[maemo-developers] N950 SEGFAULT - help?

[From: Eero Tamminen]

Hi,

On 11/06/2011 01:03 AM, ext Nicolai Hess wrote:
> 2011/11/5 Felipe Crochik<felipe at crochik.com>
>
>> Unfortunately It didn't do the trick.... I can't tell any difference
>> ...still crashes with the QPainter::save()....
>>
>> Please let me know if any of you have any more ideas... I will play a
>> little more tomorrow.

Note that in general GL context should be dropped in applications
when they aren't visible. Main exception for this rule are plain GL
games because they cannot do this easily and user isn't typically
running many such games at the same time, like could be the case
with normal apps.

This is because GL contexts are severely limited resource and after
system runs out of them, any new processes just abort/crash on startup
because GL init fails.

Dropping GL context on background should happen automatically for
most MeegoTouch and QML applications.  If you're directly using GL
operations in such applications without taking this account, and
e.g. trying to do GL drawing in the background, funny things may
happen.


	- Eero

>>
>> Felipe
>>
>>
>> 2011/11/5 Kristóf Timur<timur at sch.bme.hu>
>>
>>>    That’s not how it’s done.
>>>
>>> 1. In your .pro file, add:
>>> QT += opengl
>>>
>>> 2. at the top of your cpp, add:
>>> #include<QGLWidget>
>>>
>>> 3. when you initialize your QDeclarativeView:
>>> QGLWidget glWidget;
>>> QDeclarativeView view;
>>> view.setViewport(&glWidget);
>>>
>>> Cheers,
>>> Timur
>>>
>>>   *From:* Felipe Crochik<felipe at crochik.com>
>>> *Sent:* Saturday, November 05, 2011 11:26 PM
>>> *To:* nicolaihess at web.de
>>> *Cc:* maemo-developers<maemo-developers at maemo.org>
>>> *Subject:* Re: N950 SEGFAULT - help?
>>>
>>> Nicolai,
>>>
>>> I tried the application using (I assume that is what you meant):
>>> QApplication::setGraphicsSystem("opengl");
>>>
>>> and haven't been able to crash the application but it gets really slow
>>> and unresponsive. Also I get these error messages on my log:
>>>
>>> Valid eglHandle received but not running with meego compatible
>>> graphicssystem.
>>>
>>> Any ideas?
>>>
>>> Thanks,
>>> Felipe
>>>
>>>
>>>
>>> 2011/10/7 Nicolai Hess<nicolaihess at web.de>
>>>
>>>> Have you tried to use a QGLWidget for the qmlviewer ?
>>>> This works for the QML Camera element which has the
>>>> same behavior, segfaults when application moved to background.
>>>>
>>>>
>>>> 2011/10/7 Felipe Crochik<felipe at crochik.com>
>>>>
>>>>> That is the "next" problem. They are not available - maybe I need to
>>>>> add some extra repository? sorry if I missed some obvious "development"
>>>>> required step.... It is hard to start over!
>>>>>
>>>>>
>>>>> 2011/10/7 Daniil Ivanov<daniil.ivanov at gmail.com>
>>>>>
>>>>>> apt-get install libqtwebkit4-dbg
>>>>>> or
>>>>>> apt-get install libqt4-webkit-dbg.
>>>>>>
>>>>>> 2011/10/7 Ивайло Димитров<freemangordon at abv.bg>:
>>>>>>   >  Why not install Qt debug symbols on the device and run/attach to
>>>>>> your
>>>>>>> program there under gdb?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> -------- Оригинално писмо --------
>>>>>>> От: Felipe Crochik
>>>>>>> Относно: N950 SEGFAULT - help?
>>>>>>> До: maemo-developers at maemo.org
>>>>>>> Изпратено на: Петък, 2011, Октомври 7 05:20:55 EEST
>>>>>>> I hit a wall with my application so I am looking for someone to help
>>>>>>> everywhere I can.
>>>>>>>
>>>>>>> The short version: how can I get qt creator to debug my application
>>>>>> on the
>>>>>>> device. Right now I get CRC mismatch warnings for all libraries and
>>>>>> I assume
>>>>>>> this is what prevents me to see any trace information
>>>>>>>
>>>>>>> That is what I get when I start to debug:
>>>>>>> ...
>>>>>>> the debug information found in
>>>>>>>
>>>>>> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvrPVR2D_DRI2WSEGL_r125.so"
>>>>>>> does not match
>>>>>>>
>>>>>> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvrPVR2D_DRI2WSEGL.so"
>>>>>>> (CRC mismatch).
>>>>>>>
>>>>>>> the debug information found in
>>>>>>>
>>>>>> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvr2d_r125.so"
>>>>>>> does not match
>>>>>>>
>>>>>> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvr2d.so"
>>>>>>> (CRC mismatch).
>>>>>>>
>>>>>>> ...
>>>>>>>
>>>>>>> I assume I need to install "debug symbols/versions" for the qt
>>>>>> libraries on
>>>>>>> the device somehow. Am I right? How can I accomplish this?
>>>>>>>
>>>>>>> The long version:
>>>>>>>
>>>>>>> My applications uses qml\webview and everything works fine until I
>>>>>> swipe out
>>>>>>> of my application and then later come back to it. With one click or
>>>>>> two I
>>>>>>> get a segfault. This is all the information that I managed to get
>>>>>> running
>>>>>>> gdb on the device:
>>>>>>>
>>>>>>> (gdb) backtrace
>>>>>>> #0  0x42068924 in QPainter::save() () from /usr/lib/libQtGui.so.4
>>>>>>> #1  0x48ec294c in ?? () from /usr/lib/libQtWebKit.so.4
>>>>>>> #2  0x48ec294c in ?? () from /usr/lib/libQtWebKit.so.4
>>>>>>>
>>>>>>> Program received signal SIGSEGV, Segmentation fault.
>>>>>>>
>>>>>>> Any suggestions?
>>>>>>>
>>>>>>> Thanks in advance,
>>>>>>> Felipe
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> maemo-developers mailing list
>>>>>>> maemo-developers at maemo.org
>>>>>>> https://lists.maemo.org/mailman/listinfo/maemo-developers
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> maemo-developers mailing list
>>>>> maemo-developers at maemo.org
>>>>> https://lists.maemo.org/mailman/listinfo/maemo-developers
>>>>>
>>>>>
>>>>
>>>
>>>   ------------------------------
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>>> maemo-developers at maemo.org
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>>>
>>>
>>
>
> Can you give a link to your source.
>
> nicolai
>
>
>
>
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