Version:           unspecified
OS:                Linux

I do multiple search into "All effects" in desktop effects, I have my desktop into spanish. At searching it freeze sometime.
In console I have:
systemsettings(29262)/kwin KWin::CompositingPrefs::detectDriverAndVersion: GL vendor is "NVIDIA Corporation" 
systemsettings(29262)/kwin KWin::CompositingPrefs::detectDriverAndVersion: GL renderer is "GeForce 9500 GT/PCI/SSE2" 
systemsettings(29262)/kwin KWin::CompositingPrefs::detectDriverAndVersion: GL version is "3.2.0 NVIDIA 195.36.24" 
systemsettings(29262)/kwin KWin::CompositingPrefs::detectDriverAndVersion: Detected driver "nvidia" , version "195.36.24"
And the bt where block:
#0  0x00007ffff740cf4a in QRect::topLeft (this=0x7fffffffb1f0) at /usr/include/qt4/QtCore/qrect.h:289
#1  0x00007ffff74a26f3 in KCategorizedView::Private::highestElementInLastRow (this=0xb98b80, block=<value optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/itemviews/kcategorizedview.cpp:373
#2  0x00007ffff74a29cc in KCategorizedView::Private::blockHeight (this=0xb98b80, category=<value optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/itemviews/kcategorizedview.cpp:253
#3  0x00007ffff74a2ba3 in KCategorizedView::Private::blockPosition (this=0xb98b80, category=<value optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/itemviews/kcategorizedview.cpp:223
#4  0x00007ffff74a6e41 in KCategorizedView::visualRect (this=0xb93540, index=...) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/itemviews/kcategorizedview.cpp:568
#5  0x00007ffff74a73bb in KCategorizedView::Private::rowsInserted (this=0xb98b80, parent=<value optimized out>, start=<value optimized out>, end=<value optimized out>)
    at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/itemviews/kcategorizedview.cpp:310
#6  0x00007ffff74a797e in KCategorizedView::slotLayoutChanged (this=0xb93540) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/itemviews/kcategorizedview.cpp:1458
#7  0x00007ffff74a09f1 in KCategorizedView::qt_metacall (this=0xb93540, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffffffb9a0)
    at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1_build/kdeui/kcategorizedview.moc:82
#8  0x00007ffff5a0498a in QMetaObject::activate (sender=0xb99b60, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#9  0x00007ffff6cfbff0 in QSortFilterProxyModel::qt_metacall (this=0xb99b60, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffffffbb10) at .moc/debug-shared/moc_qsortfilterproxymodel.cpp:127
#10 0x00007ffff5a0498a in QMetaObject::activate (sender=0xb91820, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#11 0x00007ffff6b0b6e2 in QLineEdit::textChanged (this=0x7fffffffb1f0, _t1=<value optimized out>) at .moc/debug-shared/moc_qlineedit.cpp:238
#12 0x00007ffff6b0fbec in QLineEdit::qt_metacall (this=0xb91820, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffffffbcf0) at .moc/debug-shared/moc_qlineedit.cpp:156
#13 0x00007ffff75c4ba5 in KLineEdit::qt_metacall (this=0x7fffffffb1f0, _c=QMetaObject::InvokeMetaMethod, _id=-598, _a=0x0) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1_build/kdeui/klineedit.moc:133
#14 0x00007ffff5a0498a in QMetaObject::activate (sender=0xb91c30, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#15 0x00007ffff6e1bee5 in QLineControl::textChanged (this=0x7fffffffb1f0, _t1=<value optimized out>) at .moc/debug-shared/moc_qlinecontrol_p.cpp:131
#16 0x00007ffff6b16916 in QLineControl::finishChange (this=0xb91c30, validateFromState=78, update=<value optimized out>, edited=true) at widgets/qlinecontrol.cpp:605
#17 0x00007ffff6b1869d in QLineControl::processKeyEvent (this=0xb91c30, event=0x7fffffffcb00) at widgets/qlinecontrol.cpp:1780
#18 0x00007ffff6b0b9a1 in QLineEdit::keyPressEvent (this=<value optimized out>, event=0x0) at widgets/qlineedit.cpp:1667
#19 0x00007ffff75c398d in KLineEdit::keyPressEvent (this=0xb91820, e=0x7fffffffcb00) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/widgets/klineedit.cpp:940
#20 0x00007ffff66dcc76 in QWidget::event (this=0xb91820, event=0x7fffffffcb00) at kernel/qwidget.cpp:8079
#21 0x00007ffff6b0d1f3 in QLineEdit::event (this=0xb91820, e=0x7fffffffcb00) at widgets/qlineedit.cpp:1480
#22 0x00007ffff75c0fe3 in KLineEdit::event (this=0xb91820, ev=0x7fffffffcb00) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/widgets/klineedit.cpp:1394
#23 0x00007ffff6674cc0 in QApplicationPrivate::notify_helper (this=0x644e30, receiver=0xb91820, e=0x7fffffffcb00) at kernel/qapplication.cpp:4302
#24 0x00007ffff667dfc7 in QApplication::notify (this=<value optimized out>, receiver=0xb91820, e=0x7fffffffcb00) at kernel/qapplication.cpp:3765
#25 0x00007ffff74d69c1 in KApplication::notify (this=0x7fffffffda60, receiver=0xb91820, event=0x7fffffffcb00) at /var/tmp/portage/kde-base/kdelibs-4.5.1/work/kdelibs-4.5.1/kdeui/kernel/kapplication.cpp:310
#26 0x00007ffff59ec50b in QCoreApplication::notifyInternal (this=0x7fffffffda60, receiver=0xb91820, event=0x7fffffffcb00) at kernel/qcoreapplication.cpp:726
#27 0x00007ffff673aaca in QKeyMapper::sendKeyEvent (keyWidget=0xb91820, grab=<value optimized out>, type=QEvent::KeyPress, code=66, modifiers=<value optimized out>, text=..., autorepeat=false, count=1, nativeScanCode=56, 
    nativeVirtualKey=98, nativeModifiers=16) at kernel/qkeymapper_x11.cpp:1875
#28 0x00007ffff673d171 in QKeyMapperPrivate::translateKeyEvent (this=0x675a80, keyWidget=0xb91820, event=<value optimized out>, grab=false) at kernel/qkeymapper_x11.cpp:1845
#29 0x00007ffff6713234 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffffffd6b0) at kernel/qapplication_x11.cpp:3406
#30 0x00007ffff6740522 in x11EventSourceDispatch (s=0x6486f0, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#31 0x00007ffff342383f in g_main_dispatch (context=0x647480) at gmain.c:1960
#32 IA__g_main_context_dispatch (context=0x647480) at gmain.c:2513
#33 0x00007ffff3427bf8 in g_main_context_iterate (context=0x647480, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2591
#34 0x00007ffff3427dac in IA__g_main_context_iteration (context=0x647480, may_block=1) at gmain.c:2654
#35 0x00007ffff5a1ddf3 in QEventDispatcherGlib::processEvents (this=0x643cd0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#36 0x00007ffff674006e in QGuiEventDispatcherGlib::processEvents (this=0x7fffffffb1f0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00007ffff59ea8b2 in QEventLoop::processEvents (this=<value optimized out>, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece.
) at kernel/qeventloop.cpp:149
#38 0x00007ffff59ead55 in QEventLoop::exec (this=0x7fffffffd9d0, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece.
) at kernel/qeventloop.cpp:201
#39 0x00007ffff59ed83b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#40 0x000000000041734f in main (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/kde-base/systemsettings-4.5.1/work/systemsettings-4.5.1/systemsettings/app/main.cpp:49

Reproducible: Didn't try