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Transparent background covered with random image
Reported by
sc60...@gmail.com,
Apr 12 2017
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Issue descriptionUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Firefox/52.0 Steps to reproduce the problem: 1. Open http://blockly.webduino.io/?lang=en 2. Open new tab 3. Switch between these tabs multiple times What is the expected behavior? Background should be white with little grey dot like normal.png What went wrong? Background (white part) covered with random image (mostly is rotated favicon) like actual.png Did this work before? N/A Chrome version: 57.0.2987.133 Channel: stable OS Version: OS X 10.12.4 Flash Version: Shockwave Flash 25.0 r0 I thought it was something to do with Google Blockly Please have a look at screen recording first : https://youtu.be/xv7RqCAJ6GY I tested in Chrome 56, 57 and Canary, they all have same behavior I also tested on Chrome@Windows 10, It seems the issue only exists in Chrome@MacOS After doing some digging, I found that the issue not only exists in Blockly. It appears everything with grey and white in background (transparent background?) have chance to be covered with random image for example, open PNG with transparent background should be like image-normal.png and it sometime shows like image-actual.png Another example is Console, please have look at console-normal.png and console-actual.png This issue isn't easy to reproduce. I tried several MacBook Air, it turns out that only 2 of 3 MBA were affected
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Apr 19 2017
I have this bug with Chrome version: 57.0.2987.133 too.
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Apr 21 2017
Unable to reproduce this issue on Mac OS X 10.12.4 using chrome stable #57.0.2987.133 and chrome latest stable #58.0.3029.81 by following steps mentioned below. Steps to reproduce the problem: 1.Launch chrome and Opened http://blockly.webduino.io/?lang=en 2.Opened new tab 3.Switched between these tabs multiple times and observed no Background (white part) covered with random image (mostly is rotated favicon) Please find the attached screencast for reference. sc60714@:Could you please find the attachment and confirm if anything is missed in triaging the issue. Please try to upgrade to latest stable #58.0.3029.81 and update the thread if issue still exists. Thanks!
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Apr 21 2017
@rkalavakuntla, you were not missed anything. But just like I said, I was not able to reproduce this on every device. I tried even more devices. Mostly devices I tested were not affected, except 2 MacBook which with Intel HD Graphics 6000. I found if I uncheck "Use hardware acceleration when available" in settings, problem just gone. And if I enable it again, it will happen again. Hope this information can give you some clue.
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Apr 21 2017
Thank you for providing more feedback. Adding requester "rkalavakuntla@chromium.org" to the cc list and removing "Needs-Feedback" label. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Apr 22 2017
Also experiencing this on Chrome Mac Version 58.0.3029.81.
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Apr 24 2017
+ A bunch of GPU people. Looks like a pretty bad bug. ccameron is currently OOO, vmiura, could you find someone to take a look at this?
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Apr 25 2017
This is pretty easily reproducible in Chrome Canary on macOS with a MacBook Air with an Intel HD 6000 GPU and the given instructions. Start with a fresh user profile, navigate to this bug, open blockly.webduino.io in a new tab, create another new tab, and switch rapidly between those two. about:gpu follows. --disable-gpu-rasterization works around the problem. Eric, can I assign this to you? Do you have hardware in your office which can reproduce it?
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Apr 25 2017
Possibly related to Issue 710443
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Apr 25 2017
agreed - very likely the same as issue 710443 .
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May 1 2017
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Comment 1 by ajha@chromium.org
, Apr 12 2017