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assertion failed (!global.is_null()) during Promise destructor after navigation #18651

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assertion failed (!global.is_null()) during Promise destructor after navigation#18651
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A-content/bindingsThe DOM bindingsC-has-manual-testcaseE-candidate-for-mentoringI-panicServo encounters a panic.
@mateon1

Description

@mateon1
mateon1
opened on Sep 27, 2017

Found with domato.

<style>
audio{border:dashed; border-image-source: url(data:image/gif;base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7)}
</style>
<script>
function jsfuzzer(){
form = document.querySelector("form");
media = document.querySelector("audio");
form.submit();
media.play();
}
</script>
<body onload="jsfuzzer()"><form><audio>x

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

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A-content/bindingsThe DOM bindingsC-has-manual-testcaseE-candidate-for-mentoringI-panicServo encounters a panic.

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