[Bug 1003656] Re: bridge-utils/vlan udev hooks prevent execution of upstart hook, slowing down boot

[andrew bezella]

looks good in my testing, too.  with bridge-utils 1.5-2ubuntu7 the
previously failing versions of my interfaces file work. our current live
version of the interfaces continues to work, and a variant w/o the "pre-
up" workaround from my initial report works as well.  thanks!

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Title:
  bridge-utils/vlan udev hooks prevent execution of upstart hook,
  slowing down boot

Status in “bridge-utils” package in Ubuntu:
  Fix Released
Status in “vlan” package in Ubuntu:
  Invalid
Status in “bridge-utils” source package in Precise:
  Fix Committed
Status in “bridge-utils” source package in Quantal:
  Fix Released
Status in “vlan” source package in Quantal:
  Invalid

Bug description:
  [rationale]
  With some specific configuration, the boot hangs for minutes in udev as ifupdown is waiting for an interface to show up.

  [test case]
   - Use one of the configurations listed in this bug or its duplicate, boot the machine with it and observe it hanging for a couple of minutes.
   - Apply the update
   - Check that the machine now works much faster and that the interface is properly configured.

  [regression potential]
  I can't see of a situation where someone would be depending on the broken behaviour which wouldn't in itself be a bug. The change landed fairly early in Ubuntu 12.10 and no regression has been reported so far. Worst case scenario, it's easy to revert.


  we're trying to migrate our network configuration from lucid to
  precise.  in 10.04 we tied eth0+eth1 together into bond0, then set br0
  up on top of that and assigned an address via dhcp.  in 12.04 this
  only works if br0 is configured with a static ip address.  it fails
  when trying to use dhcp.  to simplify testing i've removed eth1 from
  the configuration (sanity checked against
  http://www.stgraber.org/2012/01/04/networking-in-ubuntu-12-04-lts/ ):

  auto lo
  iface lo inet loopback

  auto eth0
  iface eth0 inet manual
    bond-master bond0

  auto bond0
  iface bond0 inet manual
    bond-slaves none
    bond-mode 802.3ad
    bond-miimon 100

  auto br0
  iface br0 inet dhcp
    bridge_ports bond0
    bridge_stp off

  the above results in a system w/o network connectivity.  the dhcp
  server reports requests from an unexpected mac addr (different each
  boot).  udevd logs "timeout 'bridge-network-interface'".  poking
  around a little before the timeout shows the following 2 groups of
  processes:

    |-ifup,1361 --allow auto eth0
    |   `-sh,1363 -c run-parts  /etc/network/if-pre-up.d
    |       `-run-parts,1364 /etc/network/if-pre-up.d
    |           `-ifenslave,1392 /etc/network/if-pre-up.d/ifenslave
    |               `-sleep,2380 0.1

    |   |-udevd,599 --daemon
    |   |   `-bridge-network-,1429 /lib/udev/bridge-network-interface
    |   |       `-ifup,1457 --allow auto br0
    |   |           `-sh,1540 -c dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.br0.pid -lf /var/lib/dhcp/dhclient.br0.leases -1 br0
    |   |               `-dhclient3,1541 -e IF_METRIC=100 -pf /var/run/dhclient.br0.pid -lf /var/lib/dhcp/dhclient.br0.leases -1 br0

  the ifenslave appears to be looping over that `sleep` (testing for
  /run/network/ifenslave.bond0) until it is killed and the dhclient is
  making its request w/the unexpected mac addr (also reported in `ip
  link show br0`).  interestingly br0's mac addr matches that of eth0
  (as expected) once bridge-network-interface has timed out and been
  killed.

  a workaround appears to be adding the line:
    pre-up /sbin/ifup --allow auto bond0
  to the "auto br0" stanza.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: bridge-utils 1.5-2ubuntu6
  ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  Date: Wed May 23 13:44:43 2012
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  SourcePackage: bridge-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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