Found while fuzzing m-c 20220304-b01b8627f45f (--enable-thread-sanitizer --enable-fuzzing)
To reproduce via Grizzly Replay:
```
$ pip install fuzzfetch grizzly-framework
$ python -m fuzzfetch -t --fuzzing -n firefox
$ python -m grizzly.replay ./firefox/firefox testcase.html
```
```
WARNING: ThreadSanitizer: data race (pid=30010)
Write of size 4 at 0x7b6c0000b618 by thread T17:
#0 UnsetFlags /builds/worker/workspace/obj-build/dist/include/nsWrapperCache.h:285:12 (libxul.so+0x5027044)
#1 UnsetFlags /builds/worker/checkouts/gecko/dom/base/nsINode.h:1318:21 (libxul.so+0x5027044)
#2 Gecko_UnsetNodeFlags /builds/worker/checkouts/gecko/layout/style/GeckoBindings.cpp:270:32 (libxul.so+0x5027044)
#3 style::gecko::wrapper::GeckoElement::unset_flags::hd2bae9c72374eb89 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:667:9 (libxul.so+0x7f9f17f)
#4 _$LT$style..gecko..wrapper..GeckoElement$u20$as$u20$style..dom..TElement$GT$::clear_descendant_bits::h5c3cdbd8d552d2f2 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:1428:9 (libxul.so+0x7f9f17f)
#5 style::traversal::clear_descendant_data::hfd438933a014a9cd /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:851:5 (libxul.so+0x7f9f17f)
#6 style::traversal::recalc_style_at::h825868bd8f2fc4a8 /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:440:17 (libxul.so+0x7fa9b3b)
#7 _$LT$style..gecko..traversal..RecalcStyleOnly$u20$as$u20$style..traversal..DomTraversal$LT$style..gecko..wrapper..GeckoElement$GT$$GT$::process_preorder::h51801bb01cb7fb03 /builds/worker/checkouts/gecko/servo/components/style/gecko/traversal.rs:37:13 (libxul.so+0x7fa9b3b)
#8 style::traversal::recalc_style_at::h825868bd8f2fc4a8 /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:440:17 (libxul.so+0x7fa9b3b)
#9 _$LT$style..gecko..traversal..RecalcStyleOnly$u20$as$u20$style..traversal..DomTraversal$LT$style..gecko..wrapper..GeckoElement$GT$$GT$::process_preorder::h51801bb01cb7fb03 /builds/worker/checkouts/gecko/servo/components/style/gecko/traversal.rs:37:13 (libxul.so+0x7fa9b3b)
#10 style::parallel::top_down_dom::h3d12f5fd6fdb9f63 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:197:13 (libxul.so+0x7fa9561)
#11 style::parallel::traverse_nodes::_$u7b$$u7b$closure$u7d$$u7d$::h25ccac476fbf0260 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:282:17 (libxul.so+0x7fa9561)
#12 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h724c9324c074379c /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:47 (libxul.so+0x7fa9561)
#13 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::hb92fb87058eeb32f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fa9561)
#14 std::panicking::try::do_call::hd79f2cd18775379f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fa9561)
#15 std::panicking::try::h835bb2e86967a2c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fa9561)
#16 std::panic::catch_unwind::h43a1743956601189 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fa9561)
#17 rayon_core::unwind::halt_unwinding::h5129718133a90d9f /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fa9561)
#18 rayon_core::scope::ScopeBase::execute_job_closure::hbb790bb983272014 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:650:15 (libxul.so+0x7fa9561)
#19 rayon_core::scope::ScopeBase::execute_job::hcc0a316691188b80 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:640:29 (libxul.so+0x7fa9561)
#20 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::he6a9965468186353 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:17 (libxul.so+0x7fa9561)
#21 _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::h0b56642f7c0a45d9 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:167:9 (libxul.so+0x7fa9561)
#22 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0x8490ee2)
#23 _$LT$rayon_core..job..JobFifo$u20$as$u20$rayon_core..job..Job$GT$::execute::hf53ee5392bdd888d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:211:50 (libxul.so+0x8490ee2)
#24 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0xaadf85)
#25 rayon_core::registry::WorkerThread::execute::h8c4331d7525412a4 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:749:9 (libxul.so+0xaadf85)
#26 rayon_core::registry::WorkerThread::wait_until_cold::h8ae159f27c00d846 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:726:17 (libxul.so+0xaadf85)
#27 rayon_core::registry::WorkerThread::wait_until::h4f2932e4eec36717 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:700:13 (libxul.so+0x8493f92)
#28 rayon_core::registry::main_loop::h0e37a2d4fe2032df /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:833:5 (libxul.so+0x8493f92)
#29 rayon_core::registry::ThreadBuilder::run::h6e628b264653257a /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:55:18 (libxul.so+0x8493f92)
#30 _$LT$rayon_core..registry..DefaultSpawn$u20$as$u20$rayon_core..registry..ThreadSpawn$GT$::spawn::_$u7b$$u7b$closure$u7d$$u7d$::h513e75fe6b3391c0 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:100:20 (libxul.so+0x8493f92)
#31 std::sys_common::backtrace::__rust_begin_short_backtrace::h5b42f8bbb8fe5c10 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:123:18 (libxul.so+0x8493f92)
