I hit this crash twice today:

bp-1875e93a-2f7d-4081-9c3b-c9cc00210212
bp-a5d8a184-325e-443b-aef5-f98a00210212

I have SW-WR enabled on Windows 10. 100% of the crash reports from the last six months are from Windows 10.

Reason: EXCEPTION_ACCESS_VIOLATION_READ

Top 10 frames of crashing thread:

0 d3d11.dll static long __stdcall CContext::TID3D11DeviceContext_Map_<2> 
1 xul.dll mozilla::wr::RenderCompositorD3D11SWGL::MapTile gfx/webrender_bindings/RenderCompositorD3D11SWGL.cpp:315
2 xul.dll mozilla::wr::wr_compositor_map_tile gfx/webrender_bindings/RenderCompositor.cpp:134
3 xul.dll webrender_bindings::bindings::{{impl}}::map_tile gfx/webrender_bindings/src/bindings.rs:1408
4 xul.dll webrender::compositor::sw_compositor::{{impl}}::bind gfx/wr/webrender/src/compositor/sw_compositor.rs:1473
5 xul.dll webrender::renderer::Renderer::draw_frame gfx/wr/webrender/src/renderer/mod.rs:4448
6 xul.dll webrender::renderer::Renderer::render_impl gfx/wr/webrender/src/renderer/mod.rs:2154
7 xul.dll webrender::renderer::Renderer::render gfx/wr/webrender/src/renderer/mod.rs:1890
8 xul.dll webrender_bindings::bindings::wr_renderer_render gfx/webrender_bindings/src/bindings.rs:634
9 xul.dll mozilla::wr::RendererOGL::UpdateAndRender gfx/webrender_bindings/RendererOGL.cpp:186