sorry, right output: http://paste.kde.org/p1nhnfg8u

#6  0x000000334c235c39 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#7  0x000000334c237348 in __GI_abort () at abort.c:89
#8  0x00007f6b0cc5553f in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1364
#9  0x00007f6b0cc53048 in QMessageLogger::fatal (this=0x7fff5637f5b0, msg=0x7f6b0cf5f3e0 "ASSERT: \"%s\" in file %s, line %d") at global/qlogging.cpp:669
#10 0x00007f6b0cc4d688 in qt_assert (assertion=0x7f6b0d00cd80 "priv(m->d.data)->revision >= 7", file=0x7f6b0d00cca4 "kernel/qmetaobject.cpp", line=640) at global/qglobal.cpp:2127
#11 0x00007f6b0ce90c60 in QMetaObject::indexOfMethod (this=0x3b9a817bc0 <PolkitQt1::Authority::staticMetaObject>, method=0x199b2d8 "dbusFilter(QDBusMessage)") at kernel/qmetaobject.cpp:640
#12 0x00007f6b0d87a394 in QDBusConnectionPrivate::findSlot (obj=0x1976410, normalizedName=..., params=...) at qdbusintegrator.cpp:1293
#13 0x00007f6b0d87a4dc in QDBusConnectionPrivate::prepareHook (hook=..., key=..., service=..., path=..., interface=..., name=..., argMatch=..., receiver=0x1976410, signal=0x3b9a61306e "1dbusFilter(QDBusMessage)", minMIdx=0, buildSignature=false) at qdbusintegrator.cpp:1313
#14 0x00007f6b0d87f9d8 in QDBusConnectionPrivate::connectSignal (this=0x199d590, service=..., path=..., interface=..., name=..., argumentMatch=..., signature=..., receiver=0x1976410, slot=0x3b9a61306e "1dbusFilter(QDBusMessage)") at qdbusintegrator.cpp:2139
#15 0x00007f6b0d86c5fe in QDBusConnection::connect (this=0x7fff5637fae0, service=..., path=..., interface=..., name=..., argumentMatch=..., signature=..., receiver=0x1976410, slot=0x3b9a61306e "1dbusFilter(QDBusMessage)") at qdbusconnection.cpp:712
#16 0x00007f6b0d86c21d in QDBusConnection::connect (this=0x7fff5637fae0, service=..., path=..., interface=..., name=..., receiver=0x1976410, slot=slot@entry=0x3b9a61306e "1dbusFilter(QDBusMessage)") at qdbusconnection.cpp:633
#17 0x0000003b9a60aa6e in PolkitQt1::Authority::Private::dbusSignalAdd (this=this@entry=0x1929f60, service=..., path=..., interface=..., name=...) at /usr/src/debug/polkit-qt-1-0.103.0/core/polkitqt1-authority.cpp:259
#18 0x0000003b9a60b4e1 in PolkitQt1::Authority::Private::init (this=0x1929f60) at /usr/src/debug/polkit-qt-1-0.103.0/core/polkitqt1-authority.cpp:208
#19 0x0000003b9a60bfca in PolkitQt1::Authority::Authority (this=0x1976410, authority=0x0, parent=<optimized out>) at /usr/src/debug/polkit-qt-1-0.103.0/core/polkitqt1-authority.cpp:153
#20 0x0000003b9a60c072 in PolkitQt1::Authority::instance (authority=0x0) at /usr/src/debug/polkit-qt-1-0.103.0/core/polkitqt1-authority.cpp:49
#21 0x00007f6af54fbc8c in KAuth::Polkit1Backend::Polkit1Backend (this=0x197b5c0) at /home/arjun/kde5-src/frameworks/kauth/src/backends/polkit-1/Polkit1Backend.cpp:68
#22 0x00007f6af54feadd in qt_plugin_instance () at /home/arjun/kde5-build/frameworks/kauth/src/moc_Polkit1Backend.cpp:192
#23 0x00007f6b0ce72c5d in QPluginLoader::instance (this=0x7fff5637fe80) at plugin/qpluginloader.cpp:200
#24 0x00007f6b0fe41b99 in KAuth::BackendsManager::retrieveInstancesIn (subdir=...) at /home/arjun/kde5-src/frameworks/kauth/src/BackendsManager.cpp:63
#25 0x00007f6b0fe41e59 in KAuth::BackendsManager::init () at /home/arjun/kde5-src/frameworks/kauth/src/BackendsManager.cpp:78
