How did you identify that CL? Does it work if you revert it locally?

I'm about to try it... but it is taking too long to build. I have come to that CL because both targets emit logs saying: 

[2196:5680:0115/213617.130:ERROR:broker_host.cc(58)] Failed to rewrite one or more handles to broker client.

This log is emitted multiple times, so clearly something is going on here. That CL is introduced these buffers for embedded but I'm not sure if it worked properly ever. Also, this thing has been broken for at least 5 months.

Right, content shell certainly hasn't been broken for that long on Windows.

Let me copy/paste the log from the e-mail you sent:

  [2196:5680:0115/213617.130:ERROR:broker_host.cc(58)] Failed to rewrite one or more handles to broker client.
  DevTools listening on ws://127.0.0.1:1996/devtools/browser/256f34bc-cdfb-4dc7-9531-cef793586c41
  [2196:5680:0115/213617.723:ERROR:gpu_process_host.cc(374)] !GpuDataManagerImpl::GpuAccessAllowed()
  [2196:5680:0115/213617.723:ERROR:browser_gpu_channel_host_factory.cc(120)] Failed to launch GPU process.
  [2196:5680:0115/213617.925:ERROR:gpu_process_host.cc(374)] !GpuDataManagerImpl::GpuAccessAllowed()
  [2196:6572:0115/213618.284:ERROR:gpu_process_transport_factory.cc(1019)] Lost UI shared context.
  [2196:5680:0115/213618.347:ERROR:service_manager_context.cc(236)] Attempting to run unsupported native service: Y:\dev\chromium\src\out\Debug\content_renderer.service.exe
  [2196:5680:0115/213619.007:ERROR:gpu_process_host.cc(374)] !GpuDataManagerImpl::GpuAccessAllowed()
  [2196:5680:0115/213619.039:ERROR:broker_host.cc(58)] Failed to rewrite one or more handles to broker client.

I think a useful practice would be to understand whether it's rendering being broken, or just painting. Could you load a page from a (local) server in content shell, and then verify in the server's logs whether it received the request, and ideally a sub-resource on the page? E.g. an image.

I have tried to load a WebUI page on views_examples_with_content_exe and it failed in the same way. I think that the problem is rendering by what I've seen so far.

OK. I have no idea how to help you debug that.

Could you save the output of chrome://gpu/ (the page tells you how) in regular Chrome and share that on here? Maybe +kbr can triage further based on that.

Don't worry, I'm about to build it... Taking a bit too long. I'll be providing some feedback around here. With regards content_shell, when I run it on Mac, it start at file:///, and shows the local files, so I don't think it is a matter of not reaching the server.

Thanks Peter. I'll be providing further updates soon.

That change is pretty ancient by now and it should not break anything. content_shell is clearly not broken on Windows in general as that would be catastrophic for many reasons. You have no local changes?

Also, if you revert that CL you will break a bunch of random stuff.

I have no local changes. If you compile content_shell on Windows and run it, you will notice that only a blank page is shown on the screen. At the same time, you do have a point about the unit tests passing, so clearly this rendering problem is not hindering the execution of those tests.

Can any Chromium teammate confirm that content_shell is working for them on Windows?

Maybe there was a recent GPU blacklist change. Submitter, if you can provide about:gpu from Chrome Canary on your system that will help.

If reporter can just open Chrome Canary on the same machine and make sure it's the latest version, and report back about:gpu content (content_shell should share the same blacklist decisions), then we will understand why GPU process is disabled on your machine.

I assume we don't have SwiftShader for content_shell? We might have a bug falling back to no gpu_process on Windows with content_shell.

Alright, sorry for the delay: Here's the GPU report from Canary.


