Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-25-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
Just changing the defaults. Whatever I'm doing with it, it keeps crashing over and over again! :-)
Bye!

The crash can be reproduced sometimes.

-- Backtrace:
Application: Ρυθμίσεις συστήματος (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f609cdcb780 (LWP 1755))]

Thread 3 (Thread 0x7f608aee1700 (LWP 1756)):
#0  0x00007f609952c8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f6097846b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f609784864f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f608dc74099 in QXcbEventReader::run (this=0x20003f0) at qxcbconnection.cpp:1105
#4  0x00007f6099badb0e in QThreadPrivate::start (arg=0x20003f0) at thread/qthread_unix.cpp:337
#5  0x00007f60958ed754 in ?? () from /usr/lib/nvidia-304-updates/libGL.so.1
#6  0x00007f60967606aa in start_thread (arg=0x7f608aee1700) at pthread_create.c:333
#7  0x00007f6099537eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f605affd700 (LWP 1776)):
#0  0x00007f609952c8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f6096241ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6096242242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f606cd8aaf6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f6096268955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f60958ed754 in ?? () from /usr/lib/nvidia-304-updates/libGL.so.1
#6  0x00007f60967606aa in start_thread (arg=0x7f605affd700) at pthread_create.c:333
#7  0x00007f6099537eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f609cdcb780 (LWP 1755)):
[KCrash Handler]
#6  0x00007f6098635d7e in QQuickItemPrivate::addToDirtyList() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f6098635e28 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f6098640045 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f6099e1d73a in QObject::event (this=0x2f3ca90, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f609863eb6b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f609abd7b2c in QApplicationPrivate::notify_helper (this=0x1fd52f0, receiver=0x2f3ca90, e=0x7f604411b760) at kernel/qapplication.cpp:3720
#12 0x00007f609abdd000 in QApplication::notify (this=0x7ffe119d9ad0, receiver=0x2f3ca90, e=0x7f604411b760) at kernel/qapplication.cpp:3503
#13 0x00007f6099debc2b in QCoreApplication::notifyInternal (this=0x7ffe119d9ad0, receiver=0x2f3ca90, event=event@entry=0x7f604411b760) at kernel/qcoreapplication.cpp:935
#14 0x00007f6099dedc9b in sendEvent (event=0x7f604411b760, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#15 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1fd45d0) at kernel/qcoreapplication.cpp:1552
#16 0x00007f6099dee298 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#17 0x00007f6099e44843 in postEventSourceDispatch (s=0x203c630) at kernel/qeventdispatcher_glib.cpp:271
#18 0x00007f6096241c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f6096241f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f6096241fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f6099e44c57 in QEventDispatcherGlib::processEvents (this=0x203c9d0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f6099de93e2 in QEventLoop::exec (this=this@entry=0x7ffe119d99b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f6099df102c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#24 0x00007f609a61231c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#25 0x00007f609abd37a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#26 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi