Package: ifupdown
Version: 0.7.40
The network-interfaces.conf upstart script goes out of its way to make
sure basic loopback is up in pre-start:
if [ "$INTERFACE" = lo ]; then
# bring this up even if /etc/network/interfaces is broken
ifconfig lo 127.0.0.1 up || true
But if the subsequent ifup later in pre-start fails:
exec ifup --allow auto $INTERFACE
then upstart will run the post-stop stanza:
post-stop exec ifdown --allow auto $INTERFACE
which doesn't check for lo and ends up tearing down even the basic
loopback.
Suggested fix: Either skip ifdown if $INTERFACE=lo, or, to make sure
any non-basic loopback is ifdown-ed, run the ifdown and then ifconfig
back up the basic loopback.
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