[PyQt] segfault creating an empty QGraphicsScene

[Russell Warren]

Was anyone able to reproduce this problem with the attached tiny test case?
This is a bit of a mystery and a bit of a deal breaker.  I really don't
understand what is causing the segfault.

The only next step I can think of doing here is to try and convert the
little test case to C++ to see if it is a Qt problem vs a PyQt problem.

Does anyone have any alternative suggestions?


On Fri, Sep 18, 2015 at 10:49 AM, Russell Warren <russ at perspexis.com> wrote:

> I'm creating a QGraphicsScene with the intent to render to a
> QQuickPaintedItem and I'm having segfault issues.
>
> I've stripped the problem down to a very small script pair and attached
> them.  Note that the QGraphicsScene.render() call is not even present since
> it didn't have anything to do with the segfault.
>
> The segfault happens on the creation of the QGraphicsScene.  Remove the
> line and the (bogus) application works.
>
> fwiw, even when you remove the line and it works, this program segfaults
> on me when I close the window.  I don't know why.  Also fwiw, at some point
> I did have similar code working and the QGraphicsScene was rendering
> properly to the QQuickPaintedItem.  I'm not sure what the difference is.
>
> My environment is Qt5.5.0 and PyQt 5.5,  Running on Debian 7.8 (wheezy)
> 64-bit.  This was also happening to me on Qt 5.4.1 and I upgraded in hopes
> of the problem disappearing.  It has also been confirmed to fail on Windows.
>
> Am I doing something wrong that is causing the segfaults, or is this a
> Qt/PyQt bug?
>
> Thanks,
> Russ
>
>


-- 
Russell Warren
Perspexis Technologies Inc.

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