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Implement microtask checkpoints #15189

Merged
merged 3 commits into from Feb 3, 2017
Merged

Implement microtask checkpoints #15189

merged 3 commits into from Feb 3, 2017

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@jdm
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jdm commented Jan 25, 2017

This generalizes the work previously done for Promise job callbacks. There is now a microtask queue that correctly processes all queued microtasks after each turn of the event loop, as well as after a scripted callback finishes executing, and after a classic script executes.


  • ./mach build -d does not report any errors
  • ./mach test-tidy does not report any errors
  • These changes fix #4283
  • There are tests for these changes

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@highfive

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highfive commented Jan 25, 2017

Heads up! This PR modifies the following files:

  • @fitzgen: components/script/lib.rs, components/script/microtask.rs, components/script/dom/globalscope.rs, components/script/dom/workerglobalscope.rs, components/script/dom/bindings/settings_stack.rs, components/script/dom/dedicatedworkerglobalscope.rs, components/script/dom/htmlscriptelement.rs, components/script/script_thread.rs, components/script/script_runtime.rs, components/script/dom/serviceworkerglobalscope.rs
  • @KiChjang: components/script/lib.rs, components/script/microtask.rs, components/script/dom/globalscope.rs, components/script/dom/workerglobalscope.rs, components/script/dom/bindings/settings_stack.rs, components/script/dom/dedicatedworkerglobalscope.rs, components/script/dom/htmlscriptelement.rs, components/script/script_thread.rs, components/script/script_runtime.rs, components/script/dom/serviceworkerglobalscope.rs
@jdm jdm force-pushed the jdm:microtasks branch from 47658cb to 1da28b5 Jan 25, 2017
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Just some comments.

assert_eq!(&*entry.global as *const GlobalScope as usize,
self.global,
assert_eq!(&*entry.global as *const GlobalScope,
&*self.global as *const GlobalScope,

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@nox

nox Jan 25, 2017

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I think all DOM structs implement PartialEq with pointer equality.

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@jdm

jdm Jan 25, 2017

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The compiler complains that &GlobalScope doesn't implement the Debug trait if I get rid of the pointer casts.

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nox Jan 25, 2017

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Oh I see. I guess that's ok. Alternatively you can use assert!(... == ...); but that reports a less detailed panic.


impl MicrotaskQueue {
/// Create a new PromiseJobQueue instance.
pub fn new() -> MicrotaskQueue {

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nox Jan 25, 2017

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You could also use Default.

}
// N.B. borrowing this vector is safe w.r.t. mutability, since any promise job that
// is enqueued while invoking these callbacks will be placed in `pending_queue`;
// `flushing_queue` is a static snapshot during this checkpoint.

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nox Jan 25, 2017

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Why not just replace by an empty vector, like we do in Document::run_the_animation_frame_callbacks?

@@ -564,6 +565,13 @@ impl ScriptThreadFactory for ScriptThread {
}

impl ScriptThread {
pub fn invoke_perform_a_microtask_checkpoint() {
SCRIPT_THREAD_ROOT.with(|root| {
let script_thread = root.as_ref().unwrap();

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I think this was reverted and you need to rebase. :(

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Manishearth commented Jan 25, 2017

r? @nox

@highfive highfive assigned nox and unassigned Manishearth Jan 25, 2017
@jdm jdm added the S-needs-rebase label Jan 25, 2017
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Very nice work.

@@ -241,6 +241,7 @@ impl DedicatedWorkerGlobalScope {
break;
}
global.handle_event(event);
global.upcast::<WorkerGlobalScope>().perform_a_microtask_checkpoint();

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Could you put a spec link as to why we perform a checkpoint here?

/// in FIFO order, synchronously, at some point in the future.
pub fn flush_promise_jobs(&self) {
/// Perform a microtask checkpoint.
pub fn perform_a_microtask_checkpoint(&self) {

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Spec link.

/// Enqueue a promise callback for subsequent execution.
pub fn enqueue_promise_job(&self, job: EnqueuedPromiseCallback) {
/// Enqueue a microtask for subsequent execution.
pub fn enqueue_microtask(&self, job: Microtask) {

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Spec link.

@@ -214,6 +214,7 @@ impl ServiceWorkerGlobalScope {
if !global.handle_event(event) {
break;
}
global.upcast::<WorkerGlobalScope>().perform_a_microtask_checkpoint();

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Spec link?

@@ -159,20 +158,12 @@ impl WorkerGlobalScope {
}
}

pub fn enqueue_promise_job(&self, job: EnqueuedPromiseCallback) {
self.promise_job_queue.enqueue(job, self.upcast());
pub fn enqueue_microtask(&self, job: Microtask) {

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Spec link.


fn do_flush_promise_jobs(&self) {
self.promise_job_queue.flush_promise_jobs(|id| {
pub fn perform_a_microtask_checkpoint(&self) {

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Spec link.


/// A collection of microtasks in FIFO order.
#[derive(JSTraceable, HeapSizeOf)]
pub struct MicrotaskQueue {

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Could you put this first, then Microtask, then EnqueuedPromiseCallback?

});

// Step 5
if !thread::panicking() && incumbent_global().is_none() {

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@Ms2ger

Ms2ger Jan 25, 2017

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I don't know that this check is correct, mostly because I don't know what the correct check is.

