>Was libpcap configured to support IPv6?
>Is there an IPv6 host entry for "localhost"?
>What happens if you do
> tcpdump -i lo host localhost
>with a version of tcpdump linked with the same libpcap library? Does it
>crash?
>If so, what happens if you do
> tcpdump -d -O -i lo host localhost
>I think I've seen reports of crashes in "find_levels_r()" with a null
>argument before, and somebody just posted another one - but it doesn't
>happen on my non-IPv6-enabled system, so perhaps this only happens if
>"host" is checking both the IPv4 and IPv6 address.
i haven never seen the issue... i'd like to know how to repeat it.
tcpdump -d will also help us diagnose.
itojun
# ~/work/tcpdump/tcpdump/tcpdump -d -n -i lo0 host localhost
(000) ld [0]
(001) jeq #0x18000000 jt 2 jf 18
(002) ld [12]
(003) jeq #0x0 jt 4 jf 10
(004) ld [16]
(005) jeq #0x0 jt 6 jf 10
(006) ld [20]
(007) jeq #0x0 jt 8 jf 10
(008) ld [24]
(009) jeq #0x1 jt 23 jf 10
(010) ld [28]
(011) jeq #0x0 jt 12 jf 24
(012) ld [32]
(013) jeq #0x0 jt 14 jf 24
(014) ld [36]
(015) jeq #0x0 jt 16 jf 24
(016) ld [40]
(017) jeq #0x1 jt 23 jf 24
(018) jeq #0x2000000 jt 19 jf 24
(019) ld [16]
(020) jeq #0x7f000001 jt 23 jf 21
(021) ld [20]
(022) jeq #0x7f000001 jt 23 jf 24
(023) ret #96
(024) ret #0
# ~/work/tcpdump/tcpdump/tcpdump -n -i lo0 host localhost
tcpdump: listening on lo0
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