from dupe:
-----------------

Application: systemsettings (1.0)
KDE Platform Version: 4.9.00
Qt Version: 4.8.2
Operating System: Linux 3.5.0-11-generic x86_64
Distribution: Ubuntu quantal (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
I was trying to change some appearance of my workspace but systemsettings crashed

The crash can be reproduced every time.

-- Backtrace:
Application: Ustawienia systemowe (systemsettings), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3a9877e780 (LWP 2208))]

Thread 2 (Thread 0x7f3a7bb27700 (LWP 2225)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f3a9384f967 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f3a9384f999 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f3a8f662e9a in start_thread (arg=0x7f3a7bb27700) at pthread_create.c:308
#4  0x00007f3a9579439d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f3a9877e780 (LWP 2208)):
[KCrash Handler]
#6  __memcpy_sse2 () at ../sysdeps/x86_64/multiarch/../memcpy.S:202
#7  0x00007f3a9379249b in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#8  0x00007f3a937a7d5f in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#9  0x00007f3a937a4103 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#10 0x00007f3a937f0f08 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#11 0x00007f3a937f15bc in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#12 0x00007f3a93891db0 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#13 0x00007f3a93892da6 in QScriptEngine::QScriptEngine() () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#14 0x00007f3a92b19d0c in QDeclarativeScriptEngine::QDeclarativeScriptEngine (this=0x1a13908, priv=0x1a13800) at qml/qdeclarativeengine.cpp:382
#15 0x00007f3a92b1ebaf in QDeclarativeEnginePrivate::QDeclarativeEnginePrivate (this=0x1a13800, e=0x1a113c0) at qml/qdeclarativeengine.cpp:353
#16 0x00007f3a92b1eec1 in QDeclarativeEngine::QDeclarativeEngine (this=0x1a113c0, parent=0x0) at qml/qdeclarativeengine.cpp:634
#17 0x00007f3a92a1d766 in QDeclarativeViewPrivate::init (this=this@entry=0x19fae30) at util/qdeclarativeview.cpp:281
#18 0x00007f3a92a1d993 in QDeclarativeView::QDeclarativeView (this=0x19fae00, parent=0x1abcbf0) at util/qdeclarativeview.cpp:261
#19 0x00007f3a7bd74c09 in Ui_KWinDecorationForm::setupUi (this=this@entry=0x1abcc18, KWinDecorationForm=KWinDecorationForm@entry=0x1abcbf0) at ./ui_decoration.h:56
#20 0x00007f3a7bd71288 in KWin::KWinDecorationForm::KWinDecorationForm (this=0x1abcbf0, parent=<optimized out>) at ../../../../kwin/kcmkwin/kwindecoration/kwindecoration.cpp:68
#21 0x00007f3a7bd73bfe in KWin::KWinDecorationModule::KWinDecorationModule (this=0x19ddba0, parent=<optimized out>) at ../../../../kwin/kcmkwin/kwindecoration/kwindecoration.cpp:82
#22 0x00007f3a7bd755c4 in KPluginFactory::createInstance<KWin::KWinDecorationModule, QWidget> (parentWidget=<optimized out>, parent=<optimized out>, args=...) at /usr/include/KDE/../kpluginfactory.h:477
#23 0x00007f3a966ad1c5 in KPluginFactory::create (this=0x1a984d0, iface=0x7f3a979a8c40 <qt_meta_stringdata_KCModule> "KCModule", parentWidget=0x0, parent=0x16a8840, args=..., keyword=...) at ../../kdecore/util/kpluginfactory.cpp:203
#24 0x00007f3a97e8988a in create<KCModule> (args=..., keyword=..., parent=0x16a8840, parentWidget=0x0, this=<optimized out>) at ../../kdecore/util/kpluginfactory.h:531
#25 createInstance<KCModule> (error=0x7fff6896da60, args=..., parent=0x16a8840, parentWidget=0x0, this=0x15f5ff0) at ../../kdecore/services/kservice.h:559
#26 createInstance<KCModule> (error=0x7fff6896da60, args=..., parent=0x16a8840, this=0x15f5ff0) at ../../kdecore/services/kservice.h:536
#27 KCModuleLoader::loadModule (mod=..., report=KCModuleLoader::Inline, parent=0x16a8840, args=...) at ../../kutils/kcmoduleloader.cpp:89
