Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-26-generic x86_64
Distribution: Ubuntu 15.04

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

Run "System Settings" from the KDE Application Launcher ("Launcher to start applications"). Choose "Appearance" / "Application Style" and finally click "Window Decorations". Badaboom. I tried three times, and always crashes.

- Unusual behavior I noticed:

Earlier, after several "graphics resets" , I had what seemed like old style window manager crash - Windows were without decorations and all over the place (virtual desktops collapsed to a single desktop) without possiblity to control them. To get control back, I switched to virtual console, and run "(DISPLAY=:0.0 kwin_x11) &" from the terminal. I do not know if this is the correct thing to run in the newest KDE, but it  did  bring window frames, title bars and other decorations back and I could once again control the application windows. The only annoying problem was that the windows title bar text was unconfortably huge, which felt me feel like I am treated like a semi blind 100 years old grandpa. So off I went to fix the situation using System Settings, hence the crash and this report.

I am running Kubuntu 15.04 (which presents to me various kind of KDE related stability issues).

The crash can be reproduced every time.

-- 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 0x7fb4b327f780 (LWP 904))]

Thread 4 (Thread 0x7fb4b099b700 (LWP 905)):
#0  0x00007fb4bd9da8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fb4bbcf4b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb4bbcf664f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb4b2ee6099 in QXcbEventReader::run (this=0x1f4f680) at qxcbconnection.cpp:1105
#4  0x00007fb4be05bb0e in QThreadPrivate::start (arg=0x1f4f680) at thread/qthread_unix.cpp:337
#5  0x00007fb4bac0e6aa in start_thread (arg=0x7fb4b099b700) at pthread_create.c:333
#6  0x00007fb4bd9e5eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fb47effd700 (LWP 1323)):
#0  0x00007fb4bd9d649d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fb4ba7332f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb4ba6ef96c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb4ba6efe60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb4ba6effcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb4be2f2c6c in QEventDispatcherGlib::processEvents (this=0x7fb4880009e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#6  0x00007fb4be2973e2 in QEventLoop::exec (this=this@entry=0x7fb47effce20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007fb4be056b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007fb4bd021f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fb4be05bb0e in QThreadPrivate::start (arg=0x6ff91f0) at thread/qthread_unix.cpp:337
#10 0x00007fb4bac0e6aa in start_thread (arg=0x7fb47effd700) at pthread_create.c:333
#11 0x00007fb4bd9e5eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fb48e69b700 (LWP 1324)):
#0  0x00007fb4bd9da8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fb4ba6efebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb4ba6effcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb4be2f2c6c in QEventDispatcherGlib::processEvents (this=0x7fb480001a50, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fb4be2973e2 in QEventLoop::exec (this=this@entry=0x7fb48e69ae20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fb4be056b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fb4bd021f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fb4be05bb0e in QThreadPrivate::start (arg=0x498a200) at thread/qthread_unix.cpp:337
#8  0x00007fb4bac0e6aa in start_thread (arg=0x7fb48e69b700) at pthread_create.c:333
#9  0x00007fb4bd9e5eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fb4b327f780 (LWP 904)):
[KCrash Handler]
#6  0x00007fb4939a66b7 in KDecoration2::Decoration::update(QRect const&) () from /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#7  0x00007fb4939a675b in KDecoration2::Decoration::update() () from /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
#8  0x00007fb490243370 in Breeze::Decoration::setOpacity (this=this@entry=0x4921d60, value=<optimized out>) at ../../kdecoration/breezedecoration.cpp:92
#9  0x00007fb4902637a8 in Breeze::Decoration::qt_metacall (this=0x4921d60, _c=QMetaObject::WriteProperty, _id=0, _a=0x7ffc29eb7610) at moc_breezedecoration.cpp:146
#10 0x00007fb4be03c5ca in updateProperty (newValue=..., this=0x4932a00) at animation/qpropertyanimation.cpp:135
#11 QPropertyAnimation::updateCurrentValue (this=<optimized out>, value=...) at animation/qpropertyanimation.cpp:242
#12 0x00007fb4be037f48 in QVariantAnimationPrivate::setCurrentValueForProgress (this=this@entry=0x4932a00, progress=progress@entry=0.96079999999999999) at animation/qvariantanimation.cpp:290
#13 0x00007fb4be038d1b in recalculateCurrentInterval (force=false, this=0x4932a00) at animation/qvariantanimation.cpp:275
#14 QVariantAnimation::updateCurrentTime (this=<optimized out>) at animation/qvariantanimation.cpp:693
#15 0x00007fb4be034baf in QAbstractAnimation::setCurrentTime (this=0x4913f60, msecs=129) at animation/qabstractanimation.cpp:1321
#16 0x00007fb4be034e96 in updateAnimationsTime (delta=21, this=0x21be030) at animation/qabstractanimation.cpp:606
#17 QUnifiedTimer::updateAnimationTimers (this=0x20e5670) at animation/qabstractanimation.cpp:323