#26 0x00007f6b0fe421d4 in KAuth::BackendsManager::authBackend () at /home/arjun/kde5-src/frameworks/kauth/src/BackendsManager.cpp:120
#27 0x00007f6b0fe3c1c1 in KAuth::Action::setName (this=0x1929948, name=...) at /home/arjun/kde5-src/frameworks/kauth/src/kauthaction.cpp:119
#28 0x00007f6b0fe3bfb0 in KAuth::Action::Action (this=0x1929948, name=...) at /home/arjun/kde5-src/frameworks/kauth/src/kauthaction.cpp:70
#29 0x00007f6b102b78be in KCModulePrivate::KCModulePrivate (this=0x1929910) at /home/arjun/kde5-src/frameworks/kconfigwidgets/src/kcmodule.cpp:47
#30 0x00007f6b102b62c1 in KCModule::KCModule (this=0x19299b0, parent=0x1931ce0) at /home/arjun/kde5-src/frameworks/kconfigwidgets/src/kcmodule.cpp:78
#31 0x00007f6af68f5992 in KCMDesktopTheme::KCMDesktopTheme (this=0x19299b0, parent=0x1931ce0) at /home/arjun/kde5-src/kde/workspace/plasma-desktop/kcms/desktoptheme/kcmdesktoptheme.cpp:54
#32 0x00007f6af68fa2b2 in KPluginFactory::createInstance<KCMDesktopTheme, QWidget> (parentWidget=0x0, parent=0x1931ce0, args=...) at /home/arjun/kde/include/KF5/KCoreAddons/kpluginfactory.h:457
#33 0x00007f6b0d3a9192 in KPluginFactory::create (this=0x195cc90, iface=0x7f6b102ce168 <qt_meta_stringdata_KCModule+360> "KCModule", parentWidget=0x0, parent=0x1931ce0, args=..., keyword=...) at /home/arjun/kde5-src/frameworks/kcoreaddons/src/lib/plugin/kpluginfactory.cpp:145
#34 0x00007f6b11921eb4 in KPluginFactory::create<KCModule> (this=0x195cc90, parentWidget=0x0, parent=0x1931ce0, keyword=..., args=...) at /home/arjun/kde/include/KF5/KCoreAddons/kpluginfactory.h:519
#35 0x00007f6b1192198d in KService::createInstance<KCModule> (this=0x17dfbe0, parentWidget=0x0, parent=0x1931ce0, args=..., error=0x7fff56380890) at /home/arjun/kde/include/KF5/KService/kservice.h:526
#36 0x00007f6b11921612 in KService::createInstance<KCModule> (this=0x17dfbe0, parent=0x1931ce0, args=..., error=0x7fff56380890) at /home/arjun/kde/include/KF5/KService/kservice.h:501
#37 0x00007f6b119206cd in KCModuleLoader::loadModule (mod=..., report=KCModuleLoader::Inline, parent=0x1931ce0, args=...) at /home/arjun/kde5-src/frameworks/kcmutils/src/kcmoduleloader.cpp:89
#38 0x00007f6b1192736e in KCModuleProxyPrivate::loadModule (this=0x1931ae0) at /home/arjun/kde5-src/frameworks/kcmutils/src/kcmoduleproxy.cpp:106
#39 0x00007f6b11926f7e in KCModuleProxy::realModule (this=0x1931ce0) at /home/arjun/kde5-src/frameworks/kcmutils/src/kcmoduleproxy.cpp:82
#40 0x00007f6b11927baa in KCModuleProxy::showEvent (this=0x1931ce0, ev=0x7fff56381850) at /home/arjun/kde5-src/frameworks/kcmutils/src/kcmoduleproxy.cpp:192
#41 0x00007f6b0e4c4b60 in QWidget::event (this=0x1931ce0, event=0x7fff56381850) at kernel/qwidget.cpp:8174
#42 0x00007f6b0e47a538 in QApplicationPrivate::notify_helper (this=0x157c880, receiver=0x1931ce0, e=0x7fff56381850) at kernel/qapplication.cpp:3501
#43 0x00007f6b0e47a3a2 in QApplication::notify (this=0x7fff56385190, receiver=0x1931ce0, e=0x7fff56381850) at kernel/qapplication.cpp:3466
#44 0x00007f6b0ce879ea in QCoreApplication::notifyInternal (this=0x7fff56385190, receiver=0x1931ce0, event=0x7fff56381850) at kernel/qcoreapplication.cpp:935
#45 0x00007f6b0e46c5ef in QCoreApplication::sendEvent (receiver=0x1931ce0, event=0x7fff56381850) at ../../include/QtCore/qcoreapplication.h:237
#46 0x00007f6b0e4c22da in QWidgetPrivate::show_helper (this=0x1921870) at kernel/qwidget.cpp:7177
