CEF Event loop stops working?

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Ivan Voras

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Apr 3, 2017, 8:36:29 AM4/3/17

to CEF Python

Hi,

On to the next problem. :)

Occasionally, it seems like the CEF event loop simply stops working, or at least no OnPaint() events get posted. I've added logging each time OnPaint() is called and when this problem occurs, it's not called even once.

Here's what the log shows on a normal run:

[CEF Python] Initialize() called [87/1991]

[CEF Python] CefExecuteProcess(): exitCode = -1

[CEF Python] CefInitialize()

[CEF Python] App_OnBeforeCommandLineProcessing_BrowserProcess()

[CEF Python] Command line string for the browser process: --browser-subprocess-path=/usr/local/lib/python3.5/dist-packages/cefpython3/subprocess --no-sandbox --lang=en-US --log-file=/tmp/cef.log --log-sev

erity=info --resources-dir-path=/usr/local/lib/python3.5/dist-packages/cefpython3 --locales-dir-path=/usr/local/lib/python3.5/dist-packages/cefpython3/locales --remote-debugging-port=50877 --disable-web-security

=true --ignore-gpu-blacklist=true

[CEF Python] BrowserProcessHandler_OnBeforeChildProcessLaunch()

[CEF Python] Switch already set, ignoring: disable-web-security

[CEF Python] Switch already set, ignoring: ignore-gpu-blacklist

[CEF Python] BrowserProcessHandler_OnBeforeChildProcessLaunch()

[CEF Python] CreateBrowserSync() called

[CEF Python] navigateUrl:

[CEF Python] CefBrowser::CreateBrowserSync()

[CEF Python] GetPyBrowser(): create new PyBrowser, browserId=1

[CEF Python] BrowserProcessHandler_OnBeforeChildProcessLaunch()

[CEF Python] CefBrowser::CreateBrowserSync() succeeded

DEBUG:root:Initialising realtime mode

DEBUG:root:GetViewRect(): 1920x1080

[CEF Python] MessageLoop()

[CEF Python] Command line string for the zygote process: /usr/local/lib/python3.5/dist-packages/cefpython3/subprocess --type=zygote --no-sandbox --lang=en-US --locales-dir-path=/usr/local/lib/python3.5/dist-pack

ages/cefpython3/locales --log-file=/tmp/cef.log --log-severity=info --resources-dir-path=/usr/local/lib/python3.5/dist-packages/cefpython3 --disable-web-security=true --ignore-gpu-blacklist=true

DEBUG:root:GetViewRect(): 1920x1080

[CEF Python] Renderer: OnContextCreated()

[CEF Python] Browser: OnProcessMessageReceived(): OnContextCreated

[CEF Python] V8ContextHandler_OnContextCreated()

[0403/142855.005520:ERROR:gl_surface_glx.cc(411)] GLX 1.3 or later is required.

[0403/142855.005656:ERROR:gl_initializer_x11.cc(130)] GLSurfaceGLX::InitializeOneOff failed.

[0403/142855.010445:ERROR:gpu_child_thread.cc(327)] Exiting GPU process due to errors during initialization

[0403/142855.021730:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

[0403/142855.022240:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

[0403/142855.022928:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

[0403/142855.023129:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

DEBUG:root:GetViewRect(): 1920x1080

[0403/142855.024333:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

DEBUG:root:OnLoadStart()

DEBUG:root:OnAddressChange():

DEBUG:root:OnStatusMessage():

DEBUG:root:OnTitleChange(): kirupa.com - It's Alive

DEBUG:root:OnLoadEnd()

DEBUG:root:OnLoadingStateChange()

DEBUG:root:OnTitleChange(): kirupa.com - It's Alive

DEBUG:root:OnPaint() raw mode 1, status 0, n_onpaint 1

DEBUG:root:First OnPaint()

DEBUG:root:GetViewRect(): 1920x1080

DEBUG:root:OnPaint() raw mode 1, status 3, n_onpaint 2

DEBUG:root:OnPaint() raw mode 1, status 3, n_onpaint 3

DEBUG:root:OnPaint() raw mode 1, status 3, n_onpaint 4

DEBUG:root:OnPaint() raw mode 1, status 3, n_onpaint 5

...

