The problem likely stems from this upstream change:
commit f8337efa4ff5a27e6c1d4e384166413eecd21a65
Author: Petr Machata <[email protected]>
Date: Tue Jun 17 00:44:19 2025 +0200
vxlan: Support MC routing in the underlay
which adds IFLA_VXLAN_MC_ROUTE to the vxlan flags.
On top of that
commit 33460140413ebb045df8de71774a1555abd3efde
Author: Jay Vosburgh <[email protected]>
Date: Wed May 1 14:34:00 2024 +0200
UBUNTU: SAUCE: fan: add VXLAN implementation
...
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -1399,6 +1399,7 @@ enum {
IFLA_VXLAN_LABEL_POLICY, /* IPv6 flow label policy;
ifla_vxlan_label_policy */
IFLA_VXLAN_RESERVED_BITS,
IFLA_VXLAN_MC_ROUTE,
+ IFLA_VXLAN_FAN_MAP = 35,
__IFLA_VXLAN_MAX
};
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
adds the flag for the fan map. Historically using a number high enough
to leave a gap. But since we expose the number via procfs there was no
gap in Plucky. We should adjust the fan patch to set no fix number and
just be appended to the set.
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https://bugs.launchpad.net/bugs/2124257
Title:
iproute2 breaking netplan DEP-8 tests in Questing, unexpected "fan-
map" in JSON output
Status in iproute2 package in Ubuntu:
Invalid
Status in linux package in Ubuntu:
Triaged
Status in netplan.io package in Ubuntu:
New
Status in iproute2 source package in Questing:
Invalid
Status in linux source package in Questing:
Triaged
Status in netplan.io source package in Questing:
New
Bug description:
iproute2 prints unexpected output about "fan-map" in the middle of its
JSON output.
Similar, but slightly different to bug #2115790
2430s test_tunnel_vxlan (__main__.TestNetworkd.test_tunnel_vxlan) ... eth42
vx0 ERROR
2438s test_tunnel_wireguard (__main__.TestNetworkd.test_tunnel_wireguard) ...
wg0 wg1 ok
2438s
2438s ======================================================================
2438s ERROR: test_tunnel_vxlan (__main__.TestNetworkd.test_tunnel_vxlan)
2438s ----------------------------------------------------------------------
2438s Traceback (most recent call last):
2438s File
"/tmp/autopkgtest.N7Mfst/build.7aq/src/tests/integration/tunnels.py", line 281,
in test_tunnel_vxlan
2438s json = self.iface_json('vx0')
2438s File
"/tmp/autopkgtest.N7Mfst/build.7aq/src/tests/integration/base.py", line 323, in
iface_json
2438s json_dict = json.loads(out)
2438s File "/usr/lib/python3.13/json/__init__.py", line 346, in loads
2438s return _default_decoder.decode(s)
2438s ~~~~~~~~~~~~~~~~~~~~~~~^^^
2438s File "/usr/lib/python3.13/json/decoder.py", line 345, in decode
2438s obj, end = self.raw_decode(s, idx=_w(s, 0).end())
2438s ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
2438s File "/usr/lib/python3.13/json/decoder.py", line 361, in raw_decode
2438s obj, end = self.scan_once(s, idx)
2438s ~~~~~~~~~~~~~~^^^^^^^^
2438s json.decoder.JSONDecodeError: Expecting ',' delimiter: line 1 column
379 (char 378)
2438s
2438s ----------------------------------------------------------------------
2438s Ran 26 tests in 295.714s
2438s
2438s FAILED (errors=1)
Reproducer:
$ autopkgtest-buildvm-ubuntu-cloud -r questing
$ autopkgtest -U netplan.io --test-name=tunnels -s --add-apt-source "deb-src
http://archive.ubuntu.com/ubuntu questing main"
--apt-pocket=proposed=src:iproute2 -- qemu ./autopkgtest-questing-amd64.img
inside the VM:
root@autopkgtest:~# cat /etc/netplan/tun.yaml
network:
renderer: networkd
version: 2
tunnels:
vx0:
mode: vxlan
id: 1337
link: ens3
local: 10.10.10.42
remote: 224.0.0.5 # multicast group
ttl: 64
aging: 100
port: 4567
port-range: [4000, 4200]
mac-learning: false
short-circuit: true
notifications: [l2-miss, l3-miss]
checksums: [udp, zero-udp6-tx, zero-udp6-rx, remote-tx, remote-rx] #
sd-networkd only
ethernets:
ens3:
dhcp4: true
root@autopkgtest:~# netplan apply
root@autopkgtest:~# ip -j -d a show dev vx0
[{"ifindex":146,"ifname":"vx0","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1450,"qdisc":"noqueue","operstate":"UNKNOWN","group":"default","txqlen":1000,"link_type":"ether","address":"de:85:01:51:96:fd","broadcast":"ff:ff:ff:ff:ff:ff","promiscuity":0,"allmulti":0,"min_mtu":68,"max_mtu":65535,"linkinfo":{"info_kind":"vxlan","info_data":{"id":1337,"group":"224.0.0.5"fan-map
,"local":"10.10.10.42","link":"ens3","port_range":{"low":4000,"high":4200},"port":4567,"ttl":64,"df":"unset","ageing":100,"reserved_bits":"0xf7ffffff000000ff","external":false,"learning":false,"proxy":false,"rsc":true,"l2miss":true,"l3miss":true,"udp_csum":true,"udp_zero_csum6_tx":true,"udp_zero_csum6_rx":true,"remcsum_tx":true,"remcsum_rx":true,"localbypass":true}},"num_tx_queues":1,"num_rx_queues":1,"gso_max_size":65536,"gso_max_segs":65535,"tso_max_size":65536,"tso_max_segs":65535,"gro_max_size":65536,"gso_ipv4_max_size":65536,"gro_ipv4_max_size":65536,"addr_info":[{"family":"inet6","local":"fe80::dc85:1ff:fe51:96fd","prefixlen":64,"scope":"link","protocol":"kernel_ll","valid_life_time":4294967295,"preferred_life_time":4294967295}]}]
This provides us with this broken JSON string:
"group":"224.0.0.5"fan-map,
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