RTOS/PROCESSOR-SDK-AM437X: NDK thread abort exception

Thanks Garrett,

It will help for sure.

My software already dumps the exception report to the uart.

I forgot to say that the fault has happened with the release version, running without the emulator and boot from a SD card.

I really believe that there is an unhandled condition on the NDK.

regards,

Marcio

Hi Garrett,

I´ve managed to reproduce the problem, sending a 256 udp packet in less than 10 microseconds.

Attached are screenshots showing the Debug and ROV views. Everything points to NIMU_pktService in cpsw_nimu_eth.c.

Edited 1:

After a quick analysis:

Function EMAC_rxPacket (in emac_drv_v4.c) receives a packet descriptor (p_cslPkt_desc) and passes it to NIMU, calling nimu_rx_pkt_cb (in cpsw_nimu_eth.c).

I beleive some other function will use the buffer within the descriptor (field AppPrivate) and releases it.

Function EMAC_rxPacket then calls nimu_alloc_pkt (in cpsw_nimu_eth.c) to allocate a new buffer, which is copied to p_cslPkt_desc which is the return parameter of EMAC_rxPacket.

If nimu_alloc_pkt fails to allocate a buffer, p_new_pkt_desc will be null, p_cslPkt_desc will point to the same buffer.

In some point in time, the EMAC_rxPacket will receive again the same descriptor and will pass it to nimu_rx_pkt_cb, that will cause an attempt to release the same buffer again and an error, which I am not sure its is handled.

Edited 2:

I´ve changed EMAC_rxPacket to the following. It seems the problem went away. It is not a good solution because is still loses packets, but at least the program is not crashing.

static EMAC_PKT_DESC_T* EMAC_rxPacket(Handle      hApplication, EMAC_PKT_DESC_T*   p_cslPkt_desc)
{
    EMAC_PKT_DESC_T*    p_new_pkt_desc;
    uint32_t from_port = 0U;

    from_port = ((p_cslPkt_desc->Flags & EMAC_PKT_FLAG_FROM_PORT_MASK) >> EMAC_PKT_FLAG_FROM_PORT_SHIFT) -1U;
    if( from_port < EMAC_NUM_MAX_MAC_PORTS )
    {
// MB: 2018-01-29
#if 0
        EMAC_RX_PKT(from_port, p_cslPkt_desc);
        p_new_pkt_desc = EMAC_ALLOC_PKT(from_port, EMAC_PKT_SIZE(from_port));
    
        if (p_new_pkt_desc != NULL)
        {
            memcpy((void *)p_cslPkt_desc, (void *)p_new_pkt_desc, sizeof(EMAC_PKT_DESC_T));
        }
    }
#else
        p_new_pkt_desc = EMAC_ALLOC_PKT(from_port, EMAC_PKT_SIZE(from_port));
        if (p_new_pkt_desc != NULL)
        {
            EMAC_RX_PKT(from_port, p_cslPkt_desc);

            memcpy((void *)p_cslPkt_desc, (void *)p_new_pkt_desc, sizeof(EMAC_PKT_DESC_T));
        }
    }
#endif
    return p_cslPkt_desc;
}

regards,

Marcio.

Capture_Exception_20180129.zip

Ok. Thank you!