Arabic issue #18: app.setFont(QFont("")) causes a run-time crash!

[Munzir Taha]

# uname -a
Linux localhost 2.6.10-1mdk #1 Fri Jan 14 14:31:03 CET 2005 i686 AMD 
Athlon(tm) 64 Processor 3200+ unknown GNU/Linux

CODE: 

#include <QtGui>

int main(int argc, char *argv[])
{
        QApplication app(argc, argv);
        app.setFont(QFont(""));

        QHBoxWidget *hbox = new QHBoxWidget(0);
        QSpinBox *spinBox = new QSpinBox(hbox);

        spinBox->setValue(35);
        hbox->show();
        return app.exec();


}


PROBLEM:
A run-time crash with this message:
ASSERT: "(next == length && gp == current.num_glyphs) || logClusters[next] ==

gp" in file /usr/local/qt/src/gui/text/qtextlayout.cpp, line 1146
Aborted (core dumped)

A core file attached!

-- 
Munzir Taha  PGP Key available
gpg --recv-keys --keyserver www.mandrakesecure.net F0671821

Telecommunications and Electronics Engineer
Mandrake Club Member
Maintainer of the OpenBugs Wiki page at
http://arabic-fedora.org/
Maintainer of Fedora Arabic Translation Project
https://listman.redhat.com/mailman/listinfo/fedora-trans-ar
CIW Designer, ICDL, MOUS, Linux+, LPI 101
New Horizons CLC, Riyadh, SA

[Munzir Taha]

On Yaum al-Khamees 15 Muharram 1426 13:18, Munzir Taha wrote:

>          app.setFont(QFont(""));
>
>          QHBoxWidget *hbox = new QHBoxWidget(0);
>          QSpinBox *spinBox = new QSpinBox(hbox);
>
>          spinBox->setValue(35);
>          hbox->show(); 
>  PROBLEM:
>  A run-time crash with this message:
>  ASSERT: "(next == length && gp == current.num_glyphs) || logClusters[next]
>  == gp" in file /usr/local/qt/src/gui/text/qtextlayout.cpp, line 1146
>  Aborted (core dumped) 
Lars, have you been able to reproduce/solve this? If not, I will try to come 
with something more concrete than QFont(""). Just drop me a note.

-- 
Munzir Taha  PGP Key available
gpg --recv-keys --keyserver www.mandrakesecure.net F0671821

Telecommunications and Electronics Engineer
Mandrake Club Member
Maintainer of the OpenBugs Wiki page at
http://arabic-fedora.org/
Maintainer of Fedora Arabic Translation Project
https://listman.redhat.com/mailman/listinfo/fedora-trans-ar
CIW Designer, ICDL, MOUS, Linux+, LPI 101
New Horizons CLC, Riyadh, SA

[Munzir Taha]

On Thursday 10 March 2005 07:33, Munzir Taha wrote:
>  On Yaum al-Khamees 15 Muharram 1426 13:18, Munzir Taha wrote:
>  >         app.setFont(QFont(""));
>  >
>  >         QHBoxWidget *hbox = new QHBoxWidget(0);
>  >         QSpinBox *spinBox = new QSpinBox(hbox);
>  >
>  >         spinBox->setValue(35);
>  >         hbox->show();
>  >
>  > PROBLEM:
>  > A run-time crash with this message:
>  > ASSERT: "(next == length && gp == current.num_glyphs) ||
>  > logClusters[next] == gp" in file
>  > /usr/local/qt/src/gui/text/qtextlayout.cpp, line 1146 Aborted (core
>  > dumped)
>
>  Lars, have you been able to reproduce/solve this? If not, I will try to
>  come with something more concrete than QFont(""). Just drop me a note. 
This is still reproducable with Qt 4.0.0-b2-snapshot-20050318 as

ASSERT: "(next == length && gp == current.num_glyphs) || logClusters[next] ==

gp" in file /usr/local/qt-sync/src/gui/text/qtextlayout.cpp, line 1121

I managed now to reproduce it with QFont("anygarbage"), so for some reason 
QFont didn't recognize some fonts passed which indicates two bugs. Bug 1: why 
not recognized? Bug 2: Even though why not falling back to the default 
application font instead of the crash? I can send/post one of those fonts 
that are not recognized if wanted.

