Comment 15 for bug 1010045

Resolvconf seems to be causing the "hang" in at least one of my testcases. It seems to be attempting to speak with our ldap authentication servers. Strace shows it is trying to lookup the hostnames of the auth servers and the connect to them multiple times for every interface, making the shutdown process take a very long time.

26880 ? S 0:00 /bin/sh -ex /etc/rc6.d/S02networking stop
26891 ? S 0:00 ifdown -v -a --exclude=lo
26939 ? S 0:00 /bin/sh -c run-parts --verbose /etc/network/if-down.d
26940 ? S 0:00 run-parts --verbose /etc/network/if-down.d
26953 ? S 0:00 /bin/sh /etc/network/if-down.d/resolvconf
26954 ? S 0:00 /bin/sh /sbin/resolvconf -d brvlan1000.inet

# strace -p 26954
Process 26954 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5
connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("172.31.17.6")}, 16) = 0
poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
sendto(5, "\206\33\1\0\0\1\0\0\0\0\0\0\5auth2\6cncore\3lan\6cn"..., 45, MSG_NOSIGNAL, NULL, 0) = 45
poll([{fd=5, events=POLLIN}], 1, 5000) = 0 (Timeout)
poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
sendto(4, "\206\33\1\0\0\1\0\0\0\0\0\0\5auth2\6cncore\3lan\6cn"..., 45, MSG_NOSIGNAL, NULL, 0) = 45
poll([{fd=4, events=POLLIN}], 1, 5000) = 0 (Timeout)
poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}])
sendto(5, "\206\33\1\0\0\1\0\0\0\0\0\0\5auth2\6cncore\3lan\6cn"..., 45, MSG_NOSIGNAL, NULL, 0) = 45
poll([{fd=5, events=POLLIN}], 1, 5000) = 0 (Timeout)
close(4) = 0
close(5) = 0
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=215, ...}) = 0
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