Crash if I close Systemsettings while kcm-language is loading, see http://ubuntuone.com/2elkr9n33oAARtr5Bfl0xU. (Triggered in video: clicked Locale and pressed Alt + F4 immediately.)
Reproducible with Kubuntu 13.10 and latest (01/19/14) Kubuntu 14.04 daily iso.
Initially this was reported here: https://bugs.kde.org/show_bug.cgi?id=329329 but Christoph Feck could not reproduce it and I was also unsuccessful reproducing it using Opensuse 13.1 (same KDE version), so this seems to be Kubuntu specific.
Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f47819bc7c0 (LWP 4801))]
Thread 2 (Thread 0x7f47642ad700 (LWP 4802)):
#0 0x00007f477e9a574d in poll () at ../sysdeps/unix/syscall-template.S:81
#1 0x00007f47778f2d34 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f475c002bb0, timeout=-1, context=0x7f475c0009a0) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:4008
#2 g_main_context_iterate (context=context@entry=0x7f475c0009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3709
#3 0x00007f47778f2e3c in g_main_context_iteration (context=0x7f475c0009a0, may_block=1) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3775
#4 0x00007f477f12d836 in QEventDispatcherGlib::processEvents (this=0x7f475c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#5 0x00007f477f0ff09f in QEventLoop::processEvents (this=this@entry=0x7f47642acde0, flags=...) at kernel/qeventloop.cpp:149
#6 0x00007f477f0ff395 in QEventLoop::exec (this=this@entry=0x7f47642acde0, flags=...) at kernel/qeventloop.cpp:204
#7 0x00007f477effbc4f in QThread::exec (this=this@entry=0x1f0cd50) at thread/qthread.cpp:537
#8 0x00007f477f0e0813 in QInotifyFileSystemWatcherEngine::run (this=0x1f0cd50) at io/qfilesystemwatcher_inotify.cpp:265
#9 0x00007f477effe31f in QThreadPrivate::start (arg=0x1f0cd50) at thread/qthread_unix.cpp:349
#10 0x00007f4777dcc182 in start_thread (arg=0x7f47642ad700) at pthread_create.c:312
#11 0x00007f477e9b2b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Thread 1 (Thread 0x7f47819bc7c0 (LWP 4801)):
[KCrash Handler]
#6 KCMLocale::~KCMLocale (this=0x2ba5f00, __in_chrg=<optimized out>) at ../../../kcontrol/locale/kcmlocale.cpp:303
#7 0x00007f4764a902d9 in KCMLocale::~KCMLocale (this=0x2ba5f00, __in_chrg=<optimized out>) at ../../../kcontrol/locale/kcmlocale.cpp:312
#8 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1d01d70) at kernel/qobject.cpp:1907
#9 0x00007f477fdbad37 in QWidget::~QWidget (this=0x2b6dc30, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#10 0x00007f47810d5fbb in KCModuleProxy::~KCModuleProxy (this=0x2b6dc30, __in_chrg=<optimized out>) at ../../kutils/kcmoduleproxy.cpp:209
#11 0x00007f47810d6069 in KCModuleProxy::~KCModuleProxy (this=0x2b6dc30, __in_chrg=<optimized out>) at ../../kutils/kcmoduleproxy.cpp:215
#12 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x2b1ed30) at kernel/qobject.cpp:1907
#13 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1869b50, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#14 0x00007f477fdbb049 in QWidget::~QWidget (this=0x1869b50, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1703
#15 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x2b9adb0) at kernel/qobject.cpp:1907
#16 0x00007f477fdbad37 in QWidget::~QWidget (this=0x2b37490, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#17 0x00007f47801de649 in QScrollArea::~QScrollArea (this=0x2b37490, __in_chrg=<optimized out>) at widgets/qscrollarea.cpp:176
#18 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1cfd370) at kernel/qobject.cpp:1907
#19 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1cfd330, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#20 0x00007f4780aa7e2e in ~KPageStackedWidget (this=0x1cfd330, __in_chrg=<optimized out>) at ../../kdeui/paged/kpageview_p.h:37
#21 KPageStackedWidget::~KPageStackedWidget (this=0x1cfd330, __in_chrg=<optimized out>) at ../../kdeui/paged/kpageview_p.h:37
#22 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1cfcd60) at kernel/qobject.cpp:1907
#23 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1cfc370, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#24 0x00007f4780aaa8a9 in KPageWidget::~KPageWidget (this=0x1cfc370, __in_chrg=<optimized out>) at ../../kdeui/paged/kpagewidget.cpp:78
#25 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1cfc860) at kernel/qobject.cpp:1907
#26 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1cfc330, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#27 0x00007f4780eaeed9 in ModuleView::~ModuleView (this=0x1cfc330, __in_chrg=<optimized out>) at ../../../systemsettings/core/ModuleView.cpp:107
#28 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1cfc450) at kernel/qobject.cpp:1907
#29 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1cfc2d0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#30 0x00007f47801b6e49 in QStackedWidget::~QStackedWidget (this=0x1cfc2d0, __in_chrg=<optimized out>) at widgets/qstackedwidget.cpp:196
#31 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1a17590) at kernel/qobject.cpp:1907
#32 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1a3c880, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#33 0x00007f47801b6e49 in QStackedWidget::~QStackedWidget (this=0x1a3c880, __in_chrg=<optimized out>) at widgets/qstackedwidget.cpp:196
#34 0x00007f477f117158 in QObjectPrivate::deleteChildren (this=this@entry=0x1a18250) at kernel/qobject.cpp:1907
#35 0x00007f477fdbad37 in QWidget::~QWidget (this=0x1a18030, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1679
#36 0x00007f4780b2f0b5 in KMainWindow::~KMainWindow (this=0x1a18030, __in_chrg=<optimized out>) at ../../kdeui/widgets/kmainwindow.cpp:467
#37 0x000000000040bb1e in SettingsBase::~SettingsBase (this=0x1a18030, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../../systemsettings/app/SettingsBase.cpp:69
#38 0x000000000040bb69 in SettingsBase::~SettingsBase (this=0x1a18030, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../../systemsettings/app/SettingsBase.cpp:72
#39 0x00007f477f118c48 in QObject::event (this=this@entry=0x1a18030, e=e@entry=0x2198280) at kernel/qobject.cpp:1175
#40 0x00007f477fdbe55b in QWidget::event (this=this@entry=0x1a18030, event=event@entry=0x2198280) at kernel/qwidget.cpp:8846
#41 0x00007f47801789d3 in QMainWindow::event (this=this@entry=0x1a18030, event=event@entry=0x2198280) at widgets/qmainwindow.cpp:1478
#42 0x00007f4780b300b1 in KMainWindow::event (this=this@entry=0x1a18030, ev=ev@entry=0x2198280) at ../../kdeui/widgets/kmainwindow.cpp:1084
#43 0x00007f4780b67ae9 in KXmlGuiWindow::event (this=0x1a18030, ev=0x2198280) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#44 0x00007f477fd6ee2c in QApplicationPrivate::notify_helper (this=this@entry=0x18629f0, receiver=receiver@entry=0x1a18030, e=e@entry=0x2198280) at kernel/qapplication.cpp:4567
#45 0x00007f477fd754a0 in QApplication::notify (this=this@entry=0x7fff9173c9a0, receiver=receiver@entry=0x1a18030, e=e@entry=0x2198280) at kernel/qapplication.cpp:4353
#46 0x00007f4780a7baaa in KApplication::notify (this=0x7fff9173c9a0, receiver=0x1a18030, event=0x2198280) at ../../kdeui/kernel/kapplication.cpp:311
#47 0x00007f477f1004cd in QCoreApplication::notifyInternal (this=0x7fff9173c9a0, receiver=receiver@entry=0x1a18030, event=event@entry=0x2198280) at kernel/qcoreapplication.cpp:953
#48 0x00007f477f103b2d in sendEvent (event=0x2198280, receiver=0x1a18030) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#49 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x17ff1f0) at kernel/qcoreapplication.cpp:1577
#50 0x00007f477f103fd3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#51 0x00007f477f12df53 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#52 postEventSourceDispatch (s=0x1852f00) at kernel/qeventdispatcher_glib.cpp:280
#53 0x00007f47778f2b54 in g_main_dispatch (context=0x1853990) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3068
#54 g_main_context_dispatch (context=context@entry=0x1853990) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3643
#55 0x00007f47778f2d98 in g_main_context_iterate (context=context@entry=0x1853990, block=block@entry=0, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3714
#56 0x00007f47778f2e3c in g_main_context_iteration (context=0x1853990, may_block=0) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3775
#57 0x00007f477f12d815 in QEventDispatcherGlib::processEvents (this=0x18441a0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#58 0x00007f477fe10bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#59 0x00007f477f10400f in QCoreApplication::processEvents (flags=...) at kernel/qcoreapplication.cpp:1140
#60 0x00007f476338d453 in QApt::CacheBuildProgress::Update (this=<optimized out>) at /build/buildd/qapt-2.0.65/src/cache.cpp:34
#61 0x00007f476308bb9b in pkgDepCache::Update(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#62 0x00007f476308bf7c in pkgDepCache::Init(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#63 0x00007f47630b80c0 in pkgCacheFile::BuildDepCache(OpProgress*) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#64 0x00007f47630b8122 in pkgCacheFile::Open(OpProgress*, bool) () from /usr/lib/x86_64-linux-gnu/libapt-pkg.so.4.12
#65 0x00007f476338d3c3 in ReadOnlyOpen (Progress=<optimized out>, this=<optimized out>) at /usr/include/apt-pkg/cachefile.h:68
#66 QApt::Cache::open (this=<optimized out>) at /build/buildd/qapt-2.0.65/src/cache.cpp:79
#67 0x00007f4763388433 in QApt::Backend::reloadCache (this=this@entry=0x20b5900) at /build/buildd/qapt-2.0.65/src/backend.cpp:176
#68 0x00007f476338920e in QApt::Backend::init (this=this@entry=0x20b5900) at /build/buildd/qapt-2.0.65/src/backend.cpp:169
#69 0x00007f4764a93a17 in KCMLocale::KCMLocale (this=0x2ba5f00, parent=<optimized out>, args=...) at ../../../kcontrol/locale/kcmlocale.cpp:81
#70 0x00007f4764aa556b in KPluginFactory::createInstance<KCMLocale, QWidget> (parentWidget=<optimized out>, parent=<optimized out>, args=...) at /usr/include/KDE/../kpluginfactory.h:477
