[lwip-users] need urgent help in debugging retransmission issue

[ankish]

wireshark_retransmission.pcapng
<http://lwip.100.n7.nabble.com/file/t2176/wireshark_retransmission.pcapng>  

        
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101450, unacked->seqno 101191:101450 
tcp_receive: removing 101191:101450 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
pbuf_remove_header: old 0xa00092fe new 0xa0009305 (7) 
pbuf_free(0xa00092b4) 
pbuf_free: deallocating 0xa00092b4 
pbuf_alloc(length=12) 
pbuf_alloc(length=12) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 66 
(index=0) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 0) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa00091bc 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa00091bc (free desc=0) 
lpc_low_level_input: Packet received: 0xa0009eec, size 66 (index=0) 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa0009f00 new 0xa0009f0e (14) 
pbuf_remove_header: old 0xa0009f0e new 0xa0009f22 (20) 
pbuf_remove_header: old 0xa0009f22 new 0xa0009f36 (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101462, unacked->seqno 101450:101462 
tcp_receive: removing 101450:101462 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
pbuf_remove_header: old 0xa0009f36 new 0xa0009f3d (7) 
pbuf_free(0xa0009eec) 
pbuf_free: deallocating 0xa0009eec 
pbuf_alloc(length=11) 
pbuf_alloc(length=11) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 65 
(index=1) 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa0009eec 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa0009eec (free desc=0) 
lpc_low_level_input: Packet received: 0xa000a508, size 92 (index=1) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 1) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa000b140 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa000b140 (free desc=0) 
lpc_low_level_input: Packet received: 0xa00098d0, size 66 (index=2) 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa000b75c 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa000b75c (free desc=0) 
lpc_low_level_input: Packet received: 0xa000ab24, size 69 (index=3) 
ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:90:1b:0e:ba:02:26, type:800 
pbuf_remove_header: old 0xa000a51c new 0xa000a52a (14) 
pbuf_free(0xa000a508) 
pbuf_free: deallocating 0xa000a508 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa00098e4 new 0xa00098f2 (14) 
pbuf_remove_header: old 0xa00098f2 new 0xa0009906 (20) 
pbuf_remove_header: old 0xa0009906 new 0xa000991a (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: duplicate seqno 215610 
pbuf_alloc(length=20) 
pbuf_alloc(length=20) == 0xa00097d8 
pbuf_add_header: old 0xa0009810 new 0xa00097fc (20) 
pbuf_add_header: old 0xa00097fc new 0xa00097ee (14) 
ethernet_output: sending packet 0xa00097d8 
lpc_low_level_output: pbuf packet(0xa00097ee) sent, chain#=0, size = 54 
(index=2) 
pbuf_free(0xa00097d8) 
pbuf_free: 0xa00097d8 has ref 1, ending here. 
pbuf_free(0xa00098d0) 
pbuf_free: deallocating 0xa00098d0 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa000ab38 new 0xa000ab46 (14) 
pbuf_remove_header: old 0xa000ab46 new 0xa000ab5a (20) 
pbuf_remove_header: old 0xa000ab5a new 0xa000ab6e (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101473, unacked->seqno 101462:101473 
tcp_receive: removing 101462:101473 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
lpc_tx_reclaim_st: Freeing packet 0xa00097d8 (index 2) 
pbuf_free(0xa00097d8) 
pbuf_free: deallocating 0xa00097d8 
pbuf_remove_header: old 0xa000ab6e new 0xa000ab75 (7) 
pbuf_free(0xa000ab24) 
pbuf_free: deallocating 0xa000ab24 
pbuf_alloc(length=12) 
pbuf_alloc(length=12) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 66 
(index=3) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 3) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa00097d8 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa00097d8 (free desc=0) 
lpc_low_level_input: Packet received: 0xa00091bc, size 66 (index=0) 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa00091d0 new 0xa00091de (14) 
pbuf_remove_header: old 0xa00091de new 0xa00091f2 (20) 
pbuf_remove_header: old 0xa00091f2 new 0xa0009206 (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101485, unacked->seqno 101473:101485 
