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[Po-Hsu Lin <2031845@xxxxxxxxxxxxxxxxxx>]

On Mantic 6.5.0-1, this test is failing with "Error: Unsupported attribute." as well:
 Running './ubuntu_fan_smoke_test.sh 172.17.0.0/16'
 Testing Fan Networking (pre-0.13.0 API)
 docker pull --platform linux/amd64 ubuntu: PASSED
 Error: Unsupported attribute.
 /usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev docker0 dstport 0 local 172.17.0.1 fan-map 250.0.0.0/8:172.17.0.0/16
 /usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
 RTNETLINK answers: Cannot assign requested address
 iptables v1.8.7 (nf_tables): Chain 'fan-egress' does not exist
 Try `iptables -h' or 'iptables --help' for more information.
 iptables: Bad rule (does a matching rule exist in that chain?).
 iptables: Bad rule (does a matching rule exist in that chain?).
 iptables: No chain/target/match by that name.
 rm: cannot remove '/run/ubuntu-fan/nat-core': No such file or directory
 /usr/sbin/fanatic: unable to bring fan up, unable to configure 
 enable disable fan test: FAILED (fanatic enable-fan returned 1)

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https://bugs.launchpad.net/bugs/2031845

Title:
  ubuntu_fan_smoke_test failed with "Error: Unsupported attribute." on
  J-oem-6.5

Status in ubuntu-kernel-tests:
  New
Status in linux-oem-6.5 package in Ubuntu:
  Invalid
Status in ubuntu-fan package in Ubuntu:
  New
Status in linux-oem-6.5 source package in Jammy:
  New
Status in ubuntu-fan source package in Jammy:
  New

Bug description:
  Issue found with J-oem-6.5.0-1002

  The ubuntu_fan_smoke_test failed with:
      Error: Unsupported attribute.

  $ fanatic enable-fan -u 172.17.0.0/16 -o 250.0.0.0/8
  configuring fan underlay:172.17.0.0/16 overlay:250.0.0.0/8
  Error: Unsupported attribute.
  /usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev docker0 dstport 0 local 172.17.0.1 fan-map 250.0.0.0/8:172.17.0.0/16
  /usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
  RTNETLINK answers: Cannot assign requested address
  iptables v1.8.7 (nf_tables): Chain 'fan-egress' does not exist
  Try `iptables -h' or 'iptables --help' for more information.
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: No chain/target/match by that name.
  rm: cannot remove '/run/ubuntu-fan/nat-core': No such file or directory
  /usr/sbin/fanctl: /etc/network/fan:40 172.17.0.0/16 250.0.0.0/8  -- failed err=1
  /usr/sbin/fanatic: unable to bring fan up, unable to configure

  It is the ip command execute in fanctl script (called by fanatic) that trigger this "Error: Unsupported attribute." error:
  $ ip link add ftun0 type vxlan id 16384000 dev docker0 dstport 0 local 172.17.0.1 fan-map 250.0.0.0/8:172.17.0.0/16
  Error: Unsupported attribute.

  $ ip addr
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host 
         valid_lft forever preferred_lft forever
  2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8942 qdisc fq_codel state UP group default qlen 1000
      link/ether fa:16:3e:b9:7c:28 brd ff:ff:ff:ff:ff:ff
      altname enp0s3
      inet 10.134.252.19/24 metric 100 brd 10.134.252.255 scope global dynamic ens3
         valid_lft 33248sec preferred_lft 33248sec
      inet6 fe80::f816:3eff:feb9:7c28/64 scope link 
         valid_lft forever preferred_lft forever
  3: lxcbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
      link/ether 00:16:3e:00:00:00 brd ff:ff:ff:ff:ff:ff
      inet 10.0.3.1/24 brd 10.0.3.255 scope global lxcbr0
         valid_lft forever preferred_lft forever
  4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
      link/ether 02:42:52:9f:ef:1d brd ff:ff:ff:ff:ff:ff
      inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
         valid_lft forever preferred_lft forever

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