#32 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#33 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#34 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#35 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#36 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#37 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#38 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#39 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#40 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#41 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#42 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#43 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#44 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#45 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#46 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h6101b21655d0709f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#47 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h314b9b19f4338a45 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#48 std::sys::unix::thread::Thread::new::thread_start::h31f5f540df5473d8 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys/unix/thread.rs:108:17 (libxul.so+0x859cd66)
Previous read of size 4 at 0x7b6c0000b618 by thread T15:
#0 style::gecko::wrapper::GeckoNode::flags::h4ccef17399009190 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:275:9 (libxul.so+0x7fd4232)
#1 style::gecko::wrapper::GeckoElement::flags::hdef176f51d25aeb9 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:653:9 (libxul.so+0x7fd4232)
#2 style::gecko::wrapper::GeckoElement::is_root_of_native_anonymous_subtree::hd1b943b383b5f0b7 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:805:16 (libxul.so+0x7fd4232)
#3 _$LT$style..gecko..wrapper..GeckoElement$u20$as$u20$selectors..tree..Element$GT$::ignores_nth_child_selectors::ha80627117a236f22 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:2283:9 (libxul.so+0x7fd4232)
#4 selectors::matching::matches_generic_nth_child::h3d3f3e13670ddd13 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:887:8 (libxul.so+0x7fd4232)
#5 selectors::matching::matches_simple_selector::h31078e5982a516b9 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:839:13 (libxul.so+0x7fd4232)
#6 selectors::matching::matches_compound_selector::_$u7b$$u7b$closure$u7d$$u7d$::hac3607d579d3293e /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:644:23 (libxul.so+0x7fd3356)
#7 core::iter::traits::iterator::Iterator::all::check::_$u7b$$u7b$closure$u7d$$u7d$::h444da473ecf06355 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2346:20 (libxul.so+0x7fd3356)
#8 core::ops::function::impls::_$LT$impl$u20$core..ops..function..FnMut$LT$A$GT$$u20$for$u20$$RF$mut$u20$F$GT$::call_mut::h055a8fc2c9e689c2 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:269:13 (libxul.so+0x7fd3356)
#9 core::iter::traits::iterator::Iterator::try_fold::h25172faa366da34f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:1995:21 (libxul.so+0x7fd3356)
#10 _$LT$core..iter..adapters..chain..Chain$LT$A$C$B$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h300b41a723a07a03 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/adapters/chain.rs:104:19 (libxul.so+0x7fd3356)
#11 core::iter::traits::iterator::Iterator::all::h45977cadf7490dd9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2349:9 (libxul.so+0x7fd3356)
#12 selectors::matching::matches_compound_selector::h19f6008c9c5db0c3 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:642:5 (libxul.so+0x7fd3356)
#13 selectors::matching::matches_complex_selector_internal::h615aa9e1162c23d1 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:475:37 (libxul.so+0x7fd3356)
#14 selectors::matching::matches_complex_selector_internal::_$u7b$$u7b$closure$u7d$$u7d$::h28c915dd066428ee /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:529:13 (libxul.so+0x7fd3834)
#15 selectors::context::MatchingContext$LT$Impl$GT$::with_visited_handling_mode::he72c7db8fbf4113d /builds/worker/checkouts/gecko/servo/components/selectors/context.rs:265:22 (libxul.so+0x7fd3834)
#16 selectors::matching::matches_complex_selector_internal::h615aa9e1162c23d1 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:528:22 (libxul.so+0x7fd3834)
#17 selectors::matching::matches_complex_selector::h26059c8afb4ad5af /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:335:9 (libxul.so+0x7fb1a34)
#18 selectors::matching::matches_selector::h8f3f3ae8b23cd063 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:206:5 (libxul.so+0x7fb1a34)
#19 style::stylist::Stylist::match_revalidation_selectors::_$u7b$$u7b$closure$u7d$$u7d$::hee6ce8c7cb697285 /builds/worker/checkouts/gecko/servo/components/style/stylist.rs:1455:34 (libxul.so+0x7fb1a34)
#20 style::selector_map::SelectorMap$LT$T$GT$::lookup::hcf3f26e61c6b921a /builds/worker/checkouts/gecko/servo/components/style/selector_map.rs:518:17 (libxul.so+0x7f9b240)
#21 style::stylist::Stylist::match_revalidation_selectors::h539bde2c89086903 /builds/worker/checkouts/gecko/servo/components/style/stylist.rs:1451:13 (libxul.so+0x7f9b240)
#22 style::sharing::ValidationData::revalidation_match_results::_$u7b$$u7b$closure$u7d$$u7d$::h5bc79428af4caa8c /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:256:13 (libxul.so+0x7f9b240)
#23 core::option::Option$LT$T$GT$::get_or_insert_with::hf6885bfa72aacf6d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/option.rs:1487:49 (libxul.so+0x7f9b240)
#24 style::sharing::ValidationData::revalidation_match_results::h9e34c33deada29ca /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:239:9 (libxul.so+0x7f9b240)
#25 style::sharing::StyleSharingTarget$LT$E$GT$::revalidation_match_results::hd120e5beb23a49a0 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:409:9 (libxul.so+0x7f9b240)