Graphics Feature Status
Canvas: Hardware accelerated
CheckerImaging: Enabled
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Rasterization: Unavailable
Video Decode: Hardware accelerated
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
decode_encode_srgb_for_generatemipmap
disable_accelerated_vpx_decode
disable_direct_composition
disable_discard_framebuffer
disable_dxgi_zero_copy_video
disable_framebuffer_cmaa
exit_on_context_lost
force_cube_complete
scalarize_vec_and_mat_constructor_args
texsubimage_faster_than_teximage
Problems Detected
GPU rasterization should only be enabled on NVIDIA and Intel DX11+, and AMD RX-R2 GPUs for now.: 643850
Disabled Features: gpu_rasterization
Some drivers are unable to reset the D3D device in the GPU process sandbox
Applied Workarounds: exit_on_context_lost
TexSubImage is faster for full uploads on ANGLE
Applied Workarounds: texsubimage_faster_than_teximage
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
ANGLE crash on glReadPixels from incomplete cube map texture: 518889
Applied Workarounds: force_cube_complete
Framebuffer discarding can hurt performance on non-tilers: 570897
Applied Workarounds: disable_discard_framebuffer
Direct composition flashes black initially on Win <10: 588588
Applied Workarounds: disable_direct_composition
Zero copy DXGI video hangs on shutdown on Win < 8.1: 621190
Applied Workarounds: disable_dxgi_zero_copy_video
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent)
Decode and Encode before generateMipmap for srgb format textures on Windows: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
VPx decoding isn't supported well before Windows 10 creators update.: 616318, 667532
Applied Workarounds: disable_accelerated_vpx_decode
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers
Version Information
Data exported	2018-01-22T19:38:30.554Z
Chrome version	Chrome/66.0.3328.0
Operating system	Windows NT 6.1.7601 SP1
Software rendering list URL	https://chromium.googlesource.com/chromium/src/+/1629a284e7c7c2ea5e562d9f242a84992cab5ed7/gpu/config/software_rendering_list.json
Driver bug list URL	https://chromium.googlesource.com/chromium/src/+/1629a284e7c7c2ea5e562d9f242a84992cab5ed7/gpu/config/gpu_driver_bug_list.json
ANGLE commit id	3c424b489c25
2D graphics backend	Skia/66 e168c3e8f9a13472983a567ecd679226c9d0d186-
Command Line	"C:\Users\claudiodesouza\AppData\Local\Google\Chrome SxS\Application\chrome.exe" --flag-switches-begin --flag-switches-end
Driver Information
Initialization time	1340
In-process GPU	false
Passthrough Command Decoder	true
Direct Composition	false
Supports overlays	false
Sandboxed	false
GPU0	VENDOR = 0x1ab8, DEVICE= 0x4005 *ACTIVE*
Optimus	false
Optimus	false
AMD switchable	false
Desktop compositing	Aero Glass
Driver vendor	Parallels
Driver version	13.2.43213.0
Driver date	11-15-2017
Pixel shader version	4.1
Vertex shader version	4.1
Max. MSAA samples	8
Machine model name	
Machine model version	
GL_VENDOR	Google Inc.
GL_RENDERER	ANGLE (Parallels Display Adapter (WDDM) Direct3D11 vs_4_1 ps_4_1)
GL_VERSION	OpenGL ES 2.0 (ANGLE 2.1.0.3c424b489c25)
GL_EXTENSIONS	GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object
Disabled Extensions	GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Window system binding vendor	Google Inc. (adapter LUID: 0000000000006ba4)
Window system binding version	1.4 (ANGLE 2.1.0.3c424b489c25)
Window system binding extensions	EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization
Direct rendering	Yes
Reset notification strategy	0x8252
GPU process crash count	0
Compositor Information
Tile Update Mode	One-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	Software only
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	GPU_READ, SCANOUT
RGBA_8888	GPU_READ, SCANOUT
BGRX_8888	Software only
BGRX_1010102	Software only
BGRA_8888	Software only
RGBA_F16	Software only
YVU_420	Software only
YUV_420_BIPLANAR	Software only
UYVY_422	Software only
Display(s) Information
Info	Display[2528732444] bounds=0,0 1440x900, workarea=0,23 1440x877, scale=1, external
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Info	Display[2779098405] bounds=3360,37 1920x1080, workarea=3360,60 1920x1057, scale=1, external
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Info	Display[2841568472] bounds=1440,0 1920x1080, workarea=1440,23 1920x1011, scale=1, external
