unregister_netdevice: waiting for vcan0 to become free. Usage count = 3
ref_tracker: netdev@ffffaf80157206e0 has 1/2 users at
     ref_tracker_alloc+0x1ba/0x536 lib/ref_tracker.c:276
     __netdev_tracker_alloc include/linux/netdevice.h:4528 [inline]
     netdev_hold include/linux/netdevice.h:4557 [inline]
     j1939_ecu_create_locked+0x22a/0x4c2 net/can/j1939/bus.c:159
     j1939_local_ecu_get+0x1a6/0x23a net/can/j1939/bus.c:293
     j1939_sk_bind+0x738/0xc14 net/can/j1939/socket.c:529
     __sys_bind_socket net/socket.c:1945 [inline]
     __sys_bind_socket net/socket.c:1937 [inline]
     __sys_bind+0x1fe/0x274 net/socket.c:1976
     __do_sys_bind net/socket.c:1981 [inline]
     __se_sys_bind net/socket.c:1979 [inline]
     __riscv_sys_bind+0x6e/0xa0 net/socket.c:1979
     syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
     do_trap_ecall_u+0x4ca/0x658 arch/riscv/kernel/traps.c:341
     handle_exception+0x168/0x174 arch/riscv/kernel/entry.S:237

ref_tracker: netdev@ffffaf80157206e0 has 1/2 users at
     ref_tracker_alloc+0x1ba/0x536 lib/ref_tracker.c:276
     __netdev_tracker_alloc include/linux/netdevice.h:4528 [inline]
     netdev_hold include/linux/netdevice.h:4557 [inline]
     j1939_priv_create net/can/j1939/main.c:140 [inline]
     j1939_netdev_start+0x2a4/0x944 net/can/j1939/main.c:268
     j1939_sk_bind+0x3fc/0xc14 net/can/j1939/socket.c:506
     __sys_bind_socket net/socket.c:1945 [inline]
     __sys_bind_socket net/socket.c:1937 [inline]
     __sys_bind+0x1fe/0x274 net/socket.c:1976
     __do_sys_bind net/socket.c:1981 [inline]
     __se_sys_bind net/socket.c:1979 [inline]
     __riscv_sys_bind+0x6e/0xa0 net/socket.c:1979
     syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
     do_trap_ecall_u+0x4ca/0x658 arch/riscv/kernel/traps.c:341
     handle_exception+0x168/0x174 arch/riscv/kernel/entry.S:237