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Linux: Crash in Qt and wxPython examples during browser creation due to x11 FindChild() failing #452

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Linux: Crash in Qt and wxPython examples during browser creation due to x11 FindChild() failing#452
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bugexampleslinuxnext releasepatch availableqtupstream bugwxpython
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v66

Description

@cztomczak
cztomczak
opened on Aug 17, 2018

This needs to be patched during next CEF Python release (internal patch or merged PR upstream).

Reported in upstream CEF tracker:
https://bitbucket.org/chromiumembedded/cef/issues/2490/x11-findchild-fails-during-a-call-to

Reported problem on the CEF Forum:
https://magpcss.org/ceforum/viewtopic.php?f=6&t=16203

Reproducible so far with the following examples:

  • PyQt4
  • PySide
  • wxPython 4 - reported here

The PyQt5 example works fine (Python 3.6, Ubuntu 14.04 same machine).

Stack trace for qt.py pyqt4 example running on Python 2.7.6 and Ubuntu 14.04:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff1d9e0bf in FindChild () at ../../cef/libcef/browser/native/window_x11.cc:44
44	../../cef/libcef/browser/native/window_x11.cc: No such file or directory.
(gdb) bt
#0  0x00007ffff1d9e0bf in FindChild () at ../../cef/libcef/browser/native/window_x11.cc:44
#1  Show () at ../../cef/libcef/browser/native/window_x11.cc:178
#2  0x00007ffff1d9aa57 in CreateHostWindow ()
    at ../../cef/libcef/browser/native/browser_platform_delegate_native_linux.cc:89
#3  0x00007ffff1cb5879 in CreateHostWindow () at ../../cef/libcef/browser/browser_host_impl.cc:3159
#4  CreateInternal () at ../../cef/libcef/browser/browser_host_impl.cc:418
#5  0x00007ffff1cb436f in Create () at ../../cef/libcef/browser/browser_host_impl.cc:359
#6  0x00007ffff1cb3b3d in CreateBrowserSync () at ../../cef/libcef/browser/browser_host_impl.cc:275
#7  0x00007ffff046be21 in cef_browser_host_create_browser_sync ()
    at ../../cef/libcef_dll/cpptoc/browser_host_cpptoc.cc:94
#8  0x00007fffe743ad58 in CefBrowserHost::CreateBrowserSync(CefWindowInfo const&, scoped_refptr<CefClient>, CefStringBase<CefStringTraitsUTF16> const&, CefStructBase<CefBrowserSettingsTraits> const&, scoped_refptr<CefRequestContext>) ()
   from /usr/local/lib/python2.7/dist-packages/cefpython3/cefpython_py27.so
#9  0x00007fffffffcb70 in ?? ()
#10 0x0000000001067c50 in ?? ()
#11 0x00000000010406b0 in ?? ()
#12 0x00000000010406b0 in ?? ()
#13 0x00007fffe76f2fc0 in __pyx_v_14cefpython_py27_g_external_message_pump ()
   from /usr/local/lib/python2.7/dist-packages/cefpython3/cefpython_py27.so
#14 0x00000000009420a0 in ?? ()
#15 0x00007fffffffcd60 in ?? ()
#16 0x00007fffe24a4fc8 in ?? ()
#17 0x00007ffff7e7f8f0 in ?? ()
#18 0x0000000000000000 in ?? ()

Stack for qt.py pyside is the same.

Corresponding CEF source codes for the stack trace:
0. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/native/window_x11.cc#L44

  1. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/native/window_x11.cc#L178
  2. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/native/browser_platform_delegate_native_linux.cc#L89
  3. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/browser_host_impl.cc#L3159
  4. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/browser_host_impl.cc#L418
  5. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/browser_host_impl.cc#L359
  6. https://github.com/chromiumembedded/cef/blob/3359/libcef/browser/browser_host_impl.cc#L275

