My page loads frequently keep hanging forever when I enable offline content

[jespertheend]

Summary

Once every few page loads, the page just keeps hanging indefinitely. My fans start spinning like crazy and activity monitor reports a cpu of 100%.

URL

Any https://developer.mozilla.org/ url

Reproduction steps

1. Go to your profile settings and enable offline content
2. Visit https://developer.mozilla.org/

Expected behavior

The page loads

Actual behavior

It keeps hanging forever

Device

Desktop

Browser

Chrome

Browser version

Stable

Operating system

Mac OS

Screenshot

No response

Anything else?

No response

Validations

• I have read the Community Participation Guidelines.
• I have verified that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• I have checked that this is a concrete bug. For Q&A open a GitHub Discussion.

[jespertheend]

Restarting my browser fixes the issue but only temporarily. Disabling offline storage is the only real workaround.

I tried debugging this, but I think it might be a bug in Chrome, the await caches.match in the service worker never seems to resolve.

yari/client/pwa/src/fetcher.ts

Lines 45 to 48 in c61564a

	const r = await caches.match(e.request);
	if (r) {
	return r;
	}

[jespertheend]

I've opened up https://crbug.com/1409648

[Christopher-Hayes]

Same issue with offline storage in MDN running on Chrome. Seemed like offline data was not staying up-to-date. In the settings it said last update was Feb 22 (today is March 9th). I left the settings tab open since it said it was downloading and unpacking offline data. It got stuck at "100%" for unpacking. Refreshing the browser rendered MDN unusable (white screen, MDN would not load) for a period of 5 minutes or so. But, it appears to be working again and it's now saying the offline data is up-to-date.
Not sure if related to Chrome's new memory-saving feature that automatically sleeps tabs you haven't opened in a while.

[jespertheend]

I can’t imagine it being an intentional feature. In my case the hanging goes paired with high cpu load and a trace revealed it was performing a lot of database operations.