[Bug 2127061] Re: [questing][linux-6.17][iproute2] regression causing system test failures

[Frode Nordahl]

There is a set of changes that go in hand both on kernel and userspace
side that for some reason triggers this issue.

Reverting either makes the test pass again.

Kernel      : 59f44c9ccc3b ("net: openvswitch: allow providing upcall pid for the 'execute' command")
Open vSwitch: 0d9dc8e9ca4a ("dpif-netlink: Provide original upcall pid in 'execute' commands.")

** Also affects: openvswitch (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  [questing][linux-6.17][iproute2] regression causing system test
  failures

Status in linux package in Ubuntu:
  New
Status in openvswitch package in Ubuntu:
  New
Status in ovn package in Ubuntu:
  New

Bug description:
  At this point in time, with the 6.17.0-5.5 kernel and iproute2
  6.16.0-1ubuntu2, the following OVN system tests fail on Questing:

      DNAT and SNAT on distributed router - N/S - IPv6
      Traffic to router port via LLA
      egress qos
      LR with SNAT fragmentation needed for external server

  Downgrading iproute2 to 6.14.0-1ubuntu1 makes the following tests
  pass:

      egress qos

  Mainline test with v6.16 and iproute2 6.14.0-1ubuntu1 makes all above
  mentioned tests work.

  Kernel/iproute2 from previous Ubuntu versions also make all above
  mentioned tests work.

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