1237154 - Long page turns white and scrollbars go black when scrolling really fast using a touchpad

Status: RESOLVED WORKSFORME

(Core :: Panning and Zooming, defect)

Description

[(no longer active)]

This is on a MacBook running OS X 10.11.2.

STR:

1. Load <https://bugzilla.mozilla.org/buglist.cgi?quicksearch=ALL%20sum%3A%22This%20test%20exceeded%20the%20timeout%20threshold%22&list_id=12775114>.  You should be logged in.  I'm using the Mozilla skin, not sure if that matters.
2. Scroll up or down really fast using the touchpad.

The page goes completely white (and both of the scrollbars go completely black) momentarily before the page is painted correctly.

Comment 1

[u279076]

Does not reproduce on my Macbook Pro. Can you please provide a copy of about:support and check if this happens on a new profile?

Comment 2

[u279076]

Also, if you can confirm this is a regression locally, please use mozregression to get a regression window. Thanks.

Comment 3

[(no longer active)]

Sorry I won't be able to get a regression range, but this probably requires a retina display (according to kats).  Here is my about:support:

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Comment 4

[Kartikaya Gupta (email:[e-mail])]

I looked at ehsan reproducing it, and it looked more or less like checkerboarding except for the black column on the scrollbar track. It might be that we're far enough away from the displayport that the scrollbar is also not getting painted, or something.

Comment 5

[Kartikaya Gupta (email:[e-mail])]

(That being said, if we can address the checkerboarding, the black scrollbar issue should go away as well).

Comment 6

[u279076]

I can reproduce the temporarily empty content area while scrolling fast on my Macbook Pro 13" Retina 2013 but not the black scroll bar.

Comment 7

[u279076]

(In reply to Anthony Hughes, QA Mentor (:ashughes) from comment #6)
> I can reproduce the temporarily empty content area while scrolling fast on
> my Macbook Pro 13" Retina 2013 but not the black scroll bar.

In case it is relevant, this also happens on my external monitor (Dell U2410 1080p) connect by HDMI via Thunderbolt.

Comment 8

[Markus Stange [:mstange]]

Ehsan, are you using overlay scrollbars or "classic" scrollbars?

Comment 9

[(no longer active)]

Overlay scrollbars (aka the default on OS X.)

Comment 10

[Paul Oiegas [:poiegas], PM for (Ecosystem QA, Services QA, WebCompat QA, Ads QA, and Solo QA teams)]

Hi guys,

I was able to reproduce the empty content part of the issue but not the black scroll bars, same as Anthony. 
Also, I have used mozregression to find the regression build and it seams that the last good build was in 2015-07-21 and first bad was in 2015-07-22.

Here is the Pushlog link with the issue that created the regression:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=6ad92b48085b5ec5532f14e0b9e3c5eb15ad9fa8&tochange=cfc312d8ef205bcb6a58b840459a4ccd922dcf88

Used a MacBook Pro retina 13" with Mac OS X 10.11.2 to reproduce this.

Thanks,
Paul

Comment 11

[Petruta Horea [:phorea], Desktop Test Engineering]

Reproduced too the empty content on a MacBook Pro retina under Mac OS X 10.9.5 while testing the Async Scrolling in e10s using latest Dev Edition 46.0a2 and Nightly 47.0a1 2016-01-28.

Comment 12

[Liz Henry (:lizzard) (relman/hg->git project)]

Tracking for 46+ since this is a regression.

Comment 13

[Kartikaya Gupta (email:[e-mail])]

The empty content is just checkerboarding, more or less expected when scrolling really fast. We can work on improving checkerboarding across the board but it will be many small improvements rather than one big fix.

Seems like nobody else has been successful at reproducing the black scrollbar area though, even on roughly similar hardware/platform. I wonder if it has something to do with window size. Or maybe it's an unrelated bug that has since been fixed.

Comment 14

[Markus Stange [:mstange]]

The only time I've seen a black scrollbar myself was with the testcase from bug 1243000, and even then only in a fresh profile and not in my main browsing profile. In that bug, *not* painting checkerboarding is somehow causing the scrollbars to go black.

Comment 15

[(no longer active)]

This is definitely not fixed!  Just repro'ed on the latest Nightly.

Comment 16

[(no longer active)]

Attachment: layer dump

I captured this log with kats looking over my shoulder.  This should show the bug towards the end of the log.

Comment 17

[Kartikaya Gupta (email:[e-mail])]

This is kind of a guess since I'm not 100% sure I found the right spot in the log, but I see a bunch of frames during the heavy scrolling, where the shadow-visible region of the PaintedLayerComposite goes empty. Since the shadow-visible is empty the layer gets culled, and since it's culled we don't draw the background/checkerboarding color either. I'm not really sure what we draw there but it might explain the black. Compare for example these two lines for the same layer taken from adjacent layer dumps. The first one doesn't have a shadow-visible and the second one does:

        PaintedLayerComposite (0x116c67000) [shadow-clip=(x=0, y=0, w=2674, h=1934)] [shadow-transform=[ 1 0; 0 1; 0 -8226; ]] [transform=[ 1 0; 0 1; 0 -15118; ]] [bounds=(x=0, y=0, w=2994, h=27259)] [visible=< (x=0, y=10240, w=2994, h=8192); >] { hitregion=< (x=0, y=0, w=2994, h=27260); >} [metrics0={ [cb=(x=0.000000, y=0.000000, w=2674.000000, h=1934.000000)] [sr=(x=0.000000, y=0.000000, w=1496.699951, h=13629.716797)] [s=(0,7559)] [dp=(x=0.000000, y=-2439.000000, w=1496.699951, h=4096.000000)] [cdp=(x=0.000000, y=0.000000, w=0.000000, h=0.000000)] [color=rgba(246, 244, 236, 1.000000)] [scrollId=15] [rcd] [clip=(x=0, y=0, w=2674, h=1934)] [z=2] }] [valid=< (x=0, y=10240, w=2994, h=8192); >]