// TODO use a settings object rather than this element's document/window
// Step 2
let document = document_from_node(self);
if !document.is_fully_active() || !document.is_scripting_enabled() {

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Ms2ger Jan 25, 2017

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Do these additional checks make any tests pass?

* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use dom::bindings::callback::ExceptionHandling;

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Ms2ger Jan 25, 2017

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A line of top-level documentation here, please.

pub struct MicrotaskQueue {
/// A snapshot of `microtask_queue` that was taken at the start of the microtask checkpoint.
/// Used to work around mutability errors when appending new microtasks while performing
/// a microtask checkpoint.

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Ms2ger Jan 25, 2017

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Add a note that this would be a local variable if it wasn't for rooting concerns.

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jdm commented Jan 25, 2017

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bors-servo commented Jan 25, 2017

⌛️ Trying commit 1da28b5 with merge 534ca6d...

bors-servo added a commit that referenced this pull request Jan 25, 2017
Implement microtask checkpoints

This generalizes the work previously done for Promise job callbacks. There is now a microtask queue that correctly processes all queued microtasks after each turn of the event loop, as well as after a scripted callback finishes executing, and after a classic script executes.

---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #4283
- [X] There are tests for these changes

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15189)
<!-- Reviewable:end -->
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bors-servo commented Jan 25, 2017

💔 Test failed - mac-dev-unit

@jdm jdm force-pushed the jdm:microtasks branch from 1da28b5 to fe15278 Jan 25, 2017
@jdm jdm removed the S-needs-rebase label Jan 25, 2017
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jdm commented Jan 25, 2017

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bors-servo commented Jan 25, 2017

⌛️ Trying commit fe15278 with merge 5cad7fa...

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bors-servo commented Jan 25, 2017

💔 Test failed - linux-dev

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jdm commented Jan 25, 2017

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bors-servo commented Jan 25, 2017

⌛️ Trying commit dc0165a with merge af725e3...

bors-servo added a commit that referenced this pull request Jan 25, 2017
Implement microtask checkpoints

This generalizes the work previously done for Promise job callbacks. There is now a microtask queue that correctly processes all queued microtasks after each turn of the event loop, as well as after a scripted callback finishes executing, and after a classic script executes.

---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #4283
- [X] There are tests for these changes

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15189)
<!-- Reviewable:end -->
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bors-servo commented Jan 25, 2017

💔 Test failed - linux-rel-wpt

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jdm commented Jan 25, 2017

  ▶ TIMEOUT [expected OK] /XMLHttpRequest/send-entity-body-document.htm
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  └ 3.3 (Core Profile) Mesa 12.0.1

  ▶ CRASH [expected OK] /fetch/api/basic/accept-header-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/accept-header.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f29c97a73dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f29c97a7ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f29c7f8c707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f29c9e20e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f29c9e20d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f29c9e20c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f29c9e20c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f29c9e4e27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f29c9e4e1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f29c86bb93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f29c847b630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f29c9e27dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f29c898303b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f29c8b87bb4 - CallJitMethodOp
  │   14:     0x7f29c865cd34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f29ca7ce82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/basic/mode-same-origin-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/mode-same-origin.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fbb573023dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fbb57302ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fbb55ae7707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fbb5797be88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fbb5797bd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fbb5797bc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fbb5797bc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fbb579a927d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fbb579a91b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fbb5621693a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fbb55fd6630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fbb57982dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fbb564de03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fbb566e2bb4 - CallJitMethodOp
  │   14:     0x7fbb561b7d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fbb5842d82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/integrity-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/integrity.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f933222c3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f933222cad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f9330a11707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f93328a5e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f93328a5d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f93328a5c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f93328a5c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f93328d327d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f93328d31b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f933114093a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f9330f00630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f93328acdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f933140803b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f933160cbb4 - CallJitMethodOp
  │   14:     0x7f93310e1d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f933335782c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/basic/mode-no-cors-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/mode-no-cors.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fce8da523dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fce8da52ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fce8c237707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fce8e0cbe88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fce8e0cbd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fce8e0cbc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fce8e0cbc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fce8e0f927d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fce8e0f91b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fce8c96693a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fce8c726630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fce8e0d2dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fce8cc2e03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fce8ce32bb4 - CallJitMethodOp
  │   14:     0x7fce8c907d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fce8eb7c82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/referrer-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/referrer.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f14aea373dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f14aea37ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f14ad21c707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f14af0b0e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f14af0b0d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f14af0b0c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f14af0b0c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f14af0de27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f14af0de1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f14ad94b93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f14ad70b630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f14af0b7dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f14adc1303b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f14ade17bb4 - CallJitMethodOp
  │   14:     0x7f14ad8ecd34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f14afb5e82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/basic/request-forbidden-headers-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/request-forbidden-headers.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f60e63243dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f60e6324ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f60e4b09707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f60e699de88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f60e699dd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f60e699dc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f60e699dc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f60e69cb27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f60e69cb1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f60e523893a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f60e4ff8630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f60e69a4dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f60e550003b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f60e5704bb4 - CallJitMethodOp
  │   14:     0x7f60e51d9d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f60e744f82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/request-upload-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/request-upload.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fdb1bae53dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fdb1bae5ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fdb1a2ca707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fdb1c15ee88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fdb1c15ed54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fdb1c15ec79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fdb1c15ec07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fdb1c18c27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fdb1c18c1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fdb1a9f993a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fdb1a7b9630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fdb1c165dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fdb1acc103b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fdb1aec5bb4 - CallJitMethodOp
  │   14:     0x7fdb1a99ad34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fdb1cc1082c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/request-headers-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/request-headers.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fd33985e3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fd33985ead2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fd338043707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fd339ed7e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fd339ed7d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fd339ed7c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fd339ed7c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fd339f0527d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fd339f051b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fd33877293a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fd338532630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fd339ededca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fd338a3a03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fd338c3ebb4 - CallJitMethodOp
  │   14:     0x7fd338713d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fd33a98982c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/basic/response-url-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/response-url.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f986da263dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f986da26ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f986c20b707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f986e09fe88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f986e09fd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f986e09fc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f986e09fc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f986e0cd27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f986e0cd1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f986c93a93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f986c6fa630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f986e0a6dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f986cc0203b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f986ce06bb4 - CallJitMethodOp
  │   14:     0x7f986c8dbd34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f986eb4d82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/basic/scheme-about-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/scheme-about.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f4a3d08f3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f4a3d08fad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f4a3b874707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f4a3d708e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f4a3d708d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f4a3d708c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f4a3d708c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f4a3d73627d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f4a3d7361b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f4a3bfa393a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f4a3bd63630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f4a3d70fdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f4a3c26b03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f4a3c46fbb4 - CallJitMethodOp
  │   14:     0x7f4a3bf44d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f4a3e0b682c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/scheme-others-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/scheme-others.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fd8523013dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fd852301ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fd850ae6707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fd85297ae88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fd85297ad54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fd85297ac79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fd85297ac07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fd8529a827d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fd8529a81b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fd85121593a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fd850fd5630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fd852981dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fd8514dd03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fd8516e1bb4 - CallJitMethodOp
  │   14:     0x7fd8511b6d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fd85342a82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/scheme-blob-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ Loading blob blob:http://web-platform.test:8000/37f6483292d6425799e1ff13b94c3eca
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/scheme-blob.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f9ef90633dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f9ef9063ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f9ef7848707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f9ef96dce88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f9ef96dcd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f9ef96dcc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f9ef96dcc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f9ef970a27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f9ef970a1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f9ef7f7793a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f9ef7d37630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f9ef96e3dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f9ef823f03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f9ef8443bb4 - CallJitMethodOp
  │   14:     0x7f9ef7f18d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f9efa18c82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/basic/scheme-data-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/scheme-data.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f16535a43dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f16535a4ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f1651d89707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f1653c1de88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f1653c1dd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f1653c1dc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f1653c1dc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f1653c4b27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f1653c4b1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f16524b893a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f1652278630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f1653c24dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f165278003b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f1652984bb4 - CallJitMethodOp
  │   14:     0x7f1652459d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f16545ce82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/scheme-data.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f16535a43dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f16535a4ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f1651d89707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f1653c1de88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f1653c1dd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f1653c1dc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f1653c1dc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f1653c4b27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f1653c4b1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f1652442f6f - <script::dom::bindings::js::Root<T>>::new::h544e96e7a3114e11
  │   10:     0x7f1652519de5 - script::dom::globalscope::global_scope_from_global::h61c1c7d4458856dc
  │   11:     0x7f16525af13b - <script::dom::promise::Promise as core::ops::Drop>::drop::hd3fd445755a44ed9
  │   12:     0x7f165236e70c - drop::hdd0980f4b8073ff2
  │   13:     0x7f165236a378 - drop::hc4d3efa2f23602ab
  │   14:     0x7f1652170717 - std::sys::imp::fast_thread_local::destroy_value::h3a76b454f8ff048f
  │   15:     0x7f164f6ae825 - __call_tls_dtors
