1452025 - Firefox bug breaks video playback in tab when webrender enabled

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P1)

Description

[get_logan]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Steps to reproduce:

1. Enable webrender (Set gfx.webrender.all to true in about:config and restart browser)
2. Start playing any youtube video
3. Open at least 2 new tabs in same window
4. Tear off the youtube tab so it is now in its own window
5. Minimize the youtube window
6. Cycle the previously created "new tabs" multiple times. (Easier to do this with ctrl + tab keys). The longer you do this for the more likely to trigger the issue.
7. Close the window with the "new tabs."
8. Restore the minimized youtube window. (The youtube video should immediately break and stop playing at this moment).

Video of the issue:
https://youtu.be/PfnLw6kCuMU



Actual results:

The youtube video should stop playing. Refreshing the page does not help and trying to play other videos within same tab also fails. Videos can still be played in new tabs.



Expected results:

The youtube video should have continued to play.

Comment 1

[get_logan]

Testing lastest nightly (2018-04-05) using new Firefox profile. Affects Firefox nightly as bug seems to only occur if webrender is enabled.

My setup:
Intel 6700K, 32GB ram, GTX 1080 Ti, Windows 10 64-bit

Comment 2

[Sotaro Ikeda [:sotaro]]

I confirmed the problem. When the problem happened, the following error happened.

> Failed to OpenSharedResource for SyncObjectD3D11

Comment 3

[Sotaro Ikeda [:sotaro]]

(In reply to Sotaro Ikeda [:sotaro] from comment #2)
> > Failed to OpenSharedResource for SyncObjectD3D11

> GP+[GFX1-]: Failed to OpenSharedResource for SyncObjectD3D11: 0x80070057

Comment 4

[get_logan]

Testing latest nightly 2018-07-03 and I can no longer reproduce this issue.

Comment 5

[Sotaro Ikeda [:sotaro]]

Thanks for the confirmation!