Version:            (using KDE 4.3.1)
Compiler:          gcc version 4.4.1 [gcc-4_4-branch revision 150839] (SUSE Linux) 
OS:                Linux
Installed from:    openSUSE RPMs

I was writing an email and added an email address to a contact in the addressbook that had no email addresses. When I tried to select the new email address, kontact crashed with:

Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb65fc4dc in QString::operator=(QString const&) () from /usr/lib/libQtCore.so.4
#7  0xb0ed6a24 in RecipientsPicker::updateList (this=0x900e570) at /usr/src/debug/kdepim-4.3.1/kmail/recipientspicker.cpp:153
#8  0xb0ed92dd in RecipientsPicker::setRecipients (this=0x900e570, recipients=@0xbfa7ea18) at /usr/src/debug/kdepim-4.3.1/kmail/recipientspicker.cpp:559
#9  0xb0ecf622 in SideWidget::pickRecipient (this=0x9bc3958) at /usr/src/debug/kdepim-4.3.1/kmail/recipientseditor.cpp:851
#10 0xb0ed13ab in SideWidget::qt_metacall (this=0x9bc3958, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0xbfa7eb58) at /usr/src/debug/kdepim-4.3.1/build/kmail/recipientseditor.moc:498
#11 0xb66c1864 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#12 0xb66c1d41 in QMetaObject::activate(QObject*, QMetaObject const*, int, int, void**) () from /usr/lib/libQtCore.so.4
#13 0xb6205985 in QAbstractButton::clicked(bool) () from /usr/lib/libQtGui.so.4
#14 0xb5f1ddad in ?? () from /usr/lib/libQtGui.so.4
#15 0xb5f1faeb in ?? () from /usr/lib/libQtGui.so.4
#16 0xb5f1fd86 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb5bd1bac in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#18 0xb5f1dc40 in QAbstractButton::event(QEvent*) () from /usr/lib/libQtGui.so.4
#19 0xb5fcac83 in QPushButton::event(QEvent*) () from /usr/lib/libQtGui.so.4
#20 0xb5b7a8fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#21 0xb5b82bbb in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0xb6c9072d in KApplication::notify (this=0xbfa808c8, receiver=0x9596b10, event=0xbfa7f0d0) at /usr/src/debug/kdelibs-4.3.1/kdeui/kernel/kapplication.cpp:302
#23 0xb66ab32e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#24 0xb5b81bdc in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib/libQtGui.so.4
#25 0xb5bf280a in ?? () from /usr/lib/libQtGui.so.4
#26 0xb5bf1d7e in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#27 0xb5c1d639 in ?? () from /usr/lib/libQtGui.so.4
#28 0xb66a998d in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0xb66a9dd9 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0xb66ac270 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0xb5b7a774 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#32 0x0804c04f in main (argc=1, argv=0xbfa80bd4) at /usr/src/debug/kdepim-4.3.1/kontact/src/main.cpp:218