[lwip-users] Dead loop inside tcp_output

[David Chance]

Hi there,

I am using lwip 1.4.1.

Once a while, my program will stay inside the following for loop forever, with the useg->next pointing back to useg, creating a dead loop

tcp_output(struct tcp_pcb *pcb){

.....

  /* useg should point to last segment on unacked queue */

  useg = pcb->unacked;

  if (useg != NULL) {

    for (; useg->next != NULL; useg = useg->next);

  }

....

I don't know how I got into this mode.

Can anyone shine me light what I could be doing wrong?

Thanks!

Dave