Mysql server gone randomly after all Behat tests have run

I didn't experience that exact issue, but I have run into issues with modules that register shutdown functions. Since a Behat run can cover many many 'page loads' (as Drupal modules are typically thinking), by the time the shutdown functions are actually called, much of the underlying data (such as node objects) no longer exist. This code removes shutdown functions:

  /**
   * Register a shutdown function.
   *
   * We manually call shutdown functions, so register one to exit immediately.
   *
   * @BeforeSuite
   */
  public static function registerShutdownFunction() {
    register_shutdown_function('FeatureContext::shutdownFunction');
  }

  /**
   * The shutdown function to skip all others.
   */
  public static function shutdownFunction() {
    exit;
  }

Also available here: https://gist.github.com/jhedstrom/0c06cf2caca1cac0b517

Did you folks ever figure this one out?

Looks like this has been figured out: #2231631