unregister_netdevice: waiting for vcan0 to become free. Usage count = 3
ref_tracker: netdev@ffff8881bed40700 has 1/2 users at
     j1939_ecu_create_locked+0x1c9/0x400
     j1939_local_ecu_get+0xeb/0x220
     j1939_sk_bind+0x70a/0xc60
     __sys_bind+0x2e3/0x410
     __x64_sys_bind+0x7a/0x90
     do_syscall_64+0x174/0x580
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff8881bed40700 has 1/2 users at
     j1939_netdev_start+0x387/0xb20
     j1939_sk_bind+0x946/0xc60
     __sys_bind+0x2e3/0x410
     __x64_sys_bind+0x7a/0x90
     do_syscall_64+0x174/0x580
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

