[Bug 273207] pf_syncookie_mac for IPv6 random cause panic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273207

--- Comment #15 from Rin Cat <dev@rincat.ch> ---
#11 0xffffffff82abac5a in pf_syncookie_mac (pd=pd@entry=0xfffffe00c5fc3b10,
cookie=..., seq=<optimized out>) at /usr/src/sys/netpfil/pf/pf_syncookies.c:444

(kgdb) p pd
$19 = (struct pf_pdesc *) 0xfffffe00c5fc3b10
(kgdb) p *pd
$20 = {lookup = {done = 0, uid = 0, gid = 0}, tot_len = 72, hdr = {tcp =
{th_sport = 47873, th_dport = 6321, th_seq = 3504939527, th_ack = 2232635287,
th_x2 = 0 '\000', th_off = 8 '\b', th_flags = 16 '\020', th_win = 9729, th_sum
= 49434, th_urp = 0}, udp = {
      uh_sport = 47873, uh_dport = 6321, uh_ulen = 8711, uh_sum = 53481}, icmp
= {icmp_type = 1 '\001', icmp_code = 187 '\273', icmp_cksum = 6321, icmp_hun =
{ih_pptr = 7 '\a', ih_gwaddr = {s_addr = 3504939527}, ih_idseq = {icd_id =
8711, icd_seq = 53481}, 
        ih_void = -790027769, ih_pmtu = {ipm_void = 8711, ipm_nextmtu = 53481},
ih_rtradv = {irt_num_addrs = 7 '\a', irt_wpa = 34 '"', irt_lifetime = 53481}},
icmp_dun = {id_ts = {its_otime = 2232635287, its_rtime = 637603968, its_ttime =
49434}, id_ip = {idi_ip = {
            ip_hl = 7 '\a', ip_v = 9 '\t', ip_tos = 79 'O', ip_len = 34067,
ip_id = 4224, ip_off = 9729, ip_ttl = 26 '\032', ip_p = 193 '\301', ip_sum = 0,
ip_src = {s_addr = 0}, ip_dst = {s_addr = 0}}}, id_radv = {ira_addr =
2232635287, ira_preference = 637603968}, 
        id_mask = 2232635287, id_data = "\227"}}, any = 0xfffffe00c5fc3b28
"\001\273\261\030\a\"\351ЗO\023\205\200\020\001&\032\301"}, nat_rule = 0x0, src
= 0xfffff801d35cc06e, dst = 0xfffff801d35cc07e, sport = 0x0, dport = 0x0,
pf_mtag = 0x0, act = {qid = 0, pqid = 0}, 
  p_len = 0, ip_sum = 0x0, proto_sum = 0x0, flags = 0, af = 28 '\034', proto =
6 '\006', tos = 0 '\000', dir = 1 '\001', sidx = 0 '\000', didx = 1 '\001'}
(kgdb) p pd->src
$21 = (struct pf_addr *) 0xfffff801d35cc06e
(kgdb) p *pd->src
$22 = {pfa = {v4 = {s_addr = 2969XXXXX}, v6 = {__u6_addr = {__u6_addr8 =
"&\a\370\260@\006\b XXXXX000\000\000\000 \n", __u6_addr16 = {XXXX, XXXXX, XXXX,
XXX, 0, 0, 0, XXXX}, __u6_addr32 = {XXXXXXXXXX, XXXXXXXX, XXXXXXXXXX,
XXXXXXXXX}}}, 
    addr8 = "&\a\370\260@\006\b \000\000\000\000\000\000 \n", addr16 =
{XXXXXXX, XXXXX, XXXX, XXXXX, XXXX, XXXX, XXXXX, XXXXXX}, addr32 = {XXXXXXX,
XXXXXX, XXXXXX, XXXXXXX}}}

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