#71 0x00007f477f8e2453 in KPluginFactory::create (this=0x1aee2e0, iface=0x7f4780be3360 <qt_meta_stringdata_KCModule> "KCModule", parentWidget=0x0, parent=0x2b6dc30, args=..., keyword=...) at ../../kdecore/util/kpluginfactory.cpp:203
#72 0x00007f47810d18ce in create<KCModule> (args=..., keyword=..., parent=0x2b6dc30, parentWidget=0x0, this=0x1aee2e0) at ../../kdecore/util/kpluginfactory.h:531
#73 createInstance<KCModule> (error=0x7fff9173a520, args=..., parent=0x2b6dc30, parentWidget=0x0, this=0x1cd41c0) at ../../kdecore/services/kservice.h:573
#74 createInstance<KCModule> (error=0x7fff9173a520, args=..., parent=0x2b6dc30, this=0x1cd41c0) at ../../kdecore/services/kservice.h:550
#75 KCModuleLoader::loadModule (mod=..., report=report@entry=KCModuleLoader::Inline, parent=0x2b6dc30, args=...) at ../../kutils/kcmoduleloader.cpp:89
#76 0x00007f47810d6b1b in KCModuleProxyPrivate::loadModule (this=this@entry=0x2b0b2a0) at ../../kutils/kcmoduleproxy.cpp:107
#77 0x00007f47810d7235 in KCModuleProxy::realModule (this=this@entry=0x2b6dc30) at ../../kutils/kcmoduleproxy.cpp:83
#78 0x00007f47810d7633 in KCModuleProxy::showEvent (this=0x2b6dc30, ev=0x7fff9173ab60) at ../../kutils/kcmoduleproxy.cpp:198
#79 0x00007f477fdbe2a5 in QWidget::event (this=0x2b6dc30, event=0x7fff9173ab60) at kernel/qwidget.cpp:8594
#80 0x00007f477fd6ee2c in QApplicationPrivate::notify_helper (this=this@entry=0x18629f0, receiver=receiver@entry=0x2b6dc30, e=e@entry=0x7fff9173ab60) at kernel/qapplication.cpp:4567
#81 0x00007f477fd754a0 in QApplication::notify (this=this@entry=0x7fff9173c9a0, receiver=receiver@entry=0x2b6dc30, e=e@entry=0x7fff9173ab60) at kernel/qapplication.cpp:4353
#82 0x00007f4780a7baaa in KApplication::notify (this=0x7fff9173c9a0, receiver=0x2b6dc30, event=0x7fff9173ab60) at ../../kdeui/kernel/kapplication.cpp:311
#83 0x00007f477f1004cd in QCoreApplication::notifyInternal (this=0x7fff9173c9a0, receiver=receiver@entry=0x2b6dc30, event=event@entry=0x7fff9173ab60) at kernel/qcoreapplication.cpp:953
#84 0x00007f477fdbba0f in sendEvent (event=0x7fff9173ab60, receiver=0x2b6dc30) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#85 QWidgetPrivate::show_helper (this=0x1d01d70) at kernel/qwidget.cpp:7556
#86 0x00007f477fdbb73c in QWidgetPrivate::show_recursive (this=<optimized out>) at kernel/qwidget.cpp:7427
#87 0x00007f477fdbb87a in QWidgetPrivate::showChildren (this=this@entry=0x2b1ed30, spontaneous=spontaneous@entry=false) at kernel/qwidget.cpp:7864
#88 0x00007f477fdbb90f in QWidgetPrivate::show_helper (this=this@entry=0x2b1ed30) at kernel/qwidget.cpp:7503
#89 0x00007f477fdbd6b4 in QWidget::setVisible (this=0x1869b50, visible=<optimized out>) at kernel/qwidget.cpp:7778
#90 0x00007f477fdbb88e in show (this=0x1869b50) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:497
#91 QWidgetPrivate::showChildren (this=this@entry=0x2b9adb0, spontaneous=spontaneous@entry=false) at kernel/qwidget.cpp:7866
#92 0x00007f477fdbb90f in QWidgetPrivate::show_helper (this=this@entry=0x2b9adb0) at kernel/qwidget.cpp:7503
#93 0x00007f477fdbd6b4 in QWidget::setVisible (this=0x2b37490, visible=<optimized out>) at kernel/qwidget.cpp:7778
#94 0x00007f477fda1462 in show (this=0x2b37490) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:497
#95 QStackedLayout::setCurrentIndex (this=0x1cfd690, index=1) at kernel/qstackedlayout.cpp:313
#96 0x00007f477fda160a in QStackedLayout::setCurrentWidget (this=<optimized out>, widget=widget@entry=0x2b37490) at kernel/qstackedlayout.cpp:368
