Workers causing webpack infinite build loop

[Jarred-Sumner]

Bug report

Describe the bug

webpack or worker-loader is consistently going into an infinite build loop for me. I'm not sure why. I've spent a few hours investigating and so far, I think its related to workers because if I remove worker-loader, it builds successfully.

This happens on both Webpack v5 and Webpack v4, and Next.js canary, 9.5.2 , and 9.4.5.

There are no errors being shown, so its pretty difficult to debug :(

When running next dev with DEBUG=*, eventually the console prints this line until the next dev process OOMs:

If I remove the custom babel.config.js, it doesn't show that line anymore, but it still OOMs.

It seems like babel is building a file repeatedly. The code doesn't do anything like trying to import itself, so I'm not really sure why/how this can happen.

I tried adding lots of logging to worker-loader and that seems to be where its getting stuck. I see it rebuilding the same worker file. There's also a React Refresh boundary in the code for the worker, which makes me wonder if this is possibly related to #12753.

Is anyone else seeing an issue like this?

To Reproduce

I'm honestly not sure how I'd reproduce this yet :(

[Jarred-Sumner]

I switched the web worker-related code away from using Next.js and into a separate webpack config. I didn't make other code changes, and it works now

[balazsorban44]

This issue has been automatically locked due to no recent activity. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.