Intermittent Option::unwrap() panic in /dom/nodes/Document-createElement-namespace.html #7731
Description
3:35.82 TEST_START: Thread-TestrunnerManager-1 /dom/nodes/Document-createElement-namespace.html
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) Full command: /Users/servo/buildbot/slave/mac-rel-wpt/build/target/release/servo --cpu --hard-fail -u Servo/wptrunner -z http://localhost:8000/dom/nodes/Document-createElement-namespace.html --user-stylesheet /Users/servo/buildbot/slave/mac-rel-wpt/build/resources/ahem.css
(pid:13632) "thread 'ScriptTask PipelineId(0)' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:365"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) "stack backtrace:"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 1: 0x108b107b0 - sys::backtrace::tracing::imp::write::h88885f5c2d394b3flbt"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 2: 0x108b0f913 - panicking::on_panic::h7a7974779bbfef81TZw"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 3: 0x108b000e2 - sys_common::unwind::begin_unwind_inner::h879cfd5a30161a9evas"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 4: 0x108b0060e - sys_common::unwind::begin_unwind_fmt::h86e9e878cb969fb5B9r"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 5: 0x108b0f197 - rust_begin_unwind"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 6: 0x108b351a0 - panicking::panic_fmt::h74e66b6fcc9eaf3cwZK"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 7: 0x108b30d2c - panicking::panic::he6e1bfb72056e4793XK"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 8: 0x107b69e41 - dom::window::Window::get_cx::h0ca1665a8f918635Irh"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 9: 0x107df1173 - dom::event::Event::new_uninitialized::h01057e8259df5c71eJS"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 10: 0x107dda968 - dom::event::Event::new::h452f23c3aa82337buJS"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 11: 0x107e62341 - dom::htmlimageelement::ImageResponseHandlerRunnable.Runnable::handler::h6a9e726ff89f4fef49Y"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 12: 0x107f55df3 - script_task::ScriptTask::handle_msg_from_script::h92612835436a05f5xen"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 13: 0x107f719a8 - script_task::ScriptTask::handle_msgs::closure.151864"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 14: 0x107f5f162 - script_task::ScriptTask::handle_msgs::hfc1dfd86d8826f59tZm"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 15: 0x107f4b567 - boxed::F.FnBox<A>::call_box::h13207957566832505401"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 16: 0x107b23832 - sys_common::unwind::try::try_fn::h2178713618348901180"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 17: 0x108b0efd8 - __rust_try"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 18: 0x108b0c3a0 - sys_common::unwind::try::inner_try::h30a7e5c7446717a0T6r"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 19: 0x107b239d7 - boxed::F.FnBox<A>::call_box::h14260401093029468028"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 20: 0x108b1147d - sys::thread::Thread::new::thread_start::h6e92c6728040a269Mxw"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 21: 0x7fff8cbf6267 - _pthread_body"
3:36.31 PROCESS_OUTPUT: Thread-TestrunnerManager-1 (pid:13632) " 22: 0x7fff8cbf61e4 - _pthread_start"
3:50.85 TEST_END: Thread-TestrunnerManager-1 TIMEOUT, expected OK
This comes from Window::get_cx:
231 pub fn get_cx(&self) -> *mut JSContext {
232 self.js_runtime.borrow().as_ref().unwrap().cx()
233 }
We have an image load notification occurring which is trying to dispatch a DOM event after we've already torn down the JS runtime (or haven't created it, but that seems unlikely).