Public bug reported:

The plucky autopkgtest currently fails[1] with:

4553s [  293.469711] systemd-networkd-tests.py[433]: 
======================================================================
4553s [  293.476355] systemd-networkd-tests.py[433]: FAIL: test_vxlan 
(__main__.NetworkdNetDevTests.test_vxlan)
4553s [  293.476792] systemd-networkd-tests.py[433]: 
----------------------------------------------------------------------
4553s [  293.477223] systemd-networkd-tests.py[433]: Traceback (most recent 
call last):
4553s [  293.477942] systemd-networkd-tests.py[433]:   File 
"/usr/lib/systemd/tests/testdata/test-network/systemd-networkd-tests.py", line 
3077, in test_vxlan
4553s [  293.479400] systemd-networkd-tests.py[433]:     self.assertIn('vxlan 
id 4831584 local 2002:da8:1:0:1034:56ff:fe78:9abc dev veth99', output)
4553s [  293.479778] systemd-networkd-tests.py[433]:     
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
4553s [  293.480275] systemd-networkd-tests.py[433]: AssertionError: 'vxlan id 
4831584 local 2002:da8:1:0:1034:56ff:fe78:9abc dev veth99' not found in '157: 
vxlan-slaac: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1430 qdisc noqueue state 
UNKNOWN mode DEFAULT group default qlen 1000\n    link/ether e6:3a:0a:ca:6b:da 
brd ff:ff:ff:ff:ff:ff promiscuity 0 allmulti 0 minmtu 68 maxmtu 65535 \n    
vxlan id 4831584 fan-map local 2002:da8:1:0:1034:56ff:fe78:9abc dev veth99 
srcport 0 0 dstport 8472 ttl auto ageing 300 noudp_csum numtxqueues 1 
numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 tso_max_size 524280 
tso_max_segs 65535 gro_max_size 65536 gso_ipv4_max_size 65536 gro_ipv4_max_size 
65536'
4553s [  293.483772] systemd-networkd-tests.py[433]: 
----------------------------------------------------------------------
4553s [  293.486415] systemd-networkd-tests.py[433]: Ran 44 tests in 270.410s
4553s [  293.486794] systemd-networkd-tests.py[433]: FAILED (failures=1, skipped

The key difference is the `fan-map` output added to `ip link`. This is a
regression introduced by src:linux and src:iproute2, reintroducing the
Ubuntu FAN patches[2].

[1] 
https://autopkgtest.ubuntu.com/results/autopkgtest-plucky/plucky/amd64/s/systemd/20250315_000531_48fe4@/log.gz
[2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2064508

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2104943

Title:
  systemd: autopkgtest regression due to ubuntu FAN kernel + iproute2
  patches

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