1985176 - [HDR] Crash in [@ mozilla::layers::NativeLayerWayland::UpdateLayerPlacementLocked]

Status: RESOLVED FIXED

(Core :: Widget: Gtk, defect, P3)

Description

[BugBot [:suhaib / :marco]]

Crash report: https://crash-stats.mozilla.org/report/index/abff0187-5f7e-4d12-8471-afd550250825

MOZ_CRASH Reason: MOZ_DIAGNOSTIC_ASSERT(IsMapped())

Top 10 frames of crashing thread:

0  libxul.so  MOZ_CrashSequence  mfbt/Assertions.h:248
0  libxul.so  mozilla::layers::NativeLayerWayland::UpdateLayerPlacementLocked  gfx/layers/NativeLayerWayland.cpp:757
1  libxul.so  mozilla::layers::NativeLayerWayland::RenderLayer  gfx/layers/NativeLayerWayland.cpp:812
2  libxul.so  mozilla::layers::NativeLayerRootWayland::CommitToScreen  gfx/layers/NativeLayerWayland.cpp:497
3  libxul.so  mozilla::wr::RenderCompositorNative::CompositorEndFrame  gfx/webrender_bindings/RenderCompositorNative.cpp:279
4  libxul.so  webrender::renderer::Renderer::render_impl  gfx/wr/webrender/src/renderer/mod.rs:1850
5  libxul.so  webrender::renderer::Renderer::render  gfx/wr/webrender/src/renderer/mod.rs:1344
6  libxul.so  wr_renderer_render  gfx/webrender_bindings/src/bindings.rs:651
7  libxul.so  mozilla::wr::RendererOGL::UpdateAndRender  gfx/webrender_bindings/RendererOGL.cpp:230
7  libxul.so  mozilla::wr::RenderThread::UpdateAndRender  gfx/webrender_bindings/RenderThread.cpp:849

By querying Nightly crashes reported within the last 2 months, here are some insights about the signature:

• First crash report: 2025-07-23
• Process type: Parent
• Is startup crash: No
• Has user comments: No
• Is null crash: Yes - all crashes happened on null or near null memory address

Comment 1

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

Looks like there's a race between it's visible and it's mapped states.

Comment 2

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

Attachment: Bug 1985176 [Wayland] Don't assert on unmapped surfaces at NativeLayerWayland::UpdateLayerPlacementLocked() r?emilio

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/6a24ba35d32f
https://hg.mozilla.org/integration/autoland/rev/a18e20de4af4
[Wayland] Don't assert on unmapped surfaces at NativeLayerWayland::UpdateLayerPlacementLocked() r=emilio

Comment 4

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/a18e20de4af4