[Bug 1942375] [NEW] test failure with some network configurations

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Dan Bungert (dbungert):

vip-manager behavior_test can fail, depending on the device network
configuration.  If the test device has a network device of type ether
and a zero hardware address, and it selects this network device as the
one to use, the tests will fail.

Example failure:

https://autopkgtest.ubuntu.com/results/autopkgtest-
impish/impish/armhf/v/vip-manager/20210901_213607_5779b@/log.gz

2021/09/01 21:35:37 Problems with generating the virtual ip manager: Cannot run vip-manager on the loopback device
as its hardware address is the local address (00:00:00:00:00:00),
which prohibits sending of gratuitous ARP messages

Here is abbreviated output of 'ip link show' for one such test device:

3: gretap0 at NONE: <BROADCAST,MULTICAST> mtu 1476 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
44262: eth0 at if44263: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1458 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 00:16:3e:0f:a3:f7 brd ff:ff:ff:ff:ff:ff link-netnsid 0

In this example, gretap0 will be the chosen network device, but will
fail at runtime of vip-manager due to the all-zeros mac address.
Instead, eth0 should be chosen.

** Affects: vip-manager (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: vip-manager (Debian)
     Importance: Unknown
         Status: Unknown

-- 
test failure with some network configurations
https://bugs.launchpad.net/bugs/1942375
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