Re: [lwip-users] TCP packet out-of-order

[Sergio R. Caprile]

I see your out-of-order friend in frame #11 looks very much like frame 
#8 revisited. I would say that is a DMA driver glitch (are you using DMA 
?), however, the IP ID field is different, so it looks more like a 
resend, due to frame #9 being internally lost; however, this does not 
look consistent with frame #10. I see frame #10 is 700us after the ACK, 
while others are usually 200us after the ACK. We might have something 
here...

Maybe
> > you might be not paying attention to single-threading rules for
> > low-level functions and trashing your memory,
> > your application might be trashing memory.
your DMA driver is messing around,
or we found an elusive lwIP bug.

Can you please
 describe your driver,
 describe your main loop
 confirm you don't call lwIP from main loop and interrupts, single 
context only.
 post your lwipopts file,
 post how you are using the RAW API,
 and try with a simple known-good app like netio if you run into the 
same issue ?