[Python-modules-team] Bug#588556: python-pyside.qtgui: diagramscene.py from pyside-examples coredumps

[Kirill Smelkov]

Package: python-pyside.qtgui
Version: 0.3.2-3
Severity: normal

I've tried recently-migrated-to-testing PySide on pyside-examples [1]
repository and discovered that graphicsview/diagramscene/diagramscene.py
coredumps (with both python2.5 & python2.6):

$ ./diagramscene.py 
Segmentation fault (core dumped)

I've tracked this down to a smaller script which is below:

---- 8< d.py ----
#!/usr/bin/env python
# trimmed down diagramscene.py to demonstrate crash in sizeHint()

import sys
from PySide import QtCore, QtGui


class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        self.crashme()

    def crashme(self):
        layout = QtGui.QGridLayout()
        textLayout = QtGui.QGridLayout()
        textLayout.addWidget(QtGui.QLabel("Text"), 1, 0, QtCore.Qt.AlignCenter)
        textWidget = QtGui.QWidget()
        textWidget.setLayout(textLayout)
        layout.addWidget(textWidget, 1, 1)

        itemWidget = QtGui.QWidget()
        itemWidget.setLayout(layout)

        # this crashes
        h = itemWidget.sizeHint()

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.setGeometry(100, 100, 800, 500)
    mainWindow.show()
    sys.exit(app.exec_())
---- 8< -----

The backtrace (without -dbg packages installed) is

Program received signal SIGSEGV, Segmentation fault.
0xb5a8df09 in QWidgetItem::isEmpty() const () from /usr/lib/libQtGui.so.4
(gdb) bt
#0  0xb5a8df09 in QWidgetItem::isEmpty() const () from /usr/lib/libQtGui.so.4
#1  0xb5a8e7f8 in QWidgetItemV2::minimumSize() const () from /usr/lib/libQtGui.so.4
#2  0xb5a81dfa in ?? () from /usr/lib/libQtGui.so.4
#3  0xb5a82d21 in ?? () from /usr/lib/libQtGui.so.4
#4  0xb5a82fff in ?? () from /usr/lib/libQtGui.so.4
#5  0xb5a83073 in QGridLayout::sizeHint() const () from /usr/lib/libQtGui.so.4
#6  0xb6711417 in ?? () from /usr/lib/pymodules/python2.6/PySide/QtGui.so
#7  0xb5a89a38 in QLayout::totalSizeHint() const () from /usr/lib/libQtGui.so.4
#8  0xb5aa3ce3 in QWidget::sizeHint() const () from /usr/lib/libQtGui.so.4
#9  0xb6b36497 in ?? () from /usr/lib/pymodules/python2.6/PySide/QtGui.so
#10 0xb5a8d803 in QWidgetItemV2::updateCacheIfNecessary() const () from /usr/lib/libQtGui.so.4
#11 0xb5a8e840 in QWidgetItemV2::minimumSize() const () from /usr/lib/libQtGui.so.4
#12 0xb5a81dfa in ?? () from /usr/lib/libQtGui.so.4
#13 0xb5a82d21 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb5a82fff in ?? () from /usr/lib/libQtGui.so.4
#15 0xb5a83073 in QGridLayout::sizeHint() const () from /usr/lib/libQtGui.so.4
#16 0xb6711417 in ?? () from /usr/lib/pymodules/python2.6/PySide/QtGui.so
#17 0xb5a89a38 in QLayout::totalSizeHint() const () from /usr/lib/libQtGui.so.4
#18 0xb5aa3ce3 in QWidget::sizeHint() const () from /usr/lib/libQtGui.so.4
#19 0xb6b42a23 in ?? () from /usr/lib/pymodules/python2.6/PySide/QtGui.so
#20 0x080e0f2c in PyEval_EvalFrameEx ()
#21 0x080e1b40 in PyEval_EvalFrameEx ()
#22 0x080e2797 in PyEval_EvalCodeEx ()
#23 0x0816bb3c in ?? ()
#24 0x0806232a in PyObject_Call ()
#25 0x0806a311 in ?? ()
#26 0x0806232a in PyObject_Call ()
#27 0x080b50a4 in ?? ()
#28 0x080acd45 in ?? ()
#29 0x0806232a in PyObject_Call ()
#30 0x080e03fb in PyEval_EvalFrameEx ()
#31 0x080e2797 in PyEval_EvalCodeEx ()
#32 0x080e2897 in PyEval_EvalCode ()
#33 0x080fff4d in PyRun_FileExFlags ()
#34 0x081001b2 in PyRun_SimpleFileExFlags ()
#35 0x0805dd81 in Py_Main ()
#36 0x0805cf6b in main ()


Also the following examples coredumps in the same way (judging by backtrace):

- layouts/{basiclayouts,flowlayout}.py
- widgets/movie/movie.py
- widgets/groupbox.py
- widgets/tetrix.py


Thanks,
Kirill


[1] http://qt.gitorious.org/pyside/pyside-examples

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.33.6-roro-00002-gf825b2a-dirty (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages python-pyside.qtgui depends on:
ii  libc6                   2.11.2-2         Embedded GNU C Library: Shared lib
ii  libgcc1                 1:4.4.4-6        GCC support library
ii  libpyside0.3            0.3.2-3          Python bindings for Qt 4 (base fil
ii  libpython2.6            2.6.5+20100630-2 Shared Python runtime library (ver
ii  libqtcore4              4:4.6.3-1        Qt 4 core module
ii  libqtgui4               4:4.6.3-1        Qt 4 GUI module
ii  libshiboken0.3          0.3.2-2          CPython bindings generator for C++
ii  libstdc++6              4.4.4-6          The GNU Standard C++ Library v3
ii  python                  2.6.5-5          An interactive high-level object-o
ii  python-support          1.0.9            automated rebuilding support for P
ii  python2.5               2.5.5-6          An interactive high-level object-o

python-pyside.qtgui recommends no packages.

python-pyside.qtgui suggests no packages.

-- no debconf information