lwip出现错误: recvmbox must be deallocated before calling this function怎么解决?

根据协议栈的函数，调试一下，看看有没有free  mbox{:1:}

void
netconn_free(struct netconn *conn)
{
  LWIP_ASSERT("{:9:}CB must be deallocated outside this function", conn->pcb.tcp == NULL);

#if LWIP_NETCONN_FULLDUPLEX
  /* in fullduplex, netconn is drained here */
  netconn_drain(conn);
#endif /* LWIP_NETCONN_FULLDUPLEX */

  LWIP_ASSERT("recvmbox must be deallocated before calling this function",
              !sys_mbox_valid( conn->recvmbox));
#if LWIP_TCP
  LWIP_ASSERT("acceptmbox must be deallocated before calling this function",
              !sys_mbox_valid( conn->acceptmbox));