  │   16:     0x7f164fc55191 - start_thread
  │   17:     0x7f164f76c37c - clone
  │   18:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ fatal runtime error: failed to initiate panic, error 5
  │ Redirecting call to abort() to mozalloc_abort
  │ 
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/basic/stream-response-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/basic/stream-response.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f1584d983dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f1584d98ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f158357d707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f1585411e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f1585411d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f1585411c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f1585411c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f158543f27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f158543f1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f1583cac93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f1583a6c630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f1585418dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f1583f7403b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f1584178bb4 - CallJitMethodOp
  │   14:     0x7f1583c4dd34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f1585ec482c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/cors/cors-filtering-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-filtering.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f0f4cef43dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f0f4cef4ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f0f4b6d9707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f0f4d56de88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f0f4d56dd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f0f4d56dc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f0f4d56dc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f0f4d59b27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f0f4d59b1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f0f4be0893a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f0f4bbc8630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f0f4d574dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f0f4c0d003b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f0f4c2d4bb4 - CallJitMethodOp
  │   14:     0x7f0f4bda9d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f0f4e01e82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/cors/cors-multiple-origins-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-multiple-origins.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f8a77c413dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f8a77c41ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f8a76426707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f8a782bae88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f8a782bad54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f8a782bac79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f8a782bac07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f8a782e827d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f8a782e81b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f8a76b5593a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f8a76915630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f8a782c1dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f8a76e1d03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f8a77021bb4 - CallJitMethodOp
  │   14:     0x7f8a76af6d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f8a78d6a82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/cors/cors-basic-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-basic.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f0b1162f3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f0b1162fad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f0b0fe14707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f0b11ca8e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f0b11ca8d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f0b11ca8c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f0b11ca8c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f0b11cd627d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f0b11cd61b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f0b1054393a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f0b10303630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f0b11cafdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f0b1080b03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f0b10a0fbb4 - CallJitMethodOp
  │   14:     0x7f0b104e4d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f0b1275682c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/cors/cors-preflight-referrer-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-preflight-referrer.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f34afae23dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f34afae2ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f34ae2c7707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f34b015be88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f34b015bd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f34b015bc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f34b015bc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f34b018927d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f34b01891b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f34ae9f693a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f34ae7b6630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f34b0162dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f34aecbe03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f34aeec2bb4 - CallJitMethodOp
  │   14:     0x7f34ae997d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f34b0afe82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/credentials/authentication-basic-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/credentials/authentication-basic.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fd1dccda3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fd1dccdaad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fd1db4bf707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fd1dd353e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fd1dd353d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fd1dd353c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fd1dd353c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fd1dd38127d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fd1dd3811b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fd1dbbee93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fd1db9ae630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fd1dd35adca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fd1dbeb603b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fd1dc0babb4 - CallJitMethodOp
  │   14:     0x7fd1dbb8fd34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fd1ddcfe82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/credentials/authentication-basic.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/policies/referrer-no-referrer-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/policies/referrer-no-referrer.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fd93ac733dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fd93ac73ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fd939458707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fd93b2ece88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fd93b2ecd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fd93b2ecc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fd93b2ecc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fd93b31a27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fd93b31a1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fd939b8793a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fd939947630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fd93b2f3dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fd939e4f03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fd93a053bb4 - CallJitMethodOp
  │   14:     0x7fd939b28d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fd93bd9e82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/policies/csp-blocked-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/policies/csp-blocked.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fc1030213dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fc103021ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fc101806707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fc10369ae88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fc10369ad54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fc10369ac79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fc10369ac07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fc1036c827d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fc1036c81b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fc101f3593a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7fc101cf5630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7fc1036a1dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7fc1021fd03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7fc102401bb4 - CallJitMethodOp
  │   14:     0x7fc101ed6d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7fc10414882c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/policies/referrer-origin-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/policies/referrer-origin.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f0dfe96f3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f0dfe96fad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f0dfd154707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f0dfefe8e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f0dfefe8d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f0dfefe8c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f0dfefe8c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f0dff01627d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f0dff0161b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f0dfd88393a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f0dfd643630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f0dfefefdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f0dfdb4b03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f0dfdd4fbb4 - CallJitMethodOp
  │   14:     0x7f0dfd824d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f0dffa9882c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/cors/cors-origin-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-origin.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f4efb1e63dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f4efb1e6ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f4ef99cb707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f4efb85fe88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f4efb85fd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f4efb85fc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f4efb85fc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f4efb88d27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f4efb88d1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f4efa291989 - script::dom::workerglobalscope::WorkerGlobalScope::script_chan::h237e31761efa000a
  │   10:     0x7f4efa158806 - script::dom::globalscope::GlobalScope::networking_task_source::h8eeaf6db8461abd0
  │   11:     0x7f4efa29f640 - script::fetch::Fetch::h8a07e180699336ca
  │   12:     0x7f4ef9ec8da3 - std::panicking::try::do_call::ha8ecc4031866dd4d
  │   13:     0x7f4efb866dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   14:     0x7f4efa59dcab - script::dom::bindings::codegen::Bindings::WorkerGlobalScopeBinding::WorkerGlobalScopeBinding::fetch::h85e4ed58deb70bd9
  │   15:     0x7f4efa5c6bb4 - CallJitMethodOp
  │   16:     0x7f4efa09bd34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   17:     0x7f4efa9228c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   18:     0x7f4efa91523e - CallFromStack
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:504
  │                          - Interpret
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:2873
  │   19:     0x7f4efa92248b - 2js9RunScriptEP9JSContextRNS_8RunState
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:399
  │   20:     0x7f4efa922668 - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:471
  │   21:     0x7f4efa922a74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   22:     0x7f4efaa047bf - 2js18PromiseReactionJobEP9JSContextjPN2JS5Value
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/builtin/Promise.cpp:479
  │   23:     0x7f4efa9228c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   24:     0x7f4efa922a74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   25:     0x7f4efa7b9160 - _Z20JS_CallFunctionValueP9JSContextN2JS6HandleIP8JSObjectEENS2_INS1_5ValueEEERKNS1_16HandleValueArrayENS1_13MutableHandleIS6_EE
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jsapi.cpp:2781
  │   26:     0x7f4efa4c46bf - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call::h73a3e35321764eab
  │   27:     0x7f4efa4c437f - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call_::h6a636b71f64a54d5
  │   28:     0x7f4efa2ac31f - script::microtask::MicrotaskQueue::checkpoint::h5f43e839c25e44f1
  │   29:     0x7f4efa0f7576 - script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope::run_worker_scope::{{closure}}::{{closure}}::ha2a27a63451cb059
  │   30:     0x7f4ef9e5b453 - std::panicking::try::do_call::h681cf90a3dcfd59f
  │   31:     0x7f4efb866dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   32:     0x7f4ef9fb6ee7 - <F as alloc::boxed::FnBox<A>>::call_box::hae4f14c8b34be311
  │   33:     0x7f4efb85eb14 - alloc::boxed::{{impl}}::call_once<(),()>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
  │                          - std::sys_common::thread::start_thread
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
  │                          - std::sys::imp::thread::{{impl}}::new::thread_start
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  │   34:     0x7f4ef7897183 - start_thread
  │   35:     0x7f4ef73ae37c - clone
  │   36:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/redirect/redirect-mode-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/redirect/redirect-mode.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f1cda71b3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f1cda71bad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f1cd8f00707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f1cdad94e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f1cdad94d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f1cdad94c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f1cdad94c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f1cdadc227d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f1cdadc21b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f1cd962f93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f1cd93ef630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f1cdad9bdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f1cd98f703b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f1cd9afbbb4 - CallJitMethodOp
