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

[Christian Ehrhardt ]

After the setup outlined above I was running the set the autopkgtest identified (4-5 16-17 20-21
). With that I was able to trigger good/bad case in a reproducible way.

In my repro-environment, test 5 also fails in the good case - which
might just be my test environment's fault. Hence I'm comparing 4 16-17
20-21 now and will attach the detailed test logs for them for the good
and bad case (which only differs in the DPDK version used 23.11 vs
23.11.1).

But the good case leaves no details of the execution in the log, hence
I'll also collect and attach the full output of _debian/tests/system-
dpdk-testsuite.dir which holds all these details.

Hopefully we find a pattern comparing the testcases one by one in these
...

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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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