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List:       kde-core-devel
Subject:    Re: KURLLabel segfaults with Qt-2.0.1
From:       Kurt Granroth <kurt_granroth () email ! mot ! com>
Date:       1999-08-03 18:26:22
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Cristian Tibirna wrote:
> While helping Lotzi Boloni to test gofai (the neat new app in kdenonbeta)
> we discovered that KURLLabel segfaults with Qt-2.0.1.
> 
> This happens in kurllabel.cpp around line 159. It seems to me the font()
> call never returns a good font value. Thus, either the setUnderline or
> setFont below are entering into some sort of long loop then segfault.
> 
> We weren't able to test this more, because I don't have qt/kde compiled
> with debug symbols these days.
> 
> Anyways, Lotzi ran KURLLabel with Qt-2.0 and all is ok. So, it's probably
> a Qt-2.0.1 problem.

I'll take a look at this tonight.  I wonder if it is related to this?

>From: John Corey <whoop@mtco.com>
>Subject: kcontrol
>To: KDE Devel <kde-devel@kde.org>
> 
>This morning I was trying to figure out just why kcontrol insists on
>segfaulting here when doing something so simple as setting the font.
>Below is a backtrace.  It seems to get confused at #2, where it gets
>confused, and "this" is an unacceptable value.  From there it just goes
>downhill, finally trying to copy 203MB of data into there.
> 
>Obviously, other programs are able to set the font just fine doing the
>same things KControl is trying to do, so I don't think it's in
>necessarily in Qt that it blows up.  I do have the "times" font family.
>Does anyone else have trouble with kcontrol?
> 
>(gdb) bt
>#0  0x408138a7 in memcpy (dstpp=0x408e6008, srcpp=0x6050606,
>len=203033626)
>    at ../sysdeps/generic/memcpy.c:55
>#1  0x403be32a in QString::setLength (this=0xbffff480, newLen=101516813)
>    at tools/qstring.cpp:10706
>#2  0x403bdf96 in QString::real_detach (this=0xbffff480) at
>tools/qstring.cpp:10560
>#3  0x403c09c1 in QString::lower (this=0x80a031c) at
>tools/qstring.cpp:11499
>#4  0x403e1dd2 in QFont::key (this=0x80a00c8) at kernel/qfont.cpp:1208
>#5  0x403666b2 in QFont::load (this=0x80a00c8) at
>kernel/qfont_x11.cpp:724
>#6  0x40365426 in QFont::handle (this=0x80a00c8) at
>kernel/qfont_x11.cpp:395
>#7  0x404357d6 in QWidget::setFont (this=0x80a0060, font=@0xbffff5b8)
>    at kernel/qwidget.cpp:1928
>#8  0x80534d3 in mainWidget::mainWidget (this=0x809fc60,
>parent=0x808acb0, name=0x0)
>    at mainwidget.cpp:28

-- 
Kurt Granroth            | granroth@kde.org
KDE Developer/Evangelist | http://www.pobox.com/~kurt_granroth
         KDE -- Putting a Friendly Face on Linux

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