[lwip-devel] [bug #27791] null pointer dereference (pcb->unacked == 0) in tcp_in.c:tcp_process

[Simon Goldschmidt]

Follow-up Comment #5, bug #27791 (project lwip):

In lwIP, there is no such thing as asynchronous reception (it's simply not
supported).

What you have to do is: if you are using the tcpip_thread, your netif->input
must be set to tcpip_input, not ip_input or ethernet_input (pass tcpip_input
to netif_add). This ensures RX packets are passed to an mbox and are not
processed until tcp_output returns.

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