Re: [lwip-users] lwip adding a pcb into active lsit which is already inserted

[Sergio R. Caprile]

You should not free the pcb in the error callback, it does not get a pcb 
as a parameter (unless you provide it). It is intended for you to free 
your resources (if any).

Some people advocate for the check your goesintos mantra.
I personally prefer smaller and tighter code.
There is a nice compromise in the form of assertions that can be easily 
disabled once code has been (kind of) debugged, and lwIP more or less 
follows this approach.
If you could give more details on the exact sequence you called 
functions and/or the code followed, perhaps one of the developers 
"fixes" this one you've found and an assertion is triggered next time. 
Or did you disable assertions ?