Re: [lwip-users] Underflow problem when reconnecting multiple times.

[Sergio R. Caprile]

mmmm I'm starting to get lost, could you please post some reduced code 
so I can try to follow what you are doing with the stack ?

BTW, you said "I am using a single threaded custom OS with lwip 1.4.1 in 
raw mode" Are you absolutely sure you are calling all lwIP low-level 
functions from the very same execution thread/context ? Memory problems 
are quite correlated with reentrance, that is, more than one thread, 
including ints + main on a bare metal. Please double check; did you 
check your port with some known good application ? I've seen some 
vendors calling netif rx from interrupts and txing on main loop. No good.