Application: systemsettings5 (5.4.1)
 (Compiled from sources)
Qt Version: 5.4.2
Operating System: Linux 4.2.0-16-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:
I was changing window decoration in system setting.
I was switched the decoration from default theme (breeze) to "simple glass" theme

The crash can be reproduced every time.

-- Backtrace:
Application: Impostazioni di sistema (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc3f5336800 (LWP 4178))]

Thread 5 (Thread 0x7fc3e3e9f700 (LWP 4179)):
#0  0x00007fc3f1ac98dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fc3ef7d9bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc3ef7db74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc3e63eda39 in QXcbEventReader::run (this=0xbeda10) at qxcbconnection.cpp:1105
#4  0x00007fc3f21bc2be in QThreadPrivate::start (arg=0xbeda10) at thread/qthread_unix.cpp:337
#5  0x00007fc3eef646aa in start_thread (arg=0x7fc3e3e9f700) at pthread_create.c:333
#6  0x00007fc3f1ad4eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fc3cfcb4700 (LWP 4181)):
#0  0x00007fc3eea89884 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc3eea44a59 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc3eea45167 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc3eea452fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc3f23f329b in QEventDispatcherGlib::processEvents (this=0x7fc3c80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007fc3f239975a in QEventLoop::exec (this=this@entry=0x7fc3cfcb3d80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fc3f21b73d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fc3d1f4e8f7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007fc3f21bc2be in QThreadPrivate::start (arg=0x1030ab0) at thread/qthread_unix.cpp:337
#9  0x00007fc3eef646aa in start_thread (arg=0x7fc3cfcb4700) at pthread_create.c:333
#10 0x00007fc3f1ad4eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fc3ce0f3700 (LWP 4182)):
#0  0x00007fc3eea44baa in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc3eea45190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc3eea452fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc3f23f329b in QEventDispatcherGlib::processEvents (this=0x7fc3c00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007fc3f239975a in QEventLoop::exec (this=this@entry=0x7fc3ce0f2da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fc3f21b73d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fc3f0b40f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fc3f21bc2be in QThreadPrivate::start (arg=0x11de5f0) at thread/qthread_unix.cpp:337
#8  0x00007fc3eef646aa in start_thread (arg=0x7fc3ce0f3700) at pthread_create.c:333
#9  0x00007fc3f1ad4eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fc3c6bef700 (LWP 4183)):
#0  0x00007fc3f1ac5492 in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fc3eea884e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc3eea44cd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc3eea45190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc3eea452fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc3f23f329b in QEventDispatcherGlib::processEvents (this=0x7fc3bc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#6  0x00007fc3f239975a in QEventLoop::exec (this=this@entry=0x7fc3c6beeda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007fc3f21b73d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007fc3f0b40f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fc3f21bc2be in QThreadPrivate::start (arg=0x1439670) at thread/qthread_unix.cpp:337
#10 0x00007fc3eef646aa in start_thread (arg=0x7fc3c6bef700) at pthread_create.c:333
#11 0x00007fc3f1ad4eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fc3f5336800 (LWP 4178)):
[KCrash Handler]
#6  0x0000000000320033 in ?? ()
#7  0x00007fc3ce5ac941 in KDecoration2::Decoration::update(QRect const&) () from /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#8  0x00007fc3ce5ac9bb in KDecoration2::Decoration::update() () from /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#9  0x00007fc3c6ec9b0d in Breeze::Decoration::setOpacity (this=this@entry=0x13e3990, value=<optimized out>) at ../../kdecoration/breezedecoration.cpp:98
#10 0x00007fc3c6ee62b8 in Breeze::Decoration::qt_metacall (this=0x13e3990, _c=QMetaObject::WriteProperty, _id=0, _a=0x7ffde4b4ba00) at moc_breezedecoration.cpp:150
#11 0x00007fc3f219d30a in QPropertyAnimationPrivate::updateProperty (newValue=..., this=0x1405820) at animation/qpropertyanimation.cpp:135
#12 QPropertyAnimation::updateCurrentValue (this=<optimized out>, value=...) at animation/qpropertyanimation.cpp:242
#13 0x00007fc3f2199318 in QVariantAnimationPrivate::setCurrentValueForProgress (this=this@entry=0x1405820, progress=progress@entry=0.93520000000000003) at animation/qvariantanimation.cpp:290
#14 0x00007fc3f2199a17 in QVariantAnimationPrivate::recalculateCurrentInterval (this=0x1405820, force=<optimized out>) at animation/qvariantanimation.cpp:275
#15 0x00007fc3f219642f in QAbstractAnimation::setCurrentTime (this=0x13f60e0, msecs=123) at animation/qabstractanimation.cpp:1321
#16 0x00007fc3f219672d in QAnimationTimer::updateAnimationsTime (delta=27, this=0xcf7e60) at animation/qabstractanimation.cpp:606
#17 QUnifiedTimer::updateAnimationTimers (this=0xdb4fd0) at animation/qabstractanimation.cpp:323
