有线网络有概率导致系统卡死

发布于 2022-06-14 18:31:09 浏览：869 订阅该版

采用lwip（2.1.2） +  DP83848C

有线网络tcp通信，每个服务端100ms发送一个心跳包，设备收到心跳包后应答，使用过程中有概率提示 Should not happen!， 在源码中添加错误码打印，错误码为 -2（-RT_ETIMEOUT），返回超时
![微信截图_20220614182633.png](https://oss-club.rt-thread.org/uploads/20220614/ee8e8ab05d649f6ccd85c9d7fcc1e33b.png "微信截图_20220614182633.png")

实际查看源码，等待时间设置是 RT_WAITING_FOREVER ，不应该返回这个值
```c
static void eth_rx_thread_entry(void* parameter)
{
    struct eth_device* device;

while (1)
    {
        rt_err_t ec = rt_mb_recv(ð_rx_thread_mb, (rt_ubase_t *)&device, RT_WAITING_FOREVER);
        if (ec == RT_EOK)
        {
            rt_base_t level;
            struct pbuf *p;

/* check link status */
            if (device->link_changed)
            {
                int status;
                rt_uint32_t level;

level = rt_hw_interrupt_disable();
                status = device->link_status;
                device->link_changed = 0x00;
                rt_hw_interrupt_enable(level);

if (status)
                    netifapi_netif_set_link_up(device->netif);
                else
                    netifapi_netif_set_link_down(device->netif);
            }

level = rt_hw_interrupt_disable();
            /* 'rx_notice' will be modify in the interrupt or here */
            device->rx_notice = RT_FALSE;
            rt_hw_interrupt_enable(level);

/* receive all of buffer */
            while (1)
            {
                if(device->eth_rx == RT_NULL) break;
                
                p = device->eth_rx(&(device->parent));
                if (p != RT_NULL)
                {
                    /* notify to upper layer */
                    if( device->netif->input(p, device->netif) != ERR_OK )
                    {
                        LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: Input error\n"));
                        pbuf_free(p);
                        p = NULL;
                    }
                }
                else break;
            }
        }
        else
        {
            rt_kprintf("error: %d\n", ec);
            LWIP_ASSERT("Should not happen!\n",0);
        }
    }
}
```