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    • Kristian Nielsen's avatar
      MDEV-7189: main.processlist fails sporadically in buildbot · 00649525
      Kristian Nielsen authored
      The test case tried to trigger a DEBUG_SYNC point at the end of a SELECT
      SLEEP(5) statement. It did this by using EXECUTE 2, intending to trigger first
      at the end of SET DEBUG_SYNC, and second at the end of the SELECT SLEEP(5).
      
      However, in --ps-protocol mode, this does not work, because the SELECT is
      executed in two steps (Prepare followed by Execute). Thus, the DEBUG_SYNC got
      triggered too early, during the Prepare stage rather than Execute, and the
      test case could race and information_schema.processlist see the thread in the
      wrong state.
      
      This patch fixes by changing the way the DEBUG_SYNC point is triggered. Now we
      add a DBUG injection inside the code for SLEEP(5). This ensures that the
      DEBUG_SYNC point is not activated until the SLEEP(5) is running, ensuring
      that the following wait for completion will be effective.
      00649525
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