[Bug 2147468] Re: Broken test "Unsupported protocol message" hangs indefiniently

[Matthew Ruffell]

Please write a SRU Template for this bug, since this is destined for
stable releases.

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https://bugs.launchpad.net/bugs/2147468

Title:
  Broken test "Unsupported protocol message" hangs indefiniently

Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Resolute:
  In Progress

Bug description:
  The test named "Unsupported protocol message" hangs indefinitely.

  There appears to be at least two issues with the test:
  1. nc --sh-exec forks, and child processes are kept around while processing request and not cleaned up by test suite macros.

  2. There appears to be bashisms in the test:

  ++ ip netns exec ls2p1 sh
  sh: 1: Syntax error: redirection unexpected

  Possible approaches could be to expand testsuite macros to handle
  children of processes on cleanup, or finding a different mechanism for
  receiving the UDP stream in the test.

  The issue was introduced by https://github.com/ovn-
  org/ovn/commit/985551d482694e39d51ed290a4607f71e5b65be8

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