Application: knetworkmanager (v0.9)
KDE Platform Version: 4.4.4 (KDE 4.4.4) "release 2"
Qt Version: 4.6.3
Operating System: Linux 2.6.34-12-default i686
Distribution: "openSUSE 11.3 (i586)"

-- Information about the crash:
I`m using knetworkmanager and already have a active internet connection (wireless).
Accesing Yast-Network Devices-Network Settings-Global Options-Uncheck Use IPv6-OK
Yast crash and network is not available anymore.
Restart knetworkmanager to have internet connections again.

The crash can be reproduced every time.

 -- Backtrace:
Application: KNetworkManager (knetworkmanager), signal: Segmentation fault
[KCrash Handler]
#6  0xb6efaf36 in QMetaObject::cast(QObject*) const () from /usr/lib/libQtCore.so.4
#7  0xb712e2c3 in qobject_cast<Knm::InterfaceConnection const*> (first=0x8172428, second=0x81543b0) at /usr/include/QtCore/qobject.h:468
#8  activatableLessThan (first=0x8172428, second=0x81543b0) at /usr/src/debug/networkmanagement/libs/service/sortedactivatablelist.cpp:185
#9  0xb712ed35 in QAlgorithmsPrivate::qSortHelper<QList<Knm::Activatable*>::iterator, Knm::Activatable*, bool (*)(Knm::Activatable const*, Knm::Activatable const*)> (start=..., end=..., 
    t=@0x81173e8, lessThan=0xb712e240 <activatableLessThan(Knm::Activatable const*, Knm::Activatable const*)>) at /usr/include/QtCore/qalgorithms.h:351
#10 0xb712eb93 in qSort<QList<Knm::Activatable*>::iterator, bool (*)(Knm::Activatable const*, Knm::Activatable const*)> (this=0x81268b0, activatable=0x8172428)
    at /usr/include/QtCore/qalgorithms.h:187
#11 SortedActivatableList::handleAdd (this=0x81268b0, activatable=0x8172428) at /usr/src/debug/networkmanagement/libs/service/sortedactivatablelist.cpp:96
#12 0xb711d2d4 in ActivatableList::notifyOnAddActivatable (this=0x8129178, activatable=0x8172428) at /usr/src/debug/networkmanagement/libs/service/activatablelist.cpp:99
#13 0xb711d353 in ActivatableList::addActivatable (this=0x8129178, activatable=0x8172428) at /usr/src/debug/networkmanagement/libs/service/activatablelist.cpp:83
#14 0xb7121226 in WirelessNetworkInterfaceActivatableProvider::handleAdd (this=0x813a7c8, addedConnection=0x814dad0)
    at /usr/src/debug/networkmanagement/libs/service/wirelessnetworkinterfaceactivatableprovider.cpp:143
#15 0xb711e9e9 in NetworkInterfaceActivatableProvider::init (this=0x813a7c8) at /usr/src/debug/networkmanagement/libs/service/networkinterfaceactivatableprovider.cpp:64
#16 0xb711ddcd in NetworkInterfaceMonitor::networkInterfaceAdded (this=0x8127df0, uni=...) at /usr/src/debug/networkmanagement/libs/service/networkinterfacemonitor.cpp:79
#17 0xb7118c65 in NetworkInterfaceMonitor::qt_metacall (this=0x8127df0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbfb097e8)
    at /usr/src/debug/networkmanagement/build/libs/service/moc_networkinterfacemonitor.cpp:75
#18 0xb6efaefd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#19 0xb6f09fe8 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#20 0xb70a1195 in Solid::Control::NetworkManager::Notifier::networkInterfaceAdded(QString const&) () from /usr/lib/libsolidcontrol.so.4
#21 0xb70a17cc in ?? () from /usr/lib/libsolidcontrol.so.4
#22 0xb70a184e in ?? () from /usr/lib/libsolidcontrol.so.4
#23 0xb6efaefd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#24 0xb6f09fe8 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#25 0xb3ca0135 in NMNetworkManager::networkInterfaceAdded(QString const&) () from /usr/lib/kde4/solid_networkmanager07.so
#26 0xb3ca572a in NMNetworkManager::deviceAdded(QDBusObjectPath const&) () from /usr/lib/kde4/solid_networkmanager07.so
#27 0xb3caff73 in NMNetworkManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/kde4/solid_networkmanager07.so
#28 0xb6efaefd in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#29 0xb6f09fe8 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#30 0xb3ca1745 in ?? () from /usr/lib/kde4/solid_networkmanager07.so
#31 0xb3caab7f in ?? () from /usr/lib/kde4/solid_networkmanager07.so
#32 0xb702fa37 in ?? () from /usr/lib/libQtDBus.so.4
#33 0xb703d536 in ?? () from /usr/lib/libQtDBus.so.4
#34 0xb6f0793f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#35 0xb6449c64 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#36 0xb6451bf7 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#37 0xb73c09d1 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#38 0xb6ef4e0e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#39 0xb6ef89b4 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#40 0xb6ef8b9c in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#41 0xb6f2083d in ?? () from /usr/lib/libQtCore.so.4
#42 0xb5bceb49 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#43 0xb5bcf350 in ?? () from /usr/lib/libglib-2.0.so.0
#44 0xb5bcf60e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#45 0xb6f20d4b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#46 0xb64fa19a in ?? () from /usr/lib/libQtGui.so.4
#47 0xb6ef411d in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#48 0xb6ef4319 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#49 0xb6ef8c70 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#50 0xb6447164 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#51 0x08054029 in _start ()

Reported using DrKonqi