  │   14:     0x7f1cd95d0d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f1cdb84482c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/redirect/redirect-mode.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/policies/referrer-origin-when-cross-origin-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/policies/referrer-origin-when-cross-origin.js?pipe=sub, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7ff3fa2ee3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7ff3fa2eead2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7ff3f8ad3707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7ff3fa967e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7ff3fa967d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7ff3fa967c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7ff3fa967c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7ff3fa99527d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7ff3fa9951b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7ff3f920293a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7ff3f8fc2630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7ff3fa96edca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7ff3f94ca03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7ff3f96cebb4 - CallJitMethodOp
  │   14:     0x7ff3f91a3d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7ff3fb41582c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/policies/referrer-unsafe-url-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/policies/referrer-unsafe-url.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f2af3c743dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f2af3c74ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f2af2459707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f2af42ede88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f2af42edd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f2af42edc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f2af42edc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f2af431b27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f2af431b1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f2af2b8893a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f2af2948630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f2af42f4dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f2af2e5003b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f2af3054bb4 - CallJitMethodOp
  │   14:     0x7f2af2b29d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f2af4d9f82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/redirect/redirect-to-dataurl-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/redirect/redirect-to-dataurl.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f1bdc3c33dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f1bdc3c3ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f1bdaba8707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f1bdca3ce88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f1bdca3cd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f1bdca3cc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f1bdca3cc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f1bdca6a27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f1bdca6a1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f1bdb2d793a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f1bdb097630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f1bdca43dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f1bdb59f03b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f1bdb7a3bb4 - CallJitMethodOp
  │   14:     0x7f1bdb278d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f1bdd50e82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/redirect/redirect-method-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/redirect/redirect-method.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f7bfdebb3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f7bfdebbad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f7bfc6a0707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f7bfe534e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f7bfe534d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f7bfe534c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f7bfe534c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f7bfe56227d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f7bfe5621b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f7bfcdcf93a - <script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope as script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods>::PostMessage::hc505b6a095572763
  │   10:     0x7f7bfcb8f630 - std::panicking::try::do_call::ha0f1a4b739b956b5
  │   11:     0x7f7bfe53bdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   12:     0x7f7bfd09703b - script::dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeBinding::postMessage::hc9cbbf1b15eaf0d3
  │   13:     0x7f7bfd29bbb4 - CallJitMethodOp
  │   14:     0x7f7bfcd70d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   15:     0x7f7bfeede82c - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/cors/cors-cookies-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-cookies.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fc4223c13dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fc4223c1ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fc420ba6707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fc422a3ae88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fc422a3ad54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fc422a3ac79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fc422a3ac07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fc422a6827d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fc422a681b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fc42146c989 - script::dom::workerglobalscope::WorkerGlobalScope::script_chan::h237e31761efa000a
  │   10:     0x7fc421333806 - script::dom::globalscope::GlobalScope::networking_task_source::h8eeaf6db8461abd0
  │   11:     0x7fc42147a640 - script::fetch::Fetch::h8a07e180699336ca
  │   12:     0x7fc4210a3da3 - std::panicking::try::do_call::ha8ecc4031866dd4d
  │   13:     0x7fc422a41dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   14:     0x7fc421778cab - script::dom::bindings::codegen::Bindings::WorkerGlobalScopeBinding::WorkerGlobalScopeBinding::fetch::h85e4ed58deb70bd9
  │   15:     0x7fc4217a1bb4 - CallJitMethodOp
  │   16:     0x7fc421276d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   17:     0x7fc421afd8c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   18:     0x7fc421af023e - CallFromStack
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:504
  │                          - Interpret
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:2873
  │   19:     0x7fc421afd48b - 2js9RunScriptEP9JSContextRNS_8RunState
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:399
  │   20:     0x7fc421afd668 - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:471
  │   21:     0x7fc421afda74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   22:     0x7fc421bdf7bf - 2js18PromiseReactionJobEP9JSContextjPN2JS5Value
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/builtin/Promise.cpp:479
  │   23:     0x7fc421afd8c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   24:     0x7fc421afda74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   25:     0x7fc421994160 - _Z20JS_CallFunctionValueP9JSContextN2JS6HandleIP8JSObjectEENS2_INS1_5ValueEEERKNS1_16HandleValueArrayENS1_13MutableHandleIS6_EE
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jsapi.cpp:2781
  │   26:     0x7fc42169f6bf - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call::h73a3e35321764eab
  │   27:     0x7fc42169f37f - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call_::h6a636b71f64a54d5
  │   28:     0x7fc42148731f - script::microtask::MicrotaskQueue::checkpoint::h5f43e839c25e44f1
  │   29:     0x7fc4212d2576 - script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope::run_worker_scope::{{closure}}::{{closure}}::ha2a27a63451cb059
  │   30:     0x7fc421036453 - std::panicking::try::do_call::h681cf90a3dcfd59f
  │   31:     0x7fc422a41dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   32:     0x7fc421191ee7 - <F as alloc::boxed::FnBox<A>>::call_box::hae4f14c8b34be311
  │   33:     0x7fc422a39b14 - alloc::boxed::{{impl}}::call_once<(),()>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
  │                          - std::sys_common::thread::start_thread
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
  │                          - std::sys::imp::thread::{{impl}}::new::thread_start
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  │   34:     0x7fc41ea72183 - start_thread
  │   35:     0x7fc41e58937c - clone
  │   36:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/cors/cors-no-preflight-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-no-preflight.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f7c294093dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f7c29409ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f7c27bee707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f7c29a82e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f7c29a82d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f7c29a82c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f7c29a82c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f7c29ab027d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f7c29ab01b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f7c284b4989 - script::dom::workerglobalscope::WorkerGlobalScope::script_chan::h237e31761efa000a
  │   10:     0x7f7c2837b806 - script::dom::globalscope::GlobalScope::networking_task_source::h8eeaf6db8461abd0
  │   11:     0x7f7c284c2640 - script::fetch::Fetch::h8a07e180699336ca
  │   12:     0x7f7c280ebda3 - std::panicking::try::do_call::ha8ecc4031866dd4d
  │   13:     0x7f7c29a89dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   14:     0x7f7c287c0cab - script::dom::bindings::codegen::Bindings::WorkerGlobalScopeBinding::WorkerGlobalScopeBinding::fetch::h85e4ed58deb70bd9
  │   15:     0x7f7c287e9bb4 - CallJitMethodOp
  │   16:     0x7f7c282bed34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   17:     0x7f7c28b458c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   18:     0x7f7c28b3823e - CallFromStack
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:504
  │                          - Interpret
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:2873
  │   19:     0x7f7c28b4548b - 2js9RunScriptEP9JSContextRNS_8RunState
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:399
  │   20:     0x7f7c28b45668 - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:471
  │   21:     0x7f7c28b45a74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   22:     0x7f7c28c277bf - 2js18PromiseReactionJobEP9JSContextjPN2JS5Value
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/builtin/Promise.cpp:479
  │   23:     0x7f7c28b458c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   24:     0x7f7c28b45a74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   25:     0x7f7c289dc160 - _Z20JS_CallFunctionValueP9JSContextN2JS6HandleIP8JSObjectEENS2_INS1_5ValueEEERKNS1_16HandleValueArrayENS1_13MutableHandleIS6_EE
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jsapi.cpp:2781
  │   26:     0x7f7c286e76bf - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call::h73a3e35321764eab
  │   27:     0x7f7c286e737f - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call_::h6a636b71f64a54d5
  │   28:     0x7f7c284cf31f - script::microtask::MicrotaskQueue::checkpoint::h5f43e839c25e44f1
  │   29:     0x7f7c2831a576 - script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope::run_worker_scope::{{closure}}::{{closure}}::ha2a27a63451cb059
  │   30:     0x7f7c2807e453 - std::panicking::try::do_call::h681cf90a3dcfd59f
  │   31:     0x7f7c29a89dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   32:     0x7f7c281d9ee7 - <F as alloc::boxed::FnBox<A>>::call_box::hae4f14c8b34be311
  │   33:     0x7f7c29a81b14 - alloc::boxed::{{impl}}::call_once<(),()>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
  │                          - std::sys_common::thread::start_thread
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
  │                          - std::sys::imp::thread::{{impl}}::new::thread_start
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  │   34:     0x7f7c25aba183 - start_thread
  │   35:     0x7f7c255d137c - clone
  │   36:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /fetch/api/cors/cors-preflight-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/cors/cors-preflight.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7fc5803833dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7fc580383ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7fc57eb68707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7fc5809fce88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7fc5809fcd54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7fc5809fcc79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7fc5809fcc07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7fc580a2a27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7fc580a2a1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7fc57f42e989 - script::dom::workerglobalscope::WorkerGlobalScope::script_chan::h237e31761efa000a
  │   10:     0x7fc57f2f5806 - script::dom::globalscope::GlobalScope::networking_task_source::h8eeaf6db8461abd0
  │   11:     0x7fc57f43c640 - script::fetch::Fetch::h8a07e180699336ca
  │   12:     0x7fc57f065da3 - std::panicking::try::do_call::ha8ecc4031866dd4d
  │   13:     0x7fc580a03dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   14:     0x7fc57f73acab - script::dom::bindings::codegen::Bindings::WorkerGlobalScopeBinding::WorkerGlobalScopeBinding::fetch::h85e4ed58deb70bd9
  │   15:     0x7fc57f763bb4 - CallJitMethodOp
  │   16:     0x7fc57f238d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   17:     0x7fc57fabf8c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   18:     0x7fc57fab223e - CallFromStack
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:504
  │                          - Interpret
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:2873
  │   19:     0x7fc57fabf48b - 2js9RunScriptEP9JSContextRNS_8RunState
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:399
  │   20:     0x7fc57fabf668 - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:471
  │   21:     0x7fc57fabfa74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   22:     0x7fc57fba17bf - 2js18PromiseReactionJobEP9JSContextjPN2JS5Value
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/builtin/Promise.cpp:479
  │   23:     0x7fc57fabf8c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   24:     0x7fc57fabfa74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   25:     0x7fc57f956160 - _Z20JS_CallFunctionValueP9JSContextN2JS6HandleIP8JSObjectEENS2_INS1_5ValueEEERKNS1_16HandleValueArrayENS1_13MutableHandleIS6_EE
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jsapi.cpp:2781
  │   26:     0x7fc57f6616bf - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call::h73a3e35321764eab
  │   27:     0x7fc57f66137f - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call_::h6a636b71f64a54d5
  │   28:     0x7fc57f44931f - script::microtask::MicrotaskQueue::checkpoint::h5f43e839c25e44f1
  │   29:     0x7fc57f294576 - script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope::run_worker_scope::{{closure}}::{{closure}}::ha2a27a63451cb059
  │   30:     0x7fc57eff8453 - std::panicking::try::do_call::h681cf90a3dcfd59f
  │   31:     0x7fc580a03dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   32:     0x7fc57f153ee7 - <F as alloc::boxed::FnBox<A>>::call_box::hae4f14c8b34be311
  │   33:     0x7fc5809fbb14 - alloc::boxed::{{impl}}::call_once<(),()>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
  │                          - std::sys_common::thread::start_thread
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
  │                          - std::sys::imp::thread::{{impl}}::new::thread_start
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  │   34:     0x7fc57ca34183 - start_thread
  │   35:     0x7fc57c54b37c - clone
  │   36:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  │ Pipeline failed in hard-fail mode.  Crashing!
  │ thread panicked while processing panic. aborting.
  └ thread panicked while processing panic. aborting.

