Bill Auerbach wrote:
> From an empirical standpoint, lwIP is used in far too many places for there
> to be this significant of a bug. I’d look for a compiler bug or some other
> issue. I seriously doubt it’s a bug in lwIP. Some of my company’s users run
> our systems 24/7 sending lots of data through lwIP and I’d hear about it
> really fast if there was this kind of a TCP lockup.
I'm flattered by your opinion but I fear this does not prevent lwIP from having
bugs :-)
In this case, I think I fixed a bug in git master not too long ago (#36153),
here is the change, maybe it fixes things for you:
@@ -658,6 +662,10 @@ tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len,
u8_t apiflags)
last_unsent->len += concat_p->tot_len;
#if TCP_CHECKSUM_ON_COPY
if (concat_chksummed) {
+ /*if concat checksumm swapped - swap it back */
+ if (concat_chksum_swapped){
+ concat_chksum = SWAP_BYTES_IN_WORD(concat_chksum);
+ }
tcp_seg_add_chksum(concat_chksum, concat_chksummed, &last_unsent->chksum,
&last_unsent->chksum_swapped);
last_unsent->flags |= TF_SEG_DATA_CHECKSUMMED;
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