Application: systemsettings5 (5.3.0)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-15-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:

I was trying to open Desktop effects when system settings crashed.

- Unusual behavior I noticed:

It has happened sometimes, not only with desktop effects, but with another custom options, like Windows decoration, fonts and workspace

- Custom settings of the application:

I hadn't activate any effect yet

The crash can be reproduced sometimes.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8e698cd780 (LWP 13627))]

Thread 6 (Thread 0x7f8e58dc5700 (LWP 13628)):
#0  0x00007f8e660288dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8e64342b72 in _xcb_conn_wait (__timeout=-1, __nfds=1, __fds=0x7f8e58dc4d40) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007f8e64342b72 in _xcb_conn_wait (c=c@entry=0x7455e0, cond=cond@entry=0x745620, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:447
#3  0x00007f8e6434464f in xcb_wait_for_event (c=0x7455e0) at ../../src/xcb_in.c:622
#4  0x00007f8e5b310099 in QXcbEventReader::run() (this=0x74f630) at qxcbconnection.cpp:1105
#5  0x00007f8e666a9b0e in QThreadPrivate::start(void*) (arg=0x74f630) at thread/qthread_unix.cpp:337
#6  0x00007f8e6325c6aa in start_thread (arg=0x7f8e58dc5700) at pthread_create.c:333
#7  0x00007f8e66033eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f8e491d9700 (LWP 14604)):
#0  0x00007f8e660288dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8e62d3debc in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f8e44003070, timeout=-1, context=0x7f8e44000990) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4103
#2  0x00007f8e62d3debc in g_main_context_iterate (context=context@entry=0x7f8e44000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3803
#3  0x00007f8e62d3dfcc in g_main_context_iteration (context=0x7f8e44000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#4  0x00007f8e66940c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f8e440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f8e668e53e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f8e491d8e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f8e666a4b44 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f8e6566ff65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f8e666a9b0e in QThreadPrivate::start(void*) (arg=0x118e010) at thread/qthread_unix.cpp:337
#9  0x00007f8e6325c6aa in start_thread (arg=0x7f8e491d9700) at pthread_create.c:333
#10 0x00007f8e66033eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f8e37fff700 (LWP 14610)):
#0  0x00007f8e6602449d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8e62d812f0 in g_wakeup_acknowledge (__nbytes=16, __buf=0x7f8e37ffec30, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007f8e62d812f0 in g_wakeup_acknowledge (wakeup=0x7f8e38002390) at /build/buildd/glib2.0-2.44.0/./glib/gwakeup.c:210
#3  0x00007f8e62d3d96c in g_main_context_check (context=context@entry=0x7f8e30000990, max_priority=2147483647, fds=fds@entry=0x7f8e30003070, n_fds=n_fds@entry=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3600
#4  0x00007f8e62d3de60 in g_main_context_iterate (context=context@entry=0x7f8e30000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3805
#5  0x00007f8e62d3dfcc in g_main_context_iteration (context=0x7f8e30000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#6  0x00007f8e66940c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f8e300008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#7  0x00007f8e668e53e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f8e37ffee40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007f8e666a4b44 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#9  0x00007f8e666a9b0e in QThreadPrivate::start(void*) (arg=0x309c410) at thread/qthread_unix.cpp:337
#10 0x00007f8e6325c6aa in start_thread (arg=0x7f8e37fff700) at pthread_create.c:333
#11 0x00007f8e66033eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f8e37393700 (LWP 14626)):
#0  0x00007f8e6602449d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8e62d812f0 in g_wakeup_acknowledge (__nbytes=16, __buf=0x7f8e37392c10, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007f8e62d812f0 in g_wakeup_acknowledge (wakeup=0x7f8e30002780) at /build/buildd/glib2.0-2.44.0/./glib/gwakeup.c:210
#3  0x00007f8e62d3d96c in g_main_context_check (context=context@entry=0x7f8e28000990, max_priority=2147483647, fds=fds@entry=0x7f8e28003070, n_fds=n_fds@entry=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3600
