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Sign upassertion failed (!global.is_null()) during Promise destructor after navigation #18651
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This is a more minimized testcase: <audio></audio>
<script>
document.querySelector("audio").play();
location.reload();
</script> |
jdm
changed the title
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The way to solve this would be to have a different way of obtaining the JSContext in the Promise destructor. Maybe we couold add a ScriptThread API for it. |
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I'm on it. |
bors-servo
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Mar 15, 2018
Don't access the reflector when dropping a Promise (fixes #18651) The reflector may be dead already. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20305) <!-- Reviewable:end -->
pmocher
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Mar 30, 2018
# This is the 1st commit message: Don't access the reflector when dropping a Promise (fixes servo#18651) The reflector may be dead already. # This is the commit message servo#2: Run automated test for memory report charter. # This is the commit message servo#3: Run memory charting test on CI. # This is the commit message servo#4: Move the TravisCI test to the quick group. # This is the commit message servo#5: Add timeout pref to the mozilla/worklets wpt tests # This is the commit message servo#6: Added .ini for test_paint_worklet_timeout.html # This is the commit message servo#7: Update the in-tree status of WPT syncing. # This is the commit message servo#8: refactor(window): reference winit where applicable - relates with servo#20299 # This is the commit message servo#9: Update mozangle to 0.1.6. # This is the commit message servo#10: Update to handle WebRender API changes Items now only take a clipping rectangle instead of a LocalClip. # This is the commit message servo#11: Update WR (local clip API change, texture cache optimizations). # This is the commit message servo#12: Update the MULTIPROCESS static when changing default options # This is the commit message servo#13: Add Windows support to the --nightly | -n flag. # This is the commit message servo#14: build(cargo): enable webrender capture feature # This is the commit message servo#15: feat(windowevent): expose CaptureWebRender event # This is the commit message servo#16: feat(window): bind hotkey to trigger capture event # This is the commit message servo#17: Avoid using WPT test runner to update the test manifest. # This is the commit message servo#18: Use typed coordinates. We use Size2D and Point2D across compositing, constellation and script, losing the type of pixels we use (DevicePixel, DeviceIndepententPixel or CSSPixel) along the way, which might lead to bugs like window.outerHeight not taking into account the page zoom (using DeviceIndepententPixel instead of CSSPixel). # This is the commit message servo#19: alias some euclid types # This is the commit message servo#20: remove WindowMethods::size() # This is the commit message servo#21: Remove update-manifest argument that is no longer valid. # This is the commit message servo#22: Update web-platform-tests to revision e87f38097902e16348d4e17f4fe3bc2d0112bff1 # This is the commit message servo#23: Add icon to servo.exe # This is the commit message servo#24: Use mozjs 0.3 fork without Heap::new # This is the commit message servo#25: Root JS object members in dictionaries # This is the commit message servo#26: Root `any` members in dictionaries # This is the commit message servo#27: Add key/value iterable HTML benchmark # This is the commit message servo#28: Fix tabs # This is the commit message servo#29: Use upstream mozjs 0.3 # This is the commit message servo#30: Update WR (radial gradient optimizations). # This is the commit message servo#31: CounterBound::Integer made to store an Integer # This is the commit message servo#32: style: Remove unsound Atom From implementations. Fixes servo#20158 # This is the commit message servo#33: style: Cleanup @-moz-document parsing a bit. MozReview-Commit-ID: 7vd0BLAqM0v Bug: 1446470 Reviewed-by: xidorn # This is the commit message servo#34: style: Allow @-moz-document url-prefix() on content. MozReview-Commit-ID: zaT41fpsDT Bug: 1446470 Reviewed-by: xidorn # This is the commit message servo#35: style: Add another pref to control the url-prefix hack. MozReview-Commit-ID: D4qL0oO69Uh Bug: 1446470 Reviewed-by: xidorn # This is the commit message servo#36: style: Update bindings. # This is the commit message servo#37: Update web-platform-tests to revision 790e6601ee8b4b412b6ad9f6fde466b7ccb9cb7e # This is the commit message servo#38: style: Better Shadow DOM assertions. Bug: 1445682 Reviewed-by: xidorn Differential Revision: https://phabricator.services.mozilla.com/D748 # This is the commit message servo#39: Support memory report logs with interleaved non-report output, added automated tests # This is the commit message servo#40: Update WR revision. # This is the commit message servo#41: Add Servo_Property_IsShorthand to geckolib/glue.rs # This is the commit message servo#42: Re-expose webrender debugger feature in components/servo Update ws in debugger to 0.7.3 Update lockfile # This is the commit message servo#43: Update web-platform-tests to revision 3ec34e5a2c8cbeeb7fad521cce0daf923b272a92 # This is the commit message servo#44: Make `type` argument as optional and ignore it in open method # This is the commit message servo#45: Update steps with new spec # This is the commit message servo#46: Make type-argument.window.js test as pass # This is the commit message servo#47: Simplify GetTexParameter # This is the commit message servo#48: Simplify VertexAttribOffset # This is the commit message servo#49: Simplify BufferParameter # This is the commit message servo#50: Simplify GetShaderPrecisionFormat # This is the commit message servo#51: Update web-platform-tests to revision 3a8328470d53c4501e31cec2775c4d33821c2275 # This is the commit message servo#52: Mouse position from glutin is DevicePixel # This is the commit message servo#53: Update servo-websocket to 0.21 # This is the commit message servo#54: Bump ipc-channel and bincode This required bumping uuid too which unfortunately duplicated rand. # This is the commit message servo#55: Remove our dependency on the gcc crate # This is the commit message servo#56: Blobs support typed arrays now # This is the commit message servo#57: Bump parking_lot to 0.5 # This is the commit message servo#58: initial shot at initial steps # This is the commit message servo#59: Second shot at initial steps # This is the commit message servo#60: Progress on initial steps # This is the commit message servo#61: initial shot at initial steps
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Found with domato.
Note: It is nondeterministic how many times the crash is hit, 5 crashes is the lowest I found, while sometimes the crash was hit 15+ times before Servo died.
assertion failed: !global.is_null() (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZero(1)) }, at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611) assertion failed: !global.is_null() (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZero(3)) }, at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611) assertion failed: !global.is_null() (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZero(4)) }, at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611) assertion failed: !global.is_null() (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZero(5)) }, at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611) assertion failed: !global.is_null() (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZero(6)) }, at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611) stack backtrace: 0: 0x55cc52866374 - backtrace::backtrace::libunwind::trace at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/libunwind.rs:53 - backtrace::backtrace::trace<closure> at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42 1: 0x55cc528594df - backtrace::capture::{{impl}}::new at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64 2: 0x55cc4ca9b52e - servo::main::{{closure}} at /shared/dev/rust/servo/ports/servo/main.rs:130 3: 0x55cc53827d96 - std::panicking::rust_panic_with_hook at /checkout/src/libstd/panicking.rs:578 4: 0x55cc4e3eba65 - std::panicking::begin_panic<&str> at /checkout/src/libstd/panicking.rs:538 5: 0x55cc4e06d394 - script::dom::globalscope::global_scope_from_global at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611 6: 0x55cc4e06ae8e - script::dom::globalscope::{{impl}}::from_object at /shared/dev/rust/servo/components/script/dom/globalscope.rs:160 7: 0x55cc4e069d70 - script::dom::globalscope::{{impl}}::from_reflector<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/globalscope.rs:152 8: 0x55cc4dff06b3 - script::dom::bindings::reflector::DomObject::global<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/bindings/reflector.rs:81 9: 0x55cc4e0bb0f3 - script::dom::promise::{{impl}}::drop at /shared/dev/rust/servo/components/script/dom/promise.rs:64 10: 0x55cc4fa309b4 - core::ptr::drop_in_place<script::dom::promise::Promise> at /checkout/src/libcore/ptr.rs:61 11: 0x55cc4fa35f28 - core::ptr::drop_in_place<alloc::rc::RcBox<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 12: 0x55cc4fac9688 - alloc::rc::{{impl}}::drop<script::dom::promise::Promise> at /checkout/src/liballoc/rc.rs:791 13: 0x55cc4dacbac4 - core::ptr::drop_in_place<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 14: 0x55cc4dac6b05 - core::ptr::drop_in_place<[alloc::rc::Rc<script::dom::promise::Promise>]> at /checkout/src/libcore/ptr.rs:61 15: 0x55cc4dc73ab1 - alloc::vec::{{impl}}::drop<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/liballoc/vec.rs:2110 16: 0x55cc4e68cdb4 - core::ptr::drop_in_place<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>> at /checkout/src/libcore/ptr.rs:61 17: 0x55cc4e687264 - core::ptr::drop_in_place<core::cell::UnsafeCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 18: 0x55cc4e697698 - core::ptr::drop_in_place<core::cell::RefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 19: 0x55cc4e683124 - core::ptr::drop_in_place<script::dom::bindings::cell::DOMRefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 20: 0x55cc4e691f4f - core::ptr::drop_in_place<script::dom::htmlmediaelement::HTMLMediaElement> at /checkout/src/libcore/ptr.rs:61 21: 0x55cc4e6814d4 - core::ptr::drop_in_place<script::dom::htmlaudioelement::HTMLAudioElement> at /checkout/src/libcore/ptr.rs:61 22: 0x55cc4e6793d7 - core::ptr::drop_in_place<alloc::boxed::Box<script::dom::htmlaudioelement::HTMLAudioElement>> at /checkout/src/libcore/ptr.rs:61 23: 0x55cc4e8ce473 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize::{{closure}} at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:486 24: 0x55cc4e66dd4c - core::ops::function::FnOnce::call_once<closure,()> at /checkout/src/libcore/ops/function.rs:223 25: 0x55cc4e2ff24c - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 26: 0x55cc4e5aa139 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 27: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 28: 0x55cc4e47f84a - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 29: 0x55cc4e3c7523 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 30: 0x55cc4f741d79 - js::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,()> at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/panic.rs:22 31: 0x55cc4e1f3178 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:481 32: 0x55cc52f78b65 - _ZNK2js5Class10doFinalizeEPNS_6FreeOpEP8JSObject at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Class.h:815 33: 0x55cc52f81342 - _ZN8JSObject8finalizeEPN2js6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsobjinlines.h:85 34: 0x55cc52f9b5dd - _ZN2js2gc5Arena8finalizeI8JSObjectEEmPNS_6FreeOpENS0_9AllocKindEm 35: 0x55cc52f6f861 - FinalizeTypedArenas<JSObject> at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:505 36: 0x55cc52f3d12c - FinalizeArenas at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:539 37: 0x55cc52f83b88 - _ZN2js2gc10ArenaLists16forceFinalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 38: 0x55cc52f83a31 - _ZN2js2gc10ArenaLists11finalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 39: 0x55cc52f44ac0 - _ZN2js2gc10ArenaLists30queueForegroundObjectsForSweepEPNS_6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:2839 40: 0x55cc52f4cae5 - _ZN2js2gc9GCRuntime22beginSweepingZoneGroupERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5127 41: 0x55cc52f4d23f - _ZN2js2gc9GCRuntime15beginSweepPhaseEbRNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5215 42: 0x55cc52f4faaa - _ZN2js2gc9GCRuntime23incrementalCollectSliceERNS_11SliceBudgetEN2JS8gcreason6ReasonERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5937 43: 0x55cc52f5060a - _ZN2js2gc9GCRuntime7gcCycleEbRNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6174 44: 0x55cc52f50b4b - _ZN2js2gc9GCRuntime7collectEbNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6287 45: 0x55cc52f50eda - _ZN2js2gc9GCRuntime2gcE18JSGCInvocationKindN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6354 46: 0x55cc531a64dd - _ZN9JSRuntime14destroyRuntimeEv at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/vm/Runtime.cpp:430 47: 0x55cc52ef0693 - _ZN9JSContextD2Ev at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:892 48: 0x55cc52f047c0 - js_delete_poison<JSContext> at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Utility.h:392 49: 0x55cc52eedfd3 - _ZN2js14DestroyContextEP9JSContext at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:133 50: 0x55cc52e885e3 - _Z17JS_DestroyRuntimeP9JSRuntime at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsapi.cpp:464 51: 0x55cc4fdc2d5c - js::rust::{{impl}}::drop at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/rust.rs:240 52: 0x55cc4fa29614 - core::ptr::drop_in_place<js::rust::Runtime> at /checkout/src/libcore/ptr.rs:61 53: 0x55cc4fa17b28 - core::ptr::drop_in_place<alloc::rc::RcBox<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 54: 0x55cc4fac95a8 - alloc::rc::{{impl}}::drop<js::rust::Runtime> at /checkout/src/liballoc/rc.rs:791 55: 0x55cc4f26f0f4 - core::ptr::drop_in_place<alloc::rc::Rc<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 56: 0x55cc4f2466f2 - core::ptr::drop_in_place<script::script_thread::ScriptThread> at /checkout/src/libcore/ptr.rs:61 57: 0x55cc4f4bbc60 - script::script_thread::{{impl}}::create::{{closure}} at /shared/dev/rust/servo/components/script/script_thread.rs:578 58: 0x55cc4ee0e4ba - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at /checkout/src/libstd/sys_common/backtrace.rs:136 59: 0x55cc4e3eb933 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:394 60: 0x55cc4e30ae7a - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 61: 0x55cc4e5674f2 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 62: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 63: 0x55cc4e402a6c - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 64: 0x55cc4e3a6ab5 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 65: 0x55cc4d9ab20b - std::thread::{{impl}}::spawn::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:393 66: 0x55cc4db68d13 - alloc::boxed::{{impl}}::call_box<(),closure> at /checkout/src/liballoc/boxed.rs:728 67: 0x55cc53826a1b - alloc::boxed::{{impl}}::call_once<(),()> at /checkout/src/liballoc/boxed.rs:738 - std::sys_common::thread::start_thread at /checkout/src/libstd/sys_common/thread.rs:24 - std::sys::imp::thread::{{impl}}::new::thread_start at /checkout/src/libstd/sys/unix/thread.rs:90 68: 0x7fbe4ff52493 - start_thread 69: 0x7fbe4fa7fabe - __clone 70: 0x0 - <unknown> stack backtrace: 0: 0x55cc52866374 - backtrace::backtrace::libunwind::trace at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/libunwind.rs:53 ERROR:servo: assertion failed: !global.is_null() - backtrace::backtrace::trace<closure> at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42 1: 0x55cc528594df - backtrace::capture::{{impl}}::new at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64 2: 0x55cc4ca9b52e - servo::main::{{closure}} at /shared/dev/rust/servo/ports/servo/main.rs:130 3: 0x55cc53827d96 - std::panicking::rust_panic_with_hook at /checkout/src/libstd/panicking.rs:578 4: 0x55cc4e3eba65 - std::panicking::begin_panic<&str> at /checkout/src/libstd/panicking.rs:538 5: 0x55cc4e06d394 - script::dom::globalscope::global_scope_from_global at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611 6: 0x55cc4e06ae8e - script::dom::globalscope::{{impl}}::from_object at /shared/dev/rust/servo/components/script/dom/globalscope.rs:160 7: 0x55cc4e069d70 - script::dom::globalscope::{{impl}}::from_reflector<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/globalscope.rs:152 8: 0x55cc4dff06b3 - script::dom::bindings::reflector::DomObject::global<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/bindings/reflector.rs:81 9: 0x55cc4e0bb0f3 - script::dom::promise::{{impl}}::drop at /shared/dev/rust/servo/components/script/dom/promise.rs:64 10: 0x55cc4fa309b4 - core::ptr::drop_in_place<script::dom::promise::Promise> at /checkout/src/libcore/ptr.rs:61 11: 0x55cc4fa35f28 - core::ptr::drop_in_place<alloc::rc::RcBox<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 12: 0x55cc4fac9688 - alloc::rc::{{impl}}::drop<script::dom::promise::Promise> at /checkout/src/liballoc/rc.rs:791 13: 0x55cc4dacbac4 - core::ptr::drop_in_place<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 14: 0x55cc4dac6b05 - core::ptr::drop_in_place<[alloc::rc::Rc<script::dom::promise::Promise>]> at /checkout/src/libcore/ptr.rs:61 15: 0x55cc4dc73ab1 - alloc::vec::{{impl}}::drop<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/liballoc/vec.rs:2110 16: 0x55cc4e68cdb4 - core::ptr::drop_in_place<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>> at /checkout/src/libcore/ptr.rs:61 17: 0x55cc4e687264 - core::ptr::drop_in_place<core::cell::UnsafeCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 18: 0x55cc4e697698 - core::ptr::drop_in_place<core::cell::RefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 19: 0x55cc4e683124 - core::ptr::drop_in_place<script::dom::bindings::cell::DOMRefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 20: 0x55cc4e691f4f - core::ptr::drop_in_place<script::dom::htmlmediaelement::HTMLMediaElement> at /checkout/src/libcore/ptr.rs:61 21: 0x55cc4e6814d4 - core::ptr::drop_in_place<script::dom::htmlaudioelement::HTMLAudioElement> at /checkout/src/libcore/ptr.rs:61 22: 0x55cc4e6793d7 - core::ptr::drop_in_place<alloc::boxed::Box<script::dom::htmlaudioelement::HTMLAudioElement>> at /checkout/src/libcore/ptr.rs:61 23: 0x55cc4e8ce473 