#26 style::sharing::checks::revalidate::h8267b23373f7677e /builds/worker/checkouts/gecko/servo/components/style/sharing/checks.rs:131:9 (libxul.so+0x7f9b240)
#27 style::sharing::StyleSharingCache$LT$E$GT$::test_candidate::hf5bac974a766a60d /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:814:13 (libxul.so+0x7f9b240)
#28 style::sharing::StyleSharingCache$LT$E$GT$::share_style_if_possible::_$u7b$$u7b$closure$u7d$$u7d$::h2e4183c92abcd136 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:697:13 (libxul.so+0x7f9b240)
#29 uluru::LRUCache$LT$A$GT$::lookup::h3d4edaa650df9d51 /builds/worker/checkouts/gecko/third_party/rust/uluru/lib.rs:141:30 (libxul.so+0x7f9b240)
#30 style::sharing::StyleSharingCache$LT$E$GT$::share_style_if_possible::h0f54f496fd45dc80 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:696:9 (libxul.so+0x7f9b240)
#31 style::sharing::StyleSharingTarget$LT$E$GT$::share_style_if_possible::hff1f013533f155c6 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:444:9 (libxul.so+0x7f9b240)
#32 style::traversal::compute_style::hc6cbd20c1fc6955b /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:586:19 (libxul.so+0x7f9b240)
#33 style::traversal::recalc_style_at::h825868bd8f2fc4a8 /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:420:37 (libxul.so+0x7fa9ab7)
#34 _$LT$style..gecko..traversal..RecalcStyleOnly$u20$as$u20$style..traversal..DomTraversal$LT$style..gecko..wrapper..GeckoElement$GT$$GT$::process_preorder::h51801bb01cb7fb03 /builds/worker/checkouts/gecko/servo/components/style/gecko/traversal.rs:37:13 (libxul.so+0x7fa9ab7)
#35 style::parallel::top_down_dom::h3d12f5fd6fdb9f63 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:197:13 (libxul.so+0x7fa9561)
#36 style::parallel::traverse_nodes::_$u7b$$u7b$closure$u7d$$u7d$::h25ccac476fbf0260 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:282:17 (libxul.so+0x7fa9561)
#37 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h724c9324c074379c /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:47 (libxul.so+0x7fa9561)
#38 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::hb92fb87058eeb32f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fa9561)
#39 std::panicking::try::do_call::hd79f2cd18775379f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fa9561)
#40 std::panicking::try::h835bb2e86967a2c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fa9561)
#41 std::panic::catch_unwind::h43a1743956601189 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fa9561)
#42 rayon_core::unwind::halt_unwinding::h5129718133a90d9f /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fa9561)
#43 rayon_core::scope::ScopeBase::execute_job_closure::hbb790bb983272014 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:650:15 (libxul.so+0x7fa9561)
#44 rayon_core::scope::ScopeBase::execute_job::hcc0a316691188b80 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:640:29 (libxul.so+0x7fa9561)
#45 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::he6a9965468186353 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:17 (libxul.so+0x7fa9561)
#46 _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::h0b56642f7c0a45d9 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:167:9 (libxul.so+0x7fa9561)
#47 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0x8490ee2)
#48 _$LT$rayon_core..job..JobFifo$u20$as$u20$rayon_core..job..Job$GT$::execute::hf53ee5392bdd888d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:211:50 (libxul.so+0x8490ee2)
#49 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0xaadf85)
#50 rayon_core::registry::WorkerThread::execute::h8c4331d7525412a4 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:749:9 (libxul.so+0xaadf85)
#51 rayon_core::registry::WorkerThread::wait_until_cold::h8ae159f27c00d846 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:726:17 (libxul.so+0xaadf85)
#52 rayon_core::registry::WorkerThread::wait_until::h4f2932e4eec36717 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:700:13 (libxul.so+0x7fa0ba0)
#53 rayon_core::scope::ScopeLatch::wait::h1daae6e910e061a0 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:730:17 (libxul.so+0x7fa0ba0)
#54 rayon_core::scope::ScopeBase::complete::h9a360ce75c28b812 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:629:9 (libxul.so+0x7fa0ba0)
#55 rayon_core::scope::scope_fifo::_$u7b$$u7b$closure$u7d$$u7d$::h6a03f3ba8ae46c47 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:401:9 (libxul.so+0x7fa0ba0)
#56 rayon_core::registry::in_worker::h529c335fa954e422 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:875:13 (libxul.so+0x7fad99d)
#57 rayon_core::scope::scope_fifo::h3abb89f7fef75831 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:399:5 (libxul.so+0x7fad99d)
#58 rayon_core::thread_pool::ThreadPool::scope_fifo::_$u7b$$u7b$closure$u7d$$u7d$::h999bd4e616499d92 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:222:25 (libxul.so+0x7fad99d)
#59 rayon_core::thread_pool::ThreadPool::install::_$u7b$$u7b$closure$u7d$$u7d$::hdbd54c2460dc3a15 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:111:40 (libxul.so+0x7fad99d)
#60 rayon_core::registry::Registry::in_worker_cold::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h3154a361c5cfdb78 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:465:21 (libxul.so+0x7fad99d)
#61 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::call::_$u7b$$u7b$closure$u7d$$u7d$::hbb723f6923e1eabb /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:113:21 (libxul.so+0x7fad99d)