#18 0x00007fb4bd05ca5e in QAbstractAnimationJob::setState(QAbstractAnimationJob::State) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007fb4bcb79dac in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007fb4bcbd4244 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fb4bcb82ea3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007fb4bcae51ae in QQuickItem::setWidth(double) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#24 0x00007fb4bcaf1be6 in QQuickItem::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#25 0x00007fb4bcf9bba7 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 0x00007fb4bd01051c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#27 0x00007fb4bd010c7e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#28 0x00007fb4bcfea497 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#29 0x00007fb4bcfea45e in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#30 0x00007fb4bcf8710c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#31 0x00007fb4be2ca141 in QMetaObject::activate (sender=0x47c9a30, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3603
#32 0x00007fb4bcae0e39 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#33 0x00007fb4bcb78edc in QQuickFlickable::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#34 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#35 0x00007fb4bcadba8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#36 0x00007fb4bcadd9a2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#37 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#38 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#39 0x00007fb4bcadba8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#40 0x00007fb4bcadd9a2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#41 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#42 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#43 0x00007fb4bcadba8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#44 0x00007fb4bcadd9a2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#45 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#46 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#47 0x00007fb4bcadba8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#48 0x00007fb4bcadd9a2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#49 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#50 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#51 0x00007fb4bcadba8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#52 0x00007fb4bcadd9a2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#53 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#54 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#55 0x00007fb493879798 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#56 0x00007fb4beda5186 in QGridLayoutEngine::setGeometries (this=0x47c30d8, contentsGeometry=..., styleInfo=<optimized out>) at util/qgridlayoutengine.cpp:1015
#57 0x00007fb493878f0f in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#58 0x00007fb4938794c7 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Layouts/libqquicklayoutsplugin.so
#59 0x00007fb4bcae5c60 in QQuickItem::setSize(QSizeF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#60 0x00007fb4bcadba8a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#61 0x00007fb4bcadd9a2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#62 0x00007fb4bcae0dd3 in QQuickItem::geometryChanged(QRectF const&, QRectF const&) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#63 0x00007fb4bcae54fe in QQuickItem::setHeight(double) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#64 0x00007fb4bcbabd8f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#65 0x00007fb4bcbad442 in QQuickView::resizeEvent(QResizeEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#66 0x00007fb4bead17b5 in QWindow::event (this=0x6bf7340, ev=<optimized out>) at kernel/qwindow.cpp:2051
#67 0x00007fb4bcb04dd3 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#68 0x00007fb4bf085b2c in QApplicationPrivate::notify_helper (this=0x1f38b10, receiver=0x6bf7340, e=0x7ffc29eb9020) at kernel/qapplication.cpp:3720
#69 0x00007fb4bf08b000 in QApplication::notify (this=0x7ffc29eb9420, receiver=0x6bf7340, e=0x7ffc29eb9020) at kernel/qapplication.cpp:3503
#70 0x00007fb4be299c2b in QCoreApplication::notifyInternal (this=0x7ffc29eb9420, receiver=receiver@entry=0x6bf7340, event=event@entry=0x7ffc29eb9020) at kernel/qcoreapplication.cpp:935
#71 0x00007fb4beac9f41 in sendSpontaneousEvent (event=0x7ffc29eb9020, receiver=0x6bf7340) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#72 QGuiApplicationPrivate::processExposeEvent (e=0x496c040) at kernel/qguiapplication.cpp:2602
#73 0x00007fb4beacabbd in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x496c040) at kernel/qguiapplication.cpp:1638
#74 0x00007fb4beaaf34f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#75 0x00007fb4b2f10590 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#76 0x00007fb4ba6efc3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#77 0x00007fb4ba6eff20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#78 0x00007fb4ba6effcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#79 0x00007fb4be2f2c57 in QEventDispatcherGlib::processEvents (this=0x1f754d0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#80 0x00007fb4be2973e2 in QEventLoop::exec (this=this@entry=0x7ffc29eb9300, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#81 0x00007fb4be29f02c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#82 0x00007fb4beac031c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#83 0x00007fb4bf0817a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#84 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi