2003631 - web pages sometimes not painted but accessible with inspector, context menu and Ctrl+A and Ctrl+C, tab shown as empty/blank

Status: NEW

(Core :: Web Painting, defect)

Description

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Observed twice today and once in the last week with Firefox 147.0a1 on Windows 10.

A web page is requested and the tab loading animation shown but the content area remains a blank grey area. Right click at a point and 'Select' called finds an element in the inspector, similar with Ctrl+A and Ctrl+C.

Today both tabs were for crash-stats.mozilla.org (latest one). While the earlier occurrence today eventually showed the content after several resizing and reload attempts (unknown what resolved, maybe a focus change), the latest one was only shown in the original tab when the same url got loaded in a new tab.

Comment 1

[Timothy Nikkel (:tnikkel)]

Hmm, the first thing that comes to mind is the work that Emilio has done recently reworking how paint happens.

Comment 2

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Observed again, this time with https://moderator.mozilla.org/

It's possible all 4 occurrences applied to a situation when the tab just got opened with the requested url after a click with the mousewheel in a different tab. The Multi Account Containers extension is installed in case it's relevant.

Comment 3

[Timothy Nikkel (:tnikkel)]

Opening a new tab means that about:blank gets loaded first, so potentially bug 543435 could be involved.

Do you have any other extensions or changes to your configuration of Firefox?

Comment 4

[Timothy Nikkel (:tnikkel)]

You could potentially use the nightly before bug 543435 landed for a few days to see if it reproduces to narrow things down.

Comment 5

[Vincent Hilla [:vhilla]]

This sounds like bug 2003452

Comment 6

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:tnikkel, could you have a look please?

For more information, please visit BugBot documentation.

Comment 7

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

This turned more frequent this week with several occurrences per day for bug pages with Nightly.

Comment 8

[Jan Brasna [:janbrasna]]

Attachment: v154-zombie-zoom-print.mov

I managed to get Beta and Nightly of different versions into the same state on the same day basically opening some bugzilla links over the same spotty weak wifi, slowly reconnecting to a handful of equally weak wifi choices after waking up macOS from sleep and being faster than the network really connected… only to end up with this zombified viewport.

Reloading or opening different URLs had no impact, as well as trying reader mode or zooming, or changing color modes or element inspection in devtools etc… Print preview worked ^^

Minimizing, maximizing, moving between spaces, triggering exposé, rearranging windows/tiling/snapping eventually helps to get the content visible again.

There's one short profile of a subsequent load in that zombified tab: https://share.firefox.dev/4xOqbxh

Comment 9

[Jan Brasna [:janbrasna]]

Attachment: v154-zombie-devtools-sshot.mov

When I try to take a screenshot in that state, it works sometimes (sometimes not, or just either a crop or fullpage works; also tried when reader mode was enabled, for comparison).