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize::{{closure}} at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:486 24: 0x55cc4e66dd4c - core::ops::function::FnOnce::call_once<closure,()> at /checkout/src/libcore/ops/function.rs:223 25: 0x55cc4e2ff24c - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 26: 0x55cc4e5aa139 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 27: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 28: 0x55cc4e47f84a - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 29: 0x55cc4e3c7523 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 30: 0x55cc4f741d79 - js::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,()> at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/panic.rs:22 31: 0x55cc4e1f3178 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:481 32: 0x55cc52f78b65 - _ZNK2js5Class10doFinalizeEPNS_6FreeOpEP8JSObject at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Class.h:815 33: 0x55cc52f81342 - _ZN8JSObject8finalizeEPN2js6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsobjinlines.h:85 34: 0x55cc52f9b5dd - _ZN2js2gc5Arena8finalizeI8JSObjectEEmPNS_6FreeOpENS0_9AllocKindEm 35: 0x55cc52f6f861 - FinalizeTypedArenas<JSObject> at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:505 36: 0x55cc52f3d12c - FinalizeArenas at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:539 37: 0x55cc52f83b88 - _ZN2js2gc10ArenaLists16forceFinalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 38: 0x55cc52f83a31 - _ZN2js2gc10ArenaLists11finalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 39: 0x55cc52f44ac0 - _ZN2js2gc10ArenaLists30queueForegroundObjectsForSweepEPNS_6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:2839 40: 0x55cc52f4cae5 - _ZN2js2gc9GCRuntime22beginSweepingZoneGroupERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5127 41: 0x55cc52f4d23f - _ZN2js2gc9GCRuntime15beginSweepPhaseEbRNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5215 42: 0x55cc52f4faaa - _ZN2js2gc9GCRuntime23incrementalCollectSliceERNS_11SliceBudgetEN2JS8gcreason6ReasonERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5937 43: 0x55cc52f5060a - _ZN2js2gc9GCRuntime7gcCycleEbRNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6174 44: 0x55cc52f50b4b - _ZN2js2gc9GCRuntime7collectEbNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6287 45: 0x55cc52f50eda - _ZN2js2gc9GCRuntime2gcE18JSGCInvocationKindN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6354 46: 0x55cc531a64dd - _ZN9JSRuntime14destroyRuntimeEv at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/vm/Runtime.cpp:430 47: 0x55cc52ef0693 - _ZN9JSContextD2Ev at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:892 48: 0x55cc52f047c0 - js_delete_poison<JSContext> at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Utility.h:392 49: 0x55cc52eedfd3 - _ZN2js14DestroyContextEP9JSContext at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:133 50: 0x55cc52e885e3 - _Z17JS_DestroyRuntimeP9JSRuntime at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsapi.cpp:464 51: 0x55cc4fdc2d5c - js::rust::{{impl}}::drop at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/rust.rs:240 52: 0x55cc4fa29614 - core::ptr::drop_in_place<js::rust::Runtime> at /checkout/src/libcore/ptr.rs:61 53: 0x55cc4fa17b28 - core::ptr::drop_in_place<alloc::rc::RcBox<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 54: 0x55cc4fac95a8 - alloc::rc::{{impl}}::drop<js::rust::Runtime> at /checkout/src/liballoc/rc.rs:791 55: 0x55cc4f26f0f4 - core::ptr::drop_in_place<alloc::rc::Rc<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 56: 0x55cc4f2466f2 - core::ptr::drop_in_place<script::script_thread::ScriptThread> at /checkout/src/libcore/ptr.rs:61 57: 0x55cc4f4bbc60 - script::script_thread::{{impl}}::create::{{closure}} at /shared/dev/rust/servo/components/script/script_thread.rs:578 58: 0x55cc4ee0e4ba - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at /checkout/src/libstd/sys_common/backtrace.rs:136 59: 0x55cc4e3eb933 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:394 60: 0x55cc4e30ae7a - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 61: 0x55cc4e5674f2 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 62: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 63: 0x55cc4e402a6c - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 64: 0x55cc4e3a6ab5 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 65: 0x55cc4d9ab20b - std::thread::{{impl}}::spawn::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:393 66: 0x55cc4db68d13 - alloc::boxed::{{impl}}::call_box<(),closure> at /checkout/src/liballoc/boxed.rs:728 67: 0x55cc53826a1b - alloc::boxed::{{impl}}::call_once<(),()> at /checkout/src/liballoc/boxed.rs:738 - std::sys_common::thread::start_thread at /checkout/src/libstd/sys_common/thread.rs:24 - std::sys::imp::thread::{{impl}}::new::thread_start at /checkout/src/libstd/sys/unix/thread.rs:90 68: 0x7fbe4ff52493 - start_thread 69: 0x7fbe4fa7fabe - __clone 70: 0x0 - <unknown> stack backtrace: 0: 0x55cc52866374 - backtrace::backtrace::libunwind::trace at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/libunwind.rs:53 ERROR:servo: assertion failed: !global.is_null() - backtrace::backtrace::trace<closure> at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42 1: 0x55cc528594df - backtrace::capture::{{impl}}::new at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64 2: 0x55cc4ca9b52e - servo::main::{{closure}} at /shared/dev/rust/servo/ports/servo/main.rs:130 3: 0x55cc53827d96 - std::panicking::rust_panic_with_hook at /checkout/src/libstd/panicking.rs:578 4: 0x55cc4e3eba65 - std::panicking::begin_panic<&str> at /checkout/src/libstd/panicking.rs:538 5: 0x55cc4e06d394 - script::dom::globalscope::global_scope_from_global at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611 6: 0x55cc4e06ae8e - script::dom::globalscope::{{impl}}::from_object at /shared/dev/rust/servo/components/script/dom/globalscope.rs:160 7: 