#62 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha42a1e929788e3e4 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fad99d)
#63 std::panicking::try::do_call::h1c0052579ba59a32 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fad99d)
#64 std::panicking::try::hf49e8cf21ceb465c /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fad99d)
#65 std::panic::catch_unwind::h2911207866cc97ed /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fad99d)
#66 rayon_core::unwind::halt_unwinding::h6e1302345f44a65d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fad99d)
#67 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::hc9dec13237015d84 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:119:38 (libxul.so+0x7fad99d)
#68 rayon_core::registry::in_worker::h529c335fa954e422 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:875:13 (libxul.so+0x7fad99d)
#69 rayon_core::scope::scope_fifo::h3abb89f7fef75831 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:399:5 (libxul.so+0x7fad99d)
#70 rayon_core::thread_pool::ThreadPool::scope_fifo::_$u7b$$u7b$closure$u7d$$u7d$::h999bd4e616499d92 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:222:25 (libxul.so+0x7fad99d)
#71 rayon_core::thread_pool::ThreadPool::install::_$u7b$$u7b$closure$u7d$$u7d$::hdbd54c2460dc3a15 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:111:40 (libxul.so+0x7fad99d)
#72 rayon_core::registry::Registry::in_worker_cold::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h3154a361c5cfdb78 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:465:21 (libxul.so+0x7fad99d)
#73 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::call::_$u7b$$u7b$closure$u7d$$u7d$::hbb723f6923e1eabb /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:113:21 (libxul.so+0x7fad99d)
#74 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha42a1e929788e3e4 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fad99d)
#75 std::panicking::try::do_call::h1c0052579ba59a32 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fad99d)
#76 std::panicking::try::hf49e8cf21ceb465c /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fad99d)
#77 std::panic::catch_unwind::h2911207866cc97ed /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fad99d)
#78 rayon_core::unwind::halt_unwinding::h6e1302345f44a65d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fad99d)
#79 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::hc9dec13237015d84 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:119:38 (libxul.so+0x7fad99d)
#80 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0xaadf85)
#81 rayon_core::registry::WorkerThread::execute::h8c4331d7525412a4 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:749:9 (libxul.so+0xaadf85)
#82 rayon_core::registry::WorkerThread::wait_until_cold::h8ae159f27c00d846 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:726:17 (libxul.so+0xaadf85)
#83 rayon_core::registry::WorkerThread::wait_until::h4f2932e4eec36717 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:700:13 (libxul.so+0x8493f92)
#84 rayon_core::registry::main_loop::h0e37a2d4fe2032df /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:833:5 (libxul.so+0x8493f92)
#85 rayon_core::registry::ThreadBuilder::run::h6e628b264653257a /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:55:18 (libxul.so+0x8493f92)
#86 _$LT$rayon_core..registry..DefaultSpawn$u20$as$u20$rayon_core..registry..ThreadSpawn$GT$::spawn::_$u7b$$u7b$closure$u7d$$u7d$::h513e75fe6b3391c0 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:100:20 (libxul.so+0x8493f92)
#87 std::sys_common::backtrace::__rust_begin_short_backtrace::h5b42f8bbb8fe5c10 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:123:18 (libxul.so+0x8493f92)
#88 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#89 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#90 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#91 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#92 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#93 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#94 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#95 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#96 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#97 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#98 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#99 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#100 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#101 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#102 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h6101b21655d0709f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#103 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h314b9b19f4338a45 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#104 std::sys::unix::thread::Thread::new::thread_start::h31f5f540df5473d8 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys/unix/thread.rs:108:17 (libxul.so+0x859cd66)
```
Bug 1758223 Comment 0 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Found while fuzzing m-c 20220304-b01b8627f45f (--enable-thread-sanitizer --enable-fuzzing)
To reproduce via Grizzly Replay:
```
$ pip install fuzzfetch grizzly-framework
$ python -m fuzzfetch -t --fuzzing -n firefox
$ python -m grizzly.replay ./firefox/firefox testcase.html --repeat 10 --no-harness
```
The test case is not 100% relaible but I can usually get it to repro within 6 attempts.
