Re: [lwip-users] pbuf multiple assertions

[Víctor Mateo]

 

> On Behalf Of V?ctor Mateo We have an annoying error using lwIP. Our software is a NIOSII C/C++ application, without Operating System and Superloop.
> We are experiencing intermittent errors while trying to receive an UDP message, proccess data and send this proccesed data back.
> Two common errors that we get on NIOS console are:
> -Assertion "bad pbuf type" failed at line 548 in ../lwIP/src/core/pbuf.c
> -Assertion "p->ref == 1" failed at line 599 in ../lwIP/src/core/ipv4/ip.c
Can we see the UDP packet handling code?  It sounds like memory overwriting or using a NULL pbuf.

 

Bill

Yes. Here is the Rx_UDP() and callback function UDP_Decoder():

--------------------------------------------------------------------------------------------------------------------------------------------

static void UDP_decoder(void *arg, struct udp_pcb *pcb_new, struct pbuf *p, struct ip_addr *addr, u16_t port)

{
    alt_u8 *param_pointer;    
    Rx_Command= NONE;                            
    LWIP_UNUSED_ARG(arg);
    if(p == NULL)
        return;
    memcpy ( buf, p->payload, MAX_UDP_LENGHT );
        
    if( !strncmp ( (void*) HEADER_PARAMS, (void*)buf,6 ) ) {
      //:More Code Here://        
    } 
    else if( !strncmp ( (void*) HEADER_PARAM2, (void*)buf,6 ) ) {
        //:More Code Here://               
    }
         
    pbuf_free(p); 
    udp_remove(pcb_new);
   
}


void Rx_UDP() {
    struct udp_pcb *pcb_new;
    pcb_new = udp_new();
    udp_bind(pcb_new, IP_ADDR_ANY, FPGA_PORT);
    udp_recv(pcb_new , UDP_decoder, NULL);
}

------------------------------------------------------------------------------------------------------------------------------------------------

We call Rx_UDP() in an infinite while(1), so we can update parameters anytime we send it trough the host.

Maybe I am not "closing" fine pbuf or pcb? Should I use "udp_disconnect(pcb_new)" or anything else?