0x55cc4e069d70 - script::dom::globalscope::{{impl}}::from_reflector<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/globalscope.rs:152 8: 0x55cc4dff06b3 - script::dom::bindings::reflector::DomObject::global<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/bindings/reflector.rs:81 9: 0x55cc4e0bb0f3 - script::dom::promise::{{impl}}::drop at /shared/dev/rust/servo/components/script/dom/promise.rs:64 10: 0x55cc4fa309b4 - core::ptr::drop_in_place<script::dom::promise::Promise> at /checkout/src/libcore/ptr.rs:61 11: 0x55cc4fa35f28 - core::ptr::drop_in_place<alloc::rc::RcBox<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 12: 0x55cc4fac9688 - alloc::rc::{{impl}}::drop<script::dom::promise::Promise> at /checkout/src/liballoc/rc.rs:791 13: 0x55cc4dacbac4 - core::ptr::drop_in_place<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 14: 0x55cc4dac6b05 - core::ptr::drop_in_place<[alloc::rc::Rc<script::dom::promise::Promise>]> at /checkout/src/libcore/ptr.rs:61 15: 0x55cc4dc73ab1 - alloc::vec::{{impl}}::drop<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/liballoc/vec.rs:2110 16: 0x55cc4e68cdb4 - core::ptr::drop_in_place<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>> at /checkout/src/libcore/ptr.rs:61 17: 0x55cc4e687264 - core::ptr::drop_in_place<core::cell::UnsafeCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 18: 0x55cc4e697698 - core::ptr::drop_in_place<core::cell::RefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 19: 0x55cc4e683124 - core::ptr::drop_in_place<script::dom::bindings::cell::DOMRefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 20: 0x55cc4e691f4f - core::ptr::drop_in_place<script::dom::htmlmediaelement::HTMLMediaElement> at /checkout/src/libcore/ptr.rs:61 21: 0x55cc4e6814d4 - core::ptr::drop_in_place<script::dom::htmlaudioelement::HTMLAudioElement> at /checkout/src/libcore/ptr.rs:61 22: 0x55cc4e6793d7 - core::ptr::drop_in_place<alloc::boxed::Box<script::dom::htmlaudioelement::HTMLAudioElement>> at /checkout/src/libcore/ptr.rs:61 23: 0x55cc4e8ce473 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize::{{closure}} at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:486 24: 0x55cc4e66dd4c - core::ops::function::FnOnce::call_once<closure,()> at /checkout/src/libcore/ops/function.rs:223 25: 0x55cc4e2ff24c - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 26: 0x55cc4e5aa139 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 27: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 28: 0x55cc4e47f84a - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 29: 0x55cc4e3c7523 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 30: 0x55cc4f741d79 - js::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,()> at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/panic.rs:22 31: 0x55cc4e1f3178 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:481 32: 0x55cc52f78b65 - _ZNK2js5Class10doFinalizeEPNS_6FreeOpEP8JSObject at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Class.h:815 33: 0x55cc52f81342 - _ZN8JSObject8finalizeEPN2js6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsobjinlines.h:85 34: 0x55cc52f9b5dd - _ZN2js2gc5Arena8finalizeI8JSObjectEEmPNS_6FreeOpENS0_9AllocKindEm 35: 0x55cc52f6f861 - FinalizeTypedArenas<JSObject> at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:505 36: 0x55cc52f3d12c - FinalizeArenas at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:539 37: 0x55cc52f83b88 - _ZN2js2gc10ArenaLists16forceFinalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 38: 0x55cc52f83a31 - _ZN2js2gc10ArenaLists11finalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 39: 0x55cc52f44ac0 - _ZN2js2gc10ArenaLists30queueForegroundObjectsForSweepEPNS_6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:2839 40: 0x55cc52f4cae5 - _ZN2js2gc9GCRuntime22beginSweepingZoneGroupERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5127 41: 0x55cc52f4d23f - _ZN2js2gc9GCRuntime15beginSweepPhaseEbRNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5215 42: 0x55cc52f4faaa - _ZN2js2gc9GCRuntime23incrementalCollectSliceERNS_11SliceBudgetEN2JS8gcreason6ReasonERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5937 43: 0x55cc52f5060a - _ZN2js2gc9GCRuntime7gcCycleEbRNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6174 44: 0x55cc52f50b4b - _ZN2js2gc9GCRuntime7collectEbNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6287 45: 0x55cc52f50eda - _ZN2js2gc9GCRuntime2gcE18JSGCInvocationKindN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6354 46: 0x55cc531a64dd - _ZN9JSRuntime14destroyRuntimeEv at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/vm/Runtime.cpp:430 47: 0x55cc52ef0693 - _ZN9JSContextD2Ev at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:892 48: 0x55cc52f047c0 - js_delete_poison<JSContext> at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Utility.h:392 49: 0x55cc52eedfd3 - _ZN2js14DestroyContextEP9JSContext at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:133 50: 0x55cc52e885e3 - _Z17JS_DestroyRuntimeP9JSRuntime at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsapi.cpp:464 51: 0x55cc4fdc2d5c - js::rust::{{impl}}::drop at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/rust.rs:240 52: 0x55cc4fa29614 - core::ptr::drop_in_place<js::rust::Runtime> at /checkout/src/libcore/ptr.rs:61 53: 0x55cc4fa17b28 - core::ptr::drop_in_place<alloc::rc::RcBox<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 54: 0x55cc4fac95a8 - alloc::rc::{{impl}}::drop<js::rust::Runtime> at /checkout/src/liballoc/rc.rs:791 55: 0x55cc4f26f0f4 - core::ptr::drop_in_place<alloc::rc::Rc<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 56: 0x55cc4f2466f2 - core::ptr::drop_in_place<script::script_thread::ScriptThread> at /checkout/src/libcore/ptr.rs:61 57: 0x55cc4f4bbc60 - script::script_thread::{{impl}}::create::{{closure}} at /shared/dev/rust/servo/components/script/script_thread.rs:578 58: 0x55cc4ee0e4ba - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at /checkout/src/libstd/sys_common/backtrace.rs:136 59: 0x55cc4e3eb933 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:394 60: 0x55cc4e30ae7a - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 61: 0x55cc4e5674f2 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 62: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 63: 0x55cc4e402a6c - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 64: 0x55cc4e3a6ab5 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 65: 0x55cc4d9ab20b - std::thread::{{impl}}::spawn::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:393 66: 0x55cc4db68d13 - alloc::boxed::{{impl}}::call_box<(),closure> at /checkout/src/liballoc/boxed.rs:728 67: 0x55cc53826a1b - alloc::boxed::{{impl}}::call_once<(),()> at /checkout/src/liballoc/boxed.rs:738 - std::sys_common::thread::start_thread at /checkout/src/libstd/sys_common/thread.rs:24 - std::sys::imp::thread::{{impl}}::new::thread_start at /checkout/src/libstd/sys/unix/thread.rs:90 68: 0x7fbe4ff52493 - start_thread 69: 0x7fbe4fa7fabe - __clone 70: 0x0 - <unknown> stack backtrace: ERROR:servo: assertion failed: !global.is_null() 0: 0x55cc52866374 - backtrace::backtrace::libunwind::trace at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/libunwind.rs:53 - backtrace::backtrace::trace<closure> at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42 1: 0x55cc528594df - backtrace::capture::{{impl}}::new at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64 2: 0x55cc4ca9b52e - servo::main::{{closure}} at /shared/dev/rust/servo/ports/servo/main.rs:130 3: 0x55cc53827d96 - std::panicking::rust_panic_with_hook at /checkout/src/libstd/panicking.rs:578 4: 0x55cc4e3eba65 - std::panicking::begin_panic<&str> at /checkout/src/libstd/panicking.rs:538 5: 0x55cc4e06d394 - script::dom::globalscope::global_scope_from_global at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611 6: 0x55cc4e06ae8e - script::dom::globalscope::{{impl}}::from_object at /shared/dev/rust/servo/components/script/dom/globalscope.rs:160 7: 0x55cc4e069d70 - script::dom::globalscope::{{impl}}::from_reflector<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/globalscope.rs:152 8: 0x55cc4dff06b3 - script::dom::bindings::reflector::DomObject::global<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/bindings/reflector.rs:81 9: 0x55cc4e0bb0f3 - script::dom::promise::{{impl}}::drop at /shared/dev/rust/servo/components/script/dom/promise.rs:64 10: 0x55cc4fa309b4 - core::ptr::drop_in_place<script::dom::promise::Promise> at /checkout/src/libcore/ptr.rs:61 11: 0x55cc4fa35f28 - core::ptr::drop_in_place<alloc::rc::RcBox<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 12: 0x55cc4fac9688 - alloc::rc::{{impl}}::drop<script::dom::promise::Promise> at /checkout/src/liballoc/rc.rs:791 13: 0x55cc4dacbac4 - core::ptr::drop_in_place<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 14: 0x55cc4dac6b05 - core::ptr::drop_in_place<[alloc::rc::Rc<script::dom::promise::Promise>]> at /checkout/src/libcore/ptr.rs:61 15: 0x55cc4dc73ab1 - alloc::vec::{{impl}}::drop<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/liballoc/vec.rs:2110 16: 0x55cc4e68cdb4 - core::ptr::drop_in_place<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>> at /checkout/src/libcore/ptr.rs:61 17: 0x55cc4e687264 - core::ptr::drop_in_place<core::cell::UnsafeCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 18: 0x55cc4e697698 - core::ptr::drop_in_place<core::cell::RefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 19: 0x55cc4e683124 - core::ptr::drop_in_place<script::dom::bindings::cell::DOMRefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 20: 0x55cc4e691f4f - core::ptr::drop_in_place<script::dom::htmlmediaelement::HTMLMediaElement> at /checkout/src/libcore/ptr.rs:61 21: 0x55cc4e6814d4 - core::ptr::drop_in_place<script::dom::htmlaudioelement::HTMLAudioElement> at /checkout/src/libcore/ptr.rs:61 22: 0x55cc4e6793d7 - core::ptr::drop_in_place<alloc::boxed::Box<script::dom::htmlaudioelement::HTMLAudioElement>> at /checkout/src/libcore/ptr.rs:61 23: 0x55cc4e8ce473 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize::{{closure}} at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:486 24: 0x55cc4e66dd4c - core::ops::function::FnOnce::call_once<closure,()> at /checkout/src/libcore/ops/function.rs:223 25: 0x55cc4e2ff24c - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 26: 0x55cc4e5aa139 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 27: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 28: 0x55cc4e47f84a - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 29: 0x55cc4e3c7523 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 30: 0x55cc4f741d79 - js::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,()> at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/panic.rs:22 31: 0x55cc4e1f3178 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:481 32: 0x55cc52f78b65 - _ZNK2js5Class10doFinalizeEPNS_6FreeOpEP8JSObject at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Class.h:815 33: 0x55cc52f81342 - _ZN8JSObject8finalizeEPN2js6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsobjinlines.h:85 34: 0x55cc52f9b5dd - _ZN2js2gc5Arena8finalizeI8JSObjectEEmPNS_6FreeOpENS0_9AllocKindEm 35: 0x55cc52f6f861 - FinalizeTypedArenas<JSObject> at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:505 36: 0x55cc52f3d12c - FinalizeArenas at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:539 37: 0x55cc52f83b88 - _ZN2js2gc10ArenaLists16forceFinalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 38: 0x55cc52f83a31 - _ZN2js2gc10ArenaLists11finalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 39: 0x55cc52f44ac0 - _ZN2js2gc10ArenaLists30queueForegroundObjectsForSweepEPNS_6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:2839 40: 0x55cc52f4cae5 - _ZN2js2gc9GCRuntime22beginSweepingZoneGroupERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5127 41: 0x55cc52f4d23f - _ZN2js2gc9GCRuntime15beginSweepPhaseEbRNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5215 42: 0x55cc52f4faaa - _ZN2js2gc9GCRuntime23incrementalCollectSliceERNS_11SliceBudgetEN2JS8gcreason6ReasonERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5937 43: 0x55cc52f5060a - _ZN2js2gc9GCRuntime7gcCycleEbRNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6174 44: 0x55cc52f50b4b - _ZN2js2gc9GCRuntime7collectEbNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6287 45: 0x55cc52f50eda - _ZN2js2gc9GCRuntime2gcE18JSGCInvocationKindN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6354 46: 0x55cc531a64dd - _ZN9JSRuntime14destroyRuntimeEv at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/vm/Runtime.cpp:430 47: 0x55cc52ef0693 - _ZN9JSContextD2Ev at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:892 48: 0x55cc52f047c0 - js_delete_poison<JSContext> at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Utility.h:392 49: 0x55cc52eedfd3 - _ZN2js14DestroyContextEP9JSContext at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:133 50: 0x55cc52e885e3 - _Z17JS_DestroyRuntimeP9JSRuntime at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsapi.cpp:464 51: 0x55cc4fdc2d5c - js::rust::{{impl}}::drop at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/rust.rs:240 52: 0x55cc4fa29614 - core::ptr::drop_in_place<js::rust::Runtime> at /checkout/src/libcore/ptr.rs:61 53: 0x55cc4fa17b28 - core::ptr::drop_in_place<alloc::rc::RcBox<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 54: 0x55cc4fac95a8 - alloc::rc::{{impl}}::drop<js::rust::Runtime> at /checkout/src/liballoc/rc.rs:791 55: 0x55cc4f26f0f4 - core::ptr::drop_in_place<alloc::rc::Rc<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 56: 0x55cc4f2466f2 - core::ptr::drop_in_place<script::script_thread::ScriptThread> at /checkout/src/libcore/ptr.rs:61 57: 0x55cc4f4bbc60 - script::script_thread::{{impl}}::create::{{closure}} at /shared/dev/rust/servo/components/script/script_thread.rs:578 58: 0x55cc4ee0e4ba - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at /checkout/src/libstd/sys_common/backtrace.rs:136 59: 0x55cc4e3eb933 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:394 60: 0x55cc4e30ae7a - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 61: 0x55cc4e5674f2 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 62: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 63: 0x55cc4e402a6c - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 64: 0x55cc4e3a6ab5 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 65: 0x55cc4d9ab20b - std::thread::{{impl}}::spawn::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:393 66: 0x55cc4db68d13 - alloc::boxed::{{impl}}::call_box<(),closure> at /checkout/src/liballoc/boxed.rs:728 67: 0x55cc53826a1b - alloc::boxed::{{impl}}::call_once<(),()> at /checkout/src/liballoc/boxed.rs:738 - std::sys_common::thread::start_thread at /checkout/src/libstd/sys_common/thread.rs:24 - std::sys::imp::thread::{{impl}}::new::thread_start at /checkout/src/libstd/sys/unix/thread.rs:90 68: 0x7fbe4ff52493 - start_thread 69: 0x7fbe4fa7fabe - __clone 70: 0x0 - <unknown> stack backtrace: 0: 0x55cc52866374 - backtrace::backtrace::libunwind::trace ERROR:servo: assertion failed: !global.is_null() at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/libunwind.rs:53 - backtrace::backtrace::trace<closure> at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42 1: 0x55cc528594df - backtrace::capture::{{impl}}::new at /shared/dev/rust/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64 2: 0x55cc4ca9b52e - servo::main::{{closure}} at /shared/dev/rust/servo/ports/servo/main.rs:130 3: 0x55cc53827d96 - std::panicking::rust_panic_with_hook at /checkout/src/libstd/panicking.rs:578 4: 0x55cc4e3eba65 - std::panicking::begin_panic<&str> at /checkout/src/libstd/panicking.rs:538 5: 0x55cc4e06d394 - script::dom::globalscope::global_scope_from_global at /shared/dev/rust/servo/components/script/dom/globalscope.rs:611 6: 0x55cc4e06ae8e - script::dom::globalscope::{{impl}}::from_object at /shared/dev/rust/servo/components/script/dom/globalscope.rs:160 7: 0x55cc4e069d70 - script::dom::globalscope::{{impl}}::from_reflector<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/globalscope.rs:152 8: 0x55cc4dff06b3 - script::dom::bindings::reflector::DomObject::global<script::dom::promise::Promise> at /shared/dev/rust/servo/components/script/dom/bindings/reflector.rs:81 9: 0x55cc4e0bb0f3 - script::dom::promise::{{impl}}::drop at /shared/dev/rust/servo/components/script/dom/promise.rs:64 10: 0x55cc4fa309b4 - core::ptr::drop_in_place<script::dom::promise::Promise> at /checkout/src/libcore/ptr.rs:61 11: 0x55cc4fa35f28 - core::ptr::drop_in_place<alloc::rc::RcBox<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 12: 0x55cc4fac9688 - alloc::rc::{{impl}}::drop<script::dom::promise::Promise> at /checkout/src/liballoc/rc.rs:791 13: 0x55cc4dacbac4 - core::ptr::drop_in_place<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/libcore/ptr.rs:61 14: 0x55cc4dac6b05 - core::ptr::drop_in_place<[alloc::rc::Rc<script::dom::promise::Promise>]> at /checkout/src/libcore/ptr.rs:61 15: 0x55cc4dc73ab1 - alloc::vec::{{impl}}::drop<alloc::rc::Rc<script::dom::promise::Promise>> at /checkout/src/liballoc/vec.rs:2110 16: 0x55cc4e68cdb4 - core::ptr::drop_in_place<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>> at /checkout/src/libcore/ptr.rs:61 17: 0x55cc4e687264 - core::ptr::drop_in_place<core::cell::UnsafeCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 18: 0x55cc4e697698 - core::ptr::drop_in_place<core::cell::RefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 19: 0x55cc4e683124 - core::ptr::drop_in_place<script::dom::bindings::cell::DOMRefCell<alloc::vec::Vec<alloc::rc::Rc<script::dom::promise::Promise>>>> at /checkout/src/libcore/ptr.rs:61 20: 0x55cc4e691f4f - core::ptr::drop_in_place<script::dom::htmlmediaelement::HTMLMediaElement> at /checkout/src/libcore/ptr.rs:61 21: 0x55cc4e6814d4 - core::ptr::drop_in_place<script::dom::htmlaudioelement::HTMLAudioElement> at /checkout/src/libcore/ptr.rs:61 22: 0x55cc4e6793d7 - core::ptr::drop_in_place<alloc::boxed::Box<script::dom::htmlaudioelement::HTMLAudioElement>> at /checkout/src/libcore/ptr.rs:61 23: 0x55cc4e8ce473 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize::{{closure}} at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:486 24: 0x55cc4e66dd4c - core::ops::function::FnOnce::call_once<closure,()> at /checkout/src/libcore/ops/function.rs:223 25: 0x55cc4e2ff24c - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 26: 0x55cc4e5aa139 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 27: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 28: 0x55cc4e47f84a - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 29: 0x55cc4e3c7523 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 30: 0x55cc4f741d79 - js::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,()> at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/panic.rs:22 31: 0x55cc4e1f3178 - script::dom::bindings::codegen::Bindings::HTMLAudioElementBinding::HTMLAudioElementBinding::_finalize at /shared/dev/rust/servo/target/debug/build/script-bde6f1c9971e240a/out/Bindings/HTMLAudioElementBinding.rs:481 32: 0x55cc52f78b65 - _ZNK2js5Class10doFinalizeEPNS_6FreeOpEP8JSObject at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Class.h:815 33: 0x55cc52f81342 - _ZN8JSObject8finalizeEPN2js6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsobjinlines.h:85 34: 0x55cc52f9b5dd - _ZN2js2gc5Arena8finalizeI8JSObjectEEmPNS_6FreeOpENS0_9AllocKindEm 35: 0x55cc52f6f861 - FinalizeTypedArenas<JSObject> at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:505 36: 0x55cc52f3d12c - FinalizeArenas at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:539 37: 0x55cc52f83b88 - _ZN2js2gc10ArenaLists16forceFinalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 38: 0x55cc52f83a31 - _ZN2js2gc10ArenaLists11finalizeNowEPNS_6FreeOpENS0_9AllocKindENS1_14KeepArenasEnumEPPNS0_5ArenaE 39: 0x55cc52f44ac0 - _ZN2js2gc10ArenaLists30queueForegroundObjectsForSweepEPNS_6FreeOpE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:2839 40: 0x55cc52f4cae5 - _ZN2js2gc9GCRuntime22beginSweepingZoneGroupERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5127 41: 0x55cc52f4d23f - _ZN2js2gc9GCRuntime15beginSweepPhaseEbRNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5215 42: 0x55cc52f4faaa - _ZN2js2gc9GCRuntime23incrementalCollectSliceERNS_11SliceBudgetEN2JS8gcreason6ReasonERNS_26AutoLockForExclusiveAccessE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:5937 43: 0x55cc52f5060a - _ZN2js2gc9GCRuntime7gcCycleEbRNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6174 44: 0x55cc52f50b4b - _ZN2js2gc9GCRuntime7collectEbNS_11SliceBudgetEN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6287 45: 0x55cc52f50eda - _ZN2js2gc9GCRuntime2gcE18JSGCInvocationKindN2JS8gcreason6ReasonE at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsgc.cpp:6354 46: 0x55cc531a64dd - _ZN9JSRuntime14destroyRuntimeEv at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/vm/Runtime.cpp:430 47: 0x55cc52ef0693 - _ZN9JSContextD2Ev at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:892 48: 0x55cc52f047c0 - js_delete_poison<JSContext> at /shared/dev/rust/servo/target/debug/build/mozjs_sys-3f17251bb3fa499d/out/dist/include/js/Utility.h:392 49: 0x55cc52eedfd3 - _ZN2js14DestroyContextEP9JSContext at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jscntxt.cpp:133 50: 0x55cc52e885e3 - _Z17JS_DestroyRuntimeP9JSRuntime at /shared/dev/rust/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/834ce35/mozjs/js/src/jsapi.cpp:464 51: 0x55cc4fdc2d5c - js::rust::{{impl}}::drop at /shared/dev/rust/servo/.cargo/git/checkouts/rust-mozjs-8611526964119dd6/3de4ff3/src/rust.rs:240 52: 0x55cc4fa29614 - core::ptr::drop_in_place<js::rust::Runtime> at /checkout/src/libcore/ptr.rs:61 53: 0x55cc4fa17b28 - core::ptr::drop_in_place<alloc::rc::RcBox<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 54: 0x55cc4fac95a8 - alloc::rc::{{impl}}::drop<js::rust::Runtime> at /checkout/src/liballoc/rc.rs:791 55: 0x55cc4f26f0f4 - core::ptr::drop_in_place<alloc::rc::Rc<js::rust::Runtime>> at /checkout/src/libcore/ptr.rs:61 56: 0x55cc4f2466f2 - core::ptr::drop_in_place<script::script_thread::ScriptThread> at /checkout/src/libcore/ptr.rs:61 57: 0x55cc4f4bbc60 - script::script_thread::{{impl}}::create::{{closure}} at /shared/dev/rust/servo/components/script/script_thread.rs:578 58: 0x55cc4ee0e4ba - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at /checkout/src/libstd/sys_common/backtrace.rs:136 59: 0x55cc4e3eb933 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:394 60: 0x55cc4e30ae7a - std::panic::{{impl}}::call_once<(),closure> at /checkout/src/libstd/panic.rs:296 61: 0x55cc4e5674f2 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panicking.rs:480 62: 0x55cc5382ef2c - panic_unwind::__rust_maybe_catch_panic at /checkout/src/libpanic_unwind/lib.rs:99 63: 0x55cc4e402a6c - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>> at /checkout/src/libstd/panicking.rs:459 64: 0x55cc4e3a6ab5 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at /checkout/src/libstd/panic.rs:361 65: 0x55cc4d9ab20b - std::thread::{{impl}}::spawn::{{closure}}<closure,()> at /checkout/src/libstd/thread/mod.rs:393 66: 0x55cc4db68d13 - alloc::boxed::{{impl}}::call_box<(),closure> at /checkout/src/liballoc/boxed.rs:728 67: 0x55cc53826a1b - alloc::boxed::{{impl}}::call_once<(),()> at /checkout/src/liballoc/boxed.rs:738 - std::sys_common::thread::start_thread at /checkout/src/libstd/sys_common/thread.rs:24 - std::sys::imp::thread::{{impl}}::new::thread_start at /checkout/src/libstd/sys/unix/thread.rs:90 68: 0x7fbe4ff52493 - start_thread 69: 0x7fbe4fa7fabe - __clone 70: 0x0 - <unknown> ERROR:servo: assertion failed: !global.is_null() Pipeline failed in hard-fail mode. Crashing! Servo exited with return value 1