Application: kontact (4.4.1)
KDE Platform Version: 4.4.1 (KDE 4.4.1)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
After launching kontact, I was in kmail settings and the crash occured when in the misc section I clicked on the browse button for selecting the default folder to display at launch of the app

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007fdf9c20f31f in qobject_cast<QTreeModel*> (this=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:455
#6  QTreeWidgetPrivate::treeModel (this=<value optimized out>) at ../../include/QtGui/private/../../../src/gui/itemviews/qtreewidget_p.h:222
#7  QTreeWidget::topLevelItemCount (this=<value optimized out>) at itemviews/qtreewidget.cpp:2608
#8  0x00007fdf8497f074 in KMail::FolderSelectionTreeWidget::reload (this=0x253c800, mustBeReadWrite=<value optimized out>, showOutbox=<value optimized out>, showImapFolders=<value optimized out>, 
    preSelection=...) at /home/phil/kdemod/core/kdepim/src/kdepim-4.4.1/kmail/folderselectiontreewidget.cpp:177
#9  0x00007fdf849800cf in KMail::FolderSelectionDialog::init (this=0x2598f50, tree=<value optimized out>, mustBeReadWrite=255)
    at /home/phil/kdemod/core/kdepim/src/kdepim-4.4.1/kmail/folderselectiondialog.cpp:70
#10 0x00007fdf8498038e in FolderSelectionDialog (this=0x2598f50, parent=<value optimized out>, tree=0x1827f90, caption=..., mustBeReadWrite=128, useGlobalSettings=false)
    at /home/phil/kdemod/core/kdepim/src/kdepim-4.4.1/kmail/folderselectiondialog.cpp:53
#11 0x00007fdf84ba9f99 in KMail::FolderRequester::slotOpenDialog (this=0x2a58be0) at /home/phil/kdemod/core/kdepim/src/kdepim-4.4.1/kmail/folderrequester.cpp:83
#12 0x00007fdf84baa111 in KMail::FolderRequester::qt_metacall (this=0x2a58be0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdbbbd680)
    at /home/phil/kdemod/core/kdepim/src/kdepim-4.4.1/kmail/folderrequester.moc:77
#13 0x00007fdf9c8ca95f in QMetaObject::activate (sender=0x2a59f80, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3293
#14 0x00007fdf9c30d5e2 in QAbstractButton::clicked (this=0x7fdf9c73d780, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:206
#15 0x00007fdf9c0278eb in QAbstractButtonPrivate::emitClicked (this=0x2a5ad90) at widgets/qabstractbutton.cpp:546
#16 0x00007fdf9c0287ab in QAbstractButtonPrivate::click (this=0x2a5ad90) at widgets/qabstractbutton.cpp:539
#17 0x00007fdf9c028a1c in QAbstractButton::mouseReleaseEvent (this=0x2a59f80, e=0x7fffdbbbe160) at widgets/qabstractbutton.cpp:1121
#18 0x00007fdf9c0f4b2a in QToolButton::mouseReleaseEvent (this=0x7fdf9c73d780, e=0xffffffff) at widgets/qtoolbutton.cpp:721
#19 0x00007fdf9bccacf2 in QWidget::event (this=0x2a59f80, event=0x7fffdbbbe160) at kernel/qwidget.cpp:7998
#20 0x00007fdf9bc7495c in QApplicationPrivate::notify_helper (this=0x15f8510, receiver=0x2a59f80, e=0x7fffdbbbe160) at kernel/qapplication.cpp:4300
#21 0x00007fdf9bc7b72b in QApplication::notify (this=0x7fffdbbbecc0, receiver=0x2a59f80, e=0x7fffdbbbe160) at kernel/qapplication.cpp:3865
#22 0x00007fdf9d2a0d96 in KApplication::notify (this=0x7fffdbbbecc0, receiver=0x2a59f80, event=0x7fffdbbbe160) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.4.1/kdeui/kernel/kapplication.cpp:302
#23 0x00007fdf9c8b7bfc in QCoreApplication::notifyInternal (this=0x7fffdbbbecc0, receiver=0x2a59f80, event=0x7fffdbbbe160) at kernel/qcoreapplication.cpp:704
#24 0x00007fdf9bc7a8fe in QCoreApplication::sendEvent (receiver=0x2a59f80, event=0x7fffdbbbe160, alienWidget=0x2a59f80, nativeWidget=0x16b59b0, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>, spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#25 QApplicationPrivate::sendMouseEvent (receiver=0x2a59f80, event=0x7fffdbbbe160, alienWidget=0x2a59f80, nativeWidget=0x16b59b0, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>, spontaneous=true) at kernel/qapplication.cpp:2965
#26 0x00007fdf9bcfa2eb in QETWidget::translateMouseEvent (this=0x16b59b0, event=<value optimized out>) at kernel/qapplication_x11.cpp:4368
#27 0x00007fdf9bcf8ffa in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffdbbbe8e0) at kernel/qapplication_x11.cpp:3501
#28 0x00007fdf9bd23712 in x11EventSourceDispatch (s=0x15fccd0, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007fdf9407f2be in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007fdf94082c78 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#31 0x00007fdf94082da0 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007fdf9c8e1093 in QEventDispatcherGlib::processEvents (this=0x15a96a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#33 0x00007fdf9bd2330e in QGuiEventDispatcherGlib::processEvents (this=0x7fdf9c73d780, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#34 0x00007fdf9c8b6522 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#35 0x00007fdf9c8b68fc in QEventLoop::exec (this=0x7fffdbbbec00, flags=) at kernel/qeventloop.cpp:201
#36 0x00007fdf9c8ba63b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#37 0x0000000000403e6e in main (argc=<value optimized out>, argv=<value optimized out>) at /home/phil/kdemod/core/kdepim/src/kdepim-4.4.1/kontact/src/main.cpp:224

Reported using DrKonqi