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Re: [lwip-users] Infinite hang in tcp_slowtmr()

From: Enrico Murador - Research & Development - CET
Subject: Re: [lwip-users] Infinite hang in tcp_slowtmr()
Date: Wed, 14 Oct 2015 10:22:58 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

Hi Stephen,
Maybe your workaround is not a safe way to overcome the problem: at that point the pcb chain is already corrupted (and probably unrecoverable?).

What compiler/toolchain are you using?


On 13/10/2015 11:48, Sylvain Rochet wrote:
Hi Stephen,

On Tue, Oct 13, 2015 at 10:15:42AM +0200, Sylvain Rochet wrote:
On Mon, Oct 12, 2015 at 04:59:19PM -0500, Stephen Cowell wrote:
On 10/12/2015 3:41 PM, Sylvain Rochet wrote:
On Mon, Oct 12, 2015 at 02:51:14PM -0500, Stephen Cowell wrote:
I find that I sometimes get an infinite loop when stepping to
I didn't have to read further. As usual, it looks like a broken port or
usage which violate lwIP threading model.


- Do *NOT* call anything in interrupt context, nothing, never,
absolutely never, use your OS semaphore signaling to an
Ethernet/serial/… RX thread
I don't think I'm doing that, Sylvain... this is non-OS, so there
are no 'threads'.   Atmel wrote the port.  I'm running sntp and ftpd, they
hook in using their own _init() routines that have not been
But there are probably interrupts, which is even worse. Could you first 
check that no lwIP functions are called in interrupts contexts ? 
Probably around the macb driver.

If I have time I will fetch the Atmel port for SAM4E/bare-metal and 
take a short look at it.
It looks sane from a quick look. I don't really understand why there are 
not using sys_check_timeouts() and rewrote everything in the ethernet.c 
"static timers_info_t gs_timers_table[]" stuff. Since you are having 
issue in timers context could you check this part is ok ? Removing all 
the Atmel timers stuff and calling sys_check_timeouts() in the main loop 
could be an easy check.


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Enrico Murador

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