Memory leak regression after upgrading to `>= 6.3.0` about ember-intl

[ijlee2]

Hi, @johanrd. Thanks for posting recordings to show some of the steps that you had taken. From the videos, though, I didn't understand what I'm supposed to look at, which suggests that there is a memory leak. Can you describe this to me?

Secondly, I found the commit history hard to follow. Can you recreate the history so that each commit (each step) clearly indicates what's particular about that step?

At the moment, I have to doubt that ember-intl is the issue, because your reproduction repo includes a few other variables, such as ember-truth-helpers (in whose repo you had raised a similar issue), ember-resources, ember-template-imports (for *.gts), ember-route-template, and chart.js.

/* package.json */
{
  "dependencies": {
    "@ember/render-modifiers": "^2.1.0",
    "chart.js": "^4.4.2",
    "ember-intl": "^6.5.1",
    "ember-resources": "^7.0.0",
    "ember-route-template": "^1.0.3",
    "ember-truth-helpers": "^4.0.3",
    "reactiveweb": "^1.2.2"
  }
}

If you can write a reproduction app with the minimum necessary dependencies (don't include addons that are relatively unstable), I think it will help with your investigation more.

[johanrd]

@ijlee2 Hi. Thanks for the quick reply. Yes, the commit history is a mess – memory leaks are a mess.

Don't follow the commit history. Please follow my steps to reproduce

1. Clone https://github.com/johanrd/ember-memory-leak
2. Check out the ember-intl branch
3. Run pnpm start
4. Click on the "about' link.
5. Take a heap snapshot.
6. Search for "ChartJs". See that there are no such component in memory.
7. Visit the "dashboard" page and go back to "about" N times.
8. Take a new snapshot. See that the ChartJS component is retained in memory for each visit to dashboard, i.e. N times

9. Downgrade to ember-intl v6.2.2.
10. Repeat steps 1-7 and see that ChartJS component is successfully released from memory every time you exit the dashboard route.

Here, the only difference is the downgrade of ember-intl from v.6.3.0 to v6.2.2. One has a memory leak. The other does not. I can try to create an even more miniomal steps to reproduce (hence, the messy commit history), but at least there are steps to reproduce.

[johanrd]

Update: I have now stripped it down to a minimal reproducible example here: https://github.com/johanrd/ember-intl-memoy-leak-reproduction

Just search for LeakyIntlConsumingComponent in the heap memory, and it should be evident that the component (which is only consuming the t-helper) is not released from memory when it is destroyed.

Downgrade to ember-intl v6.2.2 and the memory leak is gone