[PyQt] Segfault when activating items in a view

peter at lohmanders.se peter at lohmanders.se
Mon Aug 9 08:09:32 BST 2010


No matter how I implement my own item models, they segfault when ever they 
are used with a view and an item is activated.

Example minimalistic model I test with:

import sys
from PyQt4 import QtGui, QtCore

class TestModel(QtCore.QAbstractTableModel):

    def headerData(self, section, orientation, role = 
        return QtCore.QVariant("a")

    def data(self, index, role = QtCore.Qt.DisplayRole):
        if role == QtCore.Qt.DisplayRole:
            return QtCore.QVariant("t")
        return QtCore.QVariant()

    def columnCount(self, index):
        return 2

    def rowCount(self, index):
        return 2

def onActivated():
    print "activated"

if __name__ == "__main__":
    app = QtGui.QApplication([])
    win = QtGui.QMainWindow()
    model = TestModel()
    view = QtGui.QTreeView()
    app.connect(view, QtCore.SIGNAL("activated("")"),

To reproduce the segfault I set the model for a table or tree view and just 
double click one of the 4 empty cells. If the item is editable the editor 
appears and nothing happens. If the item is not editable and is activated 
there's a delay of 0.5-1.0 seconds before a segfault pops up.

I get no warnings and no errors from PyQt or Python and I don't have the 
debug versions available, but here's the bt from gdb anyway:

#0  0x00007ffff7abab7f in PyDict_GetItem () from 
#1  0x00007ffff7aa9d10 in PyFrame_New () from /usr/lib/libpython2.6.so.1.0
#2  0x00007ffff7b16c97 in PyEval_EvalCodeEx () from 
#3  0x00007ffff7aaa9cf in function_call () from /usr/lib/libpython2.6.so.1.0
#4  0x00007ffff7a83893 in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#5  0x00007ffff7a9644f in instancemethod_call () from 
#6  0x00007ffff7a83893 in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#7  0x00007ffff7b0fb43 in PyEval_CallObjectWithKeywords () from 
#8  0x00007ffff425413b in ?? () from /usr/lib/python2.6/site-packages/sip.so
#9  0x00007ffff59bad94 in ?? () from 
#10 0x00007ffff5a99460 in ?? () from 
#11 0x00007ffff560a3bd in QAbstractTableModel::hasChildren(QModelIndex 
const&) const () from /usr/lib/libQtCore.so.4
#12 0x00007ffff336d977 in ?? () from /usr/lib/libQtGui.so.4

Obviously, no matter how bad you write your models PyQt shouldn't segfault.
I use version 4.7.4-2 on a 64-bit Linux system (Archlinux), but it also 
segfaults with 4.4.4-6 on a Debian system.

This is a new problem, I have many models in other applications that work 
fine, I have no idea why this is happening, any help is appreciated.


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