Panic (unreachable layout channel) when refreshing arstechnica.com #19168

jdm · 2017-11-09T21:09:05Z

(lldb) bt
error: need to add support for DW_TAG_base_type '()' encoded with DW_ATE = 0x7, bit_size = 0
* thread #70, stop reason = breakpoint 1.1
  * frame #0: 0x00000001020cb044 servo`std::panicking::rust_panic at panicking.rs:608 [opt]
    frame #1: 0x00000001020cb020 servo`std::panicking::rust_panic_with_hook at panicking.rs:593 [opt]
    frame #2: 0x00000001020cade5 servo`std::panicking::begin_panic<alloc::string::String> at panicking.rs:538 [opt]
    frame #3: 0x00000001020cad33 servo`std::panicking::begin_panic_fmt at panicking.rs:522 [opt]
    frame #4: 0x00000001020cac9b servo`std::panicking::rust_begin_panic at panicking.rs:498 [opt]
    frame #5: 0x00000001020dfde4 servo`core::panicking::panic_fmt at panicking.rs:71 [opt]
    frame #6: 0x00000001008eecc6 servo`core::result::unwrap_failed<std::sync::mpsc::SendError<script_layout_interface::message::Msg>>(msg=<error: memory read failed for 0x0>, error=<unavailable>) at macros.rs:23 [opt]
    frame #7: 0x0000000100ccc26e servo`script::dom::window::{{impl}}::force_reflow [inlined] core::result::{{impl}}::unwrap<(),std::sync::mpsc::SendError<script_layout_interface::message::Msg>> at result.rs:772 [opt]
    frame #8: 0x0000000100ccc259 servo`script::dom::window::{{impl}}::force_reflow(self=<unavailable>, reflow_goal=<unavailable>, reason=<unavailable>) at window.rs:1248 [opt]
    frame #9: 0x0000000100cce1df servo`script::dom::window::{{impl}}::reflow(self=&0x115694b00, reflow_goal=<unavailable>, reason=Query) at window.rs:1324 [opt]
    frame #10: 0x0000000100af64ce servo`script::dom::cssstyledeclaration::{{impl}}::get_property_value at window.rs:1453 [opt]
    frame #11: 0x0000000100af6491 servo`script::dom::cssstyledeclaration::{{impl}}::get_property_value at cssstyledeclaration.rs:215 [opt]
    frame #12: 0x0000000100af6491 servo`script::dom::cssstyledeclaration::{{impl}}::get_property_value(self=&0x13a676780, id=<unavailable>) at cssstyledeclaration.rs:223 [opt]
    frame #13: 0x00000001006b8c1b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> at cssstyledeclaration.rs:167 [opt]
    frame #14: 0x00000001006b8c05 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> at CSSStyleDeclarationBinding.rs:10806 [opt]
    frame #15: 0x00000001006b8c00 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] core::ops::function::FnOnce::call_once<closure,()> at function.rs:223 [opt]
    frame #16: 0x00000001006b8c00 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] std::panic::{{impl}}::call_once<bool,closure> at panic.rs:296 [opt]
    frame #17: 0x00000001006b8c00 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool>(data=&0x7000156097b0) at panicking.rs:480 [opt]
    frame #18: 0x00000001020d7d6d servo`panic_unwind::__rust_maybe_catch_panic at lib.rs:99 [opt]
    frame #19: 0x0000000100d9ebaf servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity at panicking.rs:459 [opt]
    frame #20: 0x0000000100d9eb6c servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity [inlined] std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,bool> at panic.rs:361 [opt]
    frame #21: 0x0000000100d9eb6c servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity at panic.rs:22 [opt]
    frame #22: 0x0000000100d9eb6c servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity(cx=<unavailable>, _obj=<unavailable>, this=<unavailable>, args=<unavailable>) at CSSStyleDeclarationBinding.rs:10802 [opt]
    frame #23: 0x0000000100aabf04 servo`script::dom::bindings::utils::generic_call(cx=<unavailable>, argc=0, vp=&0x700015609978, is_lenient=<unavailable>, call=&0x1018004f0) at utils.rs:450 [opt]
    frame #24: 0x0000000101c7d60e servo`js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct) [inlined] js::CallJSNative(native=0x0000000100aac090)(JSContext*, unsigned int, JS::Value*), JS::CallArgs const&) at jscntxtinlines.h:232 [opt]
    frame #25: 0x0000000101c7d5f0 servo`js::InternalCallOrConstruct(cx=&0x107a08600, args=0x0000700015609948, construct=<unavailable>) at Interpreter.cpp:453 [opt]
    frame #26: 0x0000000101ca116a servo`CallGetter(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<js::Shape*>, JS::MutableHandle<JS::Value>) [inlined] js::Call(cx=&0x107a08600, args=0x0000700015609988) at Interpreter.cpp:517 [opt]
    frame #27: 0x0000000101ca114a servo`CallGetter(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<js::Shape*>, JS::MutableHandle<JS::Value>) [inlined] js::CallGetter(thisv=<unavailable>, getter=<unavailable>, rval=<unavailable>) at Interpreter.cpp:631 [opt]
    frame #28: 0x0000000101ca10e8 servo`CallGetter(cx=&0x107a08600, obj=None, receiver=None, shape=<unavailable>, vp=None) at NativeObject.cpp:1737 [opt]
    frame #29: 0x0000000101c94891 servo`js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) [inlined] bool GetExistingProperty<(js::AllowGC)1>(receiver=None)1>::HandleType, js::MaybeRooted<js::NativeObject*, (js::AllowGC)1>::HandleType, js::MaybeRooted<js::Shape*, (js::AllowGC)1>::HandleType, js::MaybeRooted<JS::Value, (js::AllowGC)1>::MutableHandleType) at NativeObject.cpp:1785 [opt]
    frame #30: 0x0000000101c94804 servo`js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) at NativeObject.cpp:2012 [opt]
    frame #31: 0x0000000101c942e4 servo`js::NativeGetProperty(cx=&0x107a08600, obj=None, receiver=None, id=None, vp=None) at NativeObject.cpp:2046 [opt]
    frame #32: 0x0000000101b5a938 servo`JS_ForwardGetPropertyTo(JSContext*, JS::Handle<JSObject*>, JS::Handle<jsid>, JS::Handle<JS::Value>, JS::MutableHandle<JS::Value>) [inlined] js::GetProperty(cx=<unavailable>, receiver=<unavailable>, id=<unavailable>, vp=<unavailable>) at NativeObject.h:1481 [opt]
    frame #33: 0x0000000101b5a8f5 servo`JS_ForwardGetPropertyTo(cx=&0x107a08600, obj=<unavailable>, id=<unavailable>, receiver=<unavailable>, vp=None) at jsapi.cpp:2527 [opt]
    frame #34: 0x0000000100aab230 servo`script::dom::bindings::utils::get_property_on_prototype(cx=&0x107a08600, proxy=<unavailable>, receiver=<unavailable>, id=<unavailable>, found=<unavailable>, vp=<unavailable>) at utils.rs:152 [opt]
    frame #35: 0x00000001006341fc servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> at CSSStyleDeclarationBinding.rs:30565 [opt]
    frame #36: 0x000000010063405b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] core::ops::function::FnOnce::call_once<closure,()> at function.rs:223 [opt]
    frame #37: 0x000000010063405b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] std::panic::{{impl}}::call_once<bool,closure> at panic.rs:296 [opt]
    frame #38: 0x000000010063405b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool>(data=&0x700015609c70) at panicking.rs:480 [opt]
    frame #39: 0x00000001020d7d6d servo`panic_unwind::__rust_maybe_catch_panic at lib.rs:99 [opt]
    frame #40: 0x0000000100de5482 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get at panicking.rs:459 [opt]
    frame #41: 0x0000000100de5423 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get [inlined] std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,bool> at panic.rs:361 [opt]
    frame #42: 0x0000000100de5423 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get at panic.rs:22 [opt]
    frame #43: 0x0000000100de5423 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get(cx=<unavailable>, proxy=<unavailable>, receiver=<unavailable>, id=<unavailable>, vp=<unavailable>) at CSSStyleDeclarationBinding.rs:30533 [opt]
    frame #44: 0x0000000101c180c4 servo`js::Proxy::get(cx=&0x107a08600, proxy=<unavailable>, receiver_=<unavailable>, id=None, vp=<unavailable>) at Proxy.cpp:310 [opt]
    frame #45: 0x0000000101c20fb3 servo`js::Wrapper::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) const at NativeObject.h:1480 [opt]
    frame #46: 0x0000000101c20f8a servo`js::Wrapper::get(this=<unavailable>, cx=<unavailable>, proxy=<unavailable>, receiver=<unavailable>, id=<unavailable>, vp=<unavailable>) const at Wrapper.cpp:143 [opt]
    frame #47: 0x0000000101c12a7c servo`js::CrossCompartmentWrapper::get(this=&0x102b3a040, cx=&0x107a08600, wrapper=<unavailable>, receiver=<unavailable>, id=None, vp=None) const at CrossCompartmentWrapper.cpp:205 [opt]
    frame #48: 0x0000000101c180c4 servo`js::Proxy::get(cx=&0x107a08600, proxy=<unavailable>, receiver_=<unavailable>, id=None, vp=<unavailable>) at Proxy.cpp:310 [opt]
    frame #49: 0x0000000101c73e62 servo`Interpret(JSContext*, js::RunState&) [inlined] js::GetProperty(cx=&0x107a08600, obj=<unavailable>, id=<unavailable>, vp=<unavailable>) at jsobj.h:839 [opt]
    frame #50: 0x0000000101c73df4 servo`Interpret(JSContext*, js::RunState&) at Interpreter-inl.h:453 [opt]
    frame #51: 0x0000000101c73cca servo`Interpret(JSContext*, js::RunState&) [inlined] js::GetElementOperation(op=JSOP_NOP) at Interpreter-inl.h:558 [opt]
    frame #52: 0x0000000101c73cca servo`Interpret(cx=&0x107a08600, state=0x000070001560a430) at Interpreter.cpp:2711 [opt]
    frame #53: 0x0000000101c6bb84 servo`js::RunScript(cx=&0x107a08600, state=0x000070001560a430) at Interpreter.cpp:399 [opt]
    frame #54: 0x0000000101c7d697 servo`js::InternalCallOrConstruct(cx=&0x107a08600, args=0x000070001560a768, construct=NO_CONSTRUCT) at Interpreter.cpp:471 [opt]
    frame #55: 0x0000000101c7778a servo`Interpret(JSContext*, js::RunState&) [inlined] js::CallFromStack(cx=&0x107a08600) at Interpreter.cpp:504 [opt]
    frame #56: 0x0000000101c77780 servo`Interpret(cx=&0x107a08600, state=0x000070001560aa30) at Interpreter.cpp:2873 [opt]
    frame #57: 0x0000000101c6bb84 servo`js::RunScript(cx=&0x107a08600, state=0x000070001560aa30) at Interpreter.cpp:399 [opt]
    frame #58: 0x0000000101c7d697 servo`js::InternalCallOrConstruct(cx=&0x107a08600, args=0x000070001560aad8, construct=NO_CONSTRUCT) at Interpreter.cpp:471 [opt]
    frame #59: 0x0000000101c7d856 servo`js::Call(cx=<unavailable>, fval=<unavailable>, thisv=<unavailable>, args=0x000070001560aad8, rval=<unavailable>) at Interpreter.cpp:517 [opt]
    frame #60: 0x0000000101c2129c servo`js::Wrapper::call(this=<unavailable>, cx=&0x107a08600, proxy=<unavailable>, args=0x000070001560ac48) const at Wrapper.cpp:165 [opt]
    frame #61: 0x0000000101c132fc servo`js::CrossCompartmentWrapper::call(this=<unavailable>, cx=&0x107a08600, wrapper=<unavailable>, args=0x000070001560ac48) const at CrossCompartmentWrapper.cpp:329 [opt]
    frame #62: 0x0000000101c18984 servo`js::Proxy::call(cx=&0x107a08600, proxy=<unavailable>, args=0x000070001560ac48) at Proxy.cpp:401 [opt]
    frame #63: 0x0000000101c192f8 servo`js::proxy_Call(cx=<unavailable>, argc=<unavailable>, vp=<unavailable>) at Proxy.cpp:689 [opt]
    frame #64: 0x0000000101c7d766 servo`js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct) [inlined] js::CallJSNative(native=0x0000000101c19280)(JSContext*, unsigned int, JS::Value*), JS::CallArgs const&) at jscntxtinlines.h:232 [opt]
    frame #65: 0x0000000101c7d74c servo`js::InternalCallOrConstruct(cx=&0x107a08600, args=0x000070001560ad28, construct=<unavailable>) at Interpreter.cpp:441 [opt]
    frame #66: 0x0000000101c7d856 servo`js::Call(cx=<unavailable>, fval=<unavailable>, thisv=<unavailable>, args=0x000070001560ad28, rval=<unavailable>) at Interpreter.cpp:517 [opt]
    frame #67: 0x0000000101b5b548 servo`JS_CallFunctionValue(cx=&0x107a08600, obj=<unavailable>, fval=<unavailable>, args=0x000070001560ae00, rval=<unavailable>) at jsapi.cpp:2781 [opt]
    frame #68: 0x0000000101063eb5 servo`script::dom::bindings::codegen::Bindings::WindowBinding::{{impl}}::Call(self=<unavailable>, cx=&0x107a08600, aThisObj=<unavailable>, time=Finite<f64>(1811.4238849999999)) at WindowBinding.rs:492 [opt]
    frame #69: 0x0000000101063b40 servo`script::dom::bindings::codegen::Bindings::WindowBinding::{{impl}}::Call__(self=&0x143ed6910, time=Finite<f64>(1811.4238849999999), aExceptionHandling=<unavailable>) at WindowBinding.rs:471 [opt]
    frame #70: 0x0000000100b10614 servo`script::dom::document::{{impl}}::run_the_animation_frame_callbacks at document.rs:4000 [opt]
    frame #71: 0x0000000100b105ef servo`script::dom::document::{{impl}}::run_the_animation_frame_callbacks(self=&0x115679c00) at document.rs:1526 [opt]
    frame #72: 0x0000000100d1a434 servo`script::script_thread::{{impl}}::handle_msg_from_constellation at script_thread.rs:1918 [opt]
    frame #73: 0x0000000100d1a3bc servo`script::script_thread::{{impl}}::handle_msg_from_constellation(self=&0x70001560d1b8, msg=<unavailable>) at script_thread.rs:1304 [opt]
    frame #74: 0x0000000100d193d4 servo`script::script_thread::{{impl}}::handle_msgs::{{closure}} at script_thread.rs:1071 [opt]
    frame #75: 0x0000000100d14e25 servo`script::script_thread::{{impl}}::handle_msgs at script_thread.rs:1245 [opt]
    frame #76: 0x0000000100d14b9d servo`script::script_thread::{{impl}}::handle_msgs(self=<unavailable>) at script_thread.rs:1065 [opt]
    frame #77: 0x00000001005cb9c8 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at script_thread.rs:897 [opt]
    frame #78: 0x00000001005cb9c0 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> [inlined] script::script_thread::{{impl}}::create::{{closure}}::{{closure}} at script_thread.rs:578 [opt]
    frame #79: 0x00000001005cb9c0 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at mem.rs:63 [opt]
    frame #80: 0x00000001005cb7f2 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at script_thread.rs:577 [opt]
    frame #81: 0x00000001005cb4eb servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()>(f=<unavailable>) at backtrace.rs:134 [opt]
    frame #82: 0x0000000100638cae servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> [inlined] std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at mod.rs:400 [opt]
    frame #83: 0x0000000100638c96 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> [inlined] std::panic::{{impl}}::call_once<(),closure> at panic.rs:296 [opt]
    frame #84: 0x0000000100638c96 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()>(data=<unavailable>) at panicking.rs:480 [opt]
    frame #85: 0x00000001020d7d6d servo`panic_unwind::__rust_maybe_catch_panic at lib.rs:99 [opt]
    frame #86: 0x00000001008f1076 servo`alloc::boxed::{{impl}}::call_box<(),closure> at panicking.rs:459 [opt]
    frame #87: 0x00000001008f103b servo`alloc::boxed::{{impl}}::call_box<(),closure> [inlined] std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at panic.rs:361 [opt]
    frame #88: 0x00000001008f103b servo`alloc::boxed::{{impl}}::call_box<(),closure> [inlined] std::thread::{{impl}}::spawn::{{closure}}<closure,()> at mod.rs:399 [opt]
    frame #89: 0x00000001008f0fee servo`alloc::boxed::{{impl}}::call_box<(),closure>(self=&0x11bdffd00, args=<unavailable>) at boxed.rs:762 [opt]
    frame #90: 0x00000001020c9d9c servo`std::sys::imp::thread::{{impl}}::new::thread_start [inlined] alloc::boxed::{{impl}}::call_once<(),()> at boxed.rs:772 [opt]
    frame #91: 0x00000001020c9d99 servo`std::sys::imp::thread::{{impl}}::new::thread_start [inlined] std::sys_common::thread::start_thread at thread.rs:24 [opt]
    frame #92: 0x00000001020c9d1e servo`std::sys::imp::thread::{{impl}}::new::thread_start at thread.rs:90 [opt]
    frame #93: 0x00007fffd9f7f93b libsystem_pthread.dylib`_pthread_body + 180
    frame #94: 0x00007fffd9f7f887 libsystem_pthread.dylib`_pthread_start + 286
    frame #95: 0x00007fffd9f7f08d libsystem_pthread.dylib`thread_start + 13
(lldb) f 7
frame #7: 0x0000000100ccc26e servo`script::dom::window::{{impl}}::force_reflow [inlined] core::result::{{impl}}::unwrap<(),std::sync::mpsc::SendError<script_layout_interface::message::Msg>> at result.rs:772 [opt]
(lldb) up
frame #8: 0x0000000100ccc259 servo`script::dom::window::{{impl}}::force_reflow(self=<unavailable>, reflow_goal=<unavailable>, reason=<unavailable>) at window.rs:1248 [opt]
   1245	            dom_count: self.Document().dom_count(),
   1246	        };
   1247
-> 1248	        self.layout_chan.send(Msg::Reflow(reflow)).unwrap();
   1249
   1250	        debug!("script: layout forked");
   1251

jdm · 2017-11-09T21:11:01Z

The previous backtrace was from a browser.html run; this is just straight ./mach run http://arstechnica.com --debug:

(lldb) bt
error: need to add support for DW_TAG_base_type '()' encoded with DW_ATE = 0x7, bit_size = 0
* thread #29, stop reason = breakpoint 1.1
  * frame #0: 0x00000001020cb044 servo`std::panicking::rust_panic at panicking.rs:608 [opt]
    frame #1: 0x00000001020cb020 servo`std::panicking::rust_panic_with_hook at panicking.rs:593 [opt]
    frame #2: 0x00000001020cade5 servo`std::panicking::begin_panic<alloc::string::String> at panicking.rs:538 [opt]
    frame #3: 0x00000001020cad33 servo`std::panicking::begin_panic_fmt at panicking.rs:522 [opt]
    frame #4: 0x00000001020cac9b servo`std::panicking::rust_begin_panic at panicking.rs:498 [opt]
    frame #5: 0x00000001020dfde4 servo`core::panicking::panic_fmt at panicking.rs:71 [opt]
    frame #6: 0x00000001008eecc6 servo`core::result::unwrap_failed<std::sync::mpsc::SendError<script_layout_interface::message::Msg>>(msg=<error: memory read failed for 0x0>, error=<unavailable>) at macros.rs:23 [opt]
    frame #7: 0x0000000100ccc26e servo`script::dom::window::{{impl}}::force_reflow [inlined] core::result::{{impl}}::unwrap<(),std::sync::mpsc::SendError<script_layout_interface::message::Msg>> at result.rs:772 [opt]
    frame #8: 0x0000000100ccc259 servo`script::dom::window::{{impl}}::force_reflow(self=<unavailable>, reflow_goal=<unavailable>, reason=<unavailable>) at window.rs:1248 [opt]
    frame #9: 0x0000000100cce1df servo`script::dom::window::{{impl}}::reflow(self=&0x11605b000, reflow_goal=<unavailable>, reason=Query) at window.rs:1324 [opt]
    frame #10: 0x0000000100af64ce servo`script::dom::cssstyledeclaration::{{impl}}::get_property_value at window.rs:1453 [opt]
    frame #11: 0x0000000100af6491 servo`script::dom::cssstyledeclaration::{{impl}}::get_property_value at cssstyledeclaration.rs:215 [opt]
    frame #12: 0x0000000100af6491 servo`script::dom::cssstyledeclaration::{{impl}}::get_property_value(self=&0x111a51f80, id=<unavailable>) at cssstyledeclaration.rs:223 [opt]
    frame #13: 0x00000001006b8c1b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> at cssstyledeclaration.rs:167 [opt]
    frame #14: 0x00000001006b8c05 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> at CSSStyleDeclarationBinding.rs:10806 [opt]
    frame #15: 0x00000001006b8c00 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] core::ops::function::FnOnce::call_once<closure,()> at function.rs:223 [opt]
    frame #16: 0x00000001006b8c00 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] std::panic::{{impl}}::call_once<bool,closure> at panic.rs:296 [opt]
    frame #17: 0x00000001006b8c00 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool>(data=&0x70000eb727b0) at panicking.rs:480 [opt]
    frame #18: 0x00000001020d7d6d servo`panic_unwind::__rust_maybe_catch_panic at lib.rs:99 [opt]
    frame #19: 0x0000000100d9ebaf servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity at panicking.rs:459 [opt]
    frame #20: 0x0000000100d9eb6c servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity [inlined] std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,bool> at panic.rs:361 [opt]
    frame #21: 0x0000000100d9eb6c servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity at panic.rs:22 [opt]
    frame #22: 0x0000000100d9eb6c servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity(cx=<unavailable>, _obj=<unavailable>, this=<unavailable>, args=<unavailable>) at CSSStyleDeclarationBinding.rs:10802 [opt]
    frame #23: 0x0000000100aabf04 servo`script::dom::bindings::utils::generic_call(cx=<unavailable>, argc=0, vp=&0x70000eb72978, is_lenient=<unavailable>, call=&0x1018004f0) at utils.rs:450 [opt]
    frame #24: 0x0000000101c7d60e servo`js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct) [inlined] js::CallJSNative(native=0x0000000100aac090)(JSContext*, unsigned int, JS::Value*), JS::CallArgs const&) at jscntxtinlines.h:232 [opt]
    frame #25: 0x0000000101c7d5f0 servo`js::InternalCallOrConstruct(cx=&0x11680f400, args=0x000070000eb72948, construct=<unavailable>) at Interpreter.cpp:453 [opt]
    frame #26: 0x0000000101ca116a servo`CallGetter(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<js::Shape*>, JS::MutableHandle<JS::Value>) [inlined] js::Call(cx=&0x11680f400, args=0x000070000eb72988) at Interpreter.cpp:517 [opt]
    frame #27: 0x0000000101ca114a servo`CallGetter(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<js::Shape*>, JS::MutableHandle<JS::Value>) [inlined] js::CallGetter(thisv=<unavailable>, getter=<unavailable>, rval=<unavailable>) at Interpreter.cpp:631 [opt]
    frame #28: 0x0000000101ca10e8 servo`CallGetter(cx=&0x11680f400, obj=None, receiver=None, shape=<unavailable>, vp=None) at NativeObject.cpp:1737 [opt]
    frame #29: 0x0000000101c94891 servo`js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) [inlined] bool GetExistingProperty<(js::AllowGC)1>(receiver=None)1>::HandleType, js::MaybeRooted<js::NativeObject*, (js::AllowGC)1>::HandleType, js::MaybeRooted<js::Shape*, (js::AllowGC)1>::HandleType, js::MaybeRooted<JS::Value, (js::AllowGC)1>::MutableHandleType) at NativeObject.cpp:1785 [opt]
    frame #30: 0x0000000101c94804 servo`js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) at NativeObject.cpp:2012 [opt]
    frame #31: 0x0000000101c942e4 servo`js::NativeGetProperty(cx=&0x11680f400, obj=None, receiver=None, id=None, vp=None) at NativeObject.cpp:2046 [opt]
    frame #32: 0x0000000101b5a938 servo`JS_ForwardGetPropertyTo(JSContext*, JS::Handle<JSObject*>, JS::Handle<jsid>, JS::Handle<JS::Value>, JS::MutableHandle<JS::Value>) [inlined] js::GetProperty(cx=<unavailable>, receiver=<unavailable>, id=<unavailable>, vp=<unavailable>) at NativeObject.h:1481 [opt]
    frame #33: 0x0000000101b5a8f5 servo`JS_ForwardGetPropertyTo(cx=&0x11680f400, obj=<unavailable>, id=<unavailable>, receiver=<unavailable>, vp=None) at jsapi.cpp:2527 [opt]
    frame #34: 0x0000000100aab230 servo`script::dom::bindings::utils::get_property_on_prototype(cx=&0x11680f400, proxy=<unavailable>, receiver=<unavailable>, id=<unavailable>, found=<unavailable>, vp=<unavailable>) at utils.rs:152 [opt]
    frame #35: 0x00000001006341fc servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> at CSSStyleDeclarationBinding.rs:30565 [opt]
    frame #36: 0x000000010063405b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] core::ops::function::FnOnce::call_once<closure,()> at function.rs:223 [opt]
    frame #37: 0x000000010063405b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool> [inlined] std::panic::{{impl}}::call_once<bool,closure> at panic.rs:296 [opt]
    frame #38: 0x000000010063405b servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool>(data=&0x70000eb72c70) at panicking.rs:480 [opt]
    frame #39: 0x00000001020d7d6d servo`panic_unwind::__rust_maybe_catch_panic at lib.rs:99 [opt]
    frame #40: 0x0000000100de5482 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get at panicking.rs:459 [opt]
    frame #41: 0x0000000100de5423 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get [inlined] std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,bool> at panic.rs:361 [opt]
    frame #42: 0x0000000100de5423 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get at panic.rs:22 [opt]
    frame #43: 0x0000000100de5423 servo`script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get(cx=<unavailable>, proxy=<unavailable>, receiver=<unavailable>, id=<unavailable>, vp=<unavailable>) at CSSStyleDeclarationBinding.rs:30533 [opt]
    frame #44: 0x0000000101c180c4 servo`js::Proxy::get(cx=&0x11680f400, proxy=<unavailable>, receiver_=<unavailable>, id=None, vp=<unavailable>) at Proxy.cpp:310 [opt]
