[Interest] Enc: Debian packaging problem

[hfsamb-cel at yahoo.com.br]

It has been a while but probably it was built with QtWebKit enabled.

At the time I was going to implement extensions to javascript language.



________________________________
 De: Konstantin Tokarev <annulen at yandex.ru>
Para: "hfsamb-cel at yahoo.com.br" <hfsamb-cel at yahoo.com.br>; "interest at qt-project.org" <interest at qt-project.org> 
Enviadas: Terça-feira, 6 de Agosto de 2013 11:00
Assunto: Re: [Interest] Enc:  Debian packaging problem
 


06.08.2013, 17:12, "hfsamb-cel at yahoo.com.br" <hfsamb-cel at yahoo.com.br>:
> Hi Thiago,
>
> I once tried to compile qt everywhere in debug mode but after some 6 hours it failed to compile due to lack of memory. I guess my PC is not powerful enough.
>
> Is there a pre-compiled version of Qt5 I can use?

Out of curiosity: did you build with QtWebKit enabled?

>
> Regards,
> Henrique
>
> ----- Mensagem encaminhada -----
> De: Thiago Macieira <thiago.macieira at intel.com>
> Para: interest at qt-project.org
> Enviadas: Segunda-feira, 5 de Agosto de 2013 13:02
> Assunto: Re: [Interest] Debian packaging problem
>
> On segunda-feira, 5 de agosto de 2013 06:34:33, hfsamb-cel at yahoo.com.br wrote:
>> Hello,
>>
>> I built a Qt5.0.2 application on one machine and packaged it as a deb file.
>> This application consists basically of one libVLC widget alone in a frame
>> and one QWebView widget in another frame. I need that the QWebView is
>> transparent on top of the video. I can achieve that using two separate
>> frames in a compositing window manager like Compiz in Ubuntu 12.04.
>>
>> When I run this application in another machine I have a realloc error inside
>> Qt when calling libVLC init function. If I compile the source code in this
>> machine I have no error at all. This application is meant to be distributed
>> as debian package.
>>
>> Please see below the log error and a valgrind log as attachment. Any help is
>> appreciated.
>
> Looks like it Qt tried to reallocate the shared_null in QListData:
> ==2449== Invalid free() / delete / delete[] / realloc()
> ==2449==    at 0x402BF52: realloc (in /usr/lib/valgrind/vgpreload_memcheck-
> x86-linux.so)
> ==2449==    by 0x69B6656: QListData::realloc(int) (in
> /opt/Qt5.0.2/5.0.2/gcc/lib/libQt5Core.so.5.0.2)
> ==2449==    by 0x69B673B: QListData::append(int) (in
> /opt/Qt5.0.2/5.0.2/gcc/lib/libQt5Core.so.5.0.2)
> ==2449==    by 0x69B67C2: QListData::append() (in
> /opt/Qt5.0.2/5.0.2/gcc/lib/libQt5Core.so.5.0.2)
> ==2449==    by 0x697BBB7: ??? (in
> /opt/Qt5.0.2/5.0.2/gcc/lib/libQt5Core.so5.0.2)
> ==2449==  Address 0x6d4dd1c is 0 bytes inside data symbol
> "_ZN9QListData11shared_nullE"
>
> Looking at the source code for QListData::append(int), it has this at the
> beginning:
>     Q_ASSERT(d->ref == 1);
>
> Now, your Qt is compiled in release mode, which means the assertion isn't
> there. We have two possibitilies:
>
> 1) d->ref != 1, and the bug is in a caller
> 2) d->ref == 1 and somehow you managed to trigger a bug in 8-year-old code
>
> Turns out that the second case is more likely, because the shared_null is
> initialised to refcount 1. It's extremely unlikely, but it can happen. I'll
> try to reproduce this.
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
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-- 
Regards,
Konstantin
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