QT4.2 corrupted double-linked list and QRadioButton existance

[mtrpoland]

So yo advise me to change the line:

iconv_t cd = createIconv_t(UTF16, 0);

iconv_t cd = createIconv_t(UTF16, 0);

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that is placed in some qt file
to

iconv_t cd = createIconv_t(UTF16, NULL);

iconv_t cd = createIconv_t(UTF16, NULL);

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??
Just don't get the idea why my actions that are actually a commonplace (initialization of two QRadioButton's and its usage) entail a problem I presented above.
It's quite bizarre.

[jacek]

Just don't get the idea why my actions that are actually a commonplace (initialization of two QRadioButton's and its usage) entail a problem I presented above.
It's quite bizarre.

Yes, it is. Can you reproduce that stack trace?

[mtrpoland]

What do you mean by "reproducing the stack trace" ?

[mtrpoland]

Guys, I strove to circumvent the issue by placing one checkbox instead of two radios. It's like an ufo... Now the program works but I get 'core dumped' after having exited the application. So I assume there is a problem with destruction...

(gdb) backtrace
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb720a770 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0xb720bef3 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0xb723fd0b in __fsetlocking () from /lib/tls/i686/cmov/libc.so.6
#4  0xb72478bd in mallopt () from /lib/tls/i686/cmov/libc.so.6
#5  0xb7247a44 in free () from /lib/tls/i686/cmov/libc.so.6
#6  0xb7536e5d in QHashData::freeNode (this=0x8112498, node=0x8124af8)
    at tools/qhash.cpp:132
#7  0xb7991abd in QHash<unsigned long, QWidget*>::remove (this=0x8108d30,
    akey=@0x812498c)
    at ../../include/QtCore/../../src/corelib/tools/qhash.h:450
#8  0xb7982eff in QWidgetPrivate::setWinId (this=0x8124950, id=0)
    at kernel/qwidget.cpp:1180
#9  0xb79b8dcc in QWidget::destroy (this=0x81248b8, destroyWindow=true,
    destroySubWindows=true) at kernel/qwidget_x11.cpp:782
#10 0xb798866c in ~QWidget (this=0x81248b8) at kernel/qwidget.cpp:1162
#11 0xb7bd7ef1 in ~QAbstractButton (this=0x81248b8)
    at widgets/qabstractbutton.cpp:572
#12 0xb7c846e5 in ~QToolButton (this=0x81248b8) at widgets/qtoolbutton.cpp:347
#13 0xb75d4ea1 in QObjectPrivate::deleteChildren (this=0x8123978)
    at kernel/qobject.cpp:1823
#14 0xb7988649 in ~QWidget (this=0x8123938) at kernel/qwidget.cpp:1158
#15 0xb7c7e844 in ~QToolBar (this=0x8123938) at widgets/qtoolbar.cpp:472
---Type <return> to continue, or q <return> to quit---
#16 0xb75d4ea1 in QObjectPrivate::deleteChildren (this=0x810b300)
    at kernel/qobject.cpp:1823
#17 0xb7988649 in ~QWidget (this=0xbf85ebf0) at kernel/qwidget.cpp:1158
#18 0xb7c30c21 in ~QMainWindow (this=0xbf85ebf0) at widgets/qmainwindow.cpp:292
#19 0x080527ca in main ()

