This bug was fixed in the package iproute2 - 6.14.0-1ubuntu1
---------------
iproute2 (6.14.0-1ubuntu1) plucky; urgency=low
* Merge from Debian unstable. Remaining changes:
- Ubuntu Fan Support
* FAN: Bump IFLA_VXLAN_FAN_MAP to match the kernel. (LP: #2105484)
-- Ubuntu Merge-o-Matic <m...@ubuntu.com> Tue, 25 Mar 2025 15:20:15
+0000
** Changed in: iproute2 (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/2105484
Title:
Invalid "fan-map" in iproute2 JSON output
Status in iproute2 package in Ubuntu:
Fix Released
Status in linux package in Ubuntu:
Invalid
Status in netplan.io package in Ubuntu:
Invalid
Bug description:
The netplan.io autopkgtests started failing a while ago on Plucky VMs.
The armhf based containers are unaffected, pointing towards a kernel
issue.
Local reproducer: autopkgtest -U -B netplan.io --test-name=tunnels -s
-- qemu /data/autopkgtest-plucky-amd64.img
=> see the following failure:
======================================================================
ERROR: test_tunnel_vxlan (__main__.TestNetworkd.test_tunnel_vxlan)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/tmp/autopkgtest.oVutZW/tree/tests/integration/tunnels.py", line 281,
in test_tunnel_vxlan
json = self.iface_json('vx0')
File "/tmp/autopkgtest.oVutZW/tree/tests/integration/base.py", line 315, in
iface_json
json_dict = json.loads(out)
File "/usr/lib/python3.13/json/__init__.py", line 346, in loads
return _default_decoder.decode(s)
~~~~~~~~~~~~~~~~~~~~~~~^^^
File "/usr/lib/python3.13/json/decoder.py", line 345, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.13/json/decoder.py", line 361, in raw_decode
obj, end = self.scan_once(s, idx)
~~~~~~~~~~~~~~^^^^^^^^
json.decoder.JSONDecodeError: Expecting ',' delimiter: line 1 column 379
(char 378)
Digging deeper I found the offending JSON string to be this:
'[{"ifindex":165,"ifname":"vx0","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1450,"qdisc":"noqueue","operstate":"UNKNOWN","group":"default","txqlen":1000,"link_type":"ether","address":"ce:b7:0a:11:3e:75","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":"eth42","port_range":{"low":4000,"high":4200},"port":4567,"ttl":64,"df":"unset","ageing":100,"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":524280,"tso_max_segs":65535,"gro_max_size":65536,"gso_ipv4_max_size":65536,"gro_ipv4_max_size":65536,"addr_info":[{"family":"inet6","local":"fe80::ccb7:aff:fe11:3e75","prefixlen":64,"
scope":"link","protocol":"kernel_ll","valid_life_time":4294967295,"preferred_life_time":4294967295}]}]'
There seems to be an unrelated "fan-map" word in-between.
That Netplan autopkgtest does this to trigger the issue:
"""
network:
renderer: networkd
version: 2
tunnels:
vx0:
mode: vxlan
id: 1337
link: eth0
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:
eth0:
addresses: [10.10.10.42/24]
"""
$ netplan apply
$ ip -j -d a show dev vx0
If we pipe that previous output to "json_pp" we get:
$ ip -j -d a show dev vx0 | json_pp
, or } expected while parsing object/hash, at character offset 378 (before
"fan-map ,"local":"10...") at /usr/bin/json_pp line 59.
If we try to parse it in Python (as the Netplan tests do):
>>> input
'[{"ifindex":165,"ifname":"vx0","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1450,"qdisc":"noqueue","operstate":"UNKNOWN","group":"default","txqlen":1000,"link_type":"ether","address":"ce:b7:0a:11:3e:75","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":"eth42","port_range":{"low":4000,"high":4200},"port":4567,"ttl":64,"df":"unset","ageing":100,"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":524280,"tso_max_segs":65535,"gro_max_size":65536,"gso_ipv4_max_size":65536,"gro_ipv4_max_size":65536,"addr_info":[{"family":"inet6","local":"fe80::ccb7:aff:fe11:3e75","prefixlen":64,"
scope":"link","protocol":"kernel_ll","valid_life_time":4294967295,"preferred_life_time":4294967295}]}]'
>>> import json
>>> json.loads(input)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.12/json/__init__.py", line 346, in loads
return _default_decoder.decode(s)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/json/decoder.py", line 353, in raw_decode
obj, end = self.scan_once(s, idx)
^^^^^^^^^^^^^^^^^^^^^^
json.decoder.JSONDecodeError: Expecting ',' delimiter: line 1 column 379
(char 378)
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