[Bug 2077157] Re: [oracular][s390x] ping6 between two ports with header modify fails for all datapaths

[Frode Nordahl]

I am able to reproduce the issue, and unfortunately there appears to be
nothing exciting about it, it is just an load induced intermittent
failure. Any apparent architecture specific nature is just random.

This patch appears to fix the issue:
diff --git a/tests/system-traffic.at b/tests/system-traffic.at
index 202ff0492..3c4fa68eb 100644
--- a/tests/system-traffic.at
+++ b/tests/system-traffic.at
@@ -253,6 +253,8 @@ priority=0,actions=NORMAL
 AT_CHECK([ovs-ofctl del-flows br0])
 AT_CHECK([ovs-ofctl add-flows br0 flows.txt])
 
+OVS_WAIT_UNTIL([ip netns exec at_ns1 ping6 -c 1 fc00::3])
+
 NS_CHECK_EXEC([at_ns0], [ping6 -q -c 3 -i 0.3 -W 2 fc00::3 | FORMAT_PING], [0], [dnl
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])

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https://bugs.launchpad.net/bugs/2077157

Title:
  [oracular][s390x] ping6 between two ports with header modify fails for
  all datapaths

Status in openvswitch package in Ubuntu:
  New

Bug description:
  Log excerpt:
  2217s #                             -*- compilation -*-
  2217s 9. system-traffic.at:229: testing datapath - ping6 between two ports with header modify ...
  ...
  2217s ping6 -q -c 3 -i 0.3 -W 2 fc00::3 | grep "transmitted" | sed 's/time.*ms$/time 0ms/'
  2217s NS_EXEC_HEREDOC
  2217s --- -	2024-08-16 06:31:50.902123272 +0000
  2217s +++ /tmp/autopkgtest.ruCUWN/build.pFg/src/_debian/tests/system-kmod-testsuite.dir/at-groups/9/stdout	2024-08-16 06:31:50.896703183 +0000
  2217s @@ -1,2 +1,2 @@
  2217s -3 packets transmitted, 3 received, 0% packet loss, time 0ms
  2217s +3 packets transmitted, 2 received, 33.3333% packet loss, time 0ms

  The test succeeds for other architectures.

  Full log: https://autopkgtest.ubuntu.com/results/autopkgtest-
  oracular/oracular/s390x/o/openvswitch/20240816_065455_5b95d@/log.gz

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