Activity

  1. cztomczak
    added
    bug
    examples
    on Aug 17, 2018
  2. cztomczak
    added this to the v66 milestone on Aug 17, 2018
  3. cztomczak
    changed the title [-]PyQt4 and PyQt5 examples crash during browser creation on Linux[/-] [+]PyQt4 and PySide examples crash during browser creation on Linux[/+] on Aug 17, 2018
  4. cztomczak
    changed the title [-]PyQt4 and PySide examples crash during browser creation on Linux[/-] [+]PyQt4 and PySide examples crash during browser creation on Linux due to x11 FindChild() failing[/+] on Aug 17, 2018
  5. cztomczak
    added
    qt
    linux
    on Aug 17, 2018
  6. cztomczak
    added a commit that references this issue on Aug 17, 2018

    Update run_examples.py (#452)

    cb9628b

  7. cztomczak commented on Aug 17, 2018

    @cztomczak
    cztomczak
    on Aug 17, 2018
    OwnerAuthor

    PyQt4 and PySide examples disabled from auto running in commit cb9628b.

  8. cztomczak
    added
    upstream bug
    on Aug 20, 2018

  9. cztomczak commented on Dec 5, 2018

    @cztomczak
    cztomczak
    on Dec 5, 2018
    OwnerAuthor

    I've provided a patch that fixes the issue in upstream CEF. However this still needs testing with PyQt4 and PySide to see if that resolves the issue completely.

  10. cztomczak
    changed the title [-]PyQt4 and PySide examples crash during browser creation on Linux due to x11 FindChild() failing[/-] [+]Linux: Crash in Qt and wxPython examples during browser creation due to x11 FindChild() failing[/+] on Feb 27, 2019
  11. cztomczak
    added
    next release
    wxpython
    on Feb 27, 2019

  12. dee42 commented on Aug 8, 2019

    @dee42
    dee42
    on Aug 8, 2019

    This is biting me with wxPython 4 with GTK 3. Is there any way to work around the issue with cefpython 66? If not, when are you expecting the next cefpython release?

  13. cztomczak commented on Aug 8, 2019

    @cztomczak
    cztomczak
    on Aug 8, 2019
    OwnerAuthor

    @dee42 You can build CEF 66 from sources and apply the patch. See the build instructions document and inject the patch via patches/patch.py script before building. There is no known schedule for the next release at the moment.

  14. dee42 commented on Aug 15, 2019

    @dee42
    dee42
    on Aug 15, 2019

    @cztomczak Thanks. I've done so, but there seem to be knock-on issues. With that patch, I see a consistent segmentation fault which seems very similar to the crash reported here: https://magpcss.org/ceforum/viewtopic.php?f=6&t=16634. Traceback is:

