# EventEmitter memory leak detected

**URL:** <https://discuss.emberjs.com/t/eventemitter-memory-leak-detected/10896>\
**Category:** Uncategorized\
**Created:** [June 9, 2016, 6:18pm UTC](https://discuss.emberjs.com/t/eventemitter-memory-leak-detected/10896 "2016-06-09T18:18:12Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![accelerate](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/accelerate/32/11324_2.png) [@accelerate](https://discuss.emberjs.com/u/accelerate)\
**Post date:** [June 9, 2016, 6:18pm UTC](https://discuss.emberjs.com/t/eventemitter-memory-leak-detected/10896/1 "2016-06-09T18:18:12Z")

</div>

Whenever I start Ember, I get an EventEmitter memory leak. It doesn’t seem to affect anything, but I’m wondering if there’s something I can do to get rid of the error

```
% ember serve
(node) warning: possible EventEmitter memory leak detected. 11 exit listeners added. Use emitter.setMaxListeners() to increase limit.
Trace
    at process.addListener (events.js:239:17)
    at Object.<anonymous> (/Users/denchen/dev/ops-ui/node_modules/ember-cli-babel/node_modules/broccoli-babel-transpiler/node_modules/broccoli-merge-trees/node_modules/can-symlink/node_modules/tmp/lib/tmp.js:449:9)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/Users/denchen/dev/ops-ui/node_modules/ember-cli-babel/node_modules/broccoli-babel-transpiler/node_modules/broccoli-merge-trees/node_modules/can-symlink/index.js:1:73)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
   at Object.<anonymous> (/Users/denchen/dev/ops-ui/node_modules/ember-cli-babel/node_modules/broccoli-babel-transpiler/node_modules/broccoli-merge-trees/index.js:9:18) 
Environment: development
Livereload server on http://localhost:49153
Serving on http://localhost:3000/

Build successful - 6821ms.

```

I’m seeing this issue on OSX with Node 4.4.5 as well as RedHat with Node 0.12. These are the possibly relevant packages (there are a bunch others, but I don’t think they have anything to do with the issue):

```
"broccoli-asset-rev": "^2.4.2",
"ember-cli": "2.5.0",
"ember-cli-app-version": "^1.0.0",
"ember-cli-babel": "^5.1.6",
"ember-cli-dependency-checker": "^1.2.0",
"ember-cli-release": "0.2.8",
"ember-data": "^2.5.0",
"ember-load-initializers": "^0.5.1",
"ember-resolver": "^2.0.3",
"loader.js": "^4.0.1"

```

I’m not even sure where to start looking to debug this issue.

---

<div class="post-metadata">

**Author:** ![heatbr](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/heatbr/32/9874_2.png) [@heatbr](https://discuss.emberjs.com/u/heatbr)\
**Post date:** [June 10, 2016, 5:30pm UTC](https://discuss.emberjs.com/t/eventemitter-memory-leak-detected/10896/2 "2016-06-10T17:30:29Z")

</div>

add a issue [Issues · emberjs/ember.js · GitHub](https://github.com/emberjs/ember.js/issues)

---

<div class="post-metadata">

**Author:** ![accelerate](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/accelerate/32/11324_2.png) [@accelerate](https://discuss.emberjs.com/u/accelerate)\
**Post date:** [June 16, 2016, 5:46pm UTC](https://discuss.emberjs.com/t/eventemitter-memory-leak-detected/10896/3 "2016-06-16T17:46:53Z")

</div>

This issue was discussed here: [https://github.com/babel/ember-cli-babel/issues/76#issuecomment-226306507](https://github.com/babel/ember-cli-babel/issues/76#issuecomment-226306507)

And subsequently fixed here: [https://github.com/ember-cli/ember-cli/pull/5987](https://github.com/ember-cli/ember-cli/pull/5987)

According to Stefan Penner, the fix should roll out into the next beta sometime next week.

---

<div class="post-metadata">

**Author:** ![ArunkumarK](https://avatars.discourse-cdn.com/v4/letter/a/6f9a4e/32.png) [@ArunkumarK](https://discuss.emberjs.com/u/ArunkumarK)\
**Post date:** [August 30, 2016, 6:05am UTC](https://discuss.emberjs.com/t/eventemitter-memory-leak-detected/10896/4 "2016-08-30T06:05:04Z")

</div>

For latest version NodeJS we need to add below line at very starting of your server file.

`require('events').EventEmitter.defaultMaxListeners = Infinity;`

For Older version

`require('events').EventEmitter.defaultMaxListeners = 0;`