Two windows font crashes: https://crash-stats.mozilla.com/search/?app_notes=~WR%2B&build_id=%3E%3D20181212051241&proto_signature=~FontContext&platform=Windows&process_type=gpu&date=%3E%3D2018-12-10T19%3A01%3A42.000Z&date=%3C2018-12-17T19%3A01%3A42.000Z&_sort=-date&_facets=signature&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#crash-reports This bug was filed from the Socorro interface and is report bp-a8836195-48e5-43e1-bbc8-3cc100181215. > assertion failed: hr == 0 ============================================================= Top 10 frames of crashing thread: 0 xul.dll ?MOZ_CrashOOL@@YAXPEBDH0@Z.llvm.11760422024122218564 mfbt/Assertions.h:314 1 xul.dll GeckoCrashOOL toolkit/xre/nsAppRunner.cpp:5118 2 xul.dll static void gkrust_shared::panic_hook toolkit/library/rust/shared/lib.rs:234 3 xul.dll static void core::ops::function::Fn::call<fn /libcore/ops/function.rs:78 4 xul.dll static void std::panicking::rust_panic_with_hook /rustc/abe02cefd6cd1916df62ad7dc80161bea50b72e8/src/libstd/panicking.rs:480 5 xul.dll static <NoType> std::panicking::begin_panic<str*> /libstd/panicking.rs:410 6 xul.dll static struct dwrote::glyph_run_analysis::GlyphRunAnalysis webrender::platform::windows::font::FontContext::create_glyph_analysis gfx/wr/webrender/src/platform/windows/font.rs:294 7 xul.dll static void rayon::iter::plumbing::bridge_producer_consumer::helper<rayon::slice::IterProducer<webrender::glyph_rasterizer::GlyphKey>, rayon::iter::map::MapConsumer<rayon::iter::collect::consumer::CollectConsumer<webrender::glyph_rasterizer::GlyphRasterJob>, closure>> third_party/rust/rayon/src/iter/plumbing/mod.rs:418 8 xul.dll static struct third_party/rust/rayon-core/src/join/mod.rs:128 9 xul.dll static void rayon::iter::plumbing::bridge_producer_consumer::helper<rayon::slice::IterProducer<webrender::glyph_rasterizer::GlyphKey>, rayon::iter::map::MapConsumer<rayon::iter::collect::consumer::CollectConsumer<webrender::glyph_rasterizer::GlyphRasterJob>, closure>> third_party/rust/rayon/src/iter/plumbing/mod.rs:409 =============================================================

https://crash-stats.mozilla.com/search/?app_notes=~WR%2B&moz_crash_reason=~assertion%20failed%3A%20hr%20%3D%3D%200&date=%3E%3D2018-09-17T21%3A22%3A36.000Z&date=%3C2018-12-17T19%3A22%3A36.000Z&_sort=-date&_facets=signature&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-signature This crash reason also appeared in bug 1424122 and bug 1455848 on Win10.