```
WARNING: ThreadSanitizer: data race (pid=30010)
Write of size 4 at 0x7b6c0000b618 by thread T17:
#0 UnsetFlags /builds/worker/workspace/obj-build/dist/include/nsWrapperCache.h:285:12 (libxul.so+0x5027044)
#1 UnsetFlags /builds/worker/checkouts/gecko/dom/base/nsINode.h:1318:21 (libxul.so+0x5027044)
#2 Gecko_UnsetNodeFlags /builds/worker/checkouts/gecko/layout/style/GeckoBindings.cpp:270:32 (libxul.so+0x5027044)
#3 style::gecko::wrapper::GeckoElement::unset_flags::hd2bae9c72374eb89 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:667:9 (libxul.so+0x7f9f17f)
#4 _$LT$style..gecko..wrapper..GeckoElement$u20$as$u20$style..dom..TElement$GT$::clear_descendant_bits::h5c3cdbd8d552d2f2 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:1428:9 (libxul.so+0x7f9f17f)
#5 style::traversal::clear_descendant_data::hfd438933a014a9cd /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:851:5 (libxul.so+0x7f9f17f)
#6 style::traversal::recalc_style_at::h825868bd8f2fc4a8 /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:440:17 (libxul.so+0x7fa9b3b)
#7 _$LT$style..gecko..traversal..RecalcStyleOnly$u20$as$u20$style..traversal..DomTraversal$LT$style..gecko..wrapper..GeckoElement$GT$$GT$::process_preorder::h51801bb01cb7fb03 /builds/worker/checkouts/gecko/servo/components/style/gecko/traversal.rs:37:13 (libxul.so+0x7fa9b3b)
#8 style::traversal::recalc_style_at::h825868bd8f2fc4a8 /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:440:17 (libxul.so+0x7fa9b3b)
#9 _$LT$style..gecko..traversal..RecalcStyleOnly$u20$as$u20$style..traversal..DomTraversal$LT$style..gecko..wrapper..GeckoElement$GT$$GT$::process_preorder::h51801bb01cb7fb03 /builds/worker/checkouts/gecko/servo/components/style/gecko/traversal.rs:37:13 (libxul.so+0x7fa9b3b)
#10 style::parallel::top_down_dom::h3d12f5fd6fdb9f63 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:197:13 (libxul.so+0x7fa9561)
#11 style::parallel::traverse_nodes::_$u7b$$u7b$closure$u7d$$u7d$::h25ccac476fbf0260 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:282:17 (libxul.so+0x7fa9561)
#12 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h724c9324c074379c /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:47 (libxul.so+0x7fa9561)
#13 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::hb92fb87058eeb32f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fa9561)
#14 std::panicking::try::do_call::hd79f2cd18775379f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fa9561)
#15 std::panicking::try::h835bb2e86967a2c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fa9561)
#16 std::panic::catch_unwind::h43a1743956601189 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fa9561)
#17 rayon_core::unwind::halt_unwinding::h5129718133a90d9f /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fa9561)
#18 rayon_core::scope::ScopeBase::execute_job_closure::hbb790bb983272014 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:650:15 (libxul.so+0x7fa9561)
#19 rayon_core::scope::ScopeBase::execute_job::hcc0a316691188b80 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:640:29 (libxul.so+0x7fa9561)
#20 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::he6a9965468186353 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:17 (libxul.so+0x7fa9561)
#21 _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::h0b56642f7c0a45d9 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:167:9 (libxul.so+0x7fa9561)
#22 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0x8490ee2)
#23 _$LT$rayon_core..job..JobFifo$u20$as$u20$rayon_core..job..Job$GT$::execute::hf53ee5392bdd888d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:211:50 (libxul.so+0x8490ee2)
#24 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0xaadf85)
#25 rayon_core::registry::WorkerThread::execute::h8c4331d7525412a4 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:749:9 (libxul.so+0xaadf85)
#26 rayon_core::registry::WorkerThread::wait_until_cold::h8ae159f27c00d846 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:726:17 (libxul.so+0xaadf85)
#27 rayon_core::registry::WorkerThread::wait_until::h4f2932e4eec36717 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:700:13 (libxul.so+0x8493f92)
#28 rayon_core::registry::main_loop::h0e37a2d4fe2032df /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:833:5 (libxul.so+0x8493f92)
#29 rayon_core::registry::ThreadBuilder::run::h6e628b264653257a /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:55:18 (libxul.so+0x8493f92)
#30 _$LT$rayon_core..registry..DefaultSpawn$u20$as$u20$rayon_core..registry..ThreadSpawn$GT$::spawn::_$u7b$$u7b$closure$u7d$$u7d$::h513e75fe6b3391c0 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:100:20 (libxul.so+0x8493f92)
#31 std::sys_common::backtrace::__rust_begin_short_backtrace::h5b42f8bbb8fe5c10 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:123:18 (libxul.so+0x8493f92)
#32 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#33 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#34 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#35 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#36 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#37 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#38 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#39 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#40 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#41 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#42 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#43 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#44 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#45 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#46 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h6101b21655d0709f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#47 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h314b9b19f4338a45 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#48 std::sys::unix::thread::Thread::new::thread_start::h31f5f540df5473d8 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys/unix/thread.rs:108:17 (libxul.so+0x859cd66)
