unregister_netdevice: waiting for vcan0 to become free. Usage count = 3
ref_tracker: netdev@ffff888035258700 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4496 [inline]
     netdev_hold include/linux/netdevice.h:4525 [inline]
     j1939_ecu_create_locked+0x1c9/0x400 net/can/j1939/bus.c:159
     j1939_local_ecu_get+0xeb/0x220 net/can/j1939/bus.c:293
     j1939_sk_bind+0x70a/0xc60 net/can/j1939/socket.c:529
     __sys_bind_socket net/socket.c:1920 [inline]
     __sys_bind+0x2e3/0x410 net/socket.c:1951
     __do_sys_bind net/socket.c:1956 [inline]
     __se_sys_bind net/socket.c:1954 [inline]
     __x64_sys_bind+0x7a/0x90 net/socket.c:1954
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff888035258700 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4496 [inline]
     netdev_hold include/linux/netdevice.h:4525 [inline]
     j1939_priv_create net/can/j1939/main.c:140 [inline]
     j1939_netdev_start+0x387/0xb20 net/can/j1939/main.c:268
     j1939_sk_bind+0x946/0xc60 net/can/j1939/socket.c:506
     __sys_bind_socket net/socket.c:1920 [inline]
     __sys_bind+0x2e3/0x410 net/socket.c:1951
     __do_sys_bind net/socket.c:1956 [inline]
     __se_sys_bind net/socket.c:1954 [inline]
     __x64_sys_bind+0x7a/0x90 net/socket.c:1954
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f