Hello Adam,
LWIP uses the TIME_LESS_THAN macro to handle integer overflows. Please
have a look at the usage in /core/timeouts.c/ in /sys_check_timeouts()/:
/* Check if timer's expiry time is greater than time and care about u32_t
wraparounds */
#define TIME_LESS_THAN(t, compare_to) ( (((u32_t)((t)-(compare_to))) >
LWIP_MAX_TIMEOUT) ? 1 : 0 )
Paul
Am 28.05.2021 um 21:25 schrieb vysocan [via lwIP]:
Hello Trampas,
thanks for the hints. I initialized the sys ticks with 2^32 - 120
seconds, and I got mqtt pbuf=NULL in around 120 seconds + 120 keep
alive seconds.
The ChibiOs sys_arch.c port includes sys_now() (current time in
milliseconds) following simplified implementation:
return ((u32_t)chVTGetSystemTimeX() - 1) / 10 + 1;
Since it ticks at 100 uS.
I guess it might cause the problems as it overflows back to 0 leaving
the lwip timers waiting for value higher than (2^32)/10.
To support my guess, I turned on another debug option and last lwip
timer message I see is:
sys_timeout: 2000C5DC abs_time=429497730 handler=ip_reass_tmr arg=805B28C
Adam
pá 28. 5. 2021 v 13:45 odesílatel Trampas Stern <[hidden email]
</user/SendEmail.jtp?type=node&node=36469&i=0>> napsal:
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 <[hidden email]
</user/SendEmail.jtp?type=node&node=36469&i=1>> 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 <[hidden email]
</user/SendEmail.jtp?type=node&node=36469&i=2>> napsal:
Hi (Cześć)
Lok for this
https://lists.nongnu.org/archive/html/lwip-devel/2020-12/msg00014.html
<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 <[hidden email]
</user/SendEmail.jtp?type=node&node=36469&i=3>> 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
> [hidden email]
</user/SendEmail.jtp?type=node&node=36469&i=4>
> https://lists.nongnu.org/mailman/listinfo/lwip-users
<https://lists.nongnu.org/mailman/listinfo/lwip-users>
--
Pozdrawiam
Tomek
_______________________________________________
lwip-users mailing list
[hidden email] </user/SendEmail.jtp?type=node&node=36469&i=5>
https://lists.nongnu.org/mailman/listinfo/lwip-users
<https://lists.nongnu.org/mailman/listinfo/lwip-users>
--
731435556
Adam Baron
_______________________________________________
lwip-users mailing list
[hidden email] </user/SendEmail.jtp?type=node&node=36469&i=6>
https://lists.nongnu.org/mailman/listinfo/lwip-users
<https://lists.nongnu.org/mailman/listinfo/lwip-users>
_______________________________________________
lwip-users mailing list
[hidden email] </user/SendEmail.jtp?type=node&node=36469&i=7>
https://lists.nongnu.org/mailman/listinfo/lwip-users
<https://lists.nongnu.org/mailman/listinfo/lwip-users>
--
731435556
Adam Baron
_______________________________________________
lwip-users mailing list
[hidden email] </user/SendEmail.jtp?type=node&node=36469&i=8>
https://lists.nongnu.org/mailman/listinfo/lwip-users
<https://lists.nongnu.org/mailman/listinfo/lwip-users>
------------------------------------------------------------------------
If you reply to this email, your message will be added to the
discussion below:
http://lwip.100.n7.nabble.com/Out-of-memory-in-PCP-PCB-pool-after-2-32-milliseconds-tp36460p36469.html
<http://lwip.100.n7.nabble.com/Out-of-memory-in-PCP-PCB-pool-after-2-32-milliseconds-tp36460p36469.html>
To unsubscribe from lwIP, click here
<http://lwip.100.n7.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=2&code=cGF1bEBmb2N1cy1nbWJoLmNvbXwyfC0xNzg4MTY3ODg4>.
NAML
<http://lwip.100.n7.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
_______________________________________________
lwip-users mailing list
lwip-users@nongnu.org
https://lists.nongnu.org/mailman/listinfo/lwip-users
