title: NodeJS : warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit
body: <p>I have the below code:</p>
  
  <pre><code>var schild = spawn('script.sh', ["process1", "process2"]);
          schild.stderr.on('data', function (data) {
                          logger.info('stderr: ' + data);
          });
  
          schild.on('exit', function (code) {
            logger.info('child process exited with code ' + code);
          });
  
          schild.stdout.on('data', function (data) {
             logger.info('Data ' + data);
          });
  </code></pre>
  
  <p>when I run the code I get below error:</p>
  
  <pre><code>(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
  Trace
      at EventEmitter.addListener (events.js:175:15)
      at EventEmitter.once (events.js:196:8)
      at Transport.logException (/x/home/prakash/src/node_modules/winston/lib/winston/transports/transport.js:118:8)
      at logAndWait (/x/home/prakash/src/node_modules/winston/lib/winston/logger.js:613:15)
      at async.forEach (/x/home/prakash/src/node_modules/winston/node_modules/async/lib/async.js:86:13)
      at Array.forEach (native)
      at _forEach (/x/home/prakash/src/node_modules/winston/node_modules/async/lib/async.js:26:24)
      at Object.async.forEach (/x/home/prakash/src/node_modules/winston/node_modules/async/lib/async.js:85:9)
      at Logger._uncaughtException (/x/home/prakash/src/node_modules/winston/lib/winston/logger.js:636:9)
      at process.EventEmitter.emit (events.js:126:20)
  (node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
  Trace
      at EventEmitter.addListener (events.js:175:15)
      at EventEmitter.once (events.js:196:8)
      at Transport.logException (/x/home/prakash/src/node_modules/winston/lib/winston/transports/transport.js:117:8)
      at logAndWait (/x/home/prakash/src/node_modules/winston/lib/winston/logger.js:613:15)
      at async.forEach (/x/home/prakash/src/node_modules/winston/node_modules/async/lib/async.js:86:13)
      at Array.forEach (native)
      at _forEach (/x/home/prakash/src/node_modules/winston/node_modules/async/lib/async.js:26:24)
      at Object.async.forEach (/x/home/prakash/src/node_modules/winston/node_modules/async/lib/async.js:85:9)
      at Logger._uncaughtException (/x/home/prakash/src/node_modules/winston/lib/winston/logger.js:636:9)
      at process.EventEmitter.emit (events.js:126:20)
  </code></pre>