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Video Acceleration Information
Decode h264 baseline	up to 1920x1088 pixels
Decode h264 main	up to 1920x1088 pixels
Decode h264 high	up to 1920x1088 pixels
Diagnostics
0
b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
bDDAccelerationEnabled	true
bDriverBeta	true
bDriverDebug	true
bDriverSigned	false
bDriverSignedValid	false
bNoHardware	false
dwBpp	32
dwDDIVersion	10
dwHeight	900
dwRefreshRate	60
dwWHQLLevel	0
dwWidth	1440
iAdapter	0
lDriverSize	156296
lMiniVddSize	0
szAGPStatusEnglish	Enabled
szAGPStatusLocalized	Enabled
szChipType	Virtual Adapter
szD3DStatusEnglish	Enabled
szD3DStatusLocalized	Enabled
szDACType	Integrated RAMDAC
szDDIVersionEnglish	10.1
szDDIVersionLocalized	10.1
szDDStatusEnglish	Enabled
szDDStatusLocalized	Enabled
szDXVAHDEnglish	Not Supported
szDXVAModes	
szDescription	Parallels Display Adapter (WDDM)
szDeviceId	0x4005
szDeviceIdentifier	{D7B71458-0345-11CF-C5D1-0A24A0C2C535}
szDeviceName	\\.\DISPLAY1
szDisplayMemoryEnglish	1024 MB
szDisplayMemoryLocalized	1024 MB
szDisplayModeEnglish	1440 x 900 (32 bit) (60Hz)
szDisplayModeLocalized	1440 x 900 (32 bit) (60Hz)
szDriverAssemblyVersion	13.2.43213.0
szDriverAttributes	Beta Debug
szDriverDateEnglish	11/15/2017 12:40:44
szDriverDateLocalized	15/11/2017 12:40:44
szDriverLanguageEnglish	English
szDriverLanguageLocalized	English
szDriverModelEnglish	WDDM 1.1
szDriverModelLocalized	WDDM 1.1
szDriverName	prl_umdd.dll,prl_umdd10.dll
szDriverNodeStrongName	oem26.inf:Models.NTamd64.6:DDInstall64_6:13.2.43213.0:pci\ven_1ab8&dev_4005&subsys_04001ab8
szDriverSignDate	
szDriverVersion	8.15.0010.43213
szKeyDeviceID	Enum\PCI\VEN_1AB8&DEV_4005&SUBSYS_04001AB8&REV_00
szKeyDeviceKey	\Registry\Machine\System\CurrentControlSet\Control\Video\{F7661406-6CA1-435D-9EF6-1B09F2BFC774}\0000
szManufacturer	Parallels
szMiniVdd	n/a
szMiniVddDateEnglish	n/a
szMiniVddDateLocalized	n/a
szMonitorMaxRes	
szMonitorName	Generic Non-PnP Monitor
szNotesEnglish	No problems found.
szNotesLocalized	No problems found.
szOverlayEnglish	Not Supported
szRankOfInstalledDriver	00E00001
szRegHelpText	
szRevision	
szRevisionId	0x0000
szSubSysId	0x04001AB8
szTestResultD3D7English	Not run
szTestResultD3D7Localized	Not run
szTestResultD3D8English	Not run
szTestResultD3D8Localized	Not run
szTestResultD3D9English	Not run
szTestResultD3D9Localized	Not run
szTestResultDDEnglish	Not run
szTestResultDDLocalized	Not run
szVdd	n/a
szVendorId	0x1AB8
1
b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
bDDAccelerationEnabled	true
bDriverBeta	true
bDriverDebug	true
bDriverSigned	false
bDriverSignedValid	false
bNoHardware	false
dwBpp	32
dwDDIVersion	10
dwHeight	1080
dwRefreshRate	60
dwWHQLLevel	0
dwWidth	1920
iAdapter	1
lDriverSize	156296
lMiniVddSize	0
szAGPStatusEnglish	Enabled
szAGPStatusLocalized	Enabled
szChipType	Virtual Adapter
szD3DStatusEnglish	Enabled
szD3DStatusLocalized	Enabled
szDACType	Integrated RAMDAC
szDDIVersionEnglish	10.1
szDDIVersionLocalized	10.1
szDDStatusEnglish	Enabled
szDDStatusLocalized	Enabled
szDXVAHDEnglish	Not Supported
szDXVAModes	
szDescription	Parallels Display Adapter (WDDM)
szDeviceId	0x4005
szDeviceIdentifier	{D7B71458-0345-11CF-C5D1-0A24A0C2C535}
szDeviceName	\\.\DISPLAY2
szDisplayMemoryEnglish	1024 MB
szDisplayMemoryLocalized	1024 MB
szDisplayModeEnglish	1920 x 1080 (32 bit) (60Hz)
szDisplayModeLocalized	1920 x 1080 (32 bit) (60Hz)
szDriverAssemblyVersion	13.2.43213.0
szDriverAttributes	Beta Debug
szDriverDateEnglish	11/15/2017 12:40:44
szDriverDateLocalized	15/11/2017 12:40:44
szDriverLanguageEnglish	English
szDriverLanguageLocalized	English
szDriverModelEnglish	WDDM 1.1
szDriverModelLocalized	WDDM 1.1
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szDriverNodeStrongName	oem26.inf:Models.NTamd64.6:DDInstall64_6:13.2.43213.0:pci\ven_1ab8&dev_4005&subsys_04001ab8
szDriverSignDate	
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szVdd	n/a
szVendorId	0x1AB8
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b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
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bNoHardware	false
dwBpp	32
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lMiniVddSize	0
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szDXVAModes	
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szVdd	n/a
szVendorId	0x1AB8
Log Messages
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.

