Intermittent crash in /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html

[jdm]

  ▶ CRASH [expected OK] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html
  │ 
  │ VMware, Inc.
  │ softpipe
  │ 3.3 (Core Profile) Mesa 18.3.0-devel
  │ Layout thread disconnected.: "SendError(..)" (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(1) }, at src/libcore/result.rs:999)
  │ stack backtrace:
  │    0:     0x7fdcc060940d - backtrace::backtrace::trace::h79f1388f62af1802
  │    1:     0x7fdcc06084f2 - backtrace::capture::Backtrace::new::hc3bba4c59ac369f9
  │    2:     0x7fdcbe0ec707 - servo::main::{{closure}}::hf19b374ab533c127
  │    3:     0x7fdcc12e3169 - std::panicking::rust_panic_with_hook::h4ae0c8352236ab41
  │                         at src/libstd/panicking.rs:482
  │    4:     0x7fdcc12e2c11 - std::panicking::continue_panic_fmt::h3111c2662a27401f
  │                         at src/libstd/panicking.rs:385
  │    5:     0x7fdcc12e2af5 - rust_begin_unwind
  │                         at src/libstd/panicking.rs:312
  │    6:     0x7fdcc130288c - core::panicking::panic_fmt::h9b22f2eab14691b2
  │                         at src/libcore/panicking.rs:85
  │    7:     0x7fdcbecab549 - core::result::unwrap_failed::hd73a15296c74d9b9
  │    8:     0x7fdcbe6cd5d4 - script::dom::window::Window::force_reflow::h53978208f3a3c509
  │    9:     0x7fdcbe6cdd70 - script::dom::window::Window::reflow::heddd495561cc9402
  │   10:     0x7fdcbe9d0667 - script::dom::document::Document::finish_load::h6d5c5438ae1a0bd3
  │   11:     0x7fdcbe762a8f - script::dom::servoparser::ServoParser::do_parse_sync::h5fa2c01154ba2fd0
  │   12:     0x7fdcbeae5652 - profile_traits::time::profile::h77044da60d2c5250
  │   13:     0x7fdcbe762130 - _ZN6script3dom11servoparser11ServoParser10parse_sync17ha4fd06fc285ee4c9E.llvm.9339690625470186472
  │   14:     0x7fdcbe76829f - <script::dom::servoparser::ParserContext as net_traits::FetchResponseListener>::process_response_eof::h2d88f23e27a56c4e
  │   15:     0x7fdcbebfed50 - script::script_thread::ScriptThread::handle_msg_from_constellation::h42a0e4ca9312c959
  │   16:     0x7fdcbebf5cd5 - script::script_thread::ScriptThread::handle_msgs::{{closure}}::h50dd6c3e534ef2de
  │   17:     0x7fdcbebf21d0 - _ZN6script13script_thread12ScriptThread11handle_msgs17h470952e4622057d7E.llvm.16015583961693140166
  │   18:     0x7fdcbebedb16 - script::script_thread::ScriptThread::start::h15ea86fa7a7fa212
  │   19:     0x7fdcbec7e92e - profile_traits::mem::ProfilerChan::run_with_memory_reporting::hca3d66b9290e91c7
  │   20:     0x7fdcbed77ee4 - std::sys_common::backtrace::__rust_begin_short_backtrace::h8489019698b0aeef
  │   21:     0x7fdcbf2c41c5 - _ZN3std9panicking3try7do_call17h352587cb1a98b0eeE.llvm.18296174844099702026
  │   22:     0x7fdcc12ede79 - __rust_maybe_catch_panic
  │                         at src/libpanic_unwind/lib.rs:92
  │   23:     0x7fdcbeef8387 - <F as alloc::boxed::FnBox<A>>::call_box::hbb3f60dda289794c
  │   24:     0x7fdcc12ed22d - <alloc::boxed::Box<(dyn alloc::boxed::FnBox<A, Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$RP$$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::h6f2a2148ffb0bc67
  │                         at /rustc/fb86d604bf65c3becd16180b56267a329cf268d5/src/liballoc/boxed.rs:734
  │                          - std::sys_common::thread::start_thread::h484e653ee0a7a7a3
  │                         at src/libstd/sys_common/thread.rs:14
  │                          - std::sys::unix::thread::Thread::new::thread_start::h9d911af69d8eb4e6
  │                         at src/libstd/sys/unix/thread.rs:81
  │   25:     0x7fdcbbd38183 - start_thread
  │   26:     0x7fdcba5ff03c - clone
  │   27:                0x0 - <unknown>
  │ [2018-12-28T15:09:39Z ERROR servo] Layout thread disconnected.: "SendError(..)"
  └ Pipeline failed in hard-fail mode.  Crashing!