Package: ifupdown Version: 0.8.13ubuntu2 Severity: important Tags: patch ipv6
Dear Maintainer, Originally reported in Ubuntu bug 1629972 (http://pad.lv/1629972). stop of networking.service will bring down the link of the 'lo' interface. This causes problems. it does this whether or not there is a 'lo' entry in /etc/network/interfaces. For example: $ cat go.sh #!/bin/sh # clean out any state rm /run/network/ifstate* ip link set down dev lo ip link set down dev eth0 echo == all down ==; ip link show up echo == coming up ==; ifup -a echo == after up ==; ip link show up echo == going down ==; ifdown -a echo == after down ==; ip link show up That will show: == all down == == coming up == == after up == 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 == going down == == after down == The 'lo' link is taken down. As demonstrated https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1629972/comments/6 that actually breaks ipv6 networking. See attached suggested fix. -- System Information: Debian Release: stretch/sid APT prefers yakkety-updates APT policy: (500, 'yakkety-updates'), (500, 'yakkety-security'), (500, 'yakkety') Architecture: amd64 (x86_64) Kernel: Linux 4.8.0-22-generic (SMP w/4 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages ifupdown depends on: ii adduser 3.113+nmu3ubuntu4 ii init-system-helpers 1.45 ii iproute2 4.3.0-1ubuntu3 ii libc6 2.24-3ubuntu1 ii lsb-base 9.20160110ubuntu5 Versions of packages ifupdown recommends: ii isc-dhcp-client [dhcp-client] 4.3.3-5ubuntu15 Versions of packages ifupdown suggests: ii ppp 2.4.7-1+2ubuntu1 pn rdnssd <none> -- no debconf information
commit c25d5c6b832ffa9e93433862479ad7b7f632a674 Author: Scott Moser <smo...@brickies.net> Date: Thu Oct 13 16:21:10 2016 -0400 networking.service: exclude loopback device lo in ExecStop. Taking down the loopback device causes havoc on the system, such as issues with dbus or general ipv6 networking. The issue seen here was that ipv6 networking would stop functioning and the iscsi mount of root over that ipv6 would become unavailable. diff --git a/debian/networking.service b/debian/networking.service index 065c816..7d7af55 100644 --- a/debian/networking.service +++ b/debian/networking.service @@ -16,6 +16,6 @@ Type=oneshot EnvironmentFile=-/etc/default/networking ExecStartPre=-/bin/sh -c '[ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle' ExecStart=/sbin/ifup -a --read-environment -ExecStop=/sbin/ifdown -a --read-environment +ExecStop=/sbin/ifdown -a --read-environment --exclude=lo RemainAfterExit=true TimeoutStartSec=5min