Previous read of size 4 at 0x7b6c0000b618 by thread T15:
#0 style::gecko::wrapper::GeckoNode::flags::h4ccef17399009190 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:275:9 (libxul.so+0x7fd4232)
#1 style::gecko::wrapper::GeckoElement::flags::hdef176f51d25aeb9 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:653:9 (libxul.so+0x7fd4232)
#2 style::gecko::wrapper::GeckoElement::is_root_of_native_anonymous_subtree::hd1b943b383b5f0b7 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:805:16 (libxul.so+0x7fd4232)
#3 _$LT$style..gecko..wrapper..GeckoElement$u20$as$u20$selectors..tree..Element$GT$::ignores_nth_child_selectors::ha80627117a236f22 /builds/worker/checkouts/gecko/servo/components/style/gecko/wrapper.rs:2283:9 (libxul.so+0x7fd4232)
#4 selectors::matching::matches_generic_nth_child::h3d3f3e13670ddd13 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:887:8 (libxul.so+0x7fd4232)
#5 selectors::matching::matches_simple_selector::h31078e5982a516b9 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:839:13 (libxul.so+0x7fd4232)
#6 selectors::matching::matches_compound_selector::_$u7b$$u7b$closure$u7d$$u7d$::hac3607d579d3293e /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:644:23 (libxul.so+0x7fd3356)
#7 core::iter::traits::iterator::Iterator::all::check::_$u7b$$u7b$closure$u7d$$u7d$::h444da473ecf06355 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2346:20 (libxul.so+0x7fd3356)
#8 core::ops::function::impls::_$LT$impl$u20$core..ops..function..FnMut$LT$A$GT$$u20$for$u20$$RF$mut$u20$F$GT$::call_mut::h055a8fc2c9e689c2 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:269:13 (libxul.so+0x7fd3356)
#9 core::iter::traits::iterator::Iterator::try_fold::h25172faa366da34f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:1995:21 (libxul.so+0x7fd3356)
#10 _$LT$core..iter..adapters..chain..Chain$LT$A$C$B$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h300b41a723a07a03 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/adapters/chain.rs:104:19 (libxul.so+0x7fd3356)
#11 core::iter::traits::iterator::Iterator::all::h45977cadf7490dd9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/iter/traits/iterator.rs:2349:9 (libxul.so+0x7fd3356)
#12 selectors::matching::matches_compound_selector::h19f6008c9c5db0c3 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:642:5 (libxul.so+0x7fd3356)
#13 selectors::matching::matches_complex_selector_internal::h615aa9e1162c23d1 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:475:37 (libxul.so+0x7fd3356)
#14 selectors::matching::matches_complex_selector_internal::_$u7b$$u7b$closure$u7d$$u7d$::h28c915dd066428ee /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:529:13 (libxul.so+0x7fd3834)
#15 selectors::context::MatchingContext$LT$Impl$GT$::with_visited_handling_mode::he72c7db8fbf4113d /builds/worker/checkouts/gecko/servo/components/selectors/context.rs:265:22 (libxul.so+0x7fd3834)
#16 selectors::matching::matches_complex_selector_internal::h615aa9e1162c23d1 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:528:22 (libxul.so+0x7fd3834)
#17 selectors::matching::matches_complex_selector::h26059c8afb4ad5af /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:335:9 (libxul.so+0x7fb1a34)
#18 selectors::matching::matches_selector::h8f3f3ae8b23cd063 /builds/worker/checkouts/gecko/servo/components/selectors/matching.rs:206:5 (libxul.so+0x7fb1a34)
#19 style::stylist::Stylist::match_revalidation_selectors::_$u7b$$u7b$closure$u7d$$u7d$::hee6ce8c7cb697285 /builds/worker/checkouts/gecko/servo/components/style/stylist.rs:1455:34 (libxul.so+0x7fb1a34)
#20 style::selector_map::SelectorMap$LT$T$GT$::lookup::hcf3f26e61c6b921a /builds/worker/checkouts/gecko/servo/components/style/selector_map.rs:518:17 (libxul.so+0x7f9b240)
#21 style::stylist::Stylist::match_revalidation_selectors::h539bde2c89086903 /builds/worker/checkouts/gecko/servo/components/style/stylist.rs:1451:13 (libxul.so+0x7f9b240)
#22 style::sharing::ValidationData::revalidation_match_results::_$u7b$$u7b$closure$u7d$$u7d$::h5bc79428af4caa8c /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:256:13 (libxul.so+0x7f9b240)
#23 core::option::Option$LT$T$GT$::get_or_insert_with::hf6885bfa72aacf6d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/option.rs:1487:49 (libxul.so+0x7f9b240)
#24 style::sharing::ValidationData::revalidation_match_results::h9e34c33deada29ca /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:239:9 (libxul.so+0x7f9b240)
#25 style::sharing::StyleSharingTarget$LT$E$GT$::revalidation_match_results::hd120e5beb23a49a0 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:409:9 (libxul.so+0x7f9b240)
#26 style::sharing::checks::revalidate::h8267b23373f7677e /builds/worker/checkouts/gecko/servo/components/style/sharing/checks.rs:131:9 (libxul.so+0x7f9b240)
#27 style::sharing::StyleSharingCache$LT$E$GT$::test_candidate::hf5bac974a766a60d /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:814:13 (libxul.so+0x7f9b240)
#28 style::sharing::StyleSharingCache$LT$E$GT$::share_style_if_possible::_$u7b$$u7b$closure$u7d$$u7d$::h2e4183c92abcd136 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:697:13 (libxul.so+0x7f9b240)
