[Qt-interest] strange EXC_BAD_ACCESS crash only on Mac

[Oliver Demetz]

Howdie!

Updated information:
When writing this post I was still using the Carbon version of the Qt
libs (4.5.3).
Now I switched to the Cocoa version, AND I DO NOT GET THIS CRASH NOW
ANYMORE!!!

So, this bug (is it one?) just exists in the Carbon version!!!

I am sorry, but I cannot so easily find out what exactly triggers this
crash, just opening a window and closing it is not enough.

My widget the is closed contains an opengl-driven QGraphicsView (but its
functionality is fine and correct).

Regards,
Oliver


Oliver Demetz schrieb:
> Hi,
> I have developed a meanwhile quite stable app on Windows.
> There it runs fine and I don't know of any crash.
> Now I ported to Mac, getting the following program crash:
> 
> gdb output:
> 
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: KERN_PROTECTION_FAILURE at address: 0x00000104
> 0x00a05cf6 in QApplication::restoreOverrideCursor ()
> (gdb) backtrace
> #0  0x00a05cf6 in QApplication::restoreOverrideCursor ()
> #1  0x00a1868e in QWidgetPrivate::qt_widget_event ()
> #2  0x970fd13d in DispatchEventToHandlers ()
> #3  0x970fc57b in SendEventToEventTargetInternal ()
> #4  0x970fc3e0 in SendEventToEventTargetWithOptions ()
> #5  0x9711fded in HIView::SendDraw ()
> #6  0x9711f8c6 in HIView::RecursiveDrawComposited ()
> #7  0x9711fa2f in HIView::RecursiveDrawComposited ()
> #8  0x9711fa2f in HIView::RecursiveDrawComposited ()
> #9  0x9711eccc in HIView::DrawComposited ()
> #10 0x9711e9df in HIView::Draw ()
> #11 0x9711e92f in HIView::Render ()
> #12 0x97126d67 in FlushWindowObject ()
> #13 0x97129fac in _FlushWindow ()
> #14 0x971814c7 in PostActivateEvent ()
> #15 0x97180f17 in HiliteAndActivateWindow ()
> #16 0x973bee11 in AdjustToNewWindowActivation ()
> #17 0x97182120 in PotentiallyAdjustToNewWindowActivation ()
> #18 0x9718206a in BringToFrontAndActivateWindow ()
> #19 0x97181f27 in WindowData::SelectWindow ()
> #20 0x00a16af3 in QWidget::activateWindow ()
> #21 0x00a0a11a in QApplicationPrivate::globalEventProcessor ()
> #22 0x970fd13d in DispatchEventToHandlers ()
> #23 0x970fc57b in SendEventToEventTargetInternal ()
> #24 0x970fc3e0 in SendEventToEventTargetWithOptions ()
> #25 0x9712ad54 in ToolboxEventDispatcherHandler ()
> #26 0x970fd4f6 in DispatchEventToHandlers ()
> #27 0x970fc57b in SendEventToEventTargetInternal ()
> #28 0x97118ecc in SendEventToEventTarget ()
> #29 0x00a1df94 in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
> #30 0x00544391 in QEventLoop::processEvents ()
> #31 0x0054455d in QEventLoop::exec ()
> #32 0x005482ce in QCoreApplication::exec ()
> #33 0x00071da1 in main (argc=2, argv=0xbffff8b0) at main.cpp:118
> 
> The error occurs after I close a window, but I don't know whether this 
> is relevant since there is no destructor or such involved in the 
> backtrace, and please keep in mind that the same code runs fine on windows.
> Ah, and these is also no difference between the debug and release build.
> 
> Thanks in advance,
> best regards,
> Olli
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