Mailing List Archive: QML WebView segfaults when user goes to task switcher

QML WebView segfaults when user goes to task switcher

Mar 31, 2012, 9:17 PM

Post #1 of 3 (1435 views)

I have reported similar problem before but have never figured out a
solution for it. Hopefully I will have better luck this time - I have two
applications waiting for a workaround so I can release them to the
Harmattan platform.

The application will crash with segfault if the javascript tries to update
the screen when (or after) the user switches to the task switcher on
harmattan. This is the output:
Meego graphics system destroyed

QPaintDevice: Cannot destroy paint device that is being painted

Segmentation fault

Finished running remote process. Exit code was 139.

I have now a very simple example that reproduce the issue 100% of the time.
I can't report this to the harmattan bug web site anymore so I am posting
to any and all channels were I can find someone with expertise to help me.

In order to avoid a long e-mail with attached files I created a simple web
page with more information: http://crochik.com/webview/

Thanks in advance,
Felipe

Re: QML WebView segfaults when user goes to task switcher [ In reply to ]

mohammed.2.hassan at nokia

Apr 5, 2012, 6:48 AM

Post #2 of 3 (1391 views)

Permalink

On Sun, 2012-04-01 at 00:17 -0400, ext Felipe Crochik wrote:
> I have reported similar problem before but have never figured out a
> solution for it. Hopefully I will have better luck this time - I have
> two applications waiting for a workaround so I can release them to the
> Harmattan platform.
>
> The application will crash with segfault if the javascript tries to
> update the screen when (or after) the user switches to the task
> switcher on harmattan. This is the output:
> Meego graphics system destroyed
>
> QPaintDevice: Cannot destroy paint device that is being painted
>
> Segmentation fault
>
> Finished running remote process. Exit code was 139.
>
>
> I have now a very simple example that reproduce the issue 100% of the
> time.
> I can't report this to the harmattan bug web site anymore so I am
> posting to any and all channels were I can find someone with expertise
> to help me.
>
> In order to avoid a long e-mail with attached files I created a simple
> web page with more information: http://crochik.com/webview/

Have you tried setting the viewport for QDeclarativeView to QGLWidget ?

QmlApplicationViewer viewer;

viewer.setViewport(new QGLWidget);

Seeing a backtrace would probably help finding a better workaround.

Cheers,

--
Senior Software Engineer
Maemo Software

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Re: QML WebView segfaults when user goes to task switcher [ In reply to ]

felipe at crochik

Apr 6, 2012, 4:38 AM

Post #3 of 3 (1392 views)

Permalink

Mohammed,

It is funny.... I just tried with the example code I published and now it
does not crash anymore. I had tried before on a different application
(with my custom version of the webview component) and it didn't do any good
then.
I will double check applying this change to my two applications that depend
on it and let you know of the results.

Thank you very much for now!
Felipe

On Thu, Apr 5, 2012 at 9:48 AM, Mohammed Hassan <mohammed.2.hassan@nokia.com
> wrote:

> On Sun, 2012-04-01 at 00:17 -0400, ext Felipe Crochik wrote:
> > I have reported similar problem before but have never figured out a
> > solution for it. Hopefully I will have better luck this time - I have
> > two applications waiting for a workaround so I can release them to the
> > Harmattan platform.
> >
> > The application will crash with segfault if the javascript tries to
> > update the screen when (or after) the user switches to the task
> > switcher on harmattan. This is the output:
> > Meego graphics system destroyed
> >
> > QPaintDevice: Cannot destroy paint device that is being painted
> >
> > Segmentation fault
> >
> > Finished running remote process. Exit code was 139.
> >
> >
> > I have now a very simple example that reproduce the issue 100% of the
> > time.
> > I can't report this to the harmattan bug web site anymore so I am
> > posting to any and all channels were I can find someone with expertise
> > to help me.
> >
> > In order to avoid a long e-mail with attached files I created a simple
> > web page with more information: http://crochik.com/webview/
>
> Have you tried setting the viewport for QDeclarativeView to QGLWidget ?
>
> QmlApplicationViewer viewer;
>
> viewer.setViewport(new QGLWidget);
>
> Seeing a backtrace would probably help finding a better workaround.
>
> Cheers,
>
> --
> Senior Software Engineer
> Maemo Software
>
>