unregister_netdevice: waiting for vxcan1 to become free. Usage count = 3
ref_tracker: vxcan1@ffff88805d0c05b8 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4112 [inline]
     netdev_hold include/linux/netdevice.h:4141 [inline]
     j1939_session_new+0x1df/0x540 net/can/j1939/transport.c:1513
     j1939_tp_send+0x337/0x870 net/can/j1939/transport.c:2042
     j1939_sk_send_loop net/can/j1939/socket.c:1156 [inline]
     j1939_sk_sendmsg+0xa69/0x1240 net/can/j1939/socket.c:1279
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg net/socket.c:745 [inline]
     ____sys_sendmsg+0x61b/0x980 net/socket.c:2595
     ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649
     __sys_sendmmsg+0x2ca/0x510 net/socket.c:2735
     __do_sys_sendmmsg net/socket.c:2764 [inline]
     __se_sys_sendmmsg net/socket.c:2761 [inline]
     __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2761
     do_syscall_x64 arch/x86/entry/common.c:46 [inline]
     do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
     entry_SYSCALL_64_after_hwframe+0x68/0xd2

ref_tracker: vxcan1@ffff88805d0c05b8 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4112 [inline]
     netdev_hold include/linux/netdevice.h:4141 [inline]
     j1939_priv_create net/can/j1939/main.c:140 [inline]
     j1939_netdev_start+0x37c/0xaf0 net/can/j1939/main.c:268
     j1939_sk_bind+0x8a7/0xc00 net/can/j1939/socket.c:497
     __sys_bind+0x2f0/0x3f0 net/socket.c:1856
     __do_sys_bind net/socket.c:1867 [inline]
     __se_sys_bind net/socket.c:1865 [inline]
     __x64_sys_bind+0x7a/0x90 net/socket.c:1865
     do_syscall_x64 arch/x86/entry/common.c:46 [inline]
     do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
     entry_SYSCALL_64_after_hwframe+0x68/0xd2