Re: [lwip-users] Out of memory in PCP_PCB pool after 2^32 milliseconds

[Trampas Stern]

Increase the counter to a uint64_t. 

You can also start the counter at something other than zero to prove root cause faster.

Trampas

On Fri, May 28, 2021 at 7:08 AM Adam Baron <vysocan76@gmail.com> wrote:

Czesc Tomek :),

I'll try to add it. Thanks.

However, I feel like it is rather related to the problem of overflowing a uint32 counter of some kind. Since the TCP_PCBs are not freed after 2^32 ticks.

Adam

pá 28. 5. 2021 v 9:44 odesílatel Tomasz W <wilkxt@gmail.com> napsal:

Hi (Cześć)
Lok for this https://lists.nongnu.org/archive/html/lwip-devel/2020-12/msg00014.html
In my case it solved the problem of the web server dying after a few days


pt., 28 maj 2021 o 08:58 Adam Baron <vysocan76@gmail.com> napisał(a):
>
> Hello all,
>
> I'm having a small STM32F4 application running on devel branch of lwip, It includes httpd, sntp, smtp client, and mqtt client. All is running well until the fifth day, when mqtt client starts to receive pbuf=NULL and disconnects. My reconnect routine reconnects it in some short time, but it receives pbuf=NULL shortly after.
>
> Also later on I noticed in log: memp_malloc: out of memory in pool TCP_PCB.
> I'm having defined MEMP_NUM_TCP_PCB as 30 and it seems enough for normal operation, I also upped it to 50, but ended with the same problem
> In statistics the NUM_TCP_PCB increases and decreases as it should, but after uptime past 5 days it stays high with an error flag triggered.
>
> Quite interestingly it happens exactly after 2^32 milliseconds uptime. I tried to keep OpenOCD connected to start to peek in, but yet I did not manage to keep the openOCD running for so long without dropping the connection.
>
> Does anyone have any ideas please?
>
> Thanks in advance,
> --
> 731435556
> Adam Baron
> _______________________________________________
> lwip-users mailing list
> lwip-users@nongnu.org
> https://lists.nongnu.org/mailman/listinfo/lwip-users



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Pozdrawiam
Tomek

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731435556
Adam Baron

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