[PyQt] This program made python seg fault,how to solve?

[Fei Xue]

Hi!  The code below can make python seg fault. Steps to reproduce: run this
program,modify the value of a cell, then click submit button,python will seg
fault.The correct result is the value of the second column will change to
999 after click submit buttoon.

When I use PyQt 4.4,the crash will not happen.Under  PyQt 4.5/4.6,python
does crash.
# -*- coding: utf-8 -*-
from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4.QtSql import *
import sys
def createConnection():
    db=QSqlDatabase.addDatabase("QSQLITE")
    db.setDatabaseName("test0.db")
    db.open()

def createTable():
    q=QSqlQuery()
    q.exec_("create table if not exists t1 (f1 integer primary key,f2
integer)")
    q.exec_("delete from t1")
    q.exec_("insert into t1 values(1,0)")
    q.exec_("insert into t1 values(2,3)")
    q.exec_("commit")


class Model(QSqlTableModel):
    def __init__(self,parent=None):
        QSqlTableModel.__init__(self,parent)
        self.setTable("t1")
        self.select()
        self.setEditStrategy(QSqlTableModel.OnManualSubmit)
        self.connect(self,SIGNAL("beforeUpdate(int,QSqlRecord&)"),
                     self.beforeUpdateTable)
    def beforeUpdateTable(self,row,rec):
        rec.setValue("f1",999)
class TestWidget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        vbox=QVBoxLayout(self)
        t=QTableView()
        m=Model()
        t.setModel(m)
        b=QPushButton("submit")
        vbox.addWidget(t)
        vbox.addWidget(b)
        self.connect(b,SIGNAL("clicked()"),m.submitAll)
def main():
    a=QApplication(sys.argv)
    createConnection()
    createTable()
    w=TestWidget()
    w.show()
    sys.exit(a.exec_())
if __name__=="__main__":
    main()
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