Problem about porting TCP/IP Stack

[Christian Mauderer]

On 27/03/2020 15:58, jameszxj wrote:
> Hi all,
>         Since rtems-libbsd is too heavy for our project, so I tried to
> port Lightweight TCP/IP stacks.  First I tried lwip, it worked but
> crashed now and then.
> The PC pointed at function _Heap_Block_split()，I could not figure it
> out. So I tried cycloneTCP . It is more simple than lwip.  But I
> encountered the same problem.
> System still crashed at _Heap_Block_split() sometimes (random),  It made
> me crazy :(
>        I tried on diffrent CPUs (zynq7020, sunxi-t3), the problem was
> still there.  _Heap_Block_split() is a core function, It seems to have
> nothing to do with the stack.
> Attachments are error messages and disassembly code. Any advices?
>        Thanks.
> 
> 
> 

Hello,

I'm quite sure that I've seen some mails regarding lwIP. So there should
be already users for that.

Without having a detailed look at the crash message: If there are
problems with the heap you might want to use

    --enable-rtems-debug

during RTEMS configure and maybe add

    #define CONFIGURE_STACK_CHECKER_ENABLED

to your configuration. Problems with the heap can be from some part of
the application writing over the end of a buffer or similar. If that
destroys heap structures, you might get problems as soon as RTEMS want's
to do something with the heap. The rtems_debug enables quite a lot of
run time checks like a heap protection. That can help finding the bug.

Note that you have to re-build all libraries after you enable or disable
rtems-debug because some data structures change with that.

Best regards

Christian
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