-- 
Munzir Taha  PGP Key available
gpg --recv-keys --keyserver www.mandrakesecure.net F0671821

Telecommunications and Electronics Engineer
Mandrake Club Member
Maintainer of the OpenBugs project page at
http://www.arabic-fedora.org/munzir/OpenBugs.html
Maintainer of Fedora Arabic Translation Project
https://listman.redhat.com/mailman/listinfo/fedora-trans-ar
CIW Designer, ICDL, MOUS, Linux+, LPI 101
New Horizons CLC, Riyadh, SA

[Munzir Taha]

On Yaum al-Arbi'a 19 Safar 1426 03:28, Munzir Taha wrote:
>  On Thursday 10 March 2005 07:33, Munzir Taha wrote:
>  > On Yaum al-Khamees 15 Muharram 1426 13:18, Munzir Taha wrote: 
>  > > PROBLEM:
>  > > A run-time crash with this message:
>  > > ASSERT: "(next == length && gp == current.num_glyphs) ||
>  > > logClusters[next] == gp" in file
>  > > /usr/local/qt/src/gui/text/qtextlayout.cpp, line 1146 Aborted (core
>  > > dumped)
>  >
>  > Lars, have you been able to reproduce/solve this? If not, I will try to
>  > come with something more concrete than QFont(""). Just drop me a note.
>
>  This is still reproducable with Qt 4.0.0-b2-snapshot-20050318 as 
This is still reproducable with Qt 4.0.0-rc1-snapshot-20050417
and this code:

        QApplication::setFont(QFont("", 60));
        QTextEdit *text = new QTextEdit(trUtf8("عربي"));
        text->show();


>  ASSERT: "(next == length && gp == current.num_glyphs) ||
> logClusters[next]
>  == gp" in file /usr/local/qt-sync/src/gui/text/qtextlayout.cpp, line 1121
>
>  I managed now to reproduce it with QFont("anygarbage"), so for some reason
>  QFont didn't recognize some fonts passed which indicates two bugs. Bug 1:
>  why not recognized? Bug 2: Even though why not falling back to the default
>  application font instead of the crash? I can send/post one of those fonts
>  that are not recognized if wanted. 
The bt is something like this:

#6  0xb7eb0782 in qt_message_output (msgType=QtFatalMsg,
    buf=0xbfffcaf0 "ASSERT: \"(next == length && gp ==
current.num_glyphs) || 
logClusters[next] == gp\" in file text/qtextlayout.cpp, line 1121") at 
global/qglobal.cpp:572
#7  0xb7eb0be1 in qFatal (msg=0xb7f82d00 "ASSERT: \"%s\" in file %s, line
%d") 
at global/qglobal.cpp:784
#8  0xb7eb0386 in qt_assert (
    assertion=0xb7d7d290 "(next == length && gp == current.num_glyphs) || 
logClusters[next] == gp",
    file=0xb7d7d210 "text/qtextlayout.cpp", line=1121) at 
global/qglobal.cpp:341


-- 
Munzir Taha  PGP Key available
gpg --recv-keys --keyserver www.mandrakesecure.net F0671821

Telecommunications and Electronics Engineer
Mandrake Club Member
Maintainer of the OpenBugs project page at
http://www.arabic-fedora.org/munzir/OpenBugs.html
Maintainer of Fedora Arabic Translation Project
https://listman.redhat.com/mailman/listinfo/fedora-trans-ar
Master CIW Designer, ICDL, MOUS, Linux+, LPI 101
New Horizons CLC, Riyadh, SA