1383104 - Refreshing the VR page causes the VR device to have jerky movements or crash

Status: RESOLVED WORKSFORME

(Core :: WebVR, defect, P2)

Description

[Bogdan Maris [:bogdan_maris], Release Desktop QA]

[Affected versions]:
- Firefox 55 beta 10

[Affected platforms]:
- Windows 10 64/32bit

[Steps to reproduce]:
1. Launch Fx and go to https://aframe.io/a-painter/ .
2. Click from the page the VR button to start the demo.
3. Refresh the web page.

[Expected result]:
- The browser refreshes and the drawing is reset.

[Actual result]:
- The browser moves slowly with jerky moves or it crashes.

[Regression range]:
- This is not a regression as this feature is new.

[Additional notes]:
- The browser displays a smooth image. The jerky moves may cause headaches to users. Crash signatures: 
https://crash-stats.mozilla.com/report/index/0878b445-f1c7-4696-9c8a-7aeda0170720

Comment 1

[Lars Bergstrom (:larsberg)]

The crash may be a dupe of:
https://bugzilla.mozilla.org/show_bug.cgi?id=1383107

The A-Painter slowdown is possibly the same situation as:
https://bugzilla.mozilla.org/show_bug.cgi?id=1383097

Comment 2

[Diego Marcos [:dmarcos]]

Can you reproduce the performance degradation across reloads consistently with a-painter? What about other WebVR examples? 

I've seen this in the past but I could not find consistent steps to reproduce. 

I think this is different than https://bugzilla.mozilla.org/show_bug.cgi?id=1383097

Comment 3

[:kip (Kearwood Gilbert)]

Perhaps uplifting Bug 1381165 could help with the degradation of performance.  It could be the same root cause, if this is no longer reproducible on Nightly.

Comment 4

[Cristian Comorasu, QA [:ccomorasu], Release Desktop QA]

(In reply to Diego Marcos [:dmarcos] from comment #2)
> Can you reproduce the performance degradation across reloads consistently
> with a-painter? What about other WebVR examples? 
 This issue reproduces on other pages as well, mainly if using Oculus.

> I've seen this in the past but I could not find consistent steps to
> reproduce. 
 I will re-test this issue as soon as possible and provide more info. 

> I think this is different than
> https://bugzilla.mozilla.org/show_bug.cgi?id=1383097
 Yes, I also think this is a different issue.

Comment 5

[Cristian Comorasu, QA [:ccomorasu], Release Desktop QA]

I re-tested using Fx 55.0b13. 
Now refreshing the page causes the Oculus to be turned off, however after the user selects Enter VR button the experience is no longer jerky.

Comment 6

[:kip (Kearwood Gilbert)]

There is a good chance that Bug 1394561 has corrected this.

Could you please re-test in Nightly and let me know if it still occurs?

Comment 7

[Cristian Comorasu, QA [:ccomorasu], Release Desktop QA]

I re-verified using Fx 57.0b5 and Fx 58.0a1 (build ID: 20171004100049) on Windows 10 x64 and I can confirm the latest changes fixed this issue was fixed as well.