Re: [Pyobjc-dev] autorelease pool page corrupted

[Jake W. <del...@gm...>]

Hi Ronald,

Thanks for your response! You reply only arrived once, so no worries :)

I've arranged a small app to reproduce this issue. Please see the source
code from this link: https://github.com/jiakuan/wx-sample

*New findings*

While preparing the small app, I found that the issue might be related to
two event binds together with a multiple-thread environment:

    app.Bind(wx.EVT_QUERY_END_SESSION, OnUnexpectedExit)
    app.Bind(wx.EVT_END_SESSION, OnUnexpectedExit)

*Sample project description*

Test 1: From the sample project, please run *test_wx_and_event_1.py*, you
will see a taskbar icon. When you click the taskbar icon and select "Close
wxPython Sample", the app quit correctly without any issues.

Test 2: From the sample project, please run *test_wx_and_event_2.py*, you
will also see a taskbar icon. When you click the taskbar icon and select
"Close wxPython Sample", the app quit with a system dialog as the same as
the one I attached in my previous post, and an error message will be
printed in console like the following:

objc[9303]: autorelease pool page 0x103889000 corrupted
  magic 0x1038a800 0x70000000 0x1039c000 0x50000000
  pthread 0x7fff79c40180

If we comment two lines (line 145 and 146) in test_wx_and_event_2.py

      # self.Bind(wx.EVT_QUERY_END_SESSION, self.OnUnexpectedExit)
      # self.Bind(wx.EVT_END_SESSION, self.OnUnexpectedExit)

then no such error when quitting app from the taskbar menu.

The only difference between test_wx_and_event_1.py
and test_wx_and_event_2.py is that the second one used a new thread to
maintain an event queue.

And the issue in test 2 only happened in wxPython 2.9.5.0, no such issues
for wxPython 2.9.4.0.

Really appreciate your help on this issue.

Thanks,
Jake



On Thu, Oct 24, 2013 at 7:55 PM, Ronald Oussoren <ron...@ma...>wrote:

>
> On 22 Oct, 2013, at 15:49, Jake Wang <del...@gm...> wrote:
>
> > Hi,
> >
> > I used PyObjc in a python application for monitoring some global events:
> >
> > class MacOSXEventMonitor():
> >     def init(self):
> >         log.debug("Initializing events monitor for Mac OS X...")
> >
> >         self._observer =
> NSEvent.addGlobalMonitorForEventsMatchingMask_handler_(
> >             NSLeftMouseDownMask
> >             | NSLeftMouseUpMask
> >             | NSRightMouseDownMask
> >             | NSRightMouseUpMask
> >             | NSMouseMovedMask
> >             | NSLeftMouseDraggedMask
> >             | NSRightMouseDraggedMask
> >             | NSMouseEnteredMask
> >             | NSMouseExitedMask
> >             | NSScrollWheelMask
> >             | NSKeyDownMask
> >             | NSKeyUpMask
> >             | NSAlphaShiftKeyMask
> >             | NSShiftKeyMask
> >             | NSControlKeyMask
> >             | NSAlternateKeyMask
> >             | NSCommandKeyMask
> >             | NSNumericPadKeyMask
> >             | NSHelpKeyMask
> >             | NSFunctionKeyMask
> >             | NSFlagsChangedMask, self.handleEvent)
> >
> >     def handleEvent(self, event):
> >         # NSLog(u"%@", event)
> >
> >     def stop(self):
> >         NSEvent.removeMonitor_(self._observer)
> >
> > It is strange that each time when I exit the application, the following
> error printed in console:
> >
> > objc[8775]: autorelease pool page 0x1009e0000 corrupted
> >   magic 0x1009ff00 0xc0000000 0x00000000 0x60000000
> >   pthread 0x7fff7e917180
> >
> > Also a system dialog shown (please see the screenshot attached).
> >
> > Anyone encountered this before? Much appreciate for any suggestions/help.
>
> (I'm sorry if this arrives twice, I just noticed that an earlier attempt
> at replying seems to be dropped to the floor by mail.app...)
>
> Do you have a self-contained program that demonstrates the problem? I can
> get callbacks to handleEvent by embedding the code above
> in a small app, but the app doesn't crash in the way you mention.
>
> Ronald
>
> >
> > Thanks,
> > Jake
> >
> >
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