Public bug reported:
A few days ago, the development version of the PyGTK application
LottaNZB 0.5 (https://code.edge.launchpad.net/~lottanzb/lottanzb/main)
stopped working because of a segmentation fault during startup. I was
able to track down the problem:
2.16.1-0ubuntu1: Works fine both using Python 2.5 and Python 2.6.
2.16.1-0ubuntu2 when launching the application using Python 2.5: Segmentation
fault.
2.16.1-0ubuntu2 when launching the application using Python 2.6: Works fine.
I wasn't able to produce a simple demonstration of the Python 2.5
problem yet, but in our code the situation is as follows:
class GObjectSingletonMeta(GObjectMeta):
"""GObject singleton metaclass"""
def __init__(mcs, name, bases, _dict):
# THIS IS WHERE THE APPLICATION SEGFAULTS.
GObjectMeta.__init__(mcs, name, bases, _dict)
mcs.__instance = None
def __call__(mcs, *args, **kwargs):
"""Creates an instance of mcs if it doesn't exist yet"""
if mcs.__instance is None:
mcs.__instance = GObjectMeta.__call__(mcs, *args, **kwargs)
return mcs.__instance
class App(GObject, kiwi.environ.Application):
__metaclass__ = GObjectSingletonMeta
lock = property(type=object)
[...]
It's possible to prevent the application from segfaulting in the
singleton metaclass by *either* removing the Application parent class
from the App class or by removing all GObject properties from the App
class.
I'm using an up-to-date Jaunty amd64 machine. I only exchanged the
python-gobject package for the tests.
I'll try to provide further information about the problem and I wonder
if someone else can reproduce this. You can try to reproduce the problem
by branching the project and running ./run-lottanzb.sh (which will run
the application using Python 2.5 by default).
** Affects: lottanzb
Importance: Undecided
Status: New
** Affects: pygobject (Ubuntu)
Importance: Undecided
Status: New
--
Segfault starting with 2.16.1-0ubuntu2 using Python 2.5
https://bugs.launchpad.net/bugs/334784
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