This bug was filed from the Socorro interface and is report bp-5a3649b3-56b3-4d02-8991-55e120180108. ============================================================= Top 10 frames of crashing thread: 0 libxul.so style::properties::{{impl}}::build src/libcore/sync/atomic.rs:1512 1 libxul.so style::properties::cascade toolkit/library/armv7-linux-androideabi/release/build/style-f9ff5860987724b0/out/properties.rs:136906 2 libxul.so style::style_resolver::{{impl}}::cascade_style<style::gecko::wrapper::GeckoElement> servo/components/style/style_resolver.rs:581 3 libxul.so style::style_resolver::{{impl}}::cascade_style_and_visited<style::gecko::wrapper::GeckoElement> servo/components/style/style_resolver.rs:308 4 libxul.so style::style_resolver::{{impl}}::cascade_primary_style<style::gecko::wrapper::GeckoElement> servo/components/style/style_resolver.rs:213 5 libxul.so style::style_resolver::{{impl}}::resolve_style<style::gecko::wrapper::GeckoElement> servo/components/style/style_resolver.rs:172 6 libxul.so style::traversal::compute_style<style::gecko::wrapper::GeckoElement> servo/components/style/style_resolver.rs:268 7 libxul.so geckoservo::glue::traverse_subtree servo/components/style/traversal.rs:422 8 libxul.so geckoservo::glue::Servo_TraverseSubtree servo/ports/geckolib/glue.rs:341 9 libxul.so mozilla::ServoStyleSet::StyleDocument layout/style/ServoStyleSet.cpp:954 ============================================================= 30 crashes from 27 installations on Android nightly. It's the top crash of build 20180105100135.

Any ideas, Cameron? Thanks.

It crashes at https://github.com/rust-lang/rust/blob/05e2e1c41414e8fc73d0f267ea8dab1a3eeeaa99/src/libcore/sync/atomic.rs#L1512 Crash on intrinsics::atomic_xadd_relaxed with either SIGBUS or SIGSEGV. All the reports have > (100.0% in signature vs 05.45% overall) CPU Info = ARMv1 Qualcomm part(0x51002150) features: half,thumb,fastmult,vfpv2,edsp,neon,vfpv3,tls,vfpv4,idiva,idivt Maybe a CPU bug?

Generally, SIBGUS will be that alignment is invalid. But 0xfffffffd will be invalid address to access it.

This is a top crash on Android, but not #1.

This crash is 20180105100135 only although new build is available (20180107100112). Although this issue might be build issue, we need watch whether this occurs on other build id.

Resolving this bug as WFM because there haven't been any crash reports since build ID 20180206200532 on macOS and build ID 20180105100135 on Android.