canIoCtlInit failes with canERR_PARAM (-1) on Kvaser Leaf Light v2 for Linux

KvaserBus.init の canIOCTL_SET_LOCAL_TXACK に対する canIoCtlInit 呼び出しから開始し、提供された Bus 構成と Kvaser Leaf Light v2 を使って再現しながら、関連する issue #2051 と動作を比較します。Kvaser バスが Linux 上で正常に初期化され、local-TX-ack の動作を損なわないことをデバイスでの再現によって確認できれば完了です。

Describe the bug

Creating a bus fails during initialization. I'm using the Kvaser backend under Linux with a Kvaser Leaf Light v2. Using the Leaf Light v2 on Windows the same function is successful

import can

bus = can.Bus(
    interface="kvaser",
    channel=0,
    bitrate=500000,
)

raises

can.interfaces.kvaser.canlib.CANLIBOperationError:
Function canIoCtl failed - Error in parameter [Error Code -1]

To Reproduce

1. Attach a Kvaser Leaf Light dongle (I used the Leaf V2)
2. initialize the bus with can.interface.Bus(interface='kvaser', channel=0, bitrate=500000)

Expected behavior

The bus will initialize without any errors thrown

Additional context

OS and version: Fedora 44
Python version: 3.14.6
python-can version: 4.6.1
python-can interface/s (if applicable): Kvaser Leaf Light v2 and Kvaser Linux SDK 5.52

Investigateion

I verified that...

• can.detect_available_configs() correctly discovers the device.
• canOpenChannel() succeeds
• the Channel can be opened directly using the CANlib bindings
• the failure occurs during the initialization of canIoCtlInit() calls in KbaserBus.__init__()

The failure occurs on canIOCTL_SET_LOCAL_TXACK or specifically...

canIoCtlInit(
    self._read_handle,
    canstat.canIOCTL_SET_LOCAL_TXACK,
    ctypes.byref(ctypes.c_byte(local_echo)),
    1,
)

Work-Around

commenting out this section of code allows me to continue initializing the bus and my program runs smoothly.

Potentially related Issue

#2051