tcp_receive: removing 101473:101485 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
pbuf_remove_header: old 0xa0009206 new 0xa000920d (7) 
pbuf_free(0xa00091bc) 
pbuf_free: deallocating 0xa00091bc 
pbuf_alloc(length=17) 
pbuf_alloc(length=17) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 71 
(index=0) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 0) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa000a508 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa000a508 (free desc=0) 
lpc_low_level_input: Packet received: 0xa0009eec, size 66 (index=1) 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa0009f00 new 0xa0009f0e (14) 
pbuf_remove_header: old 0xa0009f0e new 0xa0009f22 (20) 
pbuf_remove_header: old 0xa0009f22 new 0xa0009f36 (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101502, unacked->seqno 101485:101502 
tcp_receive: removing 101485:101502 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
pbuf_remove_header: old 0xa0009f36 new 0xa0009f3d (7) 
pbuf_free(0xa0009eec) 
pbuf_free: deallocating 0xa0009eec 
pbuf_alloc(length=17) 
pbuf_alloc(length=17) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 71 
(index=1) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 1) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa0009df4 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa0009df4 (free desc=0) 
lpc_low_level_input: Packet received: 0xa000b140, size 66 (index=2) 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa000b154 new 0xa000b162 (14) 
pbuf_remove_header: old 0xa000b162 new 0xa000b176 (20) 
pbuf_remove_header: old 0xa000b176 new 0xa000b18a (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101519, unacked->seqno 101502:101519 
tcp_receive: removing 101502:101519 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
pbuf_remove_header: old 0xa000b18a new 0xa000b191 (7) 
pbuf_free(0xa000b140) 
pbuf_free: deallocating 0xa000b140 
pbuf_alloc(length=17) 
pbuf_alloc(length=17) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 71 
(index=2) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 2) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa000ab24 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa000ab24 (free desc=0) 
lpc_low_level_input: Packet received: 0xa000b75c, size 66 (index=3) 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa000b770 new 0xa000b77e (14) 
pbuf_remove_header: old 0xa000b77e new 0xa000b792 (20) 
pbuf_remove_header: old 0xa000b792 new 0xa000b7a6 (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
tcp_receive: ACK for 101536, unacked->seqno 101519:101536 
tcp_receive: removing 101519:101536 from pcb->unacked 
pbuf_free(0xa000915c) 
pbuf_free: deallocating 0xa000915c 
pbuf_remove_header: old 0xa000b7a6 new 0xa000b7ad (7) 
pbuf_free(0xa000b75c) 
pbuf_free: deallocating 0xa000b75c 
pbuf_alloc(length=249) 
pbuf_alloc(length=249) == 0xa000915c 
pbuf_add_header: old 0xa00091a8 new 0xa0009194 (20) 
pbuf_add_header: old 0xa0009194 new 0xa0009180 (20) 
pbuf_add_header: old 0xa0009180 new 0xa0009172 (14) 
ethernet_output: sending packet 0xa000915c 
lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 303 
(index=3) 
lpc_tx_reclaim_st: Freeing packet 0xa000915c (index 3) 
pbuf_free(0xa000915c) 
pbuf_free: 0xa000915c has ref 1, ending here. 
pbuf_alloc(length=1536) 
pbuf_alloc(length=1536) == 0xa000b140 
lpc_rxqueue_pbuf: pbuf packet queued: 0xa000b140 (free desc=0) 
lpc_low_level_input: Packet received: 0xa00097d8, size 66 (index=0) 
ethernet_input: dest:24:ea:40:10:10:38, src:00:1b:1b:13:4c:fe, type:800 
pbuf_remove_header: old 0xa00097ec new 0xa00097fa (14) 
pbuf_remove_header: old 0xa00097fa new 0xa000980e (20) 
pbuf_remove_header: old 0xa000980e new 0xa0009822 (20) 
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags -+-+-+-+-+-+-+-+-+-+-+-+-+-+ 

Above is the debug trace from the lwip2.1.0 stack with freertos which shows 
the seqno 101450:101462 received by the stack and a response is outputed 
with lpc_low_level_output: pbuf packet(0xa0009172) sent, chain#=0, size = 65 
(index=1) but doesnot showed up in the Wireshark and the receiver and 
causing the client to retransmit the request as shown in the attached 
Wireshark trace.I am confused why is it happening if someone can have a look 
and explain it thanks 



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