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

[Stéphane Graber]

** Description changed:

+ [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
+   bond-master bond0
  
  auto bond0
  iface bond0 inet manual
-   bond-slaves none
-   bond-mode 802.3ad
-   bond-miimon 100
+   bond-slaves none
+   bond-mode 802.3ad
+   bond-miimon 100
  
  auto br0
  iface br0 inet dhcp
-   bridge_ports bond0 
-   bridge_stp off
+   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
+   |-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
+   |   |-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
+   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
+  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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https://bugs.launchpad.net/bugs/1003656

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

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