#97 0x00007f47801b7027 in QStackedWidget::setCurrentWidget (this=<optimized out>, widget=widget@entry=0x2b37490) at widgets/qstackedwidget.cpp:295
#98 0x00007f4780aa788e in KPageViewPrivate::_k_pageSelected (this=0x1cfcd10, index=..., previous=...) at ../../kdeui/paged/kpageview.cpp:235
#99 0x00007f477f114868 in QMetaObject::activate (sender=sender@entry=0x192ada0, m=m@entry=0x7f4780837f90 <QItemSelectionModel::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff9173afe0) at kernel/qobject.cpp:3539
#100 0x00007f47802b7877 in QItemSelectionModel::selectionChanged (this=this@entry=0x192ada0, _t1=..., _t2=...) at .moc/release-shared/moc_qitemselectionmodel.cpp:165
#101 0x00007f47802bced1 in QItemSelectionModel::emitSelectionChanged (this=this@entry=0x192ada0, newSelection=..., oldSelection=...) at itemviews/qitemselectionmodel.cpp:1544
#102 0x00007f47802bd6a3 in QItemSelectionModel::select (this=0x192ada0, selection=..., command=...) at itemviews/qitemselectionmodel.cpp:1110
#103 0x00007f47802b86e8 in QItemSelectionModel::select (this=this@entry=0x192ada0, index=..., command=...) at itemviews/qitemselectionmodel.cpp:985
#104 0x00007f47802b7aa7 in QItemSelectionModel::setCurrentIndex (this=0x192ada0, index=..., command=...) at itemviews/qitemselectionmodel.cpp:1174
#105 0x00007f4780aa6a2e in KPageViewPrivate::_k_rebuildGui (this=0x1cfcd10) at ../../kdeui/paged/kpageview.cpp:70
#106 0x00007f4780aa74e5 in KPageViewPrivate::_k_modelChanged (this=0x1cfcd10) at ../../kdeui/paged/kpageview.cpp:190
#107 0x00007f477f114868 in QMetaObject::activate (sender=sender@entry=0x1cfd250, m=m@entry=0x7f477f464630 <QAbstractItemModel::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#108 0x00007f477f15e563 in QAbstractItemModel::layoutChanged (this=this@entry=0x1cfd250) at .moc/release-shared/moc_qabstractitemmodel.cpp:176
#109 0x00007f4780aac1b9 in KPageWidgetModel::addPage (this=0x1cfd250, item=item@entry=0x2144c60) at ../../kdeui/paged/kpagewidgetmodel.cpp:401
#110 0x00007f4780aaaa4d in KPageWidget::addPage (this=<optimized out>, item=item@entry=0x2144c60) at ../../kdeui/paged/kpagewidget.cpp:87
#111 0x00007f4780eb0975 in ModuleView::addModule (this=this@entry=0x1cfc330, module=0x1cbf818) at ../../../systemsettings/core/ModuleView.cpp:191
#112 0x00007f4780eb0c25 in ModuleView::loadModule (this=0x1cfc330, menuItem=...) at ../../../systemsettings/core/ModuleView.cpp:144
#113 0x00007f4765330758 in IconMode::changeModule (this=0x1cf9d50, activeModule=...) at ../../../systemsettings/icons/IconMode.cpp:146
#114 0x00007f477f114868 in QMetaObject::activate (sender=sender@entry=0x18394a0, m=m@entry=0x7f4780836580 <QAbstractItemView::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fff9173b7c0) at kernel/qobject.cpp:3539
#115 0x00007f4780266295 in QAbstractItemView::activated (this=this@entry=0x18394a0, _t1=...) at .moc/release-shared/moc_qabstractitemview.cpp:361
#116 0x00007f4780266510 in QAbstractItemView::mouseReleaseEvent (this=this@entry=0x18394a0, event=event@entry=0x7fff9173c150) at itemviews/qabstractitemview.cpp:1821
#117 0x00007f478028f6ee in QListView::mouseReleaseEvent (this=this@entry=0x18394a0, e=e@entry=0x7fff9173c150) at itemviews/qlistview.cpp:799
#118 0x00007f4780a55581 in KCategorizedView::mouseReleaseEvent (this=0x18394a0, event=0x7fff9173c150) at ../../kdeui/itemviews/kcategorizedview.cpp:1047
