Application: systemsettings5 (5.3.0)
 (Compiled from sources)
Qt Version: 5.4.2
Operating System: Linux 3.17.8-300.fc21.x86_64 x86_64
Distribution: "Fedora release 22 (Twenty Two)"

-- Information about the crash:
- What I was doing when the application crashed:
I was changing the settings of the trackpad/mouse, the computer didn't recognized the trackpad and I disconected the mouse, then it crashed.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbcb5a9f840 (LWP 15813))]

Thread 3 (Thread 0x7fbcae069700 (LWP 15814)):
#0  0x00000036daaf666d in poll () from /lib64/libc.so.6
#1  0x00000036dc20a182 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00000036dc20bd07 in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fbcaf1587d9 in QXcbEventReader::run() () from /usr/lib64/qt5/plugins/platforms/libqxcb.so
#4  0x00000036e969fe3e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00000036dae07555 in start_thread () from /lib64/libpthread.so.0
#6  0x00000036dab01f3d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fbc8b7fc700 (LWP 15830)):
#0  0x00000036daaf666d in poll () from /lib64/libc.so.6
#1  0x000000370e80f58c in linux_udev_event_thread_main () from /lib64/libusb-1.0.so.0
#2  0x00000036dae07555 in start_thread () from /lib64/libpthread.so.0
#3  0x00000036dab01f3d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fbcb5a9f840 (LWP 15813)):
[KCrash Handler]
#5  0x00000036dc20bb5c in xcb_wait_for_reply () from /lib64/libxcb.so.1
#6  0x00007fbca368df1c in XcbAtom::atom() () from /usr/lib64/qt5/plugins/kded_touchpad.so
#7  0x00007fbca368ef4d in XlibBackend::findTouchpad(XcbAtom&) () from /usr/lib64/qt5/plugins/kded_touchpad.so
#8  0x00007fbca368f3b1 in XlibBackend::devicePlugged(int) () from /usr/lib64/qt5/plugins/kded_touchpad.so
#9  0x00000036e98b007a in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#10 0x00007fbca369a224 in XlibNotifications::processEvent(_XEvent*) [clone .part.0] [clone .constprop.2] () from /usr/lib64/qt5/plugins/kded_touchpad.so
#11 0x00007fbca369a37d in XlibNotifications::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib64/qt5/plugins/kded_touchpad.so
#12 0x00000036e98b007a in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#13 0x00000036e992930e in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) () from /lib64/libQt5Core.so.5
#14 0x00000036e98bc66b in QSocketNotifier::event(QEvent*) () from /lib64/libQt5Core.so.5
#15 0x00000036f335277c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#16 0x00000036f3357e20 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#17 0x00000036e987f67b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#18 0x00000036e98d703d in socketNotifierSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#19 0x00000036dda49a8a in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#20 0x00000036dda49e20 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#21 0x00000036dda49ecc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#22 0x00000036e98d6b8b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#23 0x00000036e987ceba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#24 0x00000036e9884a2c in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#25 0x000000000040eb2c in main ()

Reported using DrKonqi