    frame #45: 0x0000000101c20fb3 servo`js::Wrapper::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) const at NativeObject.h:1480 [opt]
    frame #46: 0x0000000101c20f8a servo`js::Wrapper::get(this=<unavailable>, cx=<unavailable>, proxy=<unavailable>, receiver=<unavailable>, id=<unavailable>, vp=<unavailable>) const at Wrapper.cpp:143 [opt]
    frame #47: 0x0000000101c12a7c servo`js::CrossCompartmentWrapper::get(this=&0x102b3a040, cx=&0x11680f400, wrapper=<unavailable>, receiver=<unavailable>, id=None, vp=None) const at CrossCompartmentWrapper.cpp:205 [opt]
    frame #48: 0x0000000101c180c4 servo`js::Proxy::get(cx=&0x11680f400, proxy=<unavailable>, receiver_=<unavailable>, id=None, vp=<unavailable>) at Proxy.cpp:310 [opt]
    frame #49: 0x0000000101c73e62 servo`Interpret(JSContext*, js::RunState&) [inlined] js::GetProperty(cx=&0x11680f400, obj=<unavailable>, id=<unavailable>, vp=<unavailable>) at jsobj.h:839 [opt]
    frame #50: 0x0000000101c73df4 servo`Interpret(JSContext*, js::RunState&) at Interpreter-inl.h:453 [opt]
    frame #51: 0x0000000101c73cca servo`Interpret(JSContext*, js::RunState&) [inlined] js::GetElementOperation(op=JSOP_NOP) at Interpreter-inl.h:558 [opt]
    frame #52: 0x0000000101c73cca servo`Interpret(cx=&0x11680f400, state=0x000070000eb73430) at Interpreter.cpp:2711 [opt]
    frame #53: 0x0000000101c6bb84 servo`js::RunScript(cx=&0x11680f400, state=0x000070000eb73430) at Interpreter.cpp:399 [opt]
    frame #54: 0x0000000101c7d697 servo`js::InternalCallOrConstruct(cx=&0x11680f400, args=0x000070000eb73768, construct=NO_CONSTRUCT) at Interpreter.cpp:471 [opt]
    frame #55: 0x0000000101c7778a servo`Interpret(JSContext*, js::RunState&) [inlined] js::CallFromStack(cx=&0x11680f400) at Interpreter.cpp:504 [opt]
    frame #56: 0x0000000101c77780 servo`Interpret(cx=&0x11680f400, state=0x000070000eb73a30) at Interpreter.cpp:2873 [opt]
    frame #57: 0x0000000101c6bb84 servo`js::RunScript(cx=&0x11680f400, state=0x000070000eb73a30) at Interpreter.cpp:399 [opt]
    frame #58: 0x0000000101c7d697 servo`js::InternalCallOrConstruct(cx=&0x11680f400, args=0x000070000eb73ad8, construct=NO_CONSTRUCT) at Interpreter.cpp:471 [opt]
    frame #59: 0x0000000101c7d856 servo`js::Call(cx=<unavailable>, fval=<unavailable>, thisv=<unavailable>, args=0x000070000eb73ad8, rval=<unavailable>) at Interpreter.cpp:517 [opt]
    frame #60: 0x0000000101c2129c servo`js::Wrapper::call(this=<unavailable>, cx=&0x11680f400, proxy=<unavailable>, args=0x000070000eb73c48) const at Wrapper.cpp:165 [opt]
    frame #61: 0x0000000101c132fc servo`js::CrossCompartmentWrapper::call(this=<unavailable>, cx=&0x11680f400, wrapper=<unavailable>, args=0x000070000eb73c48) const at CrossCompartmentWrapper.cpp:329 [opt]
    frame #62: 0x0000000101c18984 servo`js::Proxy::call(cx=&0x11680f400, proxy=<unavailable>, args=0x000070000eb73c48) at Proxy.cpp:401 [opt]
    frame #63: 0x0000000101c192f8 servo`js::proxy_Call(cx=<unavailable>, argc=<unavailable>, vp=<unavailable>) at Proxy.cpp:689 [opt]
    frame #64: 0x0000000101c7d766 servo`js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct) [inlined] js::CallJSNative(native=0x0000000101c19280)(JSContext*, unsigned int, JS::Value*), JS::CallArgs const&) at jscntxtinlines.h:232 [opt]
    frame #65: 0x0000000101c7d74c servo`js::InternalCallOrConstruct(cx=&0x11680f400, args=0x000070000eb73d28, construct=<unavailable>) at Interpreter.cpp:441 [opt]
    frame #66: 0x0000000101c7d856 servo`js::Call(cx=<unavailable>, fval=<unavailable>, thisv=<unavailable>, args=0x000070000eb73d28, rval=<unavailable>) at Interpreter.cpp:517 [opt]
    frame #67: 0x0000000101b5b548 servo`JS_CallFunctionValue(cx=&0x11680f400, obj=<unavailable>, fval=<unavailable>, args=0x000070000eb73e00, rval=<unavailable>) at jsapi.cpp:2781 [opt]
    frame #68: 0x0000000101063eb5 servo`script::dom::bindings::codegen::Bindings::WindowBinding::{{impl}}::Call(self=<unavailable>, cx=&0x11680f400, aThisObj=<unavailable>, time=Finite<f64>(3858.708783)) at WindowBinding.rs:492 [opt]
    frame #69: 0x0000000101063b40 servo`script::dom::bindings::codegen::Bindings::WindowBinding::{{impl}}::Call__(self=&0x1161c6fe0, time=Finite<f64>(3858.708783), aExceptionHandling=<unavailable>) at WindowBinding.rs:471 [opt]
    frame #70: 0x0000000100b10614 servo`script::dom::document::{{impl}}::run_the_animation_frame_callbacks at document.rs:4000 [opt]
    frame #71: 0x0000000100b105ef servo`script::dom::document::{{impl}}::run_the_animation_frame_callbacks(self=&0x11b7f1400) at document.rs:1526 [opt]
    frame #72: 0x0000000100d1a434 servo`script::script_thread::{{impl}}::handle_msg_from_constellation at script_thread.rs:1918 [opt]
    frame #73: 0x0000000100d1a3bc servo`script::script_thread::{{impl}}::handle_msg_from_constellation(self=&0x70000eb761b8, msg=<unavailable>) at script_thread.rs:1304 [opt]
    frame #74: 0x0000000100d193d4 servo`script::script_thread::{{impl}}::handle_msgs::{{closure}} at script_thread.rs:1071 [opt]
    frame #75: 0x0000000100d14e25 servo`script::script_thread::{{impl}}::handle_msgs at script_thread.rs:1245 [opt]
    frame #76: 0x0000000100d14b9d servo`script::script_thread::{{impl}}::handle_msgs(self=<unavailable>) at script_thread.rs:1065 [opt]
    frame #77: 0x00000001005cb9c8 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at script_thread.rs:897 [opt]
    frame #78: 0x00000001005cb9c0 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> [inlined] script::script_thread::{{impl}}::create::{{closure}}::{{closure}} at script_thread.rs:578 [opt]
    frame #79: 0x00000001005cb9c0 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at mem.rs:63 [opt]
    frame #80: 0x00000001005cb7f2 servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()> at script_thread.rs:577 [opt]
    frame #81: 0x00000001005cb4eb servo`std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()>(f=<unavailable>) at backtrace.rs:134 [opt]
    frame #82: 0x0000000100638cae servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> [inlined] std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()> at mod.rs:400 [opt]
    frame #83: 0x0000000100638c96 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()> [inlined] std::panic::{{impl}}::call_once<(),closure> at panic.rs:296 [opt]
    frame #84: 0x0000000100638c96 servo`std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()>(data=<unavailable>) at panicking.rs:480 [opt]
    frame #85: 0x00000001020d7d6d servo`panic_unwind::__rust_maybe_catch_panic at lib.rs:99 [opt]
    frame #86: 0x00000001008f1076 servo`alloc::boxed::{{impl}}::call_box<(),closure> at panicking.rs:459 [opt]
    frame #87: 0x00000001008f103b servo`alloc::boxed::{{impl}}::call_box<(),closure> [inlined] std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()> at panic.rs:361 [opt]
    frame #88: 0x00000001008f103b servo`alloc::boxed::{{impl}}::call_box<(),closure> [inlined] std::thread::{{impl}}::spawn::{{closure}}<closure,()> at mod.rs:399 [opt]
    frame #89: 0x00000001008f0fee servo`alloc::boxed::{{impl}}::call_box<(),closure>(self=&0x105565180, args=<unavailable>) at boxed.rs:762 [opt]
    frame #90: 0x00000001020c9d9c servo`std::sys::imp::thread::{{impl}}::new::thread_start [inlined] alloc::boxed::{{impl}}::call_once<(),()> at boxed.rs:772 [opt]
    frame #91: 0x00000001020c9d99 servo`std::sys::imp::thread::{{impl}}::new::thread_start [inlined] std::sys_common::thread::start_thread at thread.rs:24 [opt]
    frame #92: 0x00000001020c9d1e servo`std::sys::imp::thread::{{impl}}::new::thread_start at thread.rs:90 [opt]
    frame #93: 0x00007fffd9f7f93b libsystem_pthread.dylib`_pthread_body + 180
    frame #94: 0x00007fffd9f7f887 libsystem_pthread.dylib`_pthread_start + 286
    frame #95: 0x00007fffd9f7f08d libsystem_pthread.dylib`thread_start + 13

jdm · 2017-11-09T21:13:18Z

In a debug build I got this:

called `Result::unwrap()` on an `Err` value: "SendError(..)" (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZero(NonZero(1))) }, at src/libcore/result.rs:906)
Failed to get frame id from constellation.: Io(Error { repr: Custom(Custom { kind: ConnectionReset, error: StringError("No senders exist for this port.") }) }) (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(5), index: PipelineIndex(NonZero(NonZero(9))) }, at src/libcore/result.rs:906)
Failed to get frame id from constellation.: Io(Error { repr: Custom(Custom { kind: ConnectionReset, error: StringError("No senders exist for this port.") }) }) (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(5), index: PipelineIndex(NonZero(NonZero(14))) }, at src/libcore/result.rs:906)
stack backtrace:
   0:        0x100c9e514 - backtrace::backtrace::trace<closure>
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42
   1:        0x100ca06af - backtrace::capture::Backtrace::new::h4a60748a88db7c5e
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64
   2:        0x10004a18e - servo::main::{{closure}}
                        at ports/servo/main.rs:130
   3:        0x10626d8f1 - std::panicking::rust_panic_with_hook::he6f3840a88b909da
                        at src/libstd/panicking.rs:578
   4:        0x10626d714 - std::panicking::begin_panic<alloc::string::String>
                        at src/libstd/panicking.rs:538
   5:        0x10626d662 - std::panicking::begin_panic_fmt::he894f42f5c15aa71
                        at src/libstd/panicking.rs:522
   6:        0x10626d5ca - rust_begin_unwind
                        at src/libstd/panicking.rs:498
   7:        0x1062827e3 - core::panicking::panic_fmt::h5a21022eae72748c
                        at src/libcore/panicking.rs:71
   8:        0x102ffc8e0 - core::result::unwrap_failed<alloc::boxed::Box<bincode::internal::ErrorKind>>
                        at /Users/travis/build/rust-lang/rust/src/libcore/macros.rs:23
   9:        0x102f4e594 - core::result::{{impl}}::expect<core::option::Option<msg::constellation_msg::BrowsingContextId>,alloc::boxed::Box<bincode::internal::ErrorKind>>
                        at /Users/travis/build/rust-lang/rust/src/libcore/result.rs:799
  10:        0x102aac970 - script::script_thread::{{impl}}::ask_constellation_for_browsing_context_id
                        at components/script/script_thread.rs:2019
  11:        0x102aaccff - script::script_thread::{{impl}}::remote_window_proxy
                        at components/script/script_thread.rs:2041
  12:        0x102aacf1f - script::script_thread::{{impl}}::remote_window_proxy
                        at components/script/script_thread.rs:2046
  13:        0x102aacf1f - script::script_thread::{{impl}}::remote_window_proxy
                        at components/script/script_thread.rs:2046
  14:        0x102aad576 - script::script_thread::{{impl}}::local_window_proxy
                        at components/script/script_thread.rs:2082
  15:        0x102aae8fd - script::script_thread::{{impl}}::load
                        at components/script/script_thread.rs:2166
  16:        0x102aa85bc - script::script_thread::{{impl}}::handle_page_headers_available::{{closure}}
                        at components/script/script_thread.rs:1763
  17:        0x102656db1 - core::option::{{impl}}::map<net_traits::Metadata,script::dom::bindings::root::Root<script::dom::bindings::root::Dom<script::dom::servoparser::ServoParser>>,closure>
                        at /Users/travis/build/rust-lang/rust/src/libcore/option.rs:398
  18:        0x102aa82d8 - script::script_thread::{{impl}}::handle_page_headers_available
                        at components/script/script_thread.rs:1763
  19:        0x102a919ba - script::script_thread::{{impl}}::page_headers_available::{{closure}}
                        at components/script/script_thread.rs:652
  20:        0x1017add55 - std::thread::local::{{impl}}::try_with<core::cell::Cell<core::option::Option<*const script::script_thread::ScriptThread>>,closure,core::option::Option<script::dom::bindings::root::Root<script::dom::bindings::root::Dom<script::dom::servoparser::ServoParser>>>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/local.rs:379
  21:        0x101625822 - std::thread::local::{{impl}}::with<core::cell::Cell<core::option::Option<*const script::script_thread::ScriptThread>>,closure,core::option::Option<script::dom::bindings::root::Root<script::dom::bindings::root::Dom<script::dom::servoparser::ServoParser>>>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/local.rs:293
  22:        0x102a91874 - script::script_thread::ScriptThread::page_headers_available::hff358aa87fc6c381
                        at components/script/script_thread.rs:650
  23:        0x1035e0391 - _$LT$script..dom..servoparser..ParserContext$u20$as$u20$net_traits..FetchResponseListener$GT$::process_response::h792b9213e7266e8b
                        at components/script/dom/servoparser/mod.rs:606
  24:        0x102ab4735 - script::script_thread::{{impl}}::handle_fetch_metadata
                        at components/script/script_thread.rs:2568
  25:        0x102a9dc58 - script::script_thread::{{impl}}::handle_msg_from_constellation
                        at components/script/script_thread.rs:1263
  26:        0x102a9922a - script::script_thread::{{impl}}::handle_msgs::{{closure}}
                        at components/script/script_thread.rs:1071
  27:        0x102a99f4b - script::script_thread::{{impl}}::profile_event<closure,core::option::Option<bool>>
                        at components/script/script_thread.rs:1245
  28:        0x102a9723b - script::script_thread::{{impl}}::handle_msgs
                        at components/script/script_thread.rs:1065
  29:        0x102a95340 - script::script_thread::ScriptThread::start::h86e29495683a4ed7
                        at components/script/script_thread.rs:897
  30:        0x102a90694 - script::script_thread::{{impl}}::create::{{closure}}::{{closure}}
                        at components/script/script_thread.rs:578
  31:        0x102cfb0db - profile_traits::mem::{{impl}}::run_with_memory_reporting<closure,fn(profile_traits::mem::ReportsChan) -> script::script_runtime::CommonScriptMsg,script::script_runtime::CommonScriptMsg,std::sync::mpsc::Sender<script::script_thread::MainThreadScriptMsg>>
                        at /Users/jdm/src/servo/components/profile_traits/mem.rs:63
  32:        0x102a90c79 - script::script_thread::{{impl}}::create::{{closure}}
                        at components/script/script_thread.rs:577
  33:        0x102e15a7a - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/sys_common/backtrace.rs:134
  34:        0x102e851d3 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/mod.rs:400
  35:        0x101de564a - std::panic::{{impl}}::call_once<(),closure>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:296
  36:        0x102068692 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:480
  37:        0x10627a72c - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:99
  38:        0x101f282bc - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:459
  39:        0x101ea7625 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:361