(gdb) backtrace
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb720a770 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0xb720bef3 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0xb723fd0b in __fsetlocking () from /lib/tls/i686/cmov/libc.so.6
#4  0xb72478bd in mallopt () from /lib/tls/i686/cmov/libc.so.6
#5  0xb7247a44 in free () from /lib/tls/i686/cmov/libc.so.6
#6  0xb7536e5d in QHashData::freeNode (this=0x8112498, node=0x8124af8)
    at tools/qhash.cpp:132
#7  0xb7991abd in QHash<unsigned long, QWidget*>::remove (this=0x8108d30,
    akey=@0x812498c)
    at ../../include/QtCore/../../src/corelib/tools/qhash.h:450
#8  0xb7982eff in QWidgetPrivate::setWinId (this=0x8124950, id=0)
    at kernel/qwidget.cpp:1180
#9  0xb79b8dcc in QWidget::destroy (this=0x81248b8, destroyWindow=true,
    destroySubWindows=true) at kernel/qwidget_x11.cpp:782
#10 0xb798866c in ~QWidget (this=0x81248b8) at kernel/qwidget.cpp:1162
#11 0xb7bd7ef1 in ~QAbstractButton (this=0x81248b8)
    at widgets/qabstractbutton.cpp:572
#12 0xb7c846e5 in ~QToolButton (this=0x81248b8) at widgets/qtoolbutton.cpp:347
#13 0xb75d4ea1 in QObjectPrivate::deleteChildren (this=0x8123978)
    at kernel/qobject.cpp:1823
#14 0xb7988649 in ~QWidget (this=0x8123938) at kernel/qwidget.cpp:1158
#15 0xb7c7e844 in ~QToolBar (this=0x8123938) at widgets/qtoolbar.cpp:472
---Type <return> to continue, or q <return> to quit---
#16 0xb75d4ea1 in QObjectPrivate::deleteChildren (this=0x810b300)
    at kernel/qobject.cpp:1823
#17 0xb7988649 in ~QWidget (this=0xbf85ebf0) at kernel/qwidget.cpp:1158
#18 0xb7c30c21 in ~QMainWindow (this=0xbf85ebf0) at widgets/qmainwindow.cpp:292
#19 0x080527ca in main ()

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The code was altered in mymvc.h:

QGridLayout* qvb;
	QLabel* label;
	QCheckBox* checkOne;
	bool caseSensitive;
};
 
#endif

QGridLayout* qvb;
	QLabel* label;
	QCheckBox* checkOne;
	bool caseSensitive;
};

#endif

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and in mymvc.cpp:

label = new QLabel(tr("Enter a character string below"));
checkOne = new QCheckBox(tr("Case Sensitive"));
checkOne->setChecked(true);
caseSensitive = true;
qvb = new QGridLayout();
	connect(checkOne,SIGNAL(toggled(bool)),this,SLOT(setCaseSensitive(bool)));
connect(qcb,SIGNAL(currentIndexChanged(int)),le,SLOT(clear()));
connect(qcb,SIGNAL(currentIndexChanged(int)),qtv,SLOT(filter()));
connect(le,SIGNAL(textChanged(const QString &)),qtv,SLOT(filter()));
   connect(model,SIGNAL(fromTVtoVM(int)),this,SIGNAL(doubleClickInTreeView(int)));
 
qvb->addWidget(label,0,0,1,2);
qvb->addWidget(le,1,0);
qvb->addWidget(checkOne,1,1);
qvb->addWidget(qcb,2,0,1,2);
qvb->addWidget(qtv,3,0,1,2);
   setLayout(qvb);

label = new QLabel(tr("Enter a character string below"));
checkOne = new QCheckBox(tr("Case Sensitive"));
checkOne->setChecked(true);
caseSensitive = true;
qvb = new QGridLayout();
	connect(checkOne,SIGNAL(toggled(bool)),this,SLOT(setCaseSensitive(bool)));
connect(qcb,SIGNAL(currentIndexChanged(int)),le,SLOT(clear()));
connect(qcb,SIGNAL(currentIndexChanged(int)),qtv,SLOT(filter()));
connect(le,SIGNAL(textChanged(const QString &)),qtv,SLOT(filter()));
   connect(model,SIGNAL(fromTVtoVM(int)),this,SIGNAL(doubleClickInTreeView(int)));

qvb->addWidget(label,0,0,1,2);
qvb->addWidget(le,1,0);
qvb->addWidget(checkOne,1,1);
qvb->addWidget(qcb,2,0,1,2);
qvb->addWidget(qtv,3,0,1,2);
   setLayout(qvb);

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[jacek]

What do you mean by "reproducing the stack trace" ?

Try running your application again and see whether the stack trace is the same.