#119 0x00007f477fdbe50a in QWidget::event (this=this@entry=0x18394a0, event=event@entry=0x7fff9173c150) at kernel/qwidget.cpp:8376
#120 0x00007f478015ffee in QFrame::event (this=0x18394a0, e=0x7fff9173c150) at widgets/qframe.cpp:557
#121 0x00007f478026f5d3 in QAbstractItemView::viewportEvent (this=0x18394a0, event=0x7fff9173c150) at itemviews/qabstractitemview.cpp:1644
#122 0x00007f477f100636 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x18629f0, receiver=receiver@entry=0x1cfca80, event=event@entry=0x7fff9173c150) at kernel/qcoreapplication.cpp:1063
#123 0x00007f477fd6ee0c in QApplicationPrivate::notify_helper (this=this@entry=0x18629f0, receiver=receiver@entry=0x1cfca80, e=e@entry=0x7fff9173c150) at kernel/qapplication.cpp:4563
#124 0x00007f477fd755dd in QApplication::notify (this=this@entry=0x7fff9173c9a0, receiver=receiver@entry=0x1cfca80, e=e@entry=0x7fff9173c150) at kernel/qapplication.cpp:4110
#125 0x00007f4780a7baaa in KApplication::notify (this=0x7fff9173c9a0, receiver=0x1cfca80, event=0x7fff9173c150) at ../../kdeui/kernel/kapplication.cpp:311
#126 0x00007f477f1004cd in QCoreApplication::notifyInternal (this=0x7fff9173c9a0, receiver=receiver@entry=0x1cfca80, event=event@entry=0x7fff9173c150) at kernel/qcoreapplication.cpp:953
#127 0x00007f477fd74d93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#128 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x1cfca80, event=event@entry=0x7fff9173c150, alienWidget=alienWidget@entry=0x1cfca80, nativeWidget=nativeWidget@entry=0x1a3c880, buttonDown=buttonDown@entry=0x7f4780856578 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#129 0x00007f477fde99cb in QETWidget::translateMouseEvent (this=this@entry=0x1a3c880, event=event@entry=0x7fff9173c4d0) at kernel/qapplication_x11.cpp:4634
#130 0x00007f477fde9269 in QApplication::x11ProcessEvent (this=0x7fff9173c9a0, event=event@entry=0x7fff9173c4d0) at kernel/qapplication_x11.cpp:3627
#131 0x00007f477fe10b02 in x11EventSourceDispatch (s=0x1844b70, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#132 0x00007f47778f2b54 in g_main_dispatch (context=0x1853990) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3068
#133 g_main_context_dispatch (context=context@entry=0x1853990) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3643
#134 0x00007f47778f2d98 in g_main_context_iterate (context=context@entry=0x1853990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3714
#135 0x00007f47778f2e3c in g_main_context_iteration (context=0x1853990, may_block=1) at /build/buildd/glib2.0-2.39.3/./glib/gmain.c:3775
#136 0x00007f477f12d815 in QEventDispatcherGlib::processEvents (this=0x18441a0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#137 0x00007f477fe10bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#138 0x00007f477f0ff09f in QEventLoop::processEvents (this=this@entry=0x7fff9173c8a0, flags=...) at kernel/qeventloop.cpp:149
#139 0x00007f477f0ff395 in QEventLoop::exec (this=this@entry=0x7fff9173c8a0, flags=...) at kernel/qeventloop.cpp:204
#140 0x00007f477f104b69 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#141 0x00007f477fd6d37c in QApplication::exec () at kernel/qapplication.cpp:3828
#142 0x000000000040aadb in main (argc=5, argv=0x7fff9173cae8) at ../../../systemsettings/app/main.cpp:49
Totally looks like a qapt bug to be honest.