_priv_put+0x128/0x270 net/can/j1939/main.c:172
     j1939_sk_sock_destruct+0x52/0x90 net/can/j1939/socket.c:388
     __sk_destruct+0x8d/0x9d0 net/core/sock.c:2352
     rcu_do_batch kernel/rcu/tree.c:2617 [inline]
     rcu_core kernel/rcu/tree.c:2869 [inline]
     rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
     smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
     kthread+0x388/0x470 kernel/kthread.c:436
     ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Call trace for vcan0[29] +2 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold include/linux/netdevice.h:4513 [inline]
     dev_hold include/linux/netdevice.h:4536 [inline]
     dev_get_by_index+0x1b3/0x2f0 net/core/dev.c:1002
     raw_bind+0x1cc/0x7d0 net/can/raw.c:485
     __sys_bind_socket net/socket.c:1948 [inline]
     __sys_bind+0x2e9/0x410 net/socket.c:1979
Call trace for vcan0[30] +2 at
     __dev_hold include/linux/netdevice.h:4470 [inline]
     netdev_hold+0x1e/0xb0 include/linux/netdevice.h:4513
     raw_bind+0x507/0x7d0 net/can/raw.c:529
     __sys_bind_socket net/socket.c:1948 [inline]
     __sys_bind+0x2e9/0x410 net/socket.c:1979
Call trace for vcan0[31] -2 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     dev_put include/linux/netdevice.h:4548 [inline]
     raw_bind+0x525/0x7d0 net/can/raw.c:534
     __sys_bind_socket net/socket.c:1948 [inline]
     __sys_bind+0x2e9/0x410 net/socket.c:1979
Call trace for vcan0[32] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     raw_release+0x529/0xa20 net/can/raw.c:437
     __sock_release+0xb9/0x250 net/socket.c:726
Call trace for vcan0[33] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     neigh_destroy+0x364/0x5d0 net/core/neighbour.c:940
     neigh_flush_dev net/core/neighbour.c:433 [inline]
     __neigh_ifdown+0x201/0x8f0 net/core/neighbour.c:467
     neigh_ifdown+0x1f/0x30 net/core/neighbour.c:491
     fib_netdev_event+0x318/0x490 net/ipv4/fib_frontend.c:-1
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     netif_close_many+0x2ae/0x420 net/core/dev.c:1805
     unregister_netdevice_many_notify+0xb50/0x22b0 net/core/dev.c:12407
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
     __sock_sendmsg net/socket.c:812 [inline]
     sock_write_iter+0x308/0x410 net/socket.c:1269
     new_sync_write fs/read_write.c:595 [inline]
     vfs_write+0x629/0xba0 fs/read_write.c:688
     ksys_write+0x156/0x270 fs/read_write.c:740
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
Call trace for vcan0[34] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     __qdisc_destroy+0x20e/0x480 net/sched/sch_generic.c:1104
     netdev_for_each_tx_queue include/linux/netdevice.h:2711 [inline]
     dev_shutdown+0x93/0x440 net/sched/sch_generic.c:1490
     unregister_netdevice_many_notify+0x11b2/0x22b0 net/core/dev.c:12425
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[35] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     __qdisc_destroy+0x20e/0x480 net/sched/sch_generic.c:1104
     qdisc_put net/sched/sch_generic.c:1128 [inline]
     dev_shutdown+0x34c/0x440 net/sched/sch_generic.c:1493
     unregister_netdevice_many_notify+0x11b2/0x22b0 net/core/dev.c:12425
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[36] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     neigh_parms_release+0x1ae/0x240 net/core/neighbour.c:1817
     inetdev_destroy net/ipv4/devinet.c:335 [inline]
     inetdev_event+0x7f4/0x1610 net/ipv4/devinet.c:1655
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     unregister_netdevice_many_notify+0x17a5/0x22b0 net/core/dev.c:12437
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[37] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     neigh_parms_release+0x1ae/0x240 net/core/neighbour.c:1817
     addrconf_ifdown+0x17d0/0x1aa0 net/ipv6/addrconf.c:4019
     addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     unregister_netdevice_many_notify+0x17a5/0x22b0 net/core/dev.c:12437
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[38] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     in6_dev_finish_destroy+0xdd/0x1e0 net/ipv6/addrconf_core.c:182
     in6_dev_put include/net/addrconf.h:423 [inline]
     addrconf_ifdown+0x1825/0x1aa0 net/ipv6/addrconf.c:4021
     addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     unregister_netdevice_many_notify+0x17a5/0x22b0 net/core/dev.c:12437
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[39] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     raw_notify net/can/raw.c:317 [inline]
     raw_notifier+0x4a9/0x7e0 net/can/raw.c:357
     notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     unregister_netdevice_many_notify+0x17a5/0x22b0 net/core/dev.c:12437
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[40] -2 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     rx_queue_release+0x11d/0x190 net/core/net-sysfs.c:1166
     kobject_cleanup lib/kobject.c:689 [inline]
     kobject_release lib/kobject.c:720 [inline]
     kref_put include/linux/kref.h:65 [inline]
     kobject_put+0x228/0x560 lib/kobject.c:737
     net_rx_queue_update_kobjects+0x6a6/0x750 net/core/net-sysfs.c:1323
     remove_queue_kobjects net/core/net-sysfs.c:2154 [inline]
     netdev_unregister_kobject+0x113/0x450 net/core/net-sysfs.c:2310
     unregister_netdevice_many_notify+0x1d4b/0x22b0 net/core/dev.c:12472
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[41] -2 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     netdev_queue_release+0x6a/0xd0 net/core/net-sysfs.c:1916
     kobject_cleanup lib/kobject.c:689 [inline]
     kobject_release lib/kobject.c:720 [inline]
     kref_put include/linux/kref.h:65 [inline]
     kobject_put+0x228/0x560 lib/kobject.c:737
     netdev_queue_update_kobjects+0x5e3/0x6c0 net/core/net-sysfs.c:2058
     remove_queue_kobjects net/core/net-sysfs.c:2155 [inline]
     netdev_unregister_kobject+0x11f/0x450 net/core/net-sysfs.c:2310
     unregister_netdevice_many_notify+0x1d4b/0x22b0 net/core/dev.c:12472
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
Call trace for vcan0[42] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     in_dev_finish_destroy+0xa7/0x1a0 net/ipv4/devinet.c:258
     in_dev_put include/linux/inetdevice.h:290 [inline]
     inet_rcu_free_ifa+0x72/0xb0 net/ipv4/devinet.c:228
     rcu_do_batch kernel/rcu/tree.c:2617 [inline]
     rcu_core kernel/rcu/tree.c:2869 [inline]
     rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
     smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
     kthread+0x388/0x470 kernel/kthread.c:436
     ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Call trace for vcan0[43] -1 at
     __dev_put include/linux/netdevice.h:4456 [inline]
     netdev_put include/linux/netdevice.h:4523 [inline]
     unregister_netdevice_many_notify+0x1f9b/0x22b0 net/core/dev.c:12482
     rtnl_delete_link net/core/rtnetlink.c:3552 [inline]
     rtnl_dellink+0x5d4/0x820 net/core/rtnetlink.c:3594
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x780/0x920 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895
     sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
balance as of vcan0[43] is 1