Bug 259859 – [GTK][Nvidia] WebProcess crash in WebCore::GBMBufferSwapchain::getBuffer when logging in to Google

• Component: WebKitGTK
• Status: RESOLVED DUPLICATE

[Kdwk]

Created attachment 467207 [details]
gdb (bt full; c) output.txt

1. Log into Google
2. Type username
3. Enter
4. WebProcess crash

Tested with: Gnome Web 44.6/ WebKitGTK 2.40.4
Tested on: Nvidia RTX 4070 (driver version 535 via Universal Blue)

[Kdwk]

This seems to be happening all over the place. I just hit this when scrolling through Reddit

[Kdwk]

This just happened again on Proton Mail

[Michael Catanzaro]

This looks really familiar, but I couldn't immediately find any related bug reports.

I wonder if this is fixed on main by the recent graphics stack changes there.

[Kdwk]

Looks similar: https://bugs.webkit.org/show_bug.cgi?id=258831

[Michael Catanzaro]

Heh, and I had just commented in that bug one hour before this one. Well, you're right. Good find.

The bug is not identical, though, so I'll mark it as See Also rather than a duplicate.

[Kdwk]

Created attachment 467322 [details]
gdb (bt full; c) 2.txt

Hit it again in Tech Preview (I can use it now after disabling DMABUF).

I'm hitting this in lots of different places. It is as of now the biggest barrier to daily driving Epiphany on Nvidia hardware because it reliably stops users from logging in to Google or using Reddit.

[Kdwk]

It affects both stable 2.40 and 2.41 series

[Carlos Garcia Campos]

(In reply to kdwkleung from comment #7)
> It affects both stable 2.40 and 2.41 series

Are you sure? we don't use use GBMBufferSwapchain in 2.41 since 2.41.6.

[Michael Catanzaro]

(In reply to Michael Catanzaro from comment #5)
> The bug is not identical, though, so I'll mark it as See Also rather than a
> duplicate.

Looking this over again, I think it's really the same bug.

*** This bug has been marked as a duplicate of bug 258831 ***

[Kdwk]

I disabled DMABUF and am using the WPE renderer because using DMABUF results in a blank screen in 2.41.x (Nvidia hardware). Could that be why GBMBufferSwapchain is still used?

[Carlos Garcia Campos]

(In reply to kdwkleung from comment #6)
> Created attachment 467322 [details]
> gdb (bt full; c) 2.txt
> 
> Hit it again in Tech Preview (I can use it now after disabling DMABUF).

What do you mean by disabling DMABUF exactly? Because the DMABUF renderer has nothing to do with the DMABUF used for WebGL.

> I'm hitting this in lots of different places. It is as of now the biggest
> barrier to daily driving Epiphany on Nvidia hardware because it reliably
> stops users from logging in to Google or using Reddit.

[Kdwk]

(In reply to Carlos Garcia Campos from comment #11)
> (In reply to kdwkleung from comment #6)
> > Created attachment 467322 [details]
> > gdb (bt full; c) 2.txt
> > 
> > Hit it again in Tech Preview (I can use it now after disabling DMABUF).
> 
> What do you mean by disabling DMABUF exactly? Because the DMABUF renderer
> has nothing to do with the DMABUF used for WebGL.
> 
> > I'm hitting this in lots of different places. It is as of now the biggest
> > barrier to daily driving Epiphany on Nvidia hardware because it reliably
> > stops users from logging in to Google or using Reddit.

WEBKIT_DISABLE_DMABUF_RENDERER=1

[Carlos Garcia Campos]

(In reply to kdwkleung from comment #12)
> (In reply to Carlos Garcia Campos from comment #11)
> > (In reply to kdwkleung from comment #6)
> > > Created attachment 467322 [details]
> > > gdb (bt full; c) 2.txt
> > > 
> > > Hit it again in Tech Preview (I can use it now after disabling DMABUF).
> > 
> > What do you mean by disabling DMABUF exactly? Because the DMABUF renderer
> > has nothing to do with the DMABUF used for WebGL.
> > 
> > > I'm hitting this in lots of different places. It is as of now the biggest
> > > barrier to daily driving Epiphany on Nvidia hardware because it reliably
> > > stops users from logging in to Google or using Reddit.
> 
> WEBKIT_DISABLE_DMABUF_RENDERER=1

That shouldn't affect WebGL, what WebKitGTK version exactly?

[Kdwk]

Both Gnome Web 44.6/ WebKitGTK 2.40.4 and Epiphany Technology Preview 45.beta-26-ge3949b7dc+/ WebKitGTK 2.41.90

[Carlos Garcia Campos]

(In reply to kdwkleung from comment #14)
> Both Gnome Web 44.6/ WebKitGTK 2.40.4 and Epiphany Technology Preview
> 45.beta-26-ge3949b7dc+/ WebKitGTK 2.41.90

I don't understand how a GraphicsContextGLGBM can be created with 2.41.90, could you provide a bt of 2.41.90?

I see reshapeDisplayBufferBacking in the bt which was removed in April in 263496@main

[Kdwk]

Created attachment 467324 [details]
gdb (bt full; c) from WebKitGTK 2.41.9

This is freshly caught be visiting reddit.com. Interestingly, I can now log in to Google.

[Carlos Garcia Campos]

(In reply to kdwkleung from comment #16)
> Created attachment 467324 [details]
> gdb (bt full; c) from WebKitGTK 2.41.9
> 
> This is freshly caught be visiting reddit.com. Interestingly, I can now log
> in to Google.

Ok, this makes more sense. You can log in google because that uses WebGL, the reddit issue is because of the media player. You can workaround the issue for now by disabling dmabuf video sink (WEBKIT_GST_DMABUF_SINK_DISABLED=1). The problem is that for some reason gbm_bo_create() is failing. I can try to add a null check there, but we need to figure out why it's failing.

[Kdwk]

(In reply to Carlos Garcia Campos from comment #17)
> You can workaround the issue for now by disabling dmabuf video sink
> (WEBKIT_GST_DMABUF_SINK_DISABLED=1).

This makes the page not crash but all HTML5 video tag elements fail to play

[Carlos Garcia Campos]

(In reply to kdwkleung from comment #18)
> (In reply to Carlos Garcia Campos from comment #17)
> > You can workaround the issue for now by disabling dmabuf video sink
> > (WEBKIT_GST_DMABUF_SINK_DISABLED=1).
> 
> This makes the page not crash but all HTML5 video tag elements fail to play

That means the gl video sink is broken too :-( Any error on stderr/stdout?

[Kdwk]

No, I can't see any

[Philippe Normand]

Then you should add this WEBKIT_GST_DISABLE_GL_SINK=1 to the env var soup. Since nothing works with nvidia.

[Kdwk]

(In reply to Philippe Normand from comment #21)
> Then you should add this WEBKIT_GST_DISABLE_GL_SINK=1 to the env var soup.
> Since nothing works with nvidia.

That appears to work at first but after a while Epiphany keeps getting SIGSEGV on sites with video like apple.com

[Kdwk]

If I look at the backtrace it looks like “?? ()”