Intermittent CRASH [expected OK] /webgl/conformance-1.0.3/conformance/limits/gl-min-attribs.html

[mbrubeck]

First seen in #10643. CC #10373.

  ▶ CRASH [expected OK] /webgl/conformance-1.0.3/conformance/limits/gl-min-attribs.html
  │ 
  │ DESCRIPTION: WebGL the minimum number of attributes are supported.
  │ PASS getError was expected value: NO_ERROR : Should be no errors from setup.
  │ ERROR:js::rust: Error at http://web-platform.test:8000/webgl/conformance-1.0.3/conformance/resources/webgl-test-utils.js:1034:4: gl.readPixels is not a function
  │ 
  │ FAIL successfullyParsed should be true (of type boolean). Was undefined (of type undefined).
  │ TEST COMPLETE
  │ thread 'PaintWorker' panicked at 'assertion failed: (data.len() as i32) >= stride * size.height', /Users/servo/.cargo/git/checkouts/rust-azure-97bcec2370a94878/master/src/azure_hl.rs:710
  │ stack backtrace:
  │    1:        0x1086d6388 - std::sys::backtrace::tracing::imp::write::h714760a4c8c0cdd8
  │    2:        0x1086dc665 - std::panicking::default_hook::_$u7b$$u7b$closure$u7d$$u7d$::hff309ab1d83ffd90
  │    3:        0x1086dc27e - std::panicking::default_hook::h08ad3bb09872855b
  │    4:        0x107d4d9af - util::panicking::initiate_panic_hook::_$u7b$$u7b$closure$u7d$$u7d$::_$u7b$$u7b$closure$u7d$$u7d$::h0bad41b0b38a855d
  │    5:        0x1086c4058 - std::sys_common::unwind::begin_unwind_inner::h406d5f1a330b854b
  │    6:        0x107865194 - std::sys_common::unwind::begin_unwind::h51df842978a11a26
  │    7:        0x10837e7b2 - azure::azure_hl::DrawTarget::create_source_surface_from_data::h49115d192ea3a103
  │    8:        0x10791fff5 - gfx::paint_context::PaintContext::draw_image::h8ef92595212eed84
  │    9:        0x107931cc2 - gfx::display_list::DisplayItem::draw_into_context::h4ecad61f8b46d0f9
  │   10:        0x107931b24 - gfx::display_list::DisplayList::draw_item_at_index_into_context::h01f175b31365b324
  │   11:        0x107948fd9 - gfx::paint_thread::WorkerThread::main::h768ba2c99b634f72
  │   12:        0x107946cfb - std::sys_common::unwind::try::try_fn::hb697826281a0992b
  │   13:        0x1086d55eb - __rust_try
  │   14:        0x1086d5573 - std::sys_common::unwind::inner_try::h4e97625a08807651
  │   15:        0x10794747f - _<F as alloc..boxed..FnBox<A>>::call_box::hf01593981b31feb0
  │   16:        0x1086db6e8 - std::sys::thread::Thread::new::thread_start::h74af400293164137
  │   17:     0x7fff86bcf059 - _pthread_body
  │   18:     0x7fff86bcefd6 - _pthread_start
  │ Thread "PaintThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(0) }" panicked with an unwrap of `RecvError` (backtrace skipped)
  └ Pipeline failed in hard-fail mode.  Crashing!

[jdm]

#10727