  40:        0x102e8461b - std::thread::{{impl}}::spawn::{{closure}}<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/mod.rs:399
  41:        0x103002e03 - alloc::boxed::{{impl}}::call_box<(),closure>
                        at /Users/travis/build/rust-lang/rust/src/liballoc/boxed.rs:762
  42:        0x10626c6cb - std::sys::imp::thread::{{impl}}::new::thread_start
                        at src/libstd/sys_common/thread.rs:24
  43:     0x7fffd9f7f93a - _pthread_body
  44:     0x7fffd9f7f886 - _pthread_start
ERROR:servo: Failed to get frame id from constellation.: Io(Error { repr: Custom(Custom { kind: ConnectionReset, error: StringError("No senders exist for this port.") }) })
stack backtrace:
   0:        0x100c9e514 - backtrace::backtrace::trace<closure>
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42
   1:        0x100ca06af - backtrace::capture::Backtrace::new::h4a60748a88db7c5e
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64
   2:        0x10004a18e - servo::main::{{closure}}
                        at ports/servo/main.rs:130
   3:        0x10626d8f1 - std::panicking::rust_panic_with_hook::he6f3840a88b909da
                        at src/libstd/panicking.rs:578
   4:        0x10626d714 - std::panicking::begin_panic<alloc::string::String>
                        at src/libstd/panicking.rs:538
   5:        0x10626d662 - std::panicking::begin_panic_fmt::he894f42f5c15aa71
                        at src/libstd/panicking.rs:522
   6:        0x10626d5ca - rust_begin_unwind
                        at src/libstd/panicking.rs:498
   7:        0x1062827e3 - core::panicking::panic_fmt::h5a21022eae72748c
                        at src/libcore/panicking.rs:71
   8:        0x102ffc8e0 - core::result::unwrap_failed<alloc::boxed::Box<bincode::internal::ErrorKind>>
                        at /Users/travis/build/rust-lang/rust/src/libcore/macros.rs:23
   9:        0x102f4e594 - core::result::{{impl}}::expect<core::option::Option<msg::constellation_msg::BrowsingContextId>,alloc::boxed::Box<bincode::internal::ErrorKind>>
                        at /Users/travis/build/rust-lang/rust/src/libcore/result.rs:799
  10:        0x102aac970 - script::script_thread::{{impl}}::ask_constellation_for_browsing_context_id
                        at components/script/script_thread.rs:2019
  11:        0x102aaccff - script::script_thread::{{impl}}::remote_window_proxy
                        at components/script/script_thread.rs:2041
  12:        0x102aacf1f - script::script_thread::{{impl}}::remote_window_proxy
                        at components/script/script_thread.rs:2046
  13:        0x102aacf1f - script::script_thread::{{impl}}::remote_window_proxy
                        at components/script/script_thread.rs:2046
  14:        0x102aad576 - script::script_thread::{{impl}}::local_window_proxy
                        at components/script/script_thread.rs:2082
  15:        0x102aae8fd - script::script_thread::{{impl}}::load
                        at components/script/script_thread.rs:2166
  16:        0x102aa85bc - script::script_thread::{{impl}}::handle_page_headers_available::{{closure}}
                        at components/script/script_thread.rs:1763
  17:        0x102656db1 - core::option::{{impl}}::map<net_traits::Metadata,script::dom::bindings::root::Root<script::dom::bindings::root::Dom<script::dom::servoparser::ServoParser>>,closure>
                        at /Users/travis/build/rust-lang/rust/src/libcore/option.rs:398
  18:        0x102aa82d8 - script::script_thread::{{impl}}::handle_page_headers_available
                        at components/script/script_thread.rs:1763
  19:        0x102a919ba - script::script_thread::{{impl}}::page_headers_available::{{closure}}
                        at components/script/script_thread.rs:652
  20:        0x1017add55 - std::thread::local::{{impl}}::try_with<core::cell::Cell<core::option::Option<*const script::script_thread::ScriptThread>>,closure,core::option::Option<script::dom::bindings::root::Root<script::dom::bindings::root::Dom<script::dom::servoparser::ServoParser>>>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/local.rs:379
  21:        0x101625822 - std::thread::local::{{impl}}::with<core::cell::Cell<core::option::Option<*const script::script_thread::ScriptThread>>,closure,core::option::Option<script::dom::bindings::root::Root<script::dom::bindings::root::Dom<script::dom::servoparser::ServoParser>>>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/local.rs:293
  22:        0x102a91874 - script::script_thread::ScriptThread::page_headers_available::hff358aa87fc6c381
                        at components/script/script_thread.rs:650
  23:        0x1035e0391 - _$LT$script..dom..servoparser..ParserContext$u20$as$u20$net_traits..FetchResponseListener$GT$::process_response::h792b9213e7266e8b
                        at components/script/dom/servoparser/mod.rs:606
  24:        0x102ab4735 - script::script_thread::{{impl}}::handle_fetch_metadata
                        at components/script/script_thread.rs:2568
  25:        0x102a9dc58 - script::script_thread::{{impl}}::handle_msg_from_constellation
                        at components/script/script_thread.rs:1263
  26:        0x102a9922a - script::script_thread::{{impl}}::handle_msgs::{{closure}}
                        at components/script/script_thread.rs:1071
  27:        0x102a99f4b - script::script_thread::{{impl}}::profile_event<closure,core::option::Option<bool>>
                        at components/script/script_thread.rs:1245
  28:        0x102a9723b - script::script_thread::{{impl}}::handle_msgs
                        at components/script/script_thread.rs:1065
  29:        0x102a95340 - script::script_thread::ScriptThread::start::h86e29495683a4ed7
                        at components/script/script_thread.rs:897
  30:        0x102a90694 - script::script_thread::{{impl}}::create::{{closure}}::{{closure}}
                        at components/script/script_thread.rs:578
  31:        0x102cfb0db - profile_traits::mem::{{impl}}::run_with_memory_reporting<closure,fn(profile_traits::mem::ReportsChan) -> script::script_runtime::CommonScriptMsg,script::script_runtime::CommonScriptMsg,std::sync::mpsc::Sender<script::script_thread::MainThreadScriptMsg>>
                        at /Users/jdm/src/servo/components/profile_traits/mem.rs:63
  32:        0x102a90c79 - script::script_thread::{{impl}}::create::{{closure}}
                        at components/script/script_thread.rs:577
  33:        0x102e15a7a - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/sys_common/backtrace.rs:134
  34:        0x102e851d3 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/mod.rs:400
  35:        0x101de564a - std::panic::{{impl}}::call_once<(),closure>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:296
  36:        0x102068692 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:480
  37:        0x10627a72c - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:99
  38:        0x101f282bc - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:459
  39:        0x101ea7625 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:361
  40:        0x102e8461b - std::thread::{{impl}}::spawn::{{closure}}<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/mod.rs:399