#47 0x00007f6b0e4c1d0c in QWidgetPrivate::show_recursive (this=0x1921870) at kernel/qwidget.cpp:7053
#48 0x00007f6b0e4c3136 in QWidgetPrivate::showChildren (this=0x193c910, spontaneous=false) at kernel/qwidget.cpp:7470
#49 0x00007f6b0e4c2139 in QWidgetPrivate::show_helper (this=0x193c910) at kernel/qwidget.cpp:7129
#50 0x00007f6b0e4c2cb3 in QWidget::setVisible (this=0x18857d0, visible=true) at kernel/qwidget.cpp:7389
#51 0x00007f6b0e4c1c0d in QWidget::show (this=0x18857d0) at kernel/qwidget.cpp:7030
#52 0x00007f6b0e4c3144 in QWidgetPrivate::showChildren (this=0x191fad0, spontaneous=false) at kernel/qwidget.cpp:7472
#53 0x00007f6b0e4c2139 in QWidgetPrivate::show_helper (this=0x191fad0) at kernel/qwidget.cpp:7129
#54 0x00007f6b0e4c2cb3 in QWidget::setVisible (this=0x190a530, visible=true) at kernel/qwidget.cpp:7389
#55 0x00007f6b0e4c1c0d in QWidget::show (this=0x190a530) at kernel/qwidget.cpp:7030
#56 0x00007f6b0e4aaf9b in QStackedLayout::setCurrentIndex (this=0x17e8fa0, index=1) at kernel/qstackedlayout.cpp:332
#57 0x00007f6b0e4ab1ab in QStackedLayout::setCurrentWidget (this=0x17e8fa0, widget=0x190a530) at kernel/qstackedlayout.cpp:387
#58 0x00007f6b0e65fe0d in QStackedWidget::setCurrentWidget (this=0x17eff40, widget=0x190a530) at widgets/qstackedwidget.cpp:250
#59 0x00007f6b0edaef24 in KPageViewPrivate::_k_pageSelected (this=0x17c1330, index=..., previous=...) at /home/arjun/kde5-src/frameworks/kwidgetsaddons/src/kpageview.cpp:246
#60 0x00007f6b0edafe9b in KPageView::qt_static_metacall (_o=0x17f3b30, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7fff56382140) at /home/arjun/kde5-build/frameworks/kwidgetsaddons/src/moc_kpageview.cpp:113
#61 0x00007f6b0cec9f6c in QMetaObject::activate (sender=0x18f7630, signalOffset=3, local_signal_index=0, argv=0x7fff56382140) at kernel/qobject.cpp:3680
#62 0x00007f6b0cec977a in QMetaObject::activate (sender=0x18f7630, m=0x7f6b0d3642c0 <QItemSelectionModel::staticMetaObject>, local_signal_index=0, argv=0x7fff56382140) at kernel/qobject.cpp:3546
#63 0x00007f6b0ce3fdaf in QItemSelectionModel::selectionChanged (this=0x18f7630, _t1=..., _t2=...) at .moc/moc_qitemselectionmodel.cpp:279
#64 0x00007f6b0ce3f0fc in QItemSelectionModel::emitSelectionChanged (this=0x18f7630, newSelection=..., oldSelection=...) at itemmodels/qitemselectionmodel.cpp:1686
#65 0x00007f6b0ce3cbb1 in QItemSelectionModel::select (this=0x18f7630, selection=..., command=...) at itemmodels/qitemselectionmodel.cpp:1242
#66 0x00007f6b0ce3c77f in QItemSelectionModel::select (this=0x18f7630, index=..., command=...) at itemmodels/qitemselectionmodel.cpp:1117
#67 0x00007f6b0ce3cfea in QItemSelectionModel::setCurrentIndex (this=0x18f7630, index=..., command=...) at itemmodels/qitemselectionmodel.cpp:1313
#68 0x00007f6b0edae3be in KPageViewPrivate::_k_rebuildGui (this=0x17c1330) at /home/arjun/kde5-src/frameworks/kwidgetsaddons/src/kpageview.cpp:68
#69 0x00007f6b0edaec18 in KPageViewPrivate::_k_modelChanged (this=0x17c1330) at /home/arjun/kde5-src/frameworks/kwidgetsaddons/src/kpageview.cpp:199
#70 0x00007f6b0edafe69 in KPageView::qt_static_metacall (_o=0x17f3b30, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fff563828a0) at /home/arjun/kde5-build/frameworks/kwidgetsaddons/src/moc_kpageview.cpp:112
#71 0x00007f6b0cec9f6c in QMetaObject::activate (sender=0x17cdcd0, signalOffset=3, local_signal_index=3, argv=0x7fff563828a0) at kernel/qobject.cpp:3680
#72 0x00007f6b0cec977a in QMetaObject::activate (sender=0x17cdcd0, m=0x7f6b0d3677e0 <QAbstractItemModel::staticMetaObject>, local_signal_index=3, argv=0x7fff563828a0) at kernel/qobject.cpp:3546
#73 0x00007f6b0cf58c4a in QAbstractItemModel::layoutChanged (this=0x17cdcd0, _t1=..., _t2=QAbstractItemModel::NoLayoutChangeHint) at .moc/moc_qabstractitemmodel.cpp:406
#74 0x00007f6b0edb609d in KPageWidgetModel::addPage (this=0x17cdcd0, item=0x19262c0) at /home/arjun/kde5-src/frameworks/kwidgetsaddons/src/kpagewidgetmodel.cpp:423
#75 0x00007f6b0edb444f in KPageWidget::addPage (this=0x17f3b30, item=0x19262c0) at /home/arjun/kde5-src/frameworks/kwidgetsaddons/src/kpagewidget.cpp:89
#76 0x00007f6b11db86bf in ModuleView::addModule (this=0x17f2cf0, module=0x17fc438) at /home/arjun/kde5-src/kde/workspace/systemsettings/core/ModuleView.cpp:196
#77 0x00007f6b11db810f in ModuleView::loadModule (this=0x17f2cf0, menuItem=...) at /home/arjun/kde5-src/kde/workspace/systemsettings/core/ModuleView.cpp:149
#78 0x00007f6af95cd216 in IconMode::changeModule (this=0x17eac30, activeModule=...) at /home/arjun/kde5-src/kde/workspace/systemsettings/icons/IconMode.cpp:145
#79 0x00007f6af95d14d5 in IconMode::qt_static_metacall (_o=0x17eac30, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff56382dc0) at /home/arjun/kde5-build/kde/workspace/systemsettings/icons/moc_IconMode.cpp:84
#80 0x00007f6b0cec9f6c in QMetaObject::activate (sender=0x182e910, signalOffset=7, local_signal_index=3, argv=0x7fff56382dc0) at kernel/qobject.cpp:3680
#81 0x00007f6b0cec977a in QMetaObject::activate (sender=0x182e910, m=0x7f6b0ec96c00 <QAbstractItemView::staticMetaObject>, local_signal_index=3, argv=0x7fff56382dc0) at kernel/qobject.cpp:3546
#82 0x00007f6b0e737ac5 in QAbstractItemView::activated (this=0x182e910, _t1=...) at .moc/moc_qabstractitemview.cpp:603
#83 0x00007f6b0e72cf5c in QAbstractItemView::mouseReleaseEvent (this=0x182e910, event=0x7fff56383fa0) at itemviews/qabstractitemview.cpp:1868
#84 0x00007f6b0e74d709 in QListView::mouseReleaseEvent (this=0x182e910, e=0x7fff56383fa0) at itemviews/qlistview.cpp:799
#85 0x00007f6b11b784a6 in KCategorizedView::mouseReleaseEvent (this=0x182e910, event=0x7fff56383fa0) at /home/arjun/kde5-src/frameworks/kitemviews/src/kcategorizedview.cpp:1031
#86 0x00007f6b0e4c3fb9 in QWidget::event (this=0x182e910, event=0x7fff56383fa0) at kernel/qwidget.cpp:7959
#87 0x00007f6b0e5f08e5 in QFrame::event (this=0x182e910, e=0x7fff56383fa0) at widgets/qframe.cpp:534
#88 0x00007f6b0e68ce75 in QAbstractScrollArea::viewportEvent (this=0x182e910, e=0x7fff56383fa0) at widgets/qabstractscrollarea.cpp:1194
#89 0x00007f6b0e72bdc6 in QAbstractItemView::viewportEvent (this=0x182e910, event=0x7fff56383fa0) at itemviews/qabstractitemview.cpp:1689
#90 0x00007f6b0e68e0c9 in QAbstractScrollAreaPrivate::viewportEvent (this=0x182e950, event=0x7fff56383fa0) at widgets/qabstractscrollarea_p.h:110
#91 0x00007f6b0e68e190 in QAbstractScrollAreaFilter::eventFilter (this=0x18304d0, o=0x182ee10, e=0x7fff56383fa0) at widgets/qabstractscrollarea_p.h:126
#92 0x00007f6b0ce87d5b in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x157c880, receiver=0x182ee10, event=0x7fff56383fa0) at kernel/qcoreapplication.cpp:1031
#93 0x00007f6b0e47a50f in QApplicationPrivate::notify_helper (this=0x157c880, receiver=0x182ee10, e=0x7fff56383fa0) at kernel/qapplication.cpp:3497
#94 0x00007f6b0e478473 in QApplication::notify (this=0x7fff56385190, receiver=0x182ee10, e=0x7fff56383fa0) at kernel/qapplication.cpp:3068
#95 0x00007f6b0ce879ea in QCoreApplication::notifyInternal (this=0x7fff56385190, receiver=0x182ee10, event=0x7fff56383fa0) at kernel/qcoreapplication.cpp:935
#96 0x00007f6b0e47c787 in QCoreApplication::sendSpontaneousEvent (receiver=0x182ee10, event=0x7fff56383fa0) at ../../include/QtCore/qcoreapplication.h:240
#97 0x00007f6b0e476dbf in QApplicationPrivate::sendMouseEvent (receiver=0x182ee10, event=0x7fff56383fa0, alienWidget=0x182ee10, nativeWidget=0x15fd220, buttonDown=0x7f6b0ecb1670 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2541
#98 0x00007f6b0e4f0ac9 in QWidgetWindow::handleMouseEvent (this=0x177dea0, event=0x7fff56384ad0) at kernel/qwidgetwindow.cpp:507
#99 0x00007f6b0e4ef909 in QWidgetWindow::event (this=0x177dea0, event=0x7fff56384ad0) at kernel/qwidgetwindow.cpp:179
#100 0x00007f6b0e47a538 in QApplicationPrivate::notify_helper (this=0x157c880, receiver=0x177dea0, e=0x7fff56384ad0) at kernel/qapplication.cpp:3501
#101 0x00007f6b0e477cca in QApplication::notify (this=0x7fff56385190, receiver=0x177dea0, e=0x7fff56384ad0) at kernel/qapplication.cpp:2954
#102 0x00007f6b0ce879ea in QCoreApplication::notifyInternal (this=0x7fff56385190, receiver=0x177dea0, event=0x7fff56384ad0) at kernel/qcoreapplication.cpp:935
#103 0x00007f6b0dbfc89b in QCoreApplication::sendSpontaneousEvent (receiver=0x177dea0, event=0x7fff56384ad0) at ../../include/QtCore/qcoreapplication.h:240
#104 0x00007f6b0dbf6096 in QGuiApplicationPrivate::processMouseEvent (e=0x1911880) at kernel/qguiapplication.cpp:1711
#105 0x00007f6b0dbf56da in QGuiApplicationPrivate::processWindowSystemEvent (e=0x1911880) at kernel/qguiapplication.cpp:1512
#106 0x00007f6b0dbdfac7 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:579
#107 0x00007f6b050f7db8 in userEventSourceDispatch (source=0x15c3560) at eventdispatchers/qeventdispatcher_glib.cpp:78
#108 0x000000334ea492a6 in g_main_dispatch (context=0x7f6b00002e00) at gmain.c:3066
#109 g_main_context_dispatch (context=context@entry=0x7f6b00002e00) at gmain.c:3642
#110 0x000000334ea49628 in g_main_context_iterate (context=context@entry=0x7f6b00002e00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3713
#111 0x000000334ea496dc in g_main_context_iteration (context=0x7f6b00002e00, may_block=1) at gmain.c:3774
#112 0x00007f6b0ceff5d1 in QEventDispatcherGlib::processEvents (this=0x15b95d0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#113 0x00007f6b050f7fca in QPAEventDispatcherGlib::processEvents (this=0x15b95d0, flags=...) at eventdispatchers/qeventdispatcher_glib.cpp:123
#114 0x00007f6b0ce8469e in QEventLoop::processEvents (this=0x7fff56385090, flags=...) at kernel/qeventloop.cpp:136
#115 0x00007f6b0ce84981 in QEventLoop::exec (this=0x7fff56385090, flags=...) at kernel/qeventloop.cpp:212
#116 0x00007f6b0ce880d3 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#117 0x00007f6b0dbf5486 in QGuiApplication::exec () at kernel/qguiapplication.cpp:1446
#118 0x00007f6b0e4774f7 in QApplication::exec () at kernel/qapplication.cpp:2746
#119 0x0000000000421909 in main (argc=1, argv=0x7fff56385458) at /home/arjun/kde5-src/kde/workspace/systemsettings/app/main.cpp:55

I fixed some changes in kauth backend loading. This is probably fixed.