#4  0x00007f8e62d3de60 in g_main_context_iterate (context=context@entry=0x7f8e28000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3805
#5  0x00007f8e62d3dfcc in g_main_context_iteration (context=0x7f8e28000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#6  0x00007f8e66940c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f8e280008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#7  0x00007f8e668e53e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f8e37392e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007f8e666a4b44 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#9  0x00007f8e6566ff65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f8e666a9b0e in QThreadPrivate::start(void*) (arg=0x3283e50) at thread/qthread_unix.cpp:337
#11 0x00007f8e6325c6aa in start_thread (arg=0x7f8e37393700) at pthread_create.c:333
#12 0x00007f8e66033eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f8e406a5700 (LWP 14637)):
#0  0x00007f8e666a8a22 in QThreadData::current(bool) (createIfNecessary=createIfNecessary@entry=true) at thread/qthread_unix.cpp:213
#1  0x00007f8e669401ba in postEventSourcePrepare(GSource*, gint*) (s=0x7f8e2c0012d0, timeout=timeout@entry=0x7f8e406a4c54) at kernel/qeventdispatcher_glib.cpp:247
#2  0x00007f8e62d3d3fd in g_main_context_prepare (context=context@entry=0x7f8e2c000990, priority=priority@entry=0x7f8e406a4ce0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3410
#3  0x00007f8e62d3dde8 in g_main_context_iterate (context=context@entry=0x7f8e2c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3788
#4  0x00007f8e62d3dfcc in g_main_context_iteration (context=0x7f8e2c000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#5  0x00007f8e66940c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f8e2c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#6  0x00007f8e668e53e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f8e406a4e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f8e666a4b44 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007f8e6566ff65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f8e666a9b0e in QThreadPrivate::start(void*) (arg=0x333bf70) at thread/qthread_unix.cpp:337
#10 0x00007f8e6325c6aa in start_thread (arg=0x7f8e406a5700) at pthread_create.c:333
#11 0x00007f8e66033eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f8e698cd780 (LWP 13627)):
[KCrash Handler]
#6  0x00007f8e65590f97 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f8e6553b151 in QV4::ExecutionEngine::~ExecutionEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f8e656730d5 in QV8Engine::~QV8Engine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f8e656732b9 in QV8Engine::~QV8Engine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f8e654d8061 in QJSEngine::~QJSEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f8e655d53c5 in QQmlEngine::~QQmlEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f8e655d5499 in QQmlEngine::~QQmlEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007f8e3ee5f242 in Aurorae::Helper::unref() (pointer=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:54
#14 0x00007f8e3ee5f242 in Aurorae::Helper::unref() (other=0x0, this=0x7f8e3f0ee708 <Aurorae::Helper::instance()::s_helper+8>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:149
#15 0x00007f8e3ee5f242 in Aurorae::Helper::unref() (this=0x7f8e3f0ee700 <Aurorae::Helper::instance()::s_helper>) at ../../../../clients/aurorae/src/aurorae.cpp:113
#16 0x00007f8e3ee633f8 in Aurorae::Decoration::~Decoration() (this=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:271
#17 0x00007f8e3ee633f8 in Aurorae::Decoration::~Decoration() (this=0x1c34930, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:266
#18 0x00007f8e3ee63419 in Aurorae::Decoration::~Decoration() (this=0x1c34930, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:277
#19 0x00007f8e66919778 in QObject::event(QEvent*) (this=0x1c34930, e=<optimized out>) at kernel/qobject.cpp:1236
#20 0x00007f8e676d3b2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=0x738b10, receiver=0x1c34930, e=0x256ebe0) at kernel/qapplication.cpp:3720
#21 0x00007f8e676d9000 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd9d4a23d0, receiver=0x1c34930, e=0x256ebe0) at kernel/qapplication.cpp:3503
#22 0x00007f8e668e7c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd9d4a23d0, receiver=0x1c34930, event=event@entry=0x256ebe0) at kernel/qcoreapplication.cpp:935
#23 0x00007f8e668e9c9b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (event=0x256ebe0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#24 0x00007f8e668e9c9b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=0x0, event_type=52, data=0x737d60) at kernel/qcoreapplication.cpp:1552