    (gdb) bt
#0  0x00007ffff352f2e1 in XRenderCreatePicture () at /usr/lib/libXrender.so.1
#1  0x00007fffef866298 in EndPaint() () at ../../components/viz/service/display_embedder/software_output_device_x11.cc:86
#2  0x00007fffef82d840 in FinishDrawingFrame() () at ../../components/viz/service/display/software_renderer.cc:66
#3  0x00007fffef803831 in DrawFrame() () at ../../components/viz/service/display/direct_renderer.cc:332
#4  0x00007fffef807402 in DrawAndSwap() () at ../../components/viz/service/display/display.cc:356
#5  0x00007fffef80949e in DrawAndSwap () at ../../components/viz/service/display/display_scheduler.cc:213
#6  0x00007fffef80949e in AttemptDrawAndSwap() () at ../../components/viz/service/display/display_scheduler.cc:487
#7  0x00007fffef808cda in OnBeginFrameDeadline() () at ../../components/viz/service/display/display_scheduler.cc:503
#8  0x00007fffee801a0d in Run () at ../../base/callback.h:95
#9  0x00007fffee801a0d in RunTask() () at ../../base/debug/task_annotator.cc:61
#10 0x00007fffee81dc6b in RunTask() () at ../../base/message_loop/message_loop.cc:395
#11 0x00007fffee81e2b5 in DeferOrRunPendingTask () at ../../base/message_loop/message_loop.cc:407
#12 0x00007fffee81e2b5 in DoWork() () at ../../base/message_loop/message_loop.cc:451
#13 0x00007fffee81f6ae in HandleDispatch () at ../../base/message_loop/message_pump_glib.cc:263
#14 0x00007fffee81f6ae in WorkSourceDispatch() () at ../../base/message_loop/message_pump_glib.cc:109
#15 0x00007ffff44d7cf4 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#16 0x00007ffff44d9b11 in  () at /usr/lib/libglib-2.0.so.0
#17 0x00007ffff44d9b51 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#18 0x00007fffee81f4a3 in base::MessagePumpGlib::Run(base::MessagePump::Delegate*) () at ../../base/message_loop/message_pump_glib.cc:305
#19 0x00007fffee83d788 in Run () at ../../base/run_loop.cc:133
#20 0x00007fffee83d788 in RunUntilIdle() () at ../../base/run_loop.cc:146
#21 0x00007fffee6a46bf in CefBrowserMessageLoop::DoMessageLoopIteration() () at ../../cef/libcef/browser/browser_message_loop.cc:116
#22 0x00007fffea6206a8 in __pyx_pw_14cefpython_py27_35MessageLoopWork(_object*, _object*) [clone .lto_priv.278] ()
    at python/lib/python2.7/site-packages/cefpython3/cefpython_py27.so
#23 0x00007ffff7ebba8d in call_function (oparg=<optimized out>, pp_stack=0x7fffffffc6e0) at Python/ceval.c:4360
#24 0x00007ffff7ebba8d in PyEval_EvalFrameEx (f=f@entry=0x7fffa40cb050, throwflag=throwflag@entry=0) at Python/ceval.c:3013
#25 0x00007ffff7ebe278 in PyEval_EvalCodeEx
    (co=<optimized out>, globals=<optimized out>, locals=locals@entry=0x0, args=args@entry=0x7ffff6ec77b8, argcount=<optimized out>, kws=kws@entry=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:3608
#26 0x00007ffff7e3a07b in function_call (func=0x7fffeacde320, arg=0x7ffff6ec77a0, kw=0x0) at Objects/funcobject.c:523
#27 0x00007ffff7e0d4a3 in PyObject_Call (func=func@entry=0x7fffeacde320, arg=arg@entry=0x7ffff6ec77a0, kw=kw@entry=0x0) at Objects/abstract.c:2544
#28 0x00007ffff7e1c4cc in instancemethod_call (func=0x7fffeacde320, arg=0x7ffff6ec77a0, kw=0x0) at Objects/classobject.c:2600
#29 0x00007ffff7e0d4a3 in PyObject_Call (func=func@entry=0x7ffff2b146e0, arg=arg@entry=0x7fffeacdc450, kw=0x0) at Objects/abstract.c:2544
#30 0x00007ffff7eb3d68 in PyEval_CallObjectWithKeywords (func=func@entry=0x7ffff2b146e0, arg=arg@entry=0x7fffeacdc450, kw=kw@entry=0x0) at Python/ceval.c:4245
#31 0x00007ffff62ab357 in wxPyCallback::EventThunker(wxEvent&) (this=<optimized out>, event=...) at ../../../../sip/cpp/sip_corewxEvtHandler.cpp:71
#32 0x00007ffff569906e in wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&) ()
    at python/lib/python2.7/site-packages/wx/libwx_baseu-3.0.so.0

    Ever seen anything like this?

  15. cztomczak commented on Aug 16, 2019

    @cztomczak
    cztomczak
    on Aug 16, 2019
    OwnerAuthor

    @dee42 No, first time seeing such error in CEF Python. Feel free to create a new issue for this error. Test with original wxpython.py example.

  16. cztomczak commented on Jan 12, 2020

    @cztomczak
    cztomczak
    on Jan 12, 2020
    OwnerAuthor

    This is fixed in upstream CEF in v78+.

  17. cztomczak
    added
    patch available
    on Jan 12, 2020

  18. jorikdima commented on Jan 31, 2020

    @jorikdima
    jorikdima
    on Jan 31, 2020

    This is fixed in upstream CEF in v78+.

    Czarek, I created a thread a year ago. Seems like now it's fixed in CEF. But when can we expect a new release of CEF python? If not soon what is my options? Should I rebuild existing CEF python against new CEF? But here you mentioned that versions should match, so 66 only as for today. Should I follow #264 like mentioned in the Notes?
    Otherwise I still can't use CEFpython with wxPython on Linux GTK3
    Thank you

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