1720455 - KDE Wayland + force enabled OS compositor: Firefox crashes when trying to render a menu

Status: RESOLVED DUPLICATE of bug 1718688

(Core :: Widget: Gtk, defect)

Description

[SoilpH96]

Attachment: crash report

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:90.0) Gecko/20100101 Firefox/90.0

Steps to reproduce:

• Start Firefox in a native Wayland session (KDE, not XWayland)
• Try to open any menu (hamburger menu, right click menu, menu bar)

Actual results:

• Firefox crashes, generating a crash report. This happens consistently.

Comment 1

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

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

Comment 2

[SoilpH96]

After additional testing, the problem seems to be related to force-enabling the webrender compositor (gfx.webrender.compositor.force-enabled: true). Disabling this allows normal use of Firefox with webrender under Wayland, but did not cause issues on previous Firefox versions.

Comment 3

[Martin Stránský [:stransky] (ni? me)]

Can you please submit the crash report and post its ID here?
Thanks.

Comment 4

[SoilpH96]

(In reply to Martin Stránský [:stransky] (ni? me) from comment #3)

Can you please submit the crash report and post its ID here?
Thanks.

bp-56847067-d4b9-4796-9017-e73100210714

Comment 5

[Martin Stránský [:stransky] (ni? me)]

Can this me this one?
https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/composite/LayerManagerComposite.cpp#172

Are you running WebRender compositor?

Robert, is that related? I see GetNativeLayerRoot() is used on the Compositor only.

Comment 6

[Darkspirit]

(In reply to SoilpH96 from comment #4)

(In reply to Martin Stránský [:stransky] (ni? me) from comment #3)

Can you please submit the crash report and post its ID here?
Thanks.

bp-56847067-d4b9-4796-9017-e73100210714

That's bug 1718688.

Comment 8

[Robert Mader [:rmader]]

Edit: wow, Darkspirit was faster than me :)

The crash report indeed says "wrCompositor":{"status":"force_enabled"}, so looks like a dup of bug 1718688.

SoilpH96: gfx.webrender.compositor.force-enabled should fix the issue - up until 89 it just did nothing, now there is an experimental compositor backend.

Martin, I'm sorry, I should have force disabled the setting on release :( (otoh that's the risk of enabling random settings)
In beta/91 things are already much more stable.