Application: systemsettings5 (5.9.5)
 (Compiled from sources)
Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.10.0-40-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:
I had just downloaded and installed a new theme from the system dialogs and menus. Upon applying the theme the System Settings application crashed. I installed the Arc KDE theme.

-- 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 0x7f79cf6e2900 (LWP 20500))]

Thread 8 (Thread 0x7f797f7fe700 (LWP 22434)):
#0  0x00007f79cbb70d99 in QMutex::lock() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f79cbd9c82f in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f79c5568a6d in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f79c556949b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f79cbd9d0bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f79cbb74f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f79c9ebfdf5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f79c776a6da in start_thread (arg=0x7f797f7fe700) at pthread_create.c:456
#11 0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f794f7fe700 (LWP 21656)):
#0  0x00007f79cb47ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f79c5569576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f79cbd9d0bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f79cbb74f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f79c776a6da in start_thread (arg=0x7f794f7fe700) at pthread_create.c:456
#8  0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f7971506700 (LWP 21653)):
#0  0x00007f79cb47ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f79c5569576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f79cbd9d0bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f79cbb74f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f79c776a6da in start_thread (arg=0x7f7971506700) at pthread_create.c:456
#8  0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f799ac87700 (LWP 20564)):
#0  0x00007f79cb47ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f79c5569576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f79cbd9d0bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f79cbb74f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f79c9ebfdf5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f79c776a6da in start_thread (arg=0x7f799ac87700) at pthread_create.c:456
#9  0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f79a4f81700 (LWP 20562)):
#0  0x00007f79c55aeed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f79c5568450 in g_main_context_acquire () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f79c5569425 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f79cbd9d0bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f79cbb74f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f79c9ebfdf5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f79c776a6da in start_thread (arg=0x7f79a4f81700) at pthread_create.c:456
#10 0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f79b295c700 (LWP 20503)):
#0  0x00007f79cb47ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f79c5569576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f79cbd9d0bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f79cbb74f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f79cc6a05d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f79c776a6da in start_thread (arg=0x7f79b295c700) at pthread_create.c:456
#9  0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f79bb547700 (LWP 20502)):
#0  0x00007f79cb47ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f79c7fe1c62 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f79c7fe38d7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f79be0d1ef9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f79cbb79c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f79c776a6da in start_thread (arg=0x7f79bb547700) at pthread_create.c:456
#6  0x00007f79cb486d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f79cf6e2900 (LWP 20500)):
[KCrash Handler]
#6  0x00007f79cf15ca39 in  () at /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#7  0x00007f79cbd74afe in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f79cd109825 in QGuiApplication::paletteChanged(QPalette const&) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007f79ba0d24a5 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#10 0x00007f79ba0df315 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#11 0x00007f79cc6aa570 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#12 0x00007f79cbd75639 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f79cd8a635c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007f79cd8adb21 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007f79cbd48c00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f79cbd4b39d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f79cbd9cc93 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f79c5569377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f79c55695e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f79c556968c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f79cbd9d09f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f79cbd46bea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f79cbd4f33c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x000055d686bf132a in  ()
#25 0x00007f79cb39e3f1 in __libc_start_main (main=0x55d686bf0f50, argc=1, argv=0x7ffe1b4360a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe1b436098) at ../csu/libc-start.c:291
#26 0x000055d686bf13aa in _start ()

Reported using DrKonqi