  41:        0x103002e03 - alloc::boxed::{{impl}}::call_box<(),closure>
                        at /Users/travis/build/rust-lang/rust/src/liballoc/boxed.rs:762
  42:        0x10626c6cb - std::sys::imp::thread::{{impl}}::new::thread_start
                        at src/libstd/sys_common/thread.rs:24
  43:     0x7fffd9f7f93a - _pthread_body
  44:     0x7fffd9f7f886 - _pthread_start
ERROR:servo: Failed to get frame id from constellation.: Io(Error { repr: Custom(Custom { kind: ConnectionReset, error: StringError("No senders exist for this port.") }) })
stack backtrace:
   0:        0x100c9e514 - backtrace::backtrace::trace<closure>
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/mod.rs:42
   1:        0x100ca06af - backtrace::capture::Backtrace::new::h4a60748a88db7c5e
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64
   2:        0x10004a18e - servo::main::{{closure}}
                        at ports/servo/main.rs:130
   3:        0x10626d8f1 - std::panicking::rust_panic_with_hook::he6f3840a88b909da
                        at src/libstd/panicking.rs:578
   4:        0x10626d714 - std::panicking::begin_panic<alloc::string::String>
                        at src/libstd/panicking.rs:538
   5:        0x10626d662 - std::panicking::begin_panic_fmt::he894f42f5c15aa71
                        at src/libstd/panicking.rs:522
   6:        0x10626d5ca - rust_begin_unwind
                        at src/libstd/panicking.rs:498
   7:        0x1062827e3 - core::panicking::panic_fmt::h5a21022eae72748c
                        at src/libcore/panicking.rs:71
   8:        0x102ffc09b - core::result::unwrap_failed<std::sync::mpsc::SendError<script_layout_interface::message::Msg>>
                        at /Users/travis/build/rust-lang/rust/src/libcore/macros.rs:23
   9:        0x102f6c3b6 - core::result::{{impl}}::unwrap<(),std::sync::mpsc::SendError<script_layout_interface::message::Msg>>
                        at /Users/travis/build/rust-lang/rust/src/libcore/result.rs:772
  10:        0x103627359 - script::dom::window::Window::force_reflow::h92bc49f22635ec94
                        at components/script/dom/window.rs:1248
  11:        0x103628abe - script::dom::window::Window::reflow::hfb79c180d60c58ba
                        at components/script/dom/window.rs:1324
  12:        0x103629e6b - script::dom::window::Window::resolved_style_query::h5034ed305e6db8de
                        at components/script/dom/window.rs:1453
  13:        0x1034ae8e8 - script::dom::cssstyledeclaration::{{impl}}::get_computed_style
                        at components/script/dom/cssstyledeclaration.rs:215
  14:        0x1034ae9e5 - script::dom::cssstyledeclaration::{{impl}}::get_property_value
                        at components/script/dom/cssstyledeclaration.rs:223
  15:        0x103baa0a5 - _$LT$script..dom..cssstyledeclaration..CSSStyleDeclaration$u20$as$u20$script..dom..bindings..codegen..Bindings..CSSStyleDeclarationBinding..CSSStyleDeclarationBinding..CSSStyleDeclarationMethods$GT$::Opacity::h7d1eca653ec18424
                        at components/script/dom/cssstyledeclaration.rs:167
  16:        0x103700aeb - script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity::{{closure}}
                        at /Users/jdm/src/servo/target/debug/build/script-2f9b3bd0fd9bb690/out/Bindings/CSSStyleDeclarationBinding.rs:10806
  17:        0x1019fe527 - core::ops::function::FnOnce::call_once<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libcore/ops/function.rs:223
  18:        0x101de6ffa - std::panic::{{impl}}::call_once<bool,closure>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:296
  19:        0x102028d7c - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:480
  20:        0x10627a72c - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:99
  21:        0x101fe0e9d - std::panicking::try<bool,std::panic::AssertUnwindSafe<closure>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:459
  22:        0x101e49271 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,bool>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:361
  23:        0x10225af30 - mozjs::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,bool>
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs-0.1.7/src/panic.rs:22
  24:        0x103700a9c - script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get_opacity
                        at /Users/jdm/src/servo/target/debug/build/script-2f9b3bd0fd9bb690/out/Bindings/CSSStyleDeclarationBinding.rs:10802
  25:        0x1058f6026 - CallJitGetterOp
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs-0.1.7/src/jsglue.cpp:498
  26:        0x10347433b - script::dom::bindings::utils::generic_call
                        at components/script/dom/bindings/utils.rs:450
  27:        0x1034744b1 - script::dom::bindings::utils::generic_getter
                        at components/script/dom/bindings/utils.rs:466
  28:        0x105d77d3d - js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/jscntxtinlines.h:232
  29:        0x105d9b999 - CallGetter(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<js::Shape*>, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:631
  30:        0x105d8efc0 - js::NativeGetProperty(JSContext*, JS::Handle<js::NativeObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/NativeObject.cpp:2046
  31:        0x105c54c37 - JS_ForwardGetPropertyTo(JSContext*, JS::Handle<JSObject*>, JS::Handle<jsid>, JS::Handle<JS::Value>, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/jsapi.cpp:2527
  32:        0x10346fc5d - script::dom::bindings::utils::get_property_on_prototype
                        at components/script/dom/bindings/utils.rs:152
  33:        0x10377cf75 - script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get::{{closure}}
                        at /Users/jdm/src/servo/target/debug/build/script-2f9b3bd0fd9bb690/out/Bindings/CSSStyleDeclarationBinding.rs:30565
  34:        0x101a24057 - core::ops::function::FnOnce::call_once<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libcore/ops/function.rs:223
  35:        0x101dd8f04 - std::panic::{{impl}}::call_once<bool,closure>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:296
  36:        0x102054075 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,bool>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:480
  37:        0x10627a72c - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:99
  38:        0x101eb82f9 - std::panicking::try<bool,std::panic::AssertUnwindSafe<closure>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:459
  39:        0x101e891b6 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,bool>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:361
  40:        0x102218371 - mozjs::panic::wrap_panic<std::panic::AssertUnwindSafe<closure>,bool>
                        at /Users/jdm/src/servo/../master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs-0.1.7/src/panic.rs:22
  41:        0x10377cdfa - script::dom::bindings::codegen::Bindings::CSSStyleDeclarationBinding::CSSStyleDeclarationBinding::get
                        at /Users/jdm/src/servo/target/debug/build/script-2f9b3bd0fd9bb690/out/Bindings/CSSStyleDeclarationBinding.rs:30533
