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[lwip-users] lwIP crash?!

From: ThomasJ
Subject: [lwip-users] lwIP crash?!
Date: Mon, 19 Nov 2012 02:31:48 -0800 (PST)

Hi all

I'm using lwIP (latest stable) on a LPC1788 and FreeRTOS.
I'm using one single TCP connection to a PC server. Only one packet is send
at a time. Using the Netconn API

I do have some difficulties getting the stack running flawless.

It is just a matter of time before something goes wrong and it stop
receiving new data. Although the stack still runs. Packet are received but
not delivered to the netconn API (?). It is connected to the cooperate
network, so it receive at lot of data, that is not part of the actual TCP
connection. But it still has to process them. I assume the packets send from
the PC server are received (Server log and Wireshark say they are), but not
received by the applications receive thread. Wireshark also has send the
TCP/IP syn for that packet. But never arrives on the netconn receive call!!!

I also have some Hardfaults. This especially happens when I increase the
LPC_NUM_BUFF_RXDESCS value. A value of 5 makes this happen very soon. But it
also seen with smaller values. (seems not to be the case with

I have tried lower the LPC_NUM_BUFF_RXDESCS to 2 (Even though it is not
allowed). It seems to work better then 3. But haven't have enough testing
time to be sure.

Any suggestions how I can debug this? Something to try or change?
Better way using raw mode and supply the callback functions myself? (But
would to much different then already done by Nettconn)

Attaches is the call stack with LPC_NUM_BUFF_RXDESCS 5 after the hardfault.
The TCP connection on done and this happens short after.


The callstack seems strange. The vPacketReceiveTask is the FreeRTOS task
that waits for packets from the ISR.
It then handles all packets with lpc_enetif_input function before it is
ready to receive another packet.

How can this function be twice in the callstack just after each other? And
way does the callstack start with the lpc_enetif_input that is only calles
from the task?
Is there some heap/stack memory corruption???

Any help is appreciated..


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