#29 uluru::LRUCache$LT$A$GT$::lookup::h3d4edaa650df9d51 /builds/worker/checkouts/gecko/third_party/rust/uluru/lib.rs:141:30 (libxul.so+0x7f9b240)
#30 style::sharing::StyleSharingCache$LT$E$GT$::share_style_if_possible::h0f54f496fd45dc80 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:696:9 (libxul.so+0x7f9b240)
#31 style::sharing::StyleSharingTarget$LT$E$GT$::share_style_if_possible::hff1f013533f155c6 /builds/worker/checkouts/gecko/servo/components/style/sharing/mod.rs:444:9 (libxul.so+0x7f9b240)
#32 style::traversal::compute_style::hc6cbd20c1fc6955b /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:586:19 (libxul.so+0x7f9b240)
#33 style::traversal::recalc_style_at::h825868bd8f2fc4a8 /builds/worker/checkouts/gecko/servo/components/style/traversal.rs:420:37 (libxul.so+0x7fa9ab7)
#34 _$LT$style..gecko..traversal..RecalcStyleOnly$u20$as$u20$style..traversal..DomTraversal$LT$style..gecko..wrapper..GeckoElement$GT$$GT$::process_preorder::h51801bb01cb7fb03 /builds/worker/checkouts/gecko/servo/components/style/gecko/traversal.rs:37:13 (libxul.so+0x7fa9ab7)
#35 style::parallel::top_down_dom::h3d12f5fd6fdb9f63 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:197:13 (libxul.so+0x7fa9561)
#36 style::parallel::traverse_nodes::_$u7b$$u7b$closure$u7d$$u7d$::h25ccac476fbf0260 /builds/worker/checkouts/gecko/servo/components/style/parallel.rs:282:17 (libxul.so+0x7fa9561)
#37 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h724c9324c074379c /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:47 (libxul.so+0x7fa9561)
#38 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::hb92fb87058eeb32f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fa9561)
#39 std::panicking::try::do_call::hd79f2cd18775379f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fa9561)
#40 std::panicking::try::h835bb2e86967a2c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fa9561)
#41 std::panic::catch_unwind::h43a1743956601189 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fa9561)
#42 rayon_core::unwind::halt_unwinding::h5129718133a90d9f /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fa9561)
#43 rayon_core::scope::ScopeBase::execute_job_closure::hbb790bb983272014 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:650:15 (libxul.so+0x7fa9561)
#44 rayon_core::scope::ScopeBase::execute_job::hcc0a316691188b80 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:640:29 (libxul.so+0x7fa9561)
#45 rayon_core::scope::ScopeFifo::spawn_fifo::_$u7b$$u7b$closure$u7d$$u7d$::he6a9965468186353 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:585:17 (libxul.so+0x7fa9561)
#46 _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::h0b56642f7c0a45d9 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:167:9 (libxul.so+0x7fa9561)
#47 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0x8490ee2)
#48 _$LT$rayon_core..job..JobFifo$u20$as$u20$rayon_core..job..Job$GT$::execute::hf53ee5392bdd888d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:211:50 (libxul.so+0x8490ee2)
#49 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0xaadf85)
#50 rayon_core::registry::WorkerThread::execute::h8c4331d7525412a4 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:749:9 (libxul.so+0xaadf85)
#51 rayon_core::registry::WorkerThread::wait_until_cold::h8ae159f27c00d846 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:726:17 (libxul.so+0xaadf85)
#52 rayon_core::registry::WorkerThread::wait_until::h4f2932e4eec36717 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:700:13 (libxul.so+0x7fa0ba0)
#53 rayon_core::scope::ScopeLatch::wait::h1daae6e910e061a0 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:730:17 (libxul.so+0x7fa0ba0)
#54 rayon_core::scope::ScopeBase::complete::h9a360ce75c28b812 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:629:9 (libxul.so+0x7fa0ba0)
#55 rayon_core::scope::scope_fifo::_$u7b$$u7b$closure$u7d$$u7d$::h6a03f3ba8ae46c47 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:401:9 (libxul.so+0x7fa0ba0)
#56 rayon_core::registry::in_worker::h529c335fa954e422 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:875:13 (libxul.so+0x7fad99d)
#57 rayon_core::scope::scope_fifo::h3abb89f7fef75831 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:399:5 (libxul.so+0x7fad99d)
#58 rayon_core::thread_pool::ThreadPool::scope_fifo::_$u7b$$u7b$closure$u7d$$u7d$::h999bd4e616499d92 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:222:25 (libxul.so+0x7fad99d)
#59 rayon_core::thread_pool::ThreadPool::install::_$u7b$$u7b$closure$u7d$$u7d$::hdbd54c2460dc3a15 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:111:40 (libxul.so+0x7fad99d)
#60 rayon_core::registry::Registry::in_worker_cold::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h3154a361c5cfdb78 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:465:21 (libxul.so+0x7fad99d)
#61 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::call::_$u7b$$u7b$closure$u7d$$u7d$::hbb723f6923e1eabb /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:113:21 (libxul.so+0x7fad99d)
#62 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha42a1e929788e3e4 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fad99d)
#63 std::panicking::try::do_call::h1c0052579ba59a32 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fad99d)
#64 std::panicking::try::hf49e8cf21ceb465c /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fad99d)
#65 std::panic::catch_unwind::h2911207866cc97ed /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fad99d)
