[PyQt] Freezes and crashes with signal autoconnection

Christian Roche christian.roche.fr at gmail.com
Tue Dec 8 22:10:50 GMT 2009

Hi Phil,

thanks for the detailed explanation, although I have to admit I have a bit
of a hard time following through.. Anyway...

Phil Thompson-5 wrote:
> I've already suggested that you should simplify your ImageLink class so
> that it does not derive from QObject.

Okay but there must be something else here, I did just what you suggested 
http://old.nabble.com/file/p26701730/main.py here  (I had to replace
ImageLink arguments in signal definition with 'PyQt_PyObject', not sure why

Still I get the same crash, after a few get_param iterations though, which
makes me believe it's not a pure GC'ed object issue :

>>python main.py     
> get_param(http://abcdef.net/st/st.php?id=6630&script=1&url=http://g.ftv.com/4/17/377889&p=60,
> url)
> get_param(http://g.ftv.com/4/17/377889, url)                                                      
> [1]    3510 segmentation fault (core dumped)  python main.py    
>>gdb /usr/bin/python core.3510 
> Program terminated with signal 11, Segmentation fault.                                                        
> #0  0x00247ef9 in qpycore_PyObject_FromQString (qstr=@0x9346a5c) at
> qpycore_qstring.cpp:49                    
> 49          if ((obj = PyUnicode_FromUnicode(NULL, qstr.length())) ==
> NULL)         
> (gdb) bt                                                                                                      
> #0  0x00247ef9 in qpycore_PyObject_FromQString (qstr=@0x9346a5c) at
> qpycore_qstring.cpp:49                    
> #1  0x001964b9 in slot_QString___str__ (sipSelf=0xb747450c) at
> sip/QtCore/qstring.sip:449                     
> #2  0x03644edf in _PyObject_Str (v=0xb747450c) at Objects/object.c:415                                        
> #3  0x03654c16 in PyString_Format (format=0xb77df320, args=0xb77e306c) at
> Objects/stringobject.c:4839         
> #4  0x03655e1f in string_mod (v=0x2b2a2928, w=0xb77e306c) at
> Objects/stringobject.c:4116              
> [blah blah blah]

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