Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-21-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
I clicked on 'Workspace Theme' and the application crashed. It occurred every time that I attempted to do so.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbece1f9780 (LWP 24852))]

Thread 3 (Thread 0x7fbebba23700 (LWP 24853)):
#0  0x00007fbeca95b8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fbec8c75b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fbec8c7764f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fbebe7b6099 in QXcbEventReader::run (this=0x23eb930) at qxcbconnection.cpp:1105
#4  0x00007fbecafdcb0e in QThreadPrivate::start (arg=0x23eb930) at thread/qthread_unix.cpp:337
#5  0x00007fbec7b8f6aa in start_thread (arg=0x7fbebba23700) at pthread_create.c:333
#6  0x00007fbeca966eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fbeaceae700 (LWP 24854)):
#0  0x00007fbeca95b8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fbec7670ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbec7670fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbecb273c6c in QEventDispatcherGlib::processEvents (this=0x7fbea80008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fbecb2183e2 in QEventLoop::exec (this=this@entry=0x7fbeaceade20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fbecafd7b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fbec9fa2f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fbecafdcb0e in QThreadPrivate::start (arg=0x27cc1b0) at thread/qthread_unix.cpp:337
#8  0x00007fbec7b8f6aa in start_thread (arg=0x7fbeaceae700) at pthread_create.c:333
#9  0x00007fbeca966eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fbece1f9780 (LWP 24852)):
[KCrash Handler]
#6  0x00007fbeca895267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
#7  0x00007fbeca896eca in __GI_abort () at abort.c:89
#8  0x00007fbecafc9edf in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1415
#9  QMessageLogger::fatal (this=0x7ffca8fbf270, msg=<optimized out>) at global/qlogging.cpp:636
#10 0x00007fbec9a4a791 in QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fbec9a5406f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fbec9a5430a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007fbecba527b5 in QWindow::event (this=0x27e5eb0, ev=<optimized out>) at kernel/qwindow.cpp:2051
#14 0x00007fbec9a85dd3 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fbecc006b2c in QApplicationPrivate::notify_helper (this=0x23c2550, receiver=0x27e5eb0, e=0x7ffca8fbf6f0) at kernel/qapplication.cpp:3720
#16 0x00007fbecc00c000 in QApplication::notify (this=0x7ffca8fbfaf0, receiver=0x27e5eb0, e=0x7ffca8fbf6f0) at kernel/qapplication.cpp:3503
#17 0x00007fbecb21ac2b in QCoreApplication::notifyInternal (this=0x7ffca8fbfaf0, receiver=receiver@entry=0x27e5eb0, event=event@entry=0x7ffca8fbf6f0) at kernel/qcoreapplication.cpp:935
#18 0x00007fbecba4ae86 in sendSpontaneousEvent (event=0x7ffca8fbf6f0, receiver=0x27e5eb0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#19 QGuiApplicationPrivate::processExposeEvent (e=0x276cb80) at kernel/qguiapplication.cpp:2613
#20 0x00007fbecba4bbbd in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x276cb80) at kernel/qguiapplication.cpp:1638
#21 0x00007fbecba3034f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#22 0x00007fbebe7e0590 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#23 0x00007fbec7670c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fbec7670f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fbec7670fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fbecb273c57 in QEventDispatcherGlib::processEvents (this=0x242d360, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#27 0x00007fbecb2183e2 in QEventLoop::exec (this=this@entry=0x7ffca8fbf9d0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#28 0x00007fbecb22002c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#29 0x00007fbecba4131c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#30 0x00007fbecc0027a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#31 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi