Application: systemsettings5 (5.4.1)
 (Compiled from sources)
Qt Version: 5.4.2
Operating System: Linux 4.2.0-16-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:

The bug is happenning every time I click on the worskpace appearance icon.

The crash can be reproduced every time.

-- Backtrace:
Application: Configuration du système (systemsettings5), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f10235b9800 (LWP 18506))]

Thread 3 (Thread 0x7f101064a700 (LWP 18511)):
#0  0x00007f101fd4c8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f101da5cbd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f101da5e74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f10133e3a39 in QXcbEventReader::run (this=0x2452c90) at qxcbconnection.cpp:1105
#4  0x00007f102043f2be in QThreadPrivate::start (arg=0x2452c90) at thread/qthread_unix.cpp:337
#5  0x00007f101d1e76aa in start_thread (arg=0x7f101064a700) at pthread_create.c:333
#6  0x00007f101fd57eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f10018e9700 (LWP 19187)):
#0  0x00007f101fd4c8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f101ccc81ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f101ccc82fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f102067629b in QEventDispatcherGlib::processEvents (this=0x7f0ffc0008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f102061c75a in QEventLoop::exec (this=this@entry=0x7f10018e8da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f102043a3d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f101edc3f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f102043f2be in QThreadPrivate::start (arg=0x28df630) at thread/qthread_unix.cpp:337
#8  0x00007f101d1e76aa in start_thread (arg=0x7f10018e9700) at pthread_create.c:333
#9  0x00007f101fd57eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f10235b9800 (LWP 18506)):
[KCrash Handler]
#6  0x00007f101fc86267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
#7  0x00007f101fc87eca in __GI_abort () at abort.c:89
#8  0x00007f102042cc88 in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1422
#9  QMessageLogger::fatal (this=<optimized out>, msg=<optimized out>) at global/qlogging.cpp:643
#10 0x00007f101f077511 in QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f101f07f514 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f101f07f93b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007f10214ff7c5 in QWindow::event (this=0x29d4b00, ev=<optimized out>) at kernel/qwindow.cpp:2058
#14 0x00007f101f0affd3 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007f1021aa2b8c in QApplicationPrivate::notify_helper (this=this@entry=0x241fca0, receiver=receiver@entry=0x29d4b00, e=e@entry=0x7ffe27bfbd40) at kernel/qapplication.cpp:3720
#16 0x00007f1021aa8230 in QApplication::notify (this=0x7ffe27bfc120, receiver=0x29d4b00, e=0x7ffe27bfbd40) at kernel/qapplication.cpp:3503
#17 0x00007f102061ef1b in QCoreApplication::notifyInternal (this=0x7ffe27bfc120, receiver=receiver@entry=0x29d4b00, event=event@entry=0x7ffe27bfbd40) at kernel/qcoreapplication.cpp:935
#18 0x00007f10214f8336 in QCoreApplication::sendSpontaneousEvent (event=0x7ffe27bfbd40, receiver=0x29d4b00) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#19 QGuiApplicationPrivate::processExposeEvent (e=0x286c120) at kernel/qguiapplication.cpp:2616
#20 0x00007f10214f907d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x286c120) at kernel/qguiapplication.cpp:1638
#21 0x00007f10214de5b8 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#22 0x00007f1013410250 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#23 0x00007f101ccc7ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f101ccc8250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f101ccc82fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f102067627f in QEventDispatcherGlib::processEvents (this=0x24a42b0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#27 0x00007f102061c75a in QEventLoop::exec (this=this@entry=0x7ffe27bfc000, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#28 0x00007f10206242cc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#29 0x00007f10214ef00c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#30 0x00007f1021a9f025 in QApplication::exec () at kernel/qapplication.cpp:2956
#31 0x000000000040f04b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Possible duplicates by query: bug 353914, bug 353175, bug 353057, bug 352840, bug 352098.

Reported using DrKonqi