#18 0x00007fc3f0b7a909 in QAbstractAnimationJob::setState(QAbstractAnimationJob::State) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007fc3f0ea1b95 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007fc3f0ef4be4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fc3f0ea9743 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007fc3f0e0f426 in QQuickItem::setWidth(double) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#24 0x00007fc3f0e1b807 in QQuickItem::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#25 0x00007fc3f0abf475 in QQmlPropertyPrivate::writeBinding(QObject*, QQmlPropertyData const&, QQmlContextData*, QQmlJavaScriptExpression*, QV4::ValueRef, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x00007fc3f0b309ec in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#27 0x00007fc3f0b3114e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#28 0x00007fc3f0b0b507 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#29 0x00007fc3f0b0b4ce in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#30 0x00007fc3f0aab0fc in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#31 0x00007fc3f23cc090 in QMetaObject::activate (sender=0x1241f60, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3603
#32 0x00007fc3f0e0b1c8 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#33 0x00007fc3f0ea076c in QQuickFlickable::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#34 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#35 0x00007fc3f0e06096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#36 0x00007fc3f0e07eb2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#37 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#38 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#39 0x00007fc3f0e06096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#40 0x00007fc3f0e07eb2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#41 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#42 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#43 0x00007fc3f0e06096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#44 0x00007fc3f0e07eb2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#45 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#46 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#47 0x00007fc3f0e06096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#48 0x00007fc3f0e07eb2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#49 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#50 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#51 0x00007fc3f0e06096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#52 0x00007fc3f0e07eb2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#53 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#54 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#55 0x00007fc3ccf43d44 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#56 0x00007fc3f354a61a in QGridLayoutEngine::setGeometries (this=0x123a598, contentsGeometry=..., styleInfo=<optimized out>) at util/qgridlayoutengine.cpp:1015
#57 0x00007fc3ccf4319e in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#58 0x00007fc3ccf43a67 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#59 0x00007fc3f0e0ff24 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#60 0x00007fc3f0e06096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#61 0x00007fc3f0e07eb2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#62 0x00007fc3f0e0b13a in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#63 0x00007fc3f0e0f796 in QQuickItem::setHeight(double) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#64 0x00007fc3f0ed0567 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#65 0x00007fc3f0ed1e62 in QQuickView::resizeEvent(QResizeEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#66 0x00007fc3f327c7c5 in QWindow::event (this=0x10c3f70, ev=<optimized out>) at kernel/qwindow.cpp:2058
#67 0x00007fc3f0e2cfd3 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#68 0x00007fc3f381fb8c in QApplicationPrivate::notify_helper (this=this@entry=0xbcf800, receiver=receiver@entry=0x10c3f70, e=e@entry=0x7ffde4b4d5d0) at kernel/qapplication.cpp:3720
#69 0x00007fc3f3825230 in QApplication::notify (this=0x7ffde4b4d9b0, receiver=0x10c3f70, e=0x7ffde4b4d5d0) at kernel/qapplication.cpp:3503
#70 0x00007fc3f239bf1b in QCoreApplication::notifyInternal (this=0x7ffde4b4d9b0, receiver=receiver@entry=0x10c3f70, event=event@entry=0x7ffde4b4d5d0) at kernel/qcoreapplication.cpp:935
#71 0x00007fc3f3275401 in QCoreApplication::sendSpontaneousEvent (event=0x7ffde4b4d5d0, receiver=0x10c3f70) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#72 QGuiApplicationPrivate::processExposeEvent (e=0x1389990) at kernel/qguiapplication.cpp:2605
#73 0x00007fc3f327607d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x1389990) at kernel/qguiapplication.cpp:1638
#74 0x00007fc3f325b5b8 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#75 0x00007fc3e641a250 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#76 0x00007fc3eea44ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#77 0x00007fc3eea45250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#78 0x00007fc3eea452fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#79 0x00007fc3f23f327f in QEventDispatcherGlib::processEvents (this=0xc1ba80, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#80 0x00007fc3f239975a in QEventLoop::exec (this=this@entry=0x7ffde4b4d890, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#81 0x00007fc3f23a12cc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#82 0x00007fc3f326c00c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#83 0x00007fc3f381c025 in QApplication::exec () at kernel/qapplication.cpp:2956
#84 0x000000000040f04b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Possible duplicates by query: bug 355542, bug 355125, bug 354624, bug 354609, bug 354399.

Reported using DrKonqi