        PaintedLayerComposite (0x116c67000) [shadow-clip=(x=0, y=0, w=2674, h=1934)] [shadow-transform=[ 1 0; 0 1; 0 -3156; ]] [shadow-visible=< (x=0, y=3156, w=2674, h=1934); >] [transform=[ 1 0; 0 1; 0 -6476; ]] [bounds=(x=0, y=0, w=2994, h=27259)] [visible=< (x=0, y=2048, w=2994, h=8192); >] { hitregion=< (x=0, y=0, w=2994, h=27260); >} [metrics0={ [cb=(x=0.000000, y=0.000000, w=2674.000000, h=1934.000000)] [sr=(x=0.000000, y=0.000000, w=1496.699951, h=13629.716797)] [s=(0,3238)] [dp=(x=0.000000, y=-2214.000000, w=1496.699951, h=4096.000000)] [cdp=(x=0.000000, y=0.000000, w=0.000000, h=0.000000)] [color=rgba(246, 244, 236, 1.000000)] [scrollId=15] [rcd] [clip=(x=0, y=0, w=2674, h=1934)] [z=2] }] [valid=< (x=0, y=2048, w=2994, h=8192); >]

Comment 18

[Kartikaya Gupta (email:[e-mail])]

I'll put together a patch that prevents the layer from being culled if it has a background color. I'm not sure if we should land that, but if Ehsan can apply it and see if it fixes the problem at least it would confirm my diagnosis.

Comment 19

[Kartikaya Gupta (email:[e-mail])]

So I noticed that we have code that already does what I was intending to do, but it only takes effect on opaque layers. When I load the bugzilla page, the layer I pointed out is opaque and so it does take effect. From ehsan's layer dump though, it seems like he's getting it as not opaque (there's no [opaqueContent] in the line I posted above). That might explain why he's seeing this problem and other people are not. I fiddled with the code a bit locally and was able to repro something like what he was seeing, so I'm pretty sure I'm on the right track. But that just means the lack of opaque-content flag is the root cause for him, and we need to figure out why that's happening.

Comment 20

[Kartikaya Gupta (email:[e-mail])]

I tried fiddling with a few bugzilla settings but I couldn't get the page to load without [opaqueContent]. Not sure why it's happening for Ehsan - maybe he has other prefs in his profile that are also coming into play. I'm wondering if we should always treat the root content document as opaque for the purpose of checkerboarding.

Comment 21

[Kartikaya Gupta (email:[e-mail])]

Attachment: Speculative fix

If you have some time, can you try applying this patch and see if it fixes the blackness in the scrollbar area?

Comment 22

[(no longer active)]

Do you mind making a try build please on OSX?

Comment 23

[Kartikaya Gupta (email:[e-mail])]

Sure, here you go: https://treeherder.mozilla.org/#/jobs?repo=try&revision=b44e42a79d1e

Comment 24

[(no longer active)]

Thanks!  I'll get back to you tomorrow (when I'm using this machine again!)

Comment 25

[(no longer active)]

Comment on attachment 8714328 [details] [diff] [review]
Speculative fix

This fixes the blackness issue.  Thanks, kats!

Comment 26

[Kartikaya Gupta (email:[e-mail])]

Cool, so at least I understand what's going on. I'm not sure if this is a good way to fix it though. My main concern is that if the RCD layer is intentionally transparent and there's other stuff underneath at a lower z-index, then we'll be painting over that with the background color during checkerboard (basically the opposite of what happened in bug 1038214).

A better fix might be to make sure the RCD layer gets marked as opaque on the layout side if there's nothing under it, or maybe to investigate further why Ehsan is getting a non-opaque RCD layer in the first place, if that's unexpected.

Comment 27

[(no longer active)]

Would it help if I save and attach the page to the bug?

Comment 28

[Kartikaya Gupta (email:[e-mail])]

If you (1) save the page and (2) can repro the bug on the saved page in a clean profile, then yes - please attach the saved page to the bug.

Comment 29

[Kartikaya Gupta (email:[e-mail])]

This sounds like the same issue as bug 1243000.

Comment 30

[Milan Sreckovic [:milan] (needinfo for best results)]

If we think this is a duplicate of bug 1243000 we should track that one on 46.

Comment 31

[Markus Stange [:mstange]]

It's possible that this will be fixed by bug 1238564. This bug is the one that's severe enough to track, so let's keep tracking this one. I will work on bug 1243000 next. If this bug still exists after both have been fixed, we can reconsider.

Comment 32

[Kartikaya Gupta (email:[e-mail])]

Ehsan, do you still see this issue? It may have been fixed by bug 1238564 which landed last week.

Comment 33

[(no longer active)]

The scrollbar blackness issue is gone.  Now we just checkerboard as normal.

Comment 34

[Kartikaya Gupta (email:[e-mail])]

Awesome, thanks for confirming! Assuming fixed by bug 1238564 although it's probably not worth spending the time to confirm that.

Comment 35

[Liz Henry (:lizzard) (relman/hg->git project)]

This should be fixed in beta 4 by the uplifts in bug 1238564 as well. When that happens we can mark 46 and 47 fixed too.