[Bug 1072518] Re: Restart networking crashes dbus and the desktop manager

[Bryan Gonzalez]

At Simon McVittie's suggestion (from dbus @freedesktop.org) and reding
some of the comments from the bug duplicates of this bug. The general
thought is that the Upstart/Sysvinit conflict may lie at the root of
this issue. Since 2 Ubuntu LTS releases ago, the dev's decided to use
Upstart for the system init. Upstart is meant to be a complete
replacement for Sysvinit. In the interest of backwards compatibility,
the Upstart devs made some allowances so that people/packages still
using sysvinit-style init scripts could continue to do so. The
/etc/init.d/networking init script is written for sysvinit in such a way
that calling it uses sysvinit methods and breaks dbus which is written
for Upstart.

The solution here is to have the maintainer of the networking init
script fix/rewrite it so that it is Upstart compatible. This may mean
that the networking init script will lose compatibility with sysvinit,
but they need to get over it. Sysvinit is deprecated/obsolete and too
much effort is being wasted into maintaining it when the future is
Upstart. And especially because Ubuntu's official init is Upstart, it
would make sense to make it work with this package rather than a past
one.

Eventually, when sysvinit is long dead, there will be no need for init
scripts as Upstart does not need them, but fixing the current script is
a good place to start.

/etc/init.d/networking is contained within package initscripts which is
part of the sysvinit package which is maintained by the Ubuntu Core
Developers mailto:ubuntu-devel-discuss at lists.ubuntu.com

** Also affects: upstart (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1072518

Title:
  Restart networking crashes dbus and the desktop manager

Status in D-Bus:
  Confirmed
Status in “dbus” package in Ubuntu:
  Confirmed
Status in “sysvinit” package in Ubuntu:
  New
Status in “upstart” package in Ubuntu:
  New

Bug description:
  =========== WARNING ===============

  Doing:

  sudo restart networking

  or

  sudo /etc/init.d/networking restart.

  ============ WILL TEAR DOWN MOST OF YOUR DESKTOP =============

  Networking is a generic job which brings up all networking interfaces
  in the right order at boot.

  It should never be stopped nor restarted.

  It is only stop at shutdown to correctly bring down all the networking
  interfaces in the right order again.

  =========== DO NOT RESTART NETWORKING ===============

  If you want to reconfigure all networking interface you can use
  something like:

   ifdown eth0
   ifup eth0

  Or all interfaces with:

   ifdown -a --exclude=lo && ifup -a --exclude=lo

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