#25 0x00007f8e65118b6e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#26 0x00007f8e6514a463 in QQuickWindow::~QQuickWindow() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007f8e651f9a49 in QQuickView::~QQuickView() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#28 0x00007f8e67732dd5 in QWindowContainer::~QWindowContainer() (this=0x2b3cbc0, __in_chrg=<optimized out>) at kernel/qwindowcontainer.cpp:219
#29 0x00007f8e67732df9 in QWindowContainer::~QWindowContainer() (this=0x2b3cbc0, __in_chrg=<optimized out>) at kernel/qwindowcontainer.cpp:220
#30 0x00007f8e6691718c in QObjectPrivate::deleteChildren() (this=this@entry=0x2ad3df0) at kernel/qobject.cpp:1950
#31 0x00007f8e6771357a in QWidget::~QWidget() (this=0x2cd2f00, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#32 0x00007f8e677137e9 in QWidget::~QWidget() (this=0x2cd2f00, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1662
#33 0x00007f8e6691718c in QObjectPrivate::deleteChildren() (this=this@entry=0x2c9e6f0) at kernel/qobject.cpp:1950
#34 0x00007f8e6771357a in QWidget::~QWidget() (this=0x1387230, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#35 0x00007f8e40afc4fe in KDecoration2::Configuration::ConfigurationForm::~ConfigurationForm() (this=0x1387230, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:41
#36 0x00007f8e40afc4fe in KDecoration2::Configuration::ConfigurationForm::~ConfigurationForm() (this=0x1387230, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:41
#37 0x00007f8e6691718c in QObjectPrivate::deleteChildren() (this=this@entry=0x13a5f80) at kernel/qobject.cpp:1950
#38 0x00007f8e6771357a in QWidget::~QWidget() (this=0x2c29c50, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#39 0x00007f8e681b81c7 in KCModule::~KCModule() (this=0x2c29c50, __in_chrg=<optimized out>) at ../../src/kcmodule.cpp:177
#40 0x00007f8e40af71a1 in KDecoration2::Configuration::ConfigurationModule::~ConfigurationModule() (this=0x2c29c50, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:47
#41 0x00007f8e40af71a1 in KDecoration2::Configuration::ConfigurationModule::~ConfigurationModule() (this=0x2c29c50, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:47
#42 0x00007f8e694472b4 in KCModuleProxy::deleteClient() (this=this@entry=0x32c5e40) at ../../src/kcmoduleproxy.cpp:217
#43 0x00007f8e694473b6 in KCModuleProxy::~KCModuleProxy() (this=0x32c5e40, __in_chrg=<optimized out>) at ../../src/kcmoduleproxy.cpp:208
#44 0x00007f8e694474c9 in KCModuleProxy::~KCModuleProxy() (this=0x32c5e40, __in_chrg=<optimized out>) at ../../src/kcmoduleproxy.cpp:212
#45 0x00007f8e6691718c in QObjectPrivate::deleteChildren() (this=this@entry=0x32fba10) at kernel/qobject.cpp:1950
#46 0x00007f8e6771357a in QWidget::~QWidget() (this=0x13a4460, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#47 0x00007f8e677137e9 in QWidget::~QWidget() (this=0x13a4460, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1662
#48 0x00007f8e6691718c in QObjectPrivate::deleteChildren() (this=this@entry=0x32fb770) at kernel/qobject.cpp:1950
#49 0x00007f8e6771357a in QWidget::~QWidget() (this=0x2b52d70, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#50 0x00007f8e678a2059 in QScrollArea::~QScrollArea() (this=0x2b52d70, __in_chrg=<optimized out>) at widgets/qscrollarea.cpp:168
#51 0x00007f8e67cfd273 in KPageWidgetItem::~KPageWidgetItem() (this=0x2c32430, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:40
#52 0x00007f8e67cfd273 in KPageWidgetItem::~KPageWidgetItem() (this=0x331a550, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:86
#53 0x00007f8e67cfdc54 in PageItem::~PageItem() (this=0x331a550, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:87
#54 0x00007f8e67cfdc54 in PageItem::~PageItem() (this=0x119ebe0, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:176
#55 0x00007f8e67cfee68 in KPageWidgetModel::removePage(KPageWidgetItem*) (this=0xd62640, item=<optimized out>) at ../../src/kpagewidgetmodel.cpp:537
#56 0x00007f8e67cfcdc7 in KPageWidget::removePage(KPageWidgetItem*) (this=<optimized out>, item=<optimized out>) at ../../src/kpagewidget.cpp:120
#57 0x00007f8e6967a875 in ModuleView::closeModules() (this=0x108fa10) at ../../core/ModuleView.cpp:275
#58 0x00007f8e4a77a5de in IconMode::backToOverview() (this=0x8de9d0) at ../../icons/IconMode.cpp:156
#59 0x00007f8e669189c9 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x1092d60, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffd9d4a1600) at kernel/qobject.cpp:3716