#28 0x00007f3a97e8e870 in KCModuleProxyPrivate::loadModule (this=this@entry=0x1abafd0) at ../../kutils/kcmoduleproxy.cpp:106
#29 0x00007f3a97e8efc5 in KCModuleProxy::realModule (this=this@entry=0x16a8840) at ../../kutils/kcmoduleproxy.cpp:83
#30 0x00007f3a97e8f002 in KCModuleProxy::showEvent (this=0x16a8840, ev=0x7fff6896e520) at ../../kutils/kcmoduleproxy.cpp:197
#31 0x00007f3a96b829ae in QWidget::event (this=0x16a8840, event=0x7fff6896e520) at kernel/qwidget.cpp:8578
#32 0x00007f3a96b32d9c in QApplicationPrivate::notify_helper (this=this@entry=0x1249120, receiver=receiver@entry=0x16a8840, e=e@entry=0x7fff6896e520) at kernel/qapplication.cpp:4556
#33 0x00007f3a96b3720a in QApplication::notify (this=0x7fff68970ad0, receiver=0x16a8840, e=0x7fff6896e520) at kernel/qapplication.cpp:4417
#34 0x00007f3a9783aaf6 in KApplication::notify (this=0x7fff68970ad0, receiver=0x16a8840, event=0x7fff6896e520) at ../../kdeui/kernel/kapplication.cpp:311
#35 0x00007f3a95ed892e in QCoreApplication::notifyInternal (this=0x7fff68970ad0, receiver=0x16a8840, event=0x7fff6896e520) at kernel/qcoreapplication.cpp:915
#36 0x00007f3a96b849b7 in sendEvent (event=0x7fff6896e520, receiver=0x16a8840) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#37 QWidgetPrivate::show_helper (this=0x1a8d0d0) at kernel/qwidget.cpp:7551
#38 0x00007f3a96b8482a in QWidgetPrivate::showChildren (this=this@entry=0x1aa4ce0, spontaneous=spontaneous@entry=false) at kernel/qwidget.cpp:7859
#39 0x00007f3a96b848bd in QWidgetPrivate::show_helper (this=this@entry=0x1aa4ce0) at kernel/qwidget.cpp:7498
#40 0x00007f3a96b84ca2 in QWidget::setVisible (this=0x1a815e0, visible=<optimized out>) at kernel/qwidget.cpp:7773
#41 0x00007f3a96b8483e in show (this=0x1a815e0) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:494
#42 QWidgetPrivate::showChildren (this=this@entry=0x1a98a70, spontaneous=spontaneous@entry=false) at kernel/qwidget.cpp:7861
#43 0x00007f3a96b848bd in QWidgetPrivate::show_helper (this=this@entry=0x1a98a70) at kernel/qwidget.cpp:7498
#44 0x00007f3a96b84ca2 in QWidget::setVisible (this=0x1aaa050, visible=<optimized out>) at kernel/qwidget.cpp:7773
#45 0x00007f3a96b666ca in show (this=0x1aaa050) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:494
#46 QStackedLayout::setCurrentIndex (this=0x16a6c80, index=1) at kernel/qstackedlayout.cpp:311
#47 0x00007f3a97868b1f in KPageViewPrivate::_k_pageSelected (this=0x16a6300, index=..., previous=...) at ../../kdeui/paged/kpageview.cpp:235
#48 0x00007f3a95eee31f in QMetaObject::activate (sender=0x1a916f0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff6896e9e0) at kernel/qobject.cpp:3547
#49 0x00007f3a97091557 in QItemSelectionModel::selectionChanged (this=this@entry=0x1a916f0, _t1=..., _t2=...) at .moc/release-shared/moc_qitemselectionmodel.cpp:166
#50 0x00007f3a970961f3 in QItemSelectionModel::emitSelectionChanged (this=this@entry=0x1a916f0, newSelection=..., oldSelection=...) at itemviews/qitemselectionmodel.cpp:1544
#51 0x00007f3a970973bc in QItemSelectionModel::select (this=0x1a916f0, selection=..., command=...) at itemviews/qitemselectionmodel.cpp:1110
#52 0x00007f3a9709306b in QItemSelectionModel::select (this=this@entry=0x1a916f0, index=..., command=...) at itemviews/qitemselectionmodel.cpp:985
#53 0x00007f3a970917a1 in QItemSelectionModel::setCurrentIndex (this=0x1a916f0, index=..., command=...) at itemviews/qitemselectionmodel.cpp:1174
#54 0x00007f3a9786797f in KPageViewPrivate::_k_rebuildGui (this=0x16a6300) at ../../kdeui/paged/kpageview.cpp:70
#55 0x00007f3a97868885 in KPageViewPrivate::_k_modelChanged (this=0x16a6300) at ../../kdeui/paged/kpageview.cpp:190
#56 0x00007f3a95eee31f in QMetaObject::activate (sender=0x16ab2d0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#57 0x00007f3a9786d041 in KPageWidgetModel::addPage (this=0x16ab2d0, item=0x1a91f70) at ../../kdeui/paged/kpagewidgetmodel.cpp:401
#58 0x00007f3a97c67990 in ModuleView::addModule (this=this@entry=0x16a4ae0, module=0x1627758) at ../../../systemsettings/core/ModuleView.cpp:191
#59 0x00007f3a97c67fb2 in ModuleView::loadModule (this=0x16a4ae0, menuItem=...) at ../../../systemsettings/core/ModuleView.cpp:144
#60 0x00007f3a7d28f6c8 in IconMode::changeModule (this=0x169e1a0, activeModule=...) at ../../../systemsettings/icons/IconMode.cpp:134
#61 0x00007f3a95eee31f in QMetaObject::activate (sender=0x16bd490, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff6896f210) at kernel/qobject.cpp:3547
#62 0x00007f3a9703c525 in QAbstractItemView::activated (this=this@entry=0x16bd490, _t1=...) at .moc/release-shared/moc_qabstractitemview.cpp:362
#63 0x00007f3a9703c6d4 in QAbstractItemView::mouseDoubleClickEvent (this=0x16bd490, event=0x7fff6896fe60) at itemviews/qabstractitemview.cpp:1849
#64 0x00007f3a96b8264a in QWidget::event (this=0x16bd490, event=0x7fff6896fe60) at kernel/qwidget.cpp:8375
#65 0x00007f3a96f311d6 in QFrame::event (this=0x16bd490, e=0x7fff6896fe60) at widgets/qframe.cpp:557
#66 0x00007f3a9703eb23 in QAbstractItemView::viewportEvent (this=0x16bd490, event=0x7fff6896fe60) at itemviews/qabstractitemview.cpp:1644
#67 0x00007f3a95ed8a96 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0x16a6010, event=0x7fff6896fe60) at kernel/qcoreapplication.cpp:1025
#68 0x00007f3a96b32d6c in QApplicationPrivate::notify_helper (this=this@entry=0x1249120, receiver=receiver@entry=0x16a6010, e=e@entry=0x7fff6896fe60) at kernel/qapplication.cpp:4552
#69 0x00007f3a96b37a6b in QApplication::notify (this=<optimized out>, receiver=0x16a6010, e=0x7fff6896fe60) at kernel/qapplication.cpp:4099
#70 0x00007f3a9783aaf6 in KApplication::notify (this=0x7fff68970ad0, receiver=0x16a6010, event=0x7fff6896fe60) at ../../kdeui/kernel/kapplication.cpp:311
#71 0x00007f3a95ed892e in QCoreApplication::notifyInternal (this=0x7fff68970ad0, receiver=0x16a6010, event=0x7fff6896fe60) at kernel/qcoreapplication.cpp:915
#72 0x00007f3a96b33bd3 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#73 QApplicationPrivate::sendMouseEvent (receiver=0x16a6010, event=0x7fff6896fe60, alienWidget=0x16a6010, nativeWidget=0x13d0430, buttonDown=0x7f3a9760f2e8 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3167
#74 0x00007f3a96bb12a4 in QETWidget::translateMouseEvent (this=this@entry=0x13d0430, event=event@entry=0x7fff689705e0) at kernel/qapplication_x11.cpp:4617
#75 0x00007f3a96bb019f in QApplication::x11ProcessEvent (this=0x7fff68970ad0, event=0x7fff689705e0) at kernel/qapplication_x11.cpp:3732
#76 0x00007f3a96bd7d02 in x11EventSourceDispatch (s=0x123e700, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#77 0x00007f3a8f193db5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#78 0x00007f3a8f1940e8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#79 0x00007f3a8f1941a4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#80 0x00007f3a95f07076 in QEventDispatcherGlib::processEvents (this=0x11f8ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#81 0x00007f3a96bd797e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#82 0x00007f3a95ed767f in QEventLoop::processEvents (this=this@entry=0x7fff689709b0, flags=...) at kernel/qeventloop.cpp:149
#83 0x00007f3a95ed7908 in QEventLoop::exec (this=0x7fff689709b0, flags=...) at kernel/qeventloop.cpp:204
#84 0x00007f3a95edcac8 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#85 0x000000000040a98e in main (argc=5, argv=0x7fff68970c18) at ../../../systemsettings/app/main.cpp:49

Reported using DrKonqi