Intermittent crash in osmesa

[jdm]

  ▶ TIMEOUT [expected PASS] /css/CSS2/css1/c13-inheritance-000.xht
  │ 
  │ VMware, Inc.
  │ softpipe
  │ 3.3 (Core Profile) Mesa 18.1.0-devel
  │ Shutting down the Constellation after generating an output file or exit flag specified
  │ VMware, Inc.
  │ softpipe
  │ 3.3 (Core Profile) Mesa 18.1.0-devel
  │ 2018-06-07 15:19:50.165 servo[23428:15653269] Metadata.framework [Error]: couldn't get the client port
  │ Stack trace for thread "main"
  │ stack backtrace:
  │    0:        0x10cd627de - backtrace::backtrace::trace::h0217a35a27c6669c
  │    1:        0x10cd632bc - _$LT$backtrace..capture..Backtrace$u20$as$u20$core..default..Default$GT$::default::he8a822a2cccc31d4
  │    2:        0x10cd6330d - backtrace::capture::Backtrace::new::hc727cc4a6b9e93b8
  │    3:        0x10a61a7f6 - servo::install_crash_handler::handler::h659fed9db2892d3a
  │    4:     0x7fff9002a529 - _sigtramp
  │    5:        0x11033d560 - unsafe_free
  │                         at /Users/servo/.cargo/git/checkouts/osmesa-src-bf84ce2b80210dd7/25825d4/mesa-src/src/util/ralloc.c:268
  │    6:        0x11033d56c - unsafe_free
  │                         at /Users/servo/.cargo/git/checkouts/osmesa-src-bf84ce2b80210dd7/25825d4/mesa-src/src/util/ralloc.c:269
  │    7:        0x110353d92 - link_shaders(gl_context*, gl_shader_program*)
  │                         at /Users/servo/.cargo/git/checkouts/osmesa-src-bf84ce2b80210dd7/25825d4/mesa-src/src/compiler/glsl/linker.cpp:5155
  │    8:        0x1102629f7 - _mesa_glsl_link_shader
  │                         at /Users/servo/.cargo/git/checkouts/osmesa-src-bf84ce2b80210dd7/25825d4/mesa-src/src/mesa/program/ir_to_mesa.cpp:3159
  │    9:        0x110173579 - link_program_error
  │                         at /Users/servo/.cargo/git/checkouts/osmesa-src-bf84ce2b80210dd7/25825d4/mesa-src/src/mesa/main/shaderapi.c:1204
  │   10:        0x10c07bdbb - webrender::device::Device::create_program::heabed15b532bd7d1
  │   11:        0x10bfd2f18 - webrender::shade::create_prim_shader::h45efd2dc4b4f651b
  │   12:        0x10bfd1890 - webrender::shade::LazilyCompiledShader::get::hc8693cce817e9b06 (.llvm.9052033286959810327)
  │   13:        0x10bfd1231 - webrender::shade::LazilyCompiledShader::bind::h88540f03b1be7268
  │   14:        0x10bfae0cc - webrender::renderer::Renderer::draw_color_target::h4ac63ebd27091232
  │   15:        0x10bfb294d - webrender::renderer::Renderer::draw_tile_frame::h73f8bdad4650d244
  │   16:        0x10c09efa2 - webrender::profiler::TimeProfileCounter::profile::h672d7472d7409754
  │   17:        0x10bfa917b - webrender::renderer::Renderer::render_impl::hc4185782e6bca904
  │   18:        0x10bfa8caf - webrender::renderer::Renderer::render::h626324d876632a75
  │   19:        0x10a605df0 - profile_traits::time::profile::h51844bb125815f10
  │   20:        0x10a64fd6a - _$LT$compositing..compositor..IOCompositor$LT$Window$GT$$GT$::composite_specific_target::h106e21e618c41e7e (.llvm.15710307962696917527)
  │   21:        0x10a65256e - _$LT$compositing..compositor..IOCompositor$LT$Window$GT$$GT$::composite::h1142b8336e883f8d
  │   22:        0x10a64a9e5 - _$LT$compositing..compositor..IOCompositor$LT$Window$GT$$GT$::perform_updates::hd84260dec83cb694
  │   23:        0x10a613c8c - _$LT$servo..Servo$LT$Window$GT$$GT$::handle_events::h3269f974c27eb9c0
  │   24:        0x10a638423 - servo::main::_$u7b$$u7b$closure$u7d$$u7d$::h6b8296468c3e888a
  │   25:        0x10a6347ac - servo::glutin_app::window::Window::run::hf809ace957567e16
  │   26:        0x10a61bc88 - servo::main::heda386a18cc455bf
  │   27:        0x10a63ba05 - std::rt::lang_start::_$u7b$$u7b$closure$u7d$$u7d$::hbc26d83cb28f17e9
  │   28:        0x10cd71eb7 - std::panicking::try::do_call::hf4440144bf9f9053 (.llvm.16473306441498974555)
  │   29:        0x10cd949be - __rust_maybe_catch_panic
  │   30:        0x10cd79e21 - std::rt::lang_start_internal::hbe9b12d23892d52d
  │   31:        0x10a61cd0b - main

[SimonSapin]

OSMesa is no longer used since #25853, is this still relevant?