1580527 - Several privileged about: pages have rendering issues with frameloader rebuilding enabled

Status: VERIFIED FIXED

(Core :: DOM: Navigation, defect, P2)

Description

[Cosmin Muntean [:cmuntean], Ecosystem QA]

Attachment: about logins page is not rendered.gif

[Affected Versions]:

• Nightly 71.0a1

[Affected Platforms]

• All Windows
• All Mac
• All Linux

[Steps to reproduce]:

1. Open the latest Nightly browser.
2. Insert "about:logins" address and press the "Enter" key.
3. Observe the page.

[Expected results]:

• The page is successfully rendered.

[Actual results]:

• The page is not rendered until the browser is unfocused.

[Regression]

• This issue is not reproducible on Firefox Beta 70.0b4. Considering this, using mozregression tool I have found the issue that broke this in the latest Nightly build. Here are the results:
  Last good revision: 7a484d560816d3e468d41e67672f6edd99e787e4
  First bad revision: b5ef2b8f7c2b739502c441a776e3266b53d10f5d
  Pushlog: https://tinyurl.com/yy5vec42

It looks like bug 1542415 introduced this behavior.

[Notes]:

• The page is not rendered even if the page is refreshed.
• The issue is not reproducible if the page is open from any context menu.
• Attached a screen recording of the issue.

Comment 1

[Matthew N. [:MattN]]

(In reply to Cosmin Muntean, Experiments QA from comment #0)

• This issue is not reproducible on Firefox Beta 70.0b4.

Correcting the flag for 70.

Comment 2

[Cosmin Muntean [:cmuntean], Ecosystem QA]

I have tested this issue with all the pages from "about:about" page and it seems that is also reproducible for the following pages:

• "about:welcome"
• "about:home"
• "about:newtab"
• "about:library"
• "about:certificate"
• "about:plugins"
• "about:privatebrowsing"
• "about:protections"
• "about:serviceworkers"
• "about:studies"

I did more investigation and the pages are correctly rendered in the following situations:

• After another tab is hovered.
• After a new tab is opened.
• After the browser is unfocused.
• After the browser is resized.

Since this is regressed by bug 1542415, should we move this issue in Core: Document Navigation?

Comment 3

[Matthew N. [:MattN]]

[Tracking Requested - why for this release]: Major regression for about: pages

Comment 4

[Neha Kochar [:neha]]

(In reply to Matthew N. [:MattN] (PM me if requests are blocking you) from comment #3)

[Tracking Requested - why for this release]: Major regression for about: pages

Pref'ed off by default for non-fission windows in https://bugzilla.mozilla.org/show_bug.cgi?id=1580604#c3 so shouldn't need release tracking.

Comment 5

[Kris Maglione [:kmag]]

See also bug 1580604.

Comment 7

[Matt Woodrow (:mattwoodrow)]

The invalidation patch in Bug 1599662 looks like it fixes this.

Comment 8

[Cosmin Muntean [:cmuntean], Ecosystem QA]

I have verified this issue and is no longer reproducible. Tested on the latest Nightly 73.0a1 build (Build ID: 20200103094738) on Windows 7 x64, Mac OS 10.15 and Ubuntu 18.04 x64.