  ▶ CRASH [expected OK] /fetch/api/credentials/cookies-worker.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread WebWorker for http://web-platform.test:8000/fetch/api/credentials/cookies.js, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f3d80e3c3dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f3d80e3cad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f3d7f621707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f3d814b5e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f3d814b5d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f3d814b5c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f3d814b5c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f3d814e327d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f3d814e31b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f3d7fee7989 - script::dom::workerglobalscope::WorkerGlobalScope::script_chan::h237e31761efa000a
  │   10:     0x7f3d7fdae806 - script::dom::globalscope::GlobalScope::networking_task_source::h8eeaf6db8461abd0
  │   11:     0x7f3d7fef5640 - script::fetch::Fetch::h8a07e180699336ca
  │   12:     0x7f3d7fb1eda3 - std::panicking::try::do_call::ha8ecc4031866dd4d
  │   13:     0x7f3d814bcdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   14:     0x7f3d801f3cab - script::dom::bindings::codegen::Bindings::WorkerGlobalScopeBinding::WorkerGlobalScopeBinding::fetch::h85e4ed58deb70bd9
  │   15:     0x7f3d8021cbb4 - CallJitMethodOp
  │   16:     0x7f3d7fcf1d34 - script::dom::bindings::utils::generic_call::h3881052955259884
  │   17:     0x7f3d805788c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   18:     0x7f3d8056b23e - CallFromStack
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:504
  │                          - Interpret
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:2873
  │   19:     0x7f3d8057848b - 2js9RunScriptEP9JSContextRNS_8RunState
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:399
  │   20:     0x7f3d80578668 - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:471
  │   21:     0x7f3d80578a74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  │   22:     0x7f3d8065a7bf - 2js18PromiseReactionJobEP9JSContextjPN2JS5Value
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/builtin/Promise.cpp:479
  │   23:     0x7f3d805788c0 - CallJSNative
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jscntxtinlines.h:232
  │                          - 2js23InternalCallOrConstructEP9JSContextRKN2JS8CallArgsENS_14MaybeConstruct
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:453
  │   24:     0x7f3d80578a74 - 2js4CallEP9JSContextN2JS6HandleINS2_5ValueEEES5_RKNS_13AnyInvokeArgsENS2_13MutableHandleIS4_E
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/vm/Interpreter.cpp:517
  ��   25:     0x7f3d8040f160 - _Z20JS_CallFunctionValueP9JSContextN2JS6HandleIP8JSObjectEENS2_INS1_5ValueEEERKNS1_16HandleValueArrayENS1_13MutableHandleIS6_EE
  │                         at /home/servo/.cargo/git/checkouts/mozjs-fa11ffc7d4f1cc2d/7cd72d8/mozjs/js/src/jsapi.cpp:2781
  │   26:     0x7f3d8011a6bf - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call::h73a3e35321764eab
  │   27:     0x7f3d8011a37f - script::dom::bindings::codegen::Bindings::PromiseBinding::PromiseJobCallback::Call_::h6a636b71f64a54d5
  │   28:     0x7f3d7ff0231f - script::microtask::MicrotaskQueue::checkpoint::h5f43e839c25e44f1
  │   29:     0x7f3d7fd4d576 - script::dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope::run_worker_scope::{{closure}}::{{closure}}::ha2a27a63451cb059
  │   30:     0x7f3d7fab1453 - std::panicking::try::do_call::h681cf90a3dcfd59f
  │   31:     0x7f3d814bcdca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   32:     0x7f3d7fc0cee7 - <F as alloc::boxed::FnBox<A>>::call_box::hae4f14c8b34be311
  │   33:     0x7f3d814b4b14 - alloc::boxed::{{impl}}::call_once<(),()>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
  │                          - std::sys_common::thread::start_thread
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
  │                          - std::sys::imp::thread::{{impl}}::new::thread_start
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  │   34:     0x7f3d7d4ed183 - start_thread
  │   35:     0x7f3d7d00437c - clone
  │   36:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!

