ubuntu_fan_smoke_test failed on 4.4/4.15/4.18 kvm & azure kernel

[Po-Hsu Lin]

The "enable disable fan test" will fail with Xenial KVM kernel

Error message:
  RTNETLINK answers: Operation not supported
  /usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev ens4 dstport 0 local 10.246.72.56 fan-map 250.0.0.0/8:10.246.0.0/16
  /usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
  RTNETLINK answers: Cannot assign requested address
  iptables v1.6.0: Couldn't load target `fan-egress':No such file or directory

  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

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-1021-kvm 4.4.0-1021.26
ProcVersionSignature: User Name 4.4.0-1021.26-kvm 4.4.117
Uname: Linux 4.4.0-1021-kvm x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Thu Apr 12 10:22:57 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-kvm
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1763323

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Po-Hsu Lin (cypressyew)]

Can be found on 4.15 kvm as well.

[Sean Feole (sfeole)]

Hi Sam, is this still an issue?
+60 day bug with no action on it, marking bug as incomplete and will
close in 5 days if no update.

[Po-Hsu Lin (cypressyew)]

Still failing for the latest KVM kernel - 4.15.0-1021.21-kvm

http://10.246.72.4/test-results/4.15.0-1021.21-kvm/bionic-linux-kvm-kvm-4.15.0-groucho-ubuntu_quota_smoke_test/ubuntu_quota_smoke_test/results/ubuntu_quota_smoke_test.quota-smoke-test/debug/ubuntu_quota_smoke_test.quota-smoke-test.DEBUG.html

[Po-Hsu Lin (cypressyew)]

Discussed with smb and jvosburgh, this issue is similar to bug 1570565, some configs are missing for the KVM kernel.

$ grep -e VXLAN -e IPIP ubuntu-*-kvm/debian.kvm/config/config.common.ubuntu
ubuntu-bionic-kvm/debian.kvm/config/config.common.ubuntu:# CONFIG_NET_IPIP is not set
ubuntu-bionic-kvm/debian.kvm/config/config.common.ubuntu:# CONFIG_VXLAN is not set

ubuntu-xenial-kvm/debian.kvm/config/config.common.ubuntu:CONFIG_NET_IPIP=y
ubuntu-xenial-kvm/debian.kvm/config/config.common.ubuntu:# CONFIG_VXLAN is not set

The fan tunneling uses IPIP or VXLAN, if both of these config were disabled, then this fan stuff is not expected to work and the test should be disabled on the KVM kernel.

But the IPIP was enabled on Xenial KVM kernel, we will need to discuss this.

[Po-Hsu Lin (cypressyew)]

Spotted on Cosmic KVM as well.

[Po-Hsu Lin (cypressyew)]

Test disabled in ACT for KVM kernels https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=be027ae34aa565fb640697b56d862fb087a0ad0b

[Po-Hsu Lin (cypressyew)]

For comment #6, CONFIG_NET_IPIP has been enabled for all KVM kernels:
$ grep -e IPIP ubuntu-kvm-*/debian.kvm/config/config.common.ubuntu
ubuntu-kvm-bionic/debian.kvm/config/config.common.ubuntu:CONFIG_NET_IPIP=y
ubuntu-kvm-cosmic/debian.kvm/config/config.common.ubuntu:CONFIG_NET_IPIP=y
ubuntu-kvm-disco/debian.kvm/config/config.common.ubuntu:CONFIG_NET_IPIP=y
ubuntu-kvm-xenial/debian.kvm/config/config.common.ubuntu:CONFIG_NET_IPIP=y

As per discussion with Kamal:
    Disable the test case, on the grounds that "fan is not supported" in linux-kvm (until the fan folks or a customer asks for it to be supported).

Therefore I will mark this as Won't fix for KVM kernels.

[Po-Hsu Lin (cypressyew)]

This test has passed with Azure kernels (example output for 4.18.0-1019.19~18.04.1 Azure):
ubuntu_fan:0051|
ubuntu_fan:0051| Testing Fan Networking (pre-0.13.0 API)
ubuntu_fan:0051| docker pull ubuntu: PASSED
ubuntu_fan:0051| enable disable fan test: PASSED
ubuntu_fan:0051| fanctl show test: PASSED
ubuntu_fan:0051| fanctl check bridge config test: PASSED
ubuntu_fan:0051| fanatic docker test(--dns=168.63.129.16): PASSED