v4 v6tcp各自注册了自己的ipv4_specific
ipv6_specific，都走到了v4的处理流程，怎么突然会调用v6的tcp_v6_conn_request，代码没看懂，请高手指点
(gdb) bt
#0 reqsk_queue_hash_req (timeout=750, req=0xc1270660, hash=12,
queue=0xcfafdb98) at include/net/request_sock.h:252
#1 inet_csk_reqsk_queue_hash_add (timeout=750, req=0xc1270660, hash=12,
queue=0xcfafdb98) at net/ipv4/inet_connection_sock.c:395
#2 0xc0755db6 in tcp_v4_conn_request (sk=0xcfafd9c0, skb=0xcfaf15c0)
at net/ipv4/tcp_ipv4.c:1393
#3 0xc07f76f9 in tcp_v6_conn_request (sk=0xcfafd9c0, skb=0xcfaf15c0)
at net/ipv6/tcp_ipv6.c:1243
#4 0xc074550d in tcp_rcv_state_process (sk=0xcfafd9c0, skb=0xcfaf15c0,
th=0xcfa55034, len=40) at net/ipv4/tcp_input.c:4422
#5 0xc0757022 in tcp_v4_do_rcv (sk=0xcfafd9c0, skb=0xcfaf15c0)
at net/ipv4/tcp_ipv4.c:1584
#6 0xc0757fc0 in tcp_v4_rcv (skb=0xcfaf15c0) at net/ipv4/tcp_ipv4.c:1683
#7 0xc071678b in ip_local_deliver_finish (skb=0xcfaf15c0)
at net/ipv4/ip_input.c:236
#8 ip_local_deliver (skb=0xcfaf15c0) at net/ipv4/ip_input.c:275
#9 0xc07175db in dst_input (skb=0xcfaf15c0) at include/net/dst.h:242
#10 ip_rcv_finish (skb=0xcfaf15c0) at net/ipv4/ip_input.c:363
#11 ip_rcv (skb=0xcfaf15c0) at net/ipv4/ip_input.c:434
#12 0xc06eab0e in netif_receive_skb (skb=0xcfaf15c0) at net/core/dev.c:1840
#13 0xc06eac56 in process_backlog (backlog_dev=0xc1205200, budget=0xc09f3df4)
at net/core/dev.c:1874
要停掉V6？