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:
I clicked Login Screen (SDDM) under System Settings. It crashes everytime.

- Unusual behavior I noticed:
Selecting the Breeze Dark theme, panel did not change colour, Kmenu icon, system tray icons and time date not visable.

-OS used and hardware
New install of Kubuntu 15.04, updated as of today. Running on an Apple 8,2 Macbook Pro (Early 2011) - intel 2nd gen i7, AMD Whistler [Radeon HD 6640M], 16GB RAM. EFI booting.

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 0x7f8f65422780 (LWP 16977))]

Thread 4 (Thread 0x7f8f55c85700 (LWP 16978)):
#0  0x00007f8f61b838dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8f5fe9db72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f8f5fe9f64f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f8f58a18099 in QXcbEventReader::run (this=0x1ed6f40) at qxcbconnection.cpp:1105
#4  0x00007f8f62204b0e in QThreadPrivate::start (arg=0x1ed6f40) at thread/qthread_unix.cpp:337
#5  0x00007f8f5edb76aa in start_thread (arg=0x7f8f55c85700) at pthread_create.c:333
#6  0x00007f8f61b8eeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f8f424f6700 (LWP 16989)):
#0  0x00007f8f61b838dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8f5e898ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8f5e899242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8f429feaf6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f8f5e8bf955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f8f5edb76aa in start_thread (arg=0x7f8f424f6700) at pthread_create.c:333
#6  0x00007f8f61b8eeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f8f35e37700 (LWP 17432)):
#0  postEventSourcePrepare (s=0x7f8f1c014a90, timeout=0x7f8f35e36c54) at kernel/qeventdispatcher_glib.cpp:248
#1  0x00007f8f5e8983fd in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8f5e898de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8f5e898fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8f6249bc6c in QEventDispatcherGlib::processEvents (this=0x7f8f1c018fb0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f8f624403e2 in QEventLoop::exec (this=this@entry=0x7f8f35e36e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f8f621ffb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f8f611caf65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f8f62204b0e in QThreadPrivate::start (arg=0x2484d90) at thread/qthread_unix.cpp:337
#9  0x00007f8f5edb76aa in start_thread (arg=0x7f8f35e37700) at pthread_create.c:333
#10 0x00007f8f61b8eeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f8f65422780 (LWP 16977)):
[KCrash Handler]
#6  glViewport (height=975, width=<optimized out>, y=0, x=0, this=0x21c6950) at ../../include/QtGui/../../src/gui/opengl/qopenglfunctions.h:1059
#7  QPlatformBackingStore::composeAndFlush (this=this@entry=0x1fcbc90, window=window@entry=0x1ff4920, region=..., offset=..., textures=0x26b2840, context=0x27e9470, translucentBackground=false) at painting/qplatformbackingstore.cpp:241
#8  0x00007f8f58a2ec37 in QXcbBackingStore::composeAndFlush (this=0x1fcbc90, window=0x1ff4920, region=..., offset=..., textures=<optimized out>, context=<optimized out>, translucentBackground=false) at qxcbbackingstore.cpp:340
#9  0x00007f8f63239adb in QWidgetBackingStore::qt_flush (widget=0x1f9fa70, region=..., backingStore=0x7f8f58a2ec20 <QXcbBackingStore::composeAndFlush(QWindow*, QRegion const&, QPoint const&, QPlatformTextureList*, QOpenGLContext*, bool)>, tlw=0x0, tlwOffset=..., widgetTextures=0x26b2840, widgetBackingStore=0x1fcbc90) at kernel/qwidgetbackingstore.cpp:114
#10 0x00007f8f6323a995 in QWidgetBackingStore::flush (this=0x2055360, widget=0x0) at kernel/qwidgetbackingstore.cpp:1245
#11 0x00007f8f6323c150 in endPaint (beginPaintInfo=<optimized out>, backingStore=<optimized out>, cleaned=..., this=<optimized out>) at kernel/qwidgetbackingstore.cpp:335
#12 QWidgetBackingStore::doSync (this=0x0, this@entry=0x2055360) at kernel/qwidgetbackingstore.cpp:1233
#13 0x00007f8f6323c4d9 in QWidgetBackingStore::sync (this=0x2055360) at kernel/qwidgetbackingstore.cpp:1036
#14 0x00007f8f6325d25f in QWidgetPrivate::syncBackingStore (this=0x1f9fba0) at kernel/qwidget.cpp:1886
#15 0x00007f8f63272298 in QWidget::event (this=this@entry=0x1f9fa70, event=event@entry=0x2a73b30) at kernel/qwidget.cpp:8961
#16 0x00007f8f6338752b in QMainWindow::event (this=this@entry=0x1f9fa70, event=event@entry=0x2a73b30) at widgets/qmainwindow.cpp:1495
#17 0x00007f8f643d6737 in KMainWindow::event (this=this@entry=0x1f9fa70, ev=ev@entry=0x2a73b30) at ../../src/kmainwindow.cpp:806
#18 0x00007f8f6440ff85 in KXmlGuiWindow::event (this=0x1f9fa70, ev=0x2a73b30) at ../../src/kxmlguiwindow.cpp:118
#19 0x00007f8f6322eb2c in QApplicationPrivate::notify_helper (this=0x1ebce70, receiver=0x1f9fa70, e=0x2a73b30) at kernel/qapplication.cpp:3720
#20 0x00007f8f63234000 in QApplication::notify (this=0x7ffc5ac9f400, receiver=0x1f9fa70, e=0x2a73b30) at kernel/qapplication.cpp:3503
#21 0x00007f8f62442c2b in QCoreApplication::notifyInternal (this=0x7ffc5ac9f400, receiver=0x1f9fa70, event=event@entry=0x2a73b30) at kernel/qcoreapplication.cpp:935
#22 0x00007f8f62444c9b in sendEvent (event=0x2a73b30, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#23 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1ebc0c0) at kernel/qcoreapplication.cpp:1552
#24 0x00007f8f62445298 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#25 0x00007f8f6249b843 in postEventSourceDispatch (s=0x1f00790) at kernel/qeventdispatcher_glib.cpp:271
#26 0x00007f8f5e898c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f8f5e898f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f8f5e898fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f8f6249bc57 in QEventDispatcherGlib::processEvents (this=0x1f00950, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#30 0x00007f8f624403e2 in QEventLoop::exec (this=this@entry=0x7ffc5ac9f2e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#31 0x00007f8f6244802c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#32 0x00007f8f62c6931c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#33 0x00007f8f6322a7a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#34 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi