[lwip-users] Strange values appearing inside an LWIP packet buffer

[Peter]

Hi All,

I am seeing these curious values in the LWIP buffers,
PBUF_POOL_BUFSIZE. This is some distance after the packet data I would
normally expect to see there.

>0x20003770  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>00000000  ................................
>0x20003790  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>00000000  ................................
>0x200037B0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>08941800  ................................
>0x200037D0  00000000 00000000 08A01800 00000000 00000000 00000000 00000000 
>00000000  .......... .....................
>0x200037F0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>00000000  ................................
>0x20003810  00000000 00000000 00000000 00000000 08E81800 00000000 00000000 
>08F41800  ..................è...........ô.
>0x20003830  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>00000000  ................................
>0x20003850  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>00000000  ................................
>0x20003870  00000000 00000000 00000000 00000000 00000000 00000000 00000000 
>00000000  ................................
>0x20003890  00000000 00000000 00000000 00000000 00000000 00000000 00000000     
>      ............................

Little-endian so the bytes are 08 e8 18 00 and a uint32_t would be
0x0018e808 etc.

The addresses move about which makes it hard to do a watchpoint but I
managed to catch it once and the code was some heap code, so it looked
possibly legitimate. My concern is stray pointers.

Thank you in advance for any comments.

Peter