In my case I had running Http and the problem was while closing connection,
by mistake i was trying to free an already freed connection in
'http_closed'. So it is better to call tcp_close if the connection is still
active otherwise It will go to free the connection again.

On Tue, 28 Apr, 2020, 7:46 pm kvik86, <[email protected]> wrote:

> Dear all,
>
> I encountered a problem using the STM32 H7 cube port of lwip. I frequently
> see the processor stuck in the tcp timer loop (tcp_fasttmr, tcp_slowtmr) as
> it iterates over the tcp_pcb-s. One of them points to itself in the next
> field, so it stucks in the loop.
> This hasn't happened until I had only one active connection, but I can't
> rule it out.
>
> Any advices?
> What could cause the problem?
>
>
> Thanks!
>
>
>
> --
> Sent from: http://lwip.100.n7.nabble.com/lwip-users-f3.html
>
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