#60 0x00007f8e66919057 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x1092d60, m=m@entry=0x7f8e67beab40 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffd9d4a1600) at kernel/qobject.cpp:3582
#61 0x00007f8e676c9722 in QAction::triggered(bool) (this=this@entry=0x1092d60, _t1=false) at .moc/moc_qaction.cpp:360
#62 0x00007f8e676cbe28 in QAction::activate(QAction::ActionEvent) (this=0x1092d60, event=<optimized out>) at kernel/qaction.cpp:1167
#63 0x00007f8e677d023d in QAbstractButtonPrivate::click() (this=0x110d610) at widgets/qabstractbutton.cpp:516
#64 0x00007f8e677d0454 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) (this=0x110d250, e=0x7ffd9d4a1b00) at widgets/qabstractbutton.cpp:1132
#65 0x00007f8e6789c23a in QToolButton::mouseReleaseEvent(QMouseEvent*) (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:609
#66 0x00007f8e677171e8 in QWidget::event(QEvent*) (this=0x110d250, event=0x7ffd9d4a1b00) at kernel/qwidget.cpp:9022
#67 0x00007f8e677d1773 in QAbstractButton::event(QEvent*) (this=this@entry=0x110d250, e=e@entry=0x7ffd9d4a1b00) at widgets/qabstractbutton.cpp:1089
#68 0x00007f8e6789c319 in QToolButton::event(QEvent*) (this=0x110d250, event=0x7ffd9d4a1b00) at widgets/qtoolbutton.cpp:965
#69 0x00007f8e676d3b2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=0x738b10, receiver=0x110d250, e=0x7ffd9d4a1b00) at kernel/qapplication.cpp:3720
#70 0x00007f8e676d98eb in QApplication::notify(QObject*, QEvent*) (this=0x7ffd9d4a1840, receiver=0x7ffd9d4a1860, e=0x7ffd9d4a1b00) at kernel/qapplication.cpp:3280
#71 0x00007f8e668e7c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd9d4a23d0, receiver=receiver@entry=0x110d250, event=event@entry=0x7ffd9d4a1b00) at kernel/qcoreapplication.cpp:935
#72 0x00007f8e676d83da in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) (event=0x7ffd9d4a1b00, receiver=0x110d250) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#73 0x00007f8e676d83da in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) (receiver=0x110d250, event=0x7ffd9d4a1b00, alienWidget=0x110d250, nativeWidget=0x829ba0, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#74 0x00007f8e6772fcc0 in QWidgetWindow::handleMouseEvent(QMouseEvent*) (this=0x874040, event=0x7ffd9d4a1f10) at kernel/qwidgetwindow.cpp:543
#75 0x00007f8e67731e33 in QWidgetWindow::event(QEvent*) (this=0x874040, event=0x7ffd9d4a1f10) at kernel/qwidgetwindow.cpp:210
#76 0x00007f8e676d3b2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=0x738b10, receiver=0x874040, e=0x7ffd9d4a1f10) at kernel/qapplication.cpp:3720
#77 0x00007f8e676d9000 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd9d4a23d0, receiver=0x874040, e=0x7ffd9d4a1f10) at kernel/qapplication.cpp:3503
#78 0x00007f8e668e7c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd9d4a23d0, receiver=0x874040, event=0x7ffd9d4a1f10) at kernel/qcoreapplication.cpp:935
#79 0x00007f8e67116f82 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#80 0x00007f8e67116f82 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) (e=0x487a880) at kernel/qguiapplication.cpp:1774
#81 0x00007f8e67118b45 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x487a880) at kernel/qguiapplication.cpp:1576
#82 0x00007f8e670fd34f in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:572
#83 0x00007f8e5b33a590 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#84 0x00007f8e62d3dc3d in g_main_context_dispatch (context=0x7f8e540016f0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3122
#85 0x00007f8e62d3dc3d in g_main_context_dispatch (context=context@entry=0x7f8e540016f0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3737
#86 0x00007f8e62d3df20 in g_main_context_iterate (context=context@entry=0x7f8e540016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3808
#87 0x00007f8e62d3dfcc in g_main_context_iteration (context=0x7f8e540016f0, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#88 0x00007f8e66940c57 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7830a0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#89 0x00007f8e668e53e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd9d4a22b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#90 0x00007f8e668ed02c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1188
#91 0x00007f8e6710e31c in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1510
#92 0x00007f8e676cf7a5 in QApplication::exec() () at kernel/qapplication.cpp:2956
#93 0x000000000040ef6b in main(int, char**) (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Reported using DrKonqi