That's weird. Nothing is disabled. So I don't understand why content_shell triggers the code path where GPU process fails to launch. As far as I can remember, content_shell and Chrome should not be different in this aspect.

I must say... Three days ago I built chromium and the built version wouldn't load a single page due to GPU errors. I have not been able to build chromium because of a broken v8 jumbo build that has landed over the weekend and is not going away.

For what it's worth, when I build for Windows on ToT, content_shell renders
content just fine.

I'm building in a different computer... It might be that all this time I have been duped by my set up.

I am kicking of a build for content_shell on my windows. I doubt though I could reproduce this.

Reporter, maybe it's beneficial if you could do a clean build (gn clean out\Release) and see if you can still repo the issue on the same machine.

Could  issue 804179  be related?

I have built content_shell in two different computers. On a Win2016 server it built fine. On another Win7 computer I doesn't work. I get the following warnings and a blank page:

DevTools listening on ws://127.0.0.1:1351/devtools/browser/3ff123dd-43eb-42f1-955b-8f8953fec5f8
[3500:2284:0122/222320.383:ERROR:broker_host.cc(58)] Failed to rewrite one or more handles to broker client.
[3500:2284:0122/222320.461:ERROR:gpu_process_host.cc(370)] !GpuDataManagerImpl::GpuAccessAllowed()
[3500:2284:0122/222320.461:ERROR:browser_gpu_channel_host_factory.cc(120)] Failed to launch GPU process.
[3500:2284:0122/222320.805:ERROR:gpu_process_host.cc(370)] !GpuDataManagerImpl::GpuAccessAllowed()
[3500:2284:0122/222321.085:ERROR:gpu_process_host.cc(370)] !GpuDataManagerImpl::GpuAccessAllowed()
[3500:2284:0122/222321.085:ERROR:browser_gpu_channel_host_factory.cc(120)] Failed to launch GPU process.
[3500:2284:0122/222321.101:ERROR:service_manager_context.cc(252)] Attempting to run unsupported native service: Y:\dev\chromium\src\out\Debug\content_renderer.service.exe


I'm now starting to be suspicious about the setup on my computer. This is a Win7 VM running on parallels, but I never had problem with it before.

Can you build chromium and look at about:gpu? I am heavily refactoring GPU blacklist mechanism these days so it's likely something new changed the blacklist decisions. However, with the info you provided so far, it's impossible for me to tell.

As expected, I couldn't reproduce your issue on my local win bot with top of tree content_shell build.

I will be providing the about:gpu page from my chromium build soon...

Sorry for the late update. I think there's something else going on. I'm getting Aw Snap pages, even when trying to open about:gpu, so I guess I have to see what is making the renderer crash.