You need to check for concurrency issues, are you calling lwip from different threads and/or interrupts?
|ethernet_input (structpbuf *p,structnetif *netif)Line:186ethernetif_input (structnetif *netif)Line:788ethernet_task Line:247|
Like this, is this an ethernet task calling into non-thread safe lwip?

http://www.nongnu.org/lwip/2_0_x/pitfalls.html

Cheers
Jens
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