[Kde-bindings] [Bug 253123] New: KConfigSkeleton segfaults with PyQt4 API version 2

[Wolfgang Rohdewald]

https://bugs.kde.org/show_bug.cgi?id=253123

           Summary: KConfigSkeleton segfaults with PyQt4 API version 2
           Product: bindings
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
        AssignedTo: kde-bindings at kde.org
        ReportedBy: wolfgang at rohdewald.de


Version:           unspecified (using KDE 4.5.1) 
OS:                Linux

In the PyQt4 API version 2, there is no class QString, strings are
transparently translated between QString and Python strings. The following code
always prints random output because some variable is freed somewhere while
still being needed.

If PyKDE4 does not yet support API version 2, it should at least check against
this when starting but not segfault. Also,
http://techbase.kde.org/Development/Languages/Python 
says nothing about API version compatibilities. I think it should.

Reproducible: Always

Steps to Reproduce:
import sip
sip.setapi('QString', 2)

from PyKDE4.kdeui import KConfigSkeleton

a = KConfigSkeleton()
name = 'tilesetName'
value = 'I am a value'
s = a.addItemString(name, value)
print s.value()

(gdb) run bug.py


Actual Results:  
value is: 㟀翿!麨翿刐Ï @翿偈

Program received signal SIGSEGV, Segmentation fault.
~QString (node=0xcf6cff) at /usr/include/qt4/QtCore/qstring.h:882
882     inline QString::~QString() { if (!d->ref.deref()) 
free(d); }
(gdb) bt
#0  ~QString (node=0xcf6cff) at 
/usr/include/qt4/QtCore/qstring.h:882
#1  ~QHashNode (node=0xcf6cff) at 
/usr/include/qt4/QtCore/qhash.h:217
#2  QHash<QString, KConfigSkeletonItem*>::deleteNode2 
(node=0xcf6cff)
    at /usr/include/qt4/QtCore/qhash.h:519
#3  0x00007ffff428cc6d in QHashData::free_helper (this=0xcf5160, 
node_delete=
    0x7ffff47520d0 <QHash<QString, 
KConfigSkeletonItem*>::deleteNode2(QHashData::Node*)>)
    at tools/qhash.cpp:271
#4  0x00007ffff474ee70 in QHash<QString, 
KConfigSkeletonItem*>::freeData (this=0xcad330, 
    __in_chrg=<value optimized out>) at 
/usr/include/qt4/QtCore/qhash.h:568
#5  ~QHash (this=0xcad330, __in_chrg=<value optimized out>)
    at /usr/include/qt4/QtCore/qhash.h:284
#6  ~Private (this=0xcad330, __in_chrg=<value optimized out>)
    at ../../kdecore/config/kcoreconfigskeleton_p.h:40
#7  ~KCoreConfigSkeleton (this=0xcad330, __in_chrg=<value 
optimized out>)
    at ../../kdecore/config/kcoreconfigskeleton.cpp:1005
#8  0x00007ffff5e6fecc in 
sipKConfigSkeleton::~sipKConfigSkeleton() ()
   from /usr/lib/pymodules/python2.6/PyKDE4/kdeui.so
#9  0x00007ffff5e02cbc in ?? () from 
/usr/lib/pymodules/python2.6/PyKDE4/kdeui.so
#10 0x00007ffff67a77f9 in ?? () from 
/usr/lib/pymodules/python2.6/sip.so
#11 0x000000000046d2d8 in subtype_dealloc (self=<KConfigSkeleton 
at remote 0x97cf30>)
    at ../Objects/typeobject.c:1019
#12 0x000000000044e577 in insertdict (mp=0x8c8270, key='a', 
hash=12416037344, value=None)
    at ../Objects/dictobject.c:459
#13 0x0000000000450a77 in PyDict_SetItem (op=
    {'a': None, 'sip': <module at remote 0x7ffff7f03b40>, 'name': 
'tilesetName', '__builtins__': <module at remote 0x7ffff7fa2868>, 
'KConfigSkeleton': <PyQt4.QtCore.pyqtWrapperType at remote 
0xc77e20>, 'value': 'I am a value', '__package__': None, 's': 
<ItemString at remote 0xc3c050>, '__name__': '__main__', 
'__doc__': None}, key='a', value=None)
    at ../Objects/dictobject.c:701
#14 0x000000000045297e in _PyModule_Clear (m=<value optimized 
out>)
    at ../Objects/moduleobject.c:138
#15 0x00000000004bb5fa in PyImport_Cleanup () at 
../Python/import.c:441
#16 0x00000000004c922f in Py_Finalize () at 
../Python/pythonrun.c:438
#17 0x000000000041a296 in Py_Main (argc=-135380864, argv=<value 
optimized out>)
    at ../Modules/main.c:596
#18 0x00007ffff69d9c4d in __libc_start_main (main=<value 
optimized out>, 
    argc=<value optimized out>, ubp_av=<value optimized out>, 
init=<value optimized out>, 
    fini=<value optimized out>, rtld_fini=<value optimized out>, 
stack_end=0x7fffffffddc8)
    at libc-start.c:226
#19 0x00000000004199f9 in _start ()


Expected Results:  
value is: 'I am a value'

ii  python-qt4                                         
4.7.3-1ubuntu2~lucid1~ppa3                      Python bindings 
for Qt4

ii  python-kde4                                        
4:4.5.1-0ubuntu1~lucid1~ppa1                    Python bindings 
for the KDE 4 libraries

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