[lwip-users] tcp_connect() trying to insert pcb into tcp_active_pcbs (it's already there!)

[Michael Williamson]

Hi,

I've been using LWIP for a while now (a port to the TI'6711) and have 
been bumping into an odd problem where the TCP_REG() macro is trying to 
stuff a pcb onto the tcp_active_pcbs list, but the pcb it's working with 
is already on the list.  The list gets corrupted at this point and the 
tcp_tmr() thread gets locked in an infinite loop.  The TCP_REG in 
question is in the tcp_connect() call in tcp.c.

We are using the sockets api, and the test case basically has a client 
thread periodically trying to connect to a server socket on a box that 
isn't on the network.

I suspect that the problem may ultimately be a client software bug 
(using an invalid socket or not cleaning up properly?), but was 
wondering if anyone out there has seen this behavior?  As far as I can 
tell, the only way to get into this mode is if we were trying to connect 
an already in-use socket... bad, but shouldn't result in death-of-a-stack...

-Mike

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