[PyQt] Re: PyQt4 gc problems

[Tim Blechmann]

>> i've upgraded to the latest debian packages of pyqt and sip (4.7.1).
>> however i still experience the problem, described above ...
>>
>> is this issue known to be completely fixed?
> 
> No bug is ever known to be fixed, only that it cannot be reproduced with
> current test cases. Have you got a small, complete test case?
> 
> Phil

hm ... i don't have a test case for the issue, as i am using a small pyqt 
gui, with a c++ python module, that itself calls python code from a 
different thread.
the assertion failure (posted in my first mail) is triggered from the 
python gc, which is executed from this thread, which is launched from the 
c++ code (and thus is not a qthread)

maybe the backtrace is more helpful for you than for me:

d2.1> dwhere
>  0 __kernel_vsyscall PC=0xffffe410, FP=0xb2d64248 [@syscall_library at -32]
   1 raise            PC=0xb7d997ef, FP=0xb2d6425c [/lib/i686/cmov/libc.so.6]
   2 abort            PC=0xb7d9b17c, FP=0xb2d64388 [/lib/i686/cmov/libc.so.6]
   3 _Z17qt_message_output9QtMsgTypePKc PC=0xb77d1fd8, FP=0xb2d643b8 [/usr/lib/libQtCore.so.4.3.1.debug]
   4 _Z6qFatalPKcz    PC=0xb77d203c, FP=0xb2d663e8 [/usr/lib/libQtCore.so.4.3.1.debug]
   5 _Z11qt_assert_xPKcS0_S0_i PC=0xb77d2081, FP=0xb2d66408 [/usr/lib/libQtCore.so.4.3.1.debug]
   6 _ZN23QCoreApplicationPrivate19checkReceiverThreadEP7QObject PC=0xb7890b42, FP=0xb2d66478 [/usr/lib/libQtCore.so.4.3.1.debug]
   7 _ZN12QApplication6notifyEP7QObjectP6QEvent PC=0xb682fb89, FP=0xb2d667e8 [/usr/lib/libQtGui.so.4.3.1.debug]
   8 initQtGui        PC=0xb7349676, FP=0xb2d66828 [/usr/lib/python2.4/site-packages/PyQt4/QtGui.so]
   9 _ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent PC=0xb788f88c, FP=0xb2d66858 [/usr/lib/libQtCore.so.4.3.1.debug]
  10 _ZN16QCoreApplication9sendEventEP7QObjectP6QEvent PC=0xb7892c52, FP=0xb2d66878 [/usr/lib/libQtCore.so.4.3.1.debug]
  11 _ZN14QObjectPrivate16setParent_helperEP7QObject PC=0xb789f077, FP=0xb2d668c8 [/usr/lib/libQtCore.so.4.3.1.debug]
  12 _ZN7QObjectD2Ev  PC=0xb78a4872, FP=0xb2d668f8 [/usr/lib/libQtCore.so.4.3.1.debug]
  13 _ZN7QLayoutD2Ev  PC=0xb685a411, FP=0xb2d66928 [/usr/lib/libQtGui.so.4.3.1.debug]
  14 _ZN17QMainWindowLayoutD0Ev PC=0xb6be61ee, FP=0xb2d66938 [/usr/lib/libQtGui.so.4.3.1.debug]
  15 _ZN7QWidgetD2Ev  PC=0xb688403e, FP=0xb2d66998 [/usr/lib/libQtGui.so.4.3.1.debug]
  16 _ZN11QMainWindowD2Ev PC=0xb6be2edc, FP=0xb2d669a8 [/usr/lib/libQtGui.so.4.3.1.debug]
  17 initQtGui        PC=0xb71dff2e, FP=0xb2d669d8 [/usr/lib/python2.4/site-packages/PyQt4/QtGui.so]
  18 initQtGui        PC=0xb71acecf, FP=0xb2d669f8 [/usr/lib/python2.4/site-packages/PyQt4/QtGui.so]
  19 initQtGui        PC=0xb71acf22, FP=0xb2d66a08 [/usr/lib/python2.4/site-packages/PyQt4/QtGui.so]
  20 sip_api_free     PC=0xb7931dec, FP=0xb2d66a38 [/usr/lib/python2.4/site-packages/sip.so]
  21 PyType_GenericAlloc PC=0x0808d0ff, FP=0xb2d66a68 [/usr/bin/python2.4]
  22 _PyObject_GC_UnTrack PC=0x080e4849, FP=0xb2d66ae8 [/usr/bin/python2.4]
  23 _PyObject_GC_New PC=0x080e4e7e, FP=0xb2d66b08 [/usr/bin/python2.4]
  24 PyDict_New       PC=0x0807dbe6, FP=0xb2d66b28 [/usr/bin/python2.4]
  25 PyFrame_New      PC=0x08100fc0, FP=0xb2d66b58 [/usr/bin/python2.4]
  26 PyEval_EvalCodeEx PC=0x080ba954, FP=0xb2d66bf8 [/usr/bin/python2.4]
  27 PyEval_EvalFrame PC=0x080b948d, FP=0xb2d66d68 [/usr/bin/python2.4]
  28 PyEval_EvalCodeEx PC=0x080bb120, FP=0xb2d66e08 [/usr/bin/python2.4]
  29 PyClassMethod_New PC=0x08101a0c, FP=0xb2d66e68 [/usr/bin/python2.4]
  30 PyObject_Call    PC=0x0805a4f5, FP=0xb2d66e88 [/usr/bin/python2.4]
  31 PyClass_IsSubclass PC=0x0805fd92, FP=0xb2d670c8 [/usr/bin/python2.4]
  32 PyObject_Call    PC=0x0805a4f5, FP=0xb2d670e8 [/usr/bin/python2.4]
  33 PyEval_CallObjectWithKeywords PC=0x080b4577, FP=0xb2d67108 [/usr/bin/python2.4]
  34 PyEval_CallFunction PC=0x080db127, FP=0xb2d67138 [/usr/bin/python2.4]
  35 boost::python::override::operator ()<boost::python::handle<_object> > PC=0xb5ddca8a, FP=0xb2d67168 [/home/tim/workspace/nova-stable/libs/boost/boost/python/override.hpp#138]
  36 py_nova::py_interpreter::new_connection_callback PC=0xb5ddd0ca, FP=0xb2d671a8 [/home/tim/workspace/nova-stable/source/gui/py_gui_wrapper.cpp#122]


thanks, tim

-- 
tim at klingt.org    ICQ: 96771783
http://tim.klingt.org

All we composers really have to work with is time and sound - and
sometimes I'm not even sure about sound.
  Morton Feldman