Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-16-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
In system settings application switching between:
system lookout/programs style/interface (elements) style
and
system lookout/programs style/windows decoration

The crash can be reproduced every time.

-- Backtrace:
Application: Ustawienia systemowe (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9f81a01780 (LWP 4672))]

Thread 4 (Thread 0x7f9f7e78a700 (LWP 4673)):
#0  0x00007f9f8d8f78dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f9f8bc11b72 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f9f8bc1364f in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f9f81577099 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#4  0x00007f9f8df78b0e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f9f8ab2b6aa in start_thread (arg=0x7f9f7e78a700) at pthread_create.c:333
#6  0x00007f9f8d902eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f9f70467700 (LWP 4674)):
#0  0x00007f9f8d8f78dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f9f8a60cebc in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f9f680010e0, timeout=-1, context=0x1a09420) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4103
#2  0x00007f9f8a60cebc in g_main_context_iterate (context=0x1a09420, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3803
#3  0x00007f9f8a60d242 in g_main_loop_run (loop=0x1a093b0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4002
#4  0x00007f9f7c20aae6 in gdbus_shared_thread_func (user_data=0x1a093f0) at /build/buildd/glib2.0-2.44.0/./gio/gdbusprivate.c:274
#5  0x00007f9f8a633955 in g_thread_proxy (data=0x19bfb70) at /build/buildd/glib2.0-2.44.0/./glib/gthread.c:764
#6  0x00007f9f8ab2b6aa in start_thread (arg=0x7f9f70467700) at pthread_create.c:333
#7  0x00007f9f8d902eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f9f6fc66700 (LWP 4675)):
#0  0x00007f9f8d8f78dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f9f8a60cebc in g_main_context_iterate (priority=2147483647, n_fds=2, fds=0x7f9f600008c0, timeout=-1, context=0x1781bb0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4103
#2  0x00007f9f8a60cebc in g_main_context_iterate (context=context@entry=0x1781bb0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3803
#3  0x00007f9f8a60cfcc in g_main_context_iteration (context=0x1781bb0, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#4  0x00007f9f8a60d009 in glib_worker_main (data=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:5618
#5  0x00007f9f8a633955 in g_thread_proxy (data=0x19bfde0) at /build/buildd/glib2.0-2.44.0/./glib/gthread.c:764
#6  0x00007f9f8ab2b6aa in start_thread (arg=0x7f9f6fc66700) at pthread_create.c:333
#7  0x00007f9f8d902eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f9f81a01780 (LWP 4672)):
[KCrash Handler]
#6  0x00007f9f8ce5ff97 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f9f8ce0a151 in QV4::ExecutionEngine::~ExecutionEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f9f8cf420d5 in QV8Engine::~QV8Engine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f9f8cf422b9 in QV8Engine::~QV8Engine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f9f8cda7061 in QJSEngine::~QJSEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f9f8cea43c5 in QQmlEngine::~QQmlEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f9f8cea4499 in QQmlEngine::~QQmlEngine() () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007f9f511dfbe2 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#14 0x00007f9f511e3908 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#15 0x00007f9f511e3929 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kdecoration2/kwin5_aurorae.so
#16 0x00007f9f8e1e8778 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f9f8efa2b2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f9f8efa8000 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f9f8e1b6c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f9f8e1b8c9b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f9f8e20f843 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f9f8a60cc3d in g_main_context_dispatch (context=0x7f9f78001710) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3122
#23 0x00007f9f8a60cc3d in g_main_context_dispatch (context=context@entry=0x7f9f78001710) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3737
#24 0x00007f9f8a60cf20 in g_main_context_iterate (context=context@entry=0x7f9f78001710, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3808
#25 0x00007f9f8a60cfcc in g_main_context_iteration (context=0x7f9f78001710, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#26 0x00007f9f8e20fc57 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f9f8e1b43e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f9f8e1bc02c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x000000000040eebc in main ()

Reported using DrKonqi