Test Udev (legacy test G6) fails (when interface has multiple IPv6 addresses)

[ogayot]

Hello,

I am trying to address various autopkgtest failures in Ubuntu.
Currently, legacy test G6 (from test-udev.py) is consistently failing in our test infrastructure. When running the test locally (i.e., meson test -C build), it succeeds if I only have one IPv6 address but it fails if two addresses are configured on a specific interface

======================================================================
FAIL: test__cid_matches_tid (test-udev.Test.test__cid_matches_tid)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest.2Tar77/autopkgtest_tmp/test/test-udev.py", line 693, in test__cid_matches_tid
    self.assertEqual(
AssertionError: False != True : Legacy Test Case G6 failed

I added some debug logs before the failing call to self.assertEqual:

match is False
ipv6_addrs is ['2001:xxx:1xx0:8xx7::axc:cxx2', 'fe80::18b8:409b:9be:4db7']
get_ipaddress_obj is 2001:xxx:1xx0:8xx7::axc:cxx2
tid = (tcp, FE80::aaaa:BBBB:cccc:dddd, 8009, hello, 2001:xxx:1xx0:8xx7::axc:cxx2)
cid_legacy = {'transport': 'tcp', 'traddr': 'FE80::aaaa:BBBB:cccc:dddd', 'trsvcid': '8009', 'subsysnqn': 'hello', 'host-traddr': '', 'host-iface': 'tun0', 'src-addr': '', 'host-nqn': ''}
ifaces = {'lo': {4: [IPv4Address('127.0.0.1')], 6: [IPv6Address('::1')]},
    'wallgarden0': {4: [IPv4Address('172.16.90.1')], 6: []},
    'mpqemubr0': {4: [IPv4Address('10.164.167.1')], 6: []},
    'lxdbr0': {4: [IPv4Address('172.16.82.1')], 6: [IPv6Address('fe80::216:3eff:fe0d:f967')]},
    'wg0': {4: [IPv4Address('10.8.3.10')], 6: [IPv6Address('fe80::db90:ce2:8e5f:670b')]},
    'dock0': {4: [IPv4Address('192.168.80.13')], 6: [IPv6Address('fe80::4a2a:e3ff:fe5b:d32f')]},
    'tun0': {4: [IPv4Address('10.172.194.130')], 6: [IPv6Address('2001:xxx:1xx0:8xx7::axc:cxx2'), IPv6Address('fe80::18b8:409b:9be:4db7')]}}
_cid_matches_tid = True

I am not sure what the tests exactly does. Is this an expected failure? I'm running on a Ubuntu 23.10 host with udev version 253.5.

Thanks,
Olivier

[martin-belanger]

@ogayot - Thanks for reporting this issue Olivier. I was able to reproduce it by assigning a second IPv6 address to one of the interfaces. Let me try to figure out what the problem is, and I'll push a fix as soon as possible.

[martin-belanger]

Fixed by #405