1653374 - sw-wr: black rectangles in upper right corner of page when scrolling

Status: VERIFIED FIXED

(Core :: Graphics: WebRender, defect, P3)

Description

[Chris Peterson [:cpeterson]]

Attachment: SW-WR_screenshot.png

Steps to reproduce

1. Set gfx.webrender.all and gfx.webrender.software = true.
2. Restart Nightly.
3. Load https://www.bungie.net/en/Explore/Detail/News/49340
4. Maximize the browser window to make the problem easier to see.
5. Slowly scroll down and up the page.

result

The upper right corner of the page is not rendered. It appears to be covered by black rectangles. See the attached screenshot.

Disabling gfx.webrender.software makes the problem go away.

I've seen this problem on other pages but not all.

I bisected the regression to this pushlog that points to bug 1650984:

https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=a05fbae74197b3e9e69f5e0003026451a82bf9cd&tochange=97f04a5dac7c6cb9daeb1e1d32f38111bb922891

Comment 1

[Chris Peterson [:cpeterson]]

Lee, this SW-WR bug is a regression from your SWGL compositor changes in bug 1650984.

Comment 2

[Lee Salzman [:lsalzman]]

(In reply to Chris Peterson [:cpeterson] from comment #1)

Lee, this SW-WR bug is a regression from your SWGL compositor changes in bug 1650984.

Can you please post your about:support info?

Comment 3

[Chris Peterson [:cpeterson]]

Attachment: My about:support

Comment 4

[Chris Peterson [:cpeterson]]

I attached my about:support info.

Comment 5

[Lee Salzman [:lsalzman]]

Attachment: Bug 1653374 - fix SwCompositor dependency tracking to account for transitive overlap dependencies. r?gw

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/b045b030ffcb
fix SwCompositor dependency tracking to account for transitive overlap dependencies. r=gw

Comment 7

[Alexandru Michis [:malexandru]]

https://hg.mozilla.org/mozilla-central/rev/b045b030ffcb

Comment 9

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Reproduced the issue using Firefox 80.0a1 (20200716212737) on Windows 10x64 and STR from comment 0.
The issue is verified fixed with Firefox 80.0b6(20200807195315) on Windows 10x64, macOS 10.12 and Ubuntu 18.04.