Again, is that the root cause or a symptom of a former failure?
Not all tests are very clear in that regard, but one I liked.
As it fails BEFORE this cleanup phase.

The "MTU upper bound vport port" test is like this:

> 2024-05-31T10:08:28.364Z|00117|netdev_dpdk|WARN|dpdkvhostuserclient0: 
> unsupported MTU 9711
> 2024-05-31T10:08:28.364Z|00118|netdev|WARN|failed to set MTU for network 
> device dpdkvhostuserclient0: Invalid argument
> 2024-05-31T10:08:28.374Z|00119|bridge|INFO|bridge br10: deleted interface 
> dpdkvhostuserclient0 on port 1
> 2024-05-31T10:08:28.374Z|00120|dpif_netdev|INFO|PMD thread on numa_id: 0, 
> core id:  3 destroyed.
> 2024-05-31T10:08:28.374Z|00002|dpdk(pmd-c03/id:10)|INFO|PMD thread released 
> DPDK lcore 1.
> 2024-05-31T10:08:28.375Z|00121|dpdk|INFO|VHOST_CONFIG: 
> (/tmpdir/_debian/tests/system-dpdk-testsuite.dir/020/dpdkvhostclient0) free 
> connfd 52
> 2024-05-31T10:08:28.375Z|00122|netdev_dpdk|INFO|vHost Device 
> '/tmpdir/_debian/tests/system-dpdk-testsuite.dir/020/dpdkvhostclient0' not 
> found
tests/system-dpdk-testsuite: line 1754: 275858 Killed                  
dpdk-testpmd $eal_options -- $testpmd_options > testpmd.log 2>&1
20. system-dpdk.at:736: 20. OVS-DPDK - MTU upper bound vport port 
(system-dpdk.at:736): FAILED (system-dpdk.at:767)

But this is a red-herring, as the setting of this is meant to fail.
The test says:
  "Set MTU value above upper bound and check for error"

So it might indeed be the cleanup that fails?

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

Title:
  DPDK 23.11.1 / OVS 3.3.0 cause test failures

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