#66 rayon_core::unwind::halt_unwinding::h6e1302345f44a65d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fad99d)
#67 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::hc9dec13237015d84 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:119:38 (libxul.so+0x7fad99d)
#68 rayon_core::registry::in_worker::h529c335fa954e422 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:875:13 (libxul.so+0x7fad99d)
#69 rayon_core::scope::scope_fifo::h3abb89f7fef75831 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/scope/mod.rs:399:5 (libxul.so+0x7fad99d)
#70 rayon_core::thread_pool::ThreadPool::scope_fifo::_$u7b$$u7b$closure$u7d$$u7d$::h999bd4e616499d92 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:222:25 (libxul.so+0x7fad99d)
#71 rayon_core::thread_pool::ThreadPool::install::_$u7b$$u7b$closure$u7d$$u7d$::hdbd54c2460dc3a15 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/thread_pool/mod.rs:111:40 (libxul.so+0x7fad99d)
#72 rayon_core::registry::Registry::in_worker_cold::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h3154a361c5cfdb78 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:465:21 (libxul.so+0x7fad99d)
#73 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::call::_$u7b$$u7b$closure$u7d$$u7d$::hbb723f6923e1eabb /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:113:21 (libxul.so+0x7fad99d)
#74 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha42a1e929788e3e4 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x7fad99d)
#75 std::panicking::try::do_call::h1c0052579ba59a32 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x7fad99d)
#76 std::panicking::try::hf49e8cf21ceb465c /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x7fad99d)
#77 std::panic::catch_unwind::h2911207866cc97ed /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x7fad99d)
#78 rayon_core::unwind::halt_unwinding::h6e1302345f44a65d /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/unwind.rs:17:5 (libxul.so+0x7fad99d)
#79 _$LT$rayon_core..job..StackJob$LT$L$C$F$C$R$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::hc9dec13237015d84 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:119:38 (libxul.so+0x7fad99d)
#80 rayon_core::job::JobRef::execute::ha00d7b41915f03ba /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/job.rs:59:9 (libxul.so+0xaadf85)
#81 rayon_core::registry::WorkerThread::execute::h8c4331d7525412a4 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:749:9 (libxul.so+0xaadf85)
#82 rayon_core::registry::WorkerThread::wait_until_cold::h8ae159f27c00d846 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:726:17 (libxul.so+0xaadf85)
#83 rayon_core::registry::WorkerThread::wait_until::h4f2932e4eec36717 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:700:13 (libxul.so+0x8493f92)
#84 rayon_core::registry::main_loop::h0e37a2d4fe2032df /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:833:5 (libxul.so+0x8493f92)
#85 rayon_core::registry::ThreadBuilder::run::h6e628b264653257a /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:55:18 (libxul.so+0x8493f92)
#86 _$LT$rayon_core..registry..DefaultSpawn$u20$as$u20$rayon_core..registry..ThreadSpawn$GT$::spawn::_$u7b$$u7b$closure$u7d$$u7d$::h513e75fe6b3391c0 /builds/worker/checkouts/gecko/third_party/rust/rayon-core/src/registry.rs:100:20 (libxul.so+0x8493f92)
#87 std::sys_common::backtrace::__rust_begin_short_backtrace::h5b42f8bbb8fe5c10 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys_common/backtrace.rs:123:18 (libxul.so+0x8493f92)
#88 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#89 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#90 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#91 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#92 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#93 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#94 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#95 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::hd3efae066518b3c0 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:477:17 (libxul.so+0x849329a)
#96 _$LT$core..panic..unwind_safe..AssertUnwindSafe$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$$LP$$RP$$GT$$GT$::call_once::ha9734dfcf115a1c3 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:271:9 (libxul.so+0x849329a)
#97 std::panicking::try::do_call::h088f763b944c364d /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:406:40 (libxul.so+0x849329a)
#98 std::panicking::try::h3ce8a139501ab2b5 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panicking.rs:370:19 (libxul.so+0x849329a)
#99 std::panic::catch_unwind::h4ea047cc4ce4e994 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/panic.rs:133:14 (libxul.so+0x849329a)
#100 std::thread::Builder::spawn_unchecked::_$u7b$$u7b$closure$u7d$$u7d$::hc2727fcc81bb73c9 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/thread/mod.rs:476:30 (libxul.so+0x849329a)
#101 core::ops::function::FnOnce::call_once$u7b$$u7b$vtable.shim$u7d$$u7d$::h22e0b9858f3cb25e /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/core/src/ops/function.rs:227:5 (libxul.so+0x849329a)
#102 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h6101b21655d0709f /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#103 _$LT$alloc..boxed..Box$LT$F$C$A$GT$$u20$as$u20$core..ops..function..FnOnce$LT$Args$GT$$GT$::call_once::h314b9b19f4338a45 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1854:9 (libxul.so+0x859cd66)
#104 std::sys::unix::thread::Thread::new::thread_start::h31f5f540df5473d8 /builds/worker/fetches/rustc/lib/rustlib/src/rust/library/std/src/sys/unix/thread.rs:108:17 (libxul.so+0x859cd66)
```