  ▶ CRASH [expected OK] /_mozilla/mozilla/service-workers/service-worker-registration.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Option::unwrap()` on a `None` value (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(1) }, at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/option.rs:323)
  │ stack backtrace:
  │    0:     0x7f86116973dd - backtrace::backtrace::trace::h3daaf829744ddab9
  │    1:     0x7f8611697ad2 - backtrace::capture::Backtrace::new::hd6fb6e83f9059b0d
  │    2:     0x7f860fe7c707 - servo::main::{{closure}}::h2a03f49e668fc733
  │    3:     0x7f8611d10e88 - std::panicking::rust_panic_with_hook
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:556
  │    4:     0x7f8611d10d54 - std::panicking::begin_panic<collections::string::String>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:517
  │    5:     0x7f8611d10c79 - std::panicking::begin_panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:501
  │    6:     0x7f8611d10c07 - std::panicking::rust_begin_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:477
  │    7:     0x7f8611d3e27d - core::panicking::panic_fmt
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:69
  │    8:     0x7f8611d3e1b4 - core::panicking::panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libcore/panicking.rs:49
  │    9:     0x7f861079b380 - script::script_thread::ScriptThread::dispatch_job_queue::h76d1adbc931f7dda
  │   10:     0x7f8610764d55 - <script::script_thread::CancellableRunnable<T> as script::script_thread::Runnable>::main_thread_handler::h592a56c7157909d4
  │   11:     0x7f86107834b0 - script::script_thread::ScriptThread::handle_msg_from_script::h53cc42232f8bf74d
  │   12:     0x7f861077bd1f - script::script_thread::ScriptThread::handle_msgs::{{closure}}::h37795b56198c53ba
  │   13:     0x7f8610776958 - script::script_thread::ScriptThread::handle_msgs::h800a3769f8c72743
  │   14:     0x7f8610381477 - std::panicking::try::do_call::haf4224c234770cf5
  │   15:     0x7f8611d17dca - panic_unwind::__rust_maybe_catch_panic
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  │   16:     0x7f8610467cf7 - <F as alloc::boxed::FnBox<A>>::call_box::h98f09f1f9b6a3dbb
  │   17:     0x7f8611d0fb14 - alloc::boxed::{{impl}}::call_once<(),()>
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:615
  │                          - std::sys_common::thread::start_thread
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
  │                          - std::sys::imp::thread::{{impl}}::new::thread_start
  │                         at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  │   18:     0x7f860dd48183 - start_thread
  │   19:     0x7f860d85f37c - clone
  │   20:                0x0 - <unknown>
  │ ERROR:servo: called `Option::unwrap()` on a `None` value
  └ Pipeline failed in hard-fail mode.  Crashing!
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bors-servo commented Jan 27, 2017

