1747611 - WebGPU stops rendering to the canvas after a short amount of time.

Status: RESOLVED WONTFIX

(Core :: Graphics: WebGPU, defect, P3)

Description

[Danny Fritz]

Attachment: supportdump.txt

Steps to reproduce:

1. Enable WebGPU though about:config
2. Navigate to https://austin-eng.com/webgpu-samples/samples/rotatingCube
3. Wait a brief moment

Actual results:

The canvas stopped moving.

This is a video recording of the problem (plus an unexpected crash). https://www.youtube.com/watch?v=vLsToNSg8f8

Expected results:

The cube is expected to continue rotating.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebGPU' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 2

[Danny Fritz]

Probably related to this mesa bug: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5508
Which was fixed in this mesa release: https://docs.mesa3d.org/relnotes/21.3.0.html

I am on Ubuntu 21.10 which has Mesa 21.2.2-1ubuntu1 which is below the 21.3.0 mesa release.

Comment 3

[Danny Fritz]

Upgraded to Mesa 21.3.2 via https://launchpad.net/~kisak/+archive/ubuntu/kisak-mesa and can confirm the WebGPU Rotating Cube sample works as expected now.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:kvark, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 5

[Dzmitry Malyshau [:kvark]]

It was hanging right away when we used the same semaphore for wait & signal on submission.
My workaround was using 2 different semaphores, and it mostly works. However, it looks like Intel driver still had unsynchronized access to the semaphores, so ping-ponging between 2 semaphores just reduced the possibility of of locking from 100% to something like 1%, but still non-zero.

Comment 6

[Erich Gubler [:ErichDonGubler]]

:dannyfritz: Is this still an issue for you?

Comment 7

[Jim Blandy :jimb]

We're pursuing several other issues of this kind, with more specific reproduction instructions, so I'm going to close this bug.