Application: systemsettings5 (5.3.90)
 (Compiled from sources)
Qt Version: 5.4.1
Operating System: Linux 3.19.3-3-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
I removed my "face" image then clicked "apply".
That triggered the crash.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f53902c3800 (LWP 9343))]

Thread 5 (Thread 0x7f538ec40700 (LWP 9344)):
#0  0x00007f539bd824ed in poll () from /usr/lib/libc.so.6
#1  0x00007f53992699f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f539926b56f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f538ff3a399 in ?? () from /usr/lib/qt/plugins/platforms/libqxcb.so
#4  0x00007f539c91356e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f5398c21374 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f539bd8b27d in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7f537dfaa700 (LWP 9568)):
#0  0x00007f539bd841b3 in select () from /usr/lib/libc.so.6
#1  0x00007f539ca91a91 in ?? () from /usr/lib/libQt5Core.so.5
#2  0x00007f539c91356e in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007f5398c21374 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f539bd8b27d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f5376b19700 (LWP 15866)):
#0  0x00007f539bd824ed in poll () from /usr/lib/libc.so.6
#1  0x00007f5397df7c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f5397df8002 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#3  0x00007f536ba19816 in ?? () from /usr/lib/libgio-2.0.so.0
#4  0x00007f5397e1e625 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007f5398c21374 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f539bd8b27d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f53437fe700 (LWP 15893)):
#0  0x00007f539bd86f89 in syscall () from /usr/lib/libc.so.6
#1  0x00007f5397e3c67a in g_cond_wait_until () from /usr/lib/libglib-2.0.so.0
#2  0x00007f5397dcc889 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007f5397dcceab in g_async_queue_timeout_pop () from /usr/lib/libglib-2.0.so.0
#4  0x00007f5397e1f07c in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007f5397e1e625 in ?? () from /usr/lib/libglib-2.0.so.0
#6  0x00007f5398c21374 in start_thread () from /usr/lib/libpthread.so.0
#7  0x00007f539bd8b27d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f53902c3800 (LWP 9343)):
[KCrash Handler]
#6  0x00007f539cb0d24e in QMetaObject::indexOfMethod(char const*) const () from /usr/lib/libQt5Core.so.5
#7  0x00007f539cb0d715 in QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) () from /usr/lib/libQt5Core.so.5
#8  0x00007f539edb9157 in QMetaObject::invokeMethod (obj=0x29ead30, member=0x7f539edcc15b "next", type=Qt::QueuedConnection, val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at /usr/include/qt/QtCore/qobjectdefs.h:391
#9  0x00007f539edb895e in KDialogJobUiDelegate::Private::next (this=0x29ead30) at /home/kde5/src/frameworks/kjobwidgets/src/kdialogjobuidelegate.cpp:82
#10 0x00007f539edb8f29 in KDialogJobUiDelegate::Private::qt_static_metacall (_o=0x29ead30, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x49f98f0) at /home/kde5/build/frameworks/kjobwidgets/src/kdialogjobuidelegate.moc:67
#11 0x00007f539cb3012a in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#12 0x00007f539e067acc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#13 0x00007f539e06cf10 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007f539cafedbb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#15 0x00007f539cb00dfb in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#16 0x00007f539cb56dc3 in ?? () from /usr/lib/libQt5Core.so.5
#17 0x00007f5397df79fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007f5397df7ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007f5397df7d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007f539cb571b7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#21 0x00007f539cafc852 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#22 0x00007f539cb0422c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#23 0x0000000000424aeb in main ()

Reported using DrKonqi