When testing on a loaded server, a socket hang up in a loop causes the whole test to hang

[aduchate]

The problem seems to happen in engine_utils.js within:

return function aLoop(context, callback) {
    let i = from;
    let newContext = context;
    let loopIndexVar = (opts && opts.loopValue) || '$loopCount';

    newContext.vars[loopIndexVar] = i;
    A.whilst(
      function test() {
        return i < to || to === -1;
      },
      function repeated(cb) {
        let zero = function(cb2) {
          return cb2(null, newContext);
        };
        let steps2 = L.flatten([zero, steps]);
        A.waterfall(steps2, function(err, context2) {
          i++;
          newContext = context2;
	  newContext.vars[loopIndexVar]++;
	  return cb(err, context2);
        });
      },
      function(err, finalContext) {
        return callback(err, finalContext);
      });
  };

where function(err, context2) {...} is called with a null context and err set to Error: socket hang up and newContext.vars triggers an exception

[aduchate]

Inserting if (!context2) return cb(err, context2); before newContext = context2;improves the behaviour. But I am not sure about what it implies in terms of loopIndexVar increment.

[hassy]

thanks @aduchate

[hassy]

Fixed in artilleryio/artillery-core#138