Re: [lwip-devel] [bug #36167] tcp server crash when client closes

[Mason]

christian wrote:

> We have a ftp server implementation that uses lwip as stack. When the server
> has the connection stablished and the client (on a different linux host)
> closes the socket, the lwip stack receives the FIN flag and the state machine
> goes to close-wait. However, the stack fails in an assert in the tcp_recved
> function:
> 
> LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n", len <= 0xffff -
> pcb->rcv_wnd );
> 
> In the call to tcp_recved len is 1 and pcb->rcv_wnd is 0xffff.
> 
> We have TCP_WND set to 0xffffU.

I have
#define TCP_MSS 1460
#define TCP_WND (40*TCP_MSS)
#define TCP_SND_BUF (8*TCP_MSS)
#define TCP_SND_QUEUELEN 16

Does your stack still crash with these values?

-- 
Regards.