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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https://bugs.launchpad.net/bugs/1010045
Title:
12.04 hangs on shutdown deconfiguring network interfaces
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