☔️ The latest upstream changes (presumably #15242) made this pull request unmergeable. Please resolve the merge conflicts.

@jdm jdm force-pushed the jdm:microtasks branch from 4cb430b to fe488f3 Feb 1, 2017
@jdm jdm force-pushed the jdm:microtasks branch from fe488f3 to 60d1717 Feb 1, 2017
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jdm commented Feb 1, 2017

@creativcoder You may be interested in the changes I made to the ServiceWorker job queue implementation.

@jdm jdm removed the S-needs-rebase label Feb 1, 2017
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jdm commented Feb 1, 2017

Review comments addressed. All tests pass now.

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creativcoder commented Feb 2, 2017

@jdm Thanks for notifying. :) I went through it. I'm currently working on remaining part of the Update algorithm, to fetch a service worker script and update it and the rest. Guess, they will be needing changes accordingly.

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nox commented Feb 3, 2017

@jdm You said you don't want to put links on GlobalScope methods, which I can understand, but in the end none of the perform_a_microtask_checkpoint methods have a spec link in your PR.

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jdm commented Feb 3, 2017

Because they both delegate to a single method that has the link instead. Adding the link to places like that feels confusing to me.

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nox commented Feb 3, 2017

Fair enough.

@bors-servo r+

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bors-servo commented Feb 3, 2017

📌 Commit 60d1717 has been approved by nox

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bors-servo commented Feb 3, 2017

⌛️ Testing commit 60d1717 with merge cbcafd1...

bors-servo added a commit that referenced this pull request Feb 3, 2017
Implement microtask checkpoints

This generalizes the work previously done for Promise job callbacks. There is now a microtask queue that correctly processes all queued microtasks after each turn of the event loop, as well as after a scripted callback finishes executing, and after a classic script executes.

---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #4283
- [X] There are tests for these changes

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---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15189)
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bors-servo commented Feb 3, 2017

@bors-servo bors-servo merged commit 60d1717 into servo:master Feb 3, 2017
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