[Bug 2067889] Re: DPDK 23.11.1 / OVS 3.3.0 cause test failures

[Christian Ehrhardt ]

Directly running just the failing test (of the 6 I picked the MTU upper
bound that I analyzed above) works like this:

# WIP

apt install ubuntu-dev-tools conntrack curl devscripts dpdk-dev ethtool equivs net-tools ncat python3-pyftpdlib tcpdump wget
apt-get remove --yes --purge netcat-openbsd
ln -sf /usr/bin/ncat /usr/bin/nc
pull-lp-source openvswitch
cd openvswitch-3.3.0/
mk-build-deps --install --tool "apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends --yes" --remove debian/control
./debian/rules build
systemctl stop openvswitch-ipsec ovs-vswitchd ovsdb-server
./tests/system-dpdk-testsuite -C _debian/tests -j1 AUTOTEST_PATH="$(pwd)/tests:$(pwd)/_debian/tests" 20

# Warning
While it seems to mostly work these steps are yet incomplete, it fails even with the good version unable to start the vhost-user client successfully. I'll update it once I find more, maybe Fnordahl knows more about OVS tests.

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https://bugs.launchpad.net/bugs/2067889

Title:
  DPDK 23.11.1 / OVS 3.3.0 cause test failures

Status in dpdk package in Ubuntu:
  New
Status in openvswitch package in Ubuntu:
  New

Bug description:
  https://autopkgtest.ubuntu.com/packages/o/openvswitch/oracular/amd64

  Bad
  Oracular OVS test with DPDK 23.11.1-1
  https://autopkgtest.ubuntu.com/results/autopkgtest-oracular/oracular/amd64/o/openvswitch/20240531_100906_6f957@/log.gz

  Good
  Oracular OVS test with DPDK 23.11-1
  https://autopkgtest.ubuntu.com/results/autopkgtest-oracular/oracular/amd64/o/openvswitch/20240529_111623_6f8db@/log.gz

  The logs are messy to read if not used to it, this is a try at debugging what is going wrong.
  So far it seems other people have retried 14 times, and 14714 fail at the same tests - I think there is a real issue.

  As shown below, one can find always these fail:
  4: OVS-DPDK - ping vhost-user ports                FAILED (system-dpdk.at:148)
  5: OVS-DPDK - ping vhost-user-client ports         FAILED (system-dpdk.at:224)
  16: OVS-DPDK - MTU increase vport port              FAILED (system-dpdk.at:609)
  17: OVS-DPDK - MTU decrease vport port              FAILED (system-dpdk.at:651)
  20: OVS-DPDK - MTU upper bound vport port           FAILED (system-dpdk.at:767)
  21: OVS-DPDK - MTU lower bound vport port           FAILED (system-dpdk.at:809)

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