Intermittent crash ("failed to fill whole buffer") in /navigation-timing/nav2_test_open_data_uri.html, /html/browsers/browsing-the-web/navigating-across-documents/javascript-url-query-fragment-components.html, and /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html, /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html

[jdm]

  ▶ CRASH [expected OK] /cors/remote-origin.htm
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: UnexpectedEof, error: StringError("failed to fill whole buffer") }) } (thread <unnamed>, at ../src/libcore/result.rs:837)
  │ stack backtrace:
  │    0:        0x109897d8e - backtrace::backtrace::trace::h16372ee7bf1517e5
  │    1:        0x10989807c - backtrace::capture::Backtrace::new::hcc43c50c4b11c693
  │    2:        0x109554034 - servo::main::_{{closure}}::he01100fc53982b46
  │    3:        0x10af5fbd3 - std::panicking::rust_panic_with_hook::h00b81bb3dcbd51f2
  │    4:        0x10af5faa4 - std::panicking::begin_panic::ha6a0d553db9869ff
  │    5:        0x10af5f9c2 - std::panicking::begin_panic_fmt::h24d113aee3ee4081
  │    6:        0x10af5f927 - rust_begin_unwind
  │    7:        0x10af8c6f0 - core::panicking::panic_fmt::he441b2ea2036b98a
  │    8:        0x1098fc530 - core::result::unwrap_failed::h88381ff2d9927dee
  │    9:        0x1099310b6 - webrender::render_backend::RenderBackend::run::h5a5f7231522053b6
  │   10:        0x1098f62f3 - std::panicking::try::do_call::h32ae11f1292d9ad8
  │   11:        0x10af60bfa - __rust_maybe_catch_panic
  │   12:        0x109901c66 - _<F as alloc..boxed..FnBox<A>>::call_box::h8df20a89dddfedaa
  │   13:        0x10af5ea84 - std::sys::thread::Thread::new::thread_start::h9fa66f6812e81e10
  │   14:     0x7fff97f2c059 - _pthread_body
  │   15:     0x7fff97f2bfd6 - _pthread_start
  │ ERROR:servo: called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: UnexpectedEof, error: StringError("failed to fill whole buffer") }) }
  │ called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: NotFound, error: StringError("Bogus destination port.") }) } (thread main, at ../src/libcore/result.rs:837)
  └ Pipeline failed in hard-fail mode.  Crashing!

[jdm]

In theory this has been fixed. Only one way to find out!