  42:        0x1058f8192 - ForwardingProxyHandler::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) const
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs-0.1.7/src/jsglue.cpp:384
  43:        0x105d127f3 - js::Proxy::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/Proxy.cpp:310
  44:        0x105d1b6e2 - js::Wrapper::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) const
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/Wrapper.cpp:143
  45:        0x105d0d1ab - js::CrossCompartmentWrapper::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>) const
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/CrossCompartmentWrapper.cpp:205
  46:        0x105d127f3 - js::Proxy::get(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/Proxy.cpp:310
  47:        0x105d6e591 - Interpret(JSContext*, js::RunState&)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter-inl.h:453
  48:        0x105d662b3 - js::RunScript(JSContext*, js::RunState&)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:399
  49:        0x105d77dc6 - js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:471
  50:        0x105d71eb9 - Interpret(JSContext*, js::RunState&)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:2873
  51:        0x105d662b3 - js::RunScript(JSContext*, js::RunState&)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:399
  52:        0x105d77dc6 - js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:471
  53:        0x105d77f85 - js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:517
  54:        0x105d1b9cb - js::Wrapper::call(JSContext*, JS::Handle<JSObject*>, JS::CallArgs const&) const
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/Wrapper.cpp:165
  55:        0x105d0da2b - js::CrossCompartmentWrapper::call(JSContext*, JS::Handle<JSObject*>, JS::CallArgs const&) const
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/CrossCompartmentWrapper.cpp:329
  56:        0x105d130b3 - js::Proxy::call(JSContext*, JS::Handle<JSObject*>, JS::CallArgs const&)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/Proxy.cpp:401
  57:        0x105d13a27 - js::proxy_Call(JSContext*, unsigned int, JS::Value*)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/proxy/Proxy.cpp:689
  58:        0x105d77e95 - js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/jscntxtinlines.h:232
  59:        0x105d77f85 - js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/vm/Interpreter.cpp:517
  60:        0x105c55847 - JS_CallFunctionValue(JSContext*, JS::Handle<JSObject*>, JS::Handle<JS::Value>, JS::HandleValueArray const&, JS::MutableHandle<JS::Value>)
                        at /Users/jdm/src/master-servo/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.50.0/mozjs/js/src/jsapi.cpp:2781
  61:        0x103b24af7 - script::dom::bindings::codegen::Bindings::WindowBinding::FrameRequestCallback::Call::h73ac7efad33414e3
                        at /Users/jdm/src/servo/target/debug/build/script-2f9b3bd0fd9bb690/out/Bindings/WindowBinding.rs:492
  62:        0x103b241a8 - script::dom::bindings::codegen::Bindings::WindowBinding::FrameRequestCallback::Call__::h617676a0903a9ca6
                        at /Users/jdm/src/servo/target/debug/build/script-2f9b3bd0fd9bb690/out/Bindings/WindowBinding.rs:471
  63:        0x102a45900 - script::dom::document::{{impl}}::call
                        at components/script/dom/document.rs:4000
  64:        0x102a2e563 - script::dom::document::Document::run_the_animation_frame_callbacks::ha0bfb184963a8cd6
                        at components/script/dom/document.rs:1526
  65:        0x102aaaffa - script::script_thread::{{impl}}::handle_tick_all_animations
                        at components/script/script_thread.rs:1918
  66:        0x102a9d64f - script::script_thread::{{impl}}::handle_msg_from_constellation
                        at components/script/script_thread.rs:1304
  67:        0x102a9922a - script::script_thread::{{impl}}::handle_msgs::{{closure}}
                        at components/script/script_thread.rs:1071
  68:        0x102a99f4b - script::script_thread::{{impl}}::profile_event<closure,core::option::Option<bool>>
                        at components/script/script_thread.rs:1245
  69:        0x102a9723b - script::script_thread::{{impl}}::handle_msgs
                        at components/script/script_thread.rs:1065
  70:        0x102a95340 - script::script_thread::ScriptThread::start::h86e29495683a4ed7
                        at components/script/script_thread.rs:897
  71:        0x102a90694 - script::script_thread::{{impl}}::create::{{closure}}::{{closure}}
                        at components/script/script_thread.rs:578
  72:        0x102cfb0db - profile_traits::mem::{{impl}}::run_with_memory_reporting<closure,fn(profile_traits::mem::ReportsChan) -> script::script_runtime::CommonScriptMsg,script::script_runtime::CommonScriptMsg,std::sync::mpsc::Sender<script::script_thread::MainThreadScriptMsg>>
                        at /Users/jdm/src/servo/components/profile_traits/mem.rs:63
  73:        0x102a90c79 - script::script_thread::{{impl}}::create::{{closure}}
                        at components/script/script_thread.rs:577
  74:        0x102e15a7a - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/sys_common/backtrace.rs:134
  75:        0x102e851d3 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/mod.rs:400
  76:        0x101de564a - std::panic::{{impl}}::call_once<(),closure>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:296
  77:        0x102068692 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:480
  78:        0x10627a72c - __rust_maybe_catch_panic
                        at src/libpanic_unwind/lib.rs:99
  79:        0x101f282bc - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panicking.rs:459
  80:        0x101ea7625 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/panic.rs:361
  81:        0x102e8461b - std::thread::{{impl}}::spawn::{{closure}}<closure,()>
                        at /Users/travis/build/rust-lang/rust/src/libstd/thread/mod.rs:399
  82:        0x103002e03 - alloc::boxed::{{impl}}::call_box<(),closure>
                        at /Users/travis/build/rust-lang/rust/src/liballoc/boxed.rs:762
  83:        0x10626c6cb - std::sys::imp::thread::{{impl}}::new::thread_start
                        at src/libstd/sys_common/thread.rs:24
  84:     0x7fffd9f7f93a - _pthread_body
  85:     0x7fffd9f7f886 - _pthread_start
ERROR:servo: called `Result::unwrap()` on an `Err` value: "SendError(..)"

jdm · 2017-11-09T23:33:38Z

This is probably the same underlying problem as #19170.

jdm added the I-panic label Nov 9, 2017

servo / servo

Panic (unreachable layout channel) when refreshing arstechnica.com #19168

Panic (unreachable layout channel) when refreshing arstechnica.com #19168

jdm commented Nov 9, 2017

jdm commented Nov 9, 2017

jdm commented Nov 9, 2017

jdm commented Nov 9, 2017

servo / servo

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Panic (unreachable layout channel) when refreshing arstechnica.com #19168

Panic (unreachable layout channel) when refreshing arstechnica.com #19168

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jdm commented Nov 9, 2017

jdm commented Nov 9, 2017

jdm commented Nov 9, 2017

jdm commented Nov 9, 2017