$ ./simplebrowser --single-process --disable-gpu
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-stampho'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-stampho'
[24855:24855:0321/112549.896394:ERROR:gpu_process_transport_factory.cc(1019)] Lost UI shared context.
[24855:24883:0321/112549.960565:WARNING:histograms.cc(40)] Started multiple compositor clients (Browser, Renderer) in one process. Some metrics will be disabled.
[24855:24880:0321/112549.990853:ERROR:gl_surface_qt.cpp(760)] Requested OpenGL implementation is not supported. Implementation: 0
ASSERT failure in Q_UNREACHABLE(): "Q_UNREACHABLE was reached", file /home/stampho/work/Qt/qt5-511-src/qtwebengine/src/core/gl_surface_qt.cpp, line 761
Received signal 6
#0 0x7f4182ae6324 base::debug::StackTrace::StackTrace()
#1 0x7f4182ae41cd base::debug::StackTrace::StackTrace()
#2 0x7f4182ae4d98 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#3 0x7f417b58bec0 <unknown>
#4 0x7f417ac90ef0 gsignal
#5 0x7f417ac92a47 abort
#6 0x7f417b8a9e4e qt_message_fatal()
#7 0x7f417b8aaad1 QMessageLogger::fatal()
#8 0x7f417b8a4b64 qt_assert_x()
#9 0x7f417e69295f gl::init::CreateOffscreenGLSurfaceWithFormat()
#10 0x7f41847560ac gl::init::CreateOffscreenGLSurface()
#11 0x7f4188273c15 gpu::GpuChannelManager::GetDefaultOffscreenSurface()
#12 0x7f4188282e7a gpu::GLES2CommandBufferStub::Initialize()
#13 0x7f418825bb85 gpu::GpuChannel::OnCreateCommandBuffer()
#14 0x7f418826708a _ZN4base20DispatchToMethodImplIPN3gpu10GpuChannelEMS2_FvRK28GPUCreateCommandBufferConfigiNS_18SharedMemoryHandleEPNS1_13ContextResultEPNS1_12CapabilitiesEESt5tuple
IJS4_iS7_EESE_IJS8_SA_EEJLm0ELm1ELm2EEJLm0ELm1EEEEvRKT_T0_OT1_PT2_St16integer_sequenceImJXspT3_EEESP_ImJXspT4_EEE
#15 0x7f418826314f _ZN4base16DispatchToMethodIPN3gpu10GpuChannelEMS2_FvRK28GPUCreateCommandBufferConfigiNS_18SharedMemoryHandleEPNS1_13ContextResultEPNS1_12CapabilitiesEESt5tupleIJS4
_iS7_EESE_IJS8_SA_EEEEvRKT_T0_OT1_PT2_
#16 0x7f418825f86f _ZN3IPC8MessageTI38GpuChannelMsg_CreateCommandBuffer_MetaSt5tupleIJ28GPUCreateCommandBufferConfigiN4base18SharedMemoryHandleEEES2_IJN3gpu13ContextResultENS7_12Capa
bilitiesEEEE8DispatchINS7_10GpuChannelESD_vMSD_FvRKS3_iS5_PS8_PS9_EEEbPKNS_7MessageEPT_PT0_PT1_T2_
#17 0x7f418825adc6 gpu::GpuChannel::OnControlMessageReceived()
#18 0x7f418825b25d gpu::GpuChannel::HandleMessageHelper()
#19 0x7f418825b351 gpu::GpuChannel::HandleOutOfOrderMessage()
#20 0x7f418826e7a7 _ZN4base8internal13FunctorTraitsIMN3gpu10GpuChannelEFvRKN3IPC7MessageEEvE6InvokeIRKNS_7WeakPtrIS3_EEJS7_EEEvS9_OT_DpOT0_
#21 0x7f418826c5cb _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIRKMN3gpu10GpuChannelEFvRKN3IPC7MessageEERKNS_7WeakPtrIS5_EEJS9_EEEvOT_OT0_DpOT1_
#22 0x7f4188269813 _ZN4base8internal7InvokerINS0_9BindStateIMN3gpu10GpuChannelEFvRKN3IPC7MessageEEJNS_7WeakPtrIS4_EES6_EEEFvvEE7RunImplIRKSA_RKSt5tupleIJSC_S6_EEJLm0ELm1EEEEvOT_OT0_St16integer_sequenceImJXspT1_EEE
#23 0x7f4188265fee _ZN4base8internal7InvokerINS0_9BindStateIMN3gpu10GpuChannelEFvRKN3IPC7MessageEEJNS_7WeakPtrIS4_EES6_EEEFvvEE3RunEPNS0_13BindStateBaseE
#24 0x7f417e73fdf2 _ZNO4base12OnceCallbackIFvvEE3RunEv
#25 0x7f4182ae69cb base::debug::TaskAnnotator::RunTask()
#26 0x7f4182b553d0 base::internal::IncomingTaskQueue::RunTask()
#27 0x7f4182b596c6 base::MessageLoop::RunTask()
#28 0x7f4182b5984c base::MessageLoop::DeferOrRunPendingTask()
#29 0x7f4182b59b7b base::MessageLoop::DoWork()
#30 0x7f4182b5a66f base::MessagePumpDefault::Run()
#31 0x7f4182b58e8c base::MessageLoop::Run()
#32 0x7f4182beffc0 base::RunLoop::Run()
#33 0x7f4182ca40cd base::Thread::Run()
#34 0x7f4182ca48ec base::Thread::ThreadMain()
#35 0x7f4182c9890f base::(anonymous namespace)::ThreadFunc()
#36 0x7f417b57f68a <unknown>
#37 0x7f417ad5d6bf clone
  r8: 0000000000000000  r9: 00007f410e7f9970 r10: 0000000000000008 r11: 0000000000000246
 r12: 00007f410e7f9d68 r13: 0000000000000000 r14: 00007f410e7f9fa8 r15: 00007f40ec0095c8
  di: 0000000000000002  si: 00007f410e7f9970  bp: 00007f410e7f9bd8  bx: 0000000000000006
  dx: 0000000000000000  ax: 0000000000000000  cx: 00007f417ac90ef0  sp: 00007f410e7f9970
  ip: 00007f417ac90ef0 efl: 0000000000000246 cgf: 002b000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.