[COPYGC/MARKSWEEP]: Source Academy randomly crashes

[Anonymxtrix]

Expected Behavior

Source Academy playground should be running smoothly.

Current Behavior

Currently, while using the copy_gc and mark_sweep modules, Source Academy randomly crashes.

Failure Information (for bugs)

Please help provide information about the failure if this is a bug. If it is not a bug, please remove the rest of this template.

Steps to Reproduce

Please provide detailed steps for reproducing the issue.

1. Fetch the master branch from this remote.
2. Checkout violin/modules/master to a new branch.
3. Build and serve the modules using yarn build and yarn serve.
4. Play around in playground until you encounter the error.

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

• Version used: f9997c3
• Browser Name and version: Chrome/89.0.4389.90
• Operating System and version (desktop or mobile): Windows 10 Home version 1909

Failure Logs