And here's how it looks when OnPaint is never called:

[CEF Python] Initialize() called [4/1991]

[CEF Python] CefExecuteProcess(): exitCode = -1

[CEF Python] CefInitialize()

[CEF Python] App_OnBeforeCommandLineProcessing_BrowserProcess()

=true --ignore-gpu-blacklist=true

[CEF Python] BrowserProcessHandler_OnBeforeChildProcessLaunch()

[CEF Python] Switch already set, ignoring: disable-web-security

[CEF Python] Switch already set, ignoring: ignore-gpu-blacklist

[CEF Python] BrowserProcessHandler_OnBeforeChildProcessLaunch()

[CEF Python] CreateBrowserSync() called

[CEF Python] navigateUrl:

[CEF Python] CefBrowser::CreateBrowserSync()

[CEF Python] GetPyBrowser(): create new PyBrowser, browserId=1

[CEF Python] BrowserProcessHandler_OnBeforeChildProcessLaunch()

[CEF Python] CefBrowser::CreateBrowserSync() succeeded

DEBUG:root:Initialising realtime mode

DEBUG:root:GetViewRect(): 1920x1080

[CEF Python] MessageLoop()

ages/cefpython3/locales --log-file=/tmp/cef.log --log-severity=info --resources-dir-path=/usr/local/lib/python3.5/dist-packages/cefpython3 --disable-web-security=true --ignore-gpu-blacklist=true

DEBUG:root:GetViewRect(): 1920x1080

[CEF Python] Renderer: OnContextCreated()

[CEF Python] Browser: OnProcessMessageReceived(): OnContextCreated

[CEF Python] V8ContextHandler_OnContextCreated()

[0403/142912.713426:ERROR:gl_surface_glx.cc(411)] GLX 1.3 or later is required.

[0403/142912.713505:ERROR:gl_initializer_x11.cc(130)] GLSurfaceGLX::InitializeOneOff failed.

[0403/142912.718239:ERROR:gpu_child_thread.cc(327)] Exiting GPU process due to errors during initialization

[0403/142912.728610:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

[0403/142912.729253:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

DEBUG:root:GetViewRect(): 1920x1080

DEBUG:root:OnLoadStart()

DEBUG:root:OnAddressChange():

DEBUG:root:OnStatusMessage():

[0403/142912.735744:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

[0403/142912.739874:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

[0403/142912.740375:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

DEBUG:root:OnTitleChange(): kirupa.com - It's Alive

DEBUG:root:OnLoadEnd()

DEBUG:root:OnLoadingStateChange()

DEBUG:root:OnTitleChange(): kirupa.com - It's Alive

DEBUG:root:GetViewRect(): 1920x1080

DEBUG:root:RecordWatchdogThread: WOOF! (# OnPaints: 0, # frames: 0)

WARNING:root:No frame for 10.0 seconds

They are different, but I don't know what differences are significant? I'm guessing somehow the message loop doesn't even get started, but the code is always the same, and cefpython.MessageLoop() is called unconditionally.

Any ideas?

Czarek Tomczak

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Apr 3, 2017, 9:27:23 AM4/3/17

to CEF Python

You have some very obvious errors in the logs that you need to resolve. Have you set the --ignore-gpu-blacklist=true flag manually? If so expect problems.

Try googling these errors:

[0403/142855.005520:ERROR:gl_surface_glx.cc(411)] GLX 1.3 or later is required.

[0403/142855.005656:ERROR:gl_initializer_x11.cc(130)] GLSurfaceGLX::InitializeOneOff failed.

[0403/142855.010445:ERROR:gpu_child_thread.cc(327)] Exiting GPU process due to errors during initialization

[0403/142855.021730:ERROR:browser_gpu_channel_host_factory.cc(113)] Failed to launch GPU process.

To disable GPU see:
https://github.com/cztomczak/cefpython/blob/master/docs/Knowledge-Base.md#black-or-white-browser-screen

You can try running the upstream cefclient sample application with the --off-screen-rendering-enabled command line flag to see if the problem also reproduces. See https://github.com/cztomczak/cefpython/blob/master/docs/Knowledge-Base.md#feature-x-works-in-google-chrome-but-doesnt-work-in-cef-python

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