Application: systemsettings5 (5.8.2)

Qt Version: 5.7.0
Frameworks Version: 5.27.0
Operating System: Linux 4.8.4-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed: Attempting to install new fonts using the KDE font manager application

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f7d87955180 (LWP 6573))]

Thread 3 (Thread 0x7f7d6b8e9700 (LWP 6576)):
#0  0x00007f7d7daa4dd4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f7d7da5ec7c in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f7d7da5f6ab in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f7d7da5f89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f7d83f9272b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f7d83f3c23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f7d83d5f0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f7d848a6e55 in  () at /usr/lib/libQt5DBus.so.5
#8  0x00007f7d83d63d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f7d7f744454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f7d836797df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f7d74265700 (LWP 6575)):
#0  0x00007f7d8367048d in poll () at /usr/lib/libc.so.6
#1  0x00007f7d7ffc78e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f7d7ffc9679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f7d763b7449 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f7d83d63d78 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f7d7f744454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f7d836797df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f7d87955180 (LWP 6573)):
[KCrash Handler]
#6  0x00007f7d537d1b94 in  () at /usr/lib/libQtGui.so.4
#7  0x00007f7d8782d4fa in call_init.part () at /lib64/ld-linux-x86-64.so.2
#8  0x00007f7d8782d60b in _dl_init () at /lib64/ld-linux-x86-64.so.2
#9  0x00007f7d87831b38 in dl_open_worker () at /lib64/ld-linux-x86-64.so.2
#10 0x00007f7d8782d3a4 in _dl_catch_error () at /lib64/ld-linux-x86-64.so.2
#11 0x00007f7d878312d9 in _dl_open () at /lib64/ld-linux-x86-64.so.2
#12 0x00007f7d7dd28ee9 in  () at /usr/lib/libdl.so.2
#13 0x00007f7d8782d3a4 in _dl_catch_error () at /lib64/ld-linux-x86-64.so.2
#14 0x00007f7d7dd29521 in  () at /usr/lib/libdl.so.2
#15 0x00007f7d7dd28f82 in dlopen () at /usr/lib/libdl.so.2
#16 0x00007f7d6036fbb0 in  () at /usr/lib/libvlccore.so.8
#17 0x00007f7d60353ebb in  () at /usr/lib/libvlccore.so.8
#18 0x00007f7d603541e8 in  () at /usr/lib/libvlccore.so.8
#19 0x00007f7d60354144 in  () at /usr/lib/libvlccore.so.8
#20 0x00007f7d603546c4 in  () at /usr/lib/libvlccore.so.8
#21 0x00007f7d60354cca in  () at /usr/lib/libvlccore.so.8
#22 0x00007f7d602daeb1 in libvlc_InternalInit () at /usr/lib/libvlccore.so.8
#23 0x00007f7d600abcee in libvlc_new () at /usr/lib/libvlc.so.5
#24 0x00007f7d6060c2c8 in  () at /usr/lib/qt5/plugins/phonon4qt5_backend/phonon_vlc.so
#25 0x00007f7d605e1586 in  () at /usr/lib/qt5/plugins/phonon4qt5_backend/phonon_vlc.so
#26 0x00007f7d60610195 in qt_plugin_instance () at /usr/lib/qt5/plugins/phonon4qt5_backend/phonon_vlc.so
#27 0x00007f7d83f26cdb in QPluginLoader::instance() () at /usr/lib/libQt5Core.so.5
#28 0x00007f7d71e66180 in  () at /usr/lib/libphonon4qt5.so.4
#29 0x00007f7d71e68ada in  () at /usr/lib/libphonon4qt5.so.4
#30 0x00007f7d71e69179 in  () at /usr/lib/libphonon4qt5.so.4
#31 0x00007f7d71e69aa4 in Phonon::Factory::backend(bool) () at /usr/lib/libphonon4qt5.so.4
#32 0x00007f7d71e6a339 in  () at /usr/lib/libphonon4qt5.so.4
#33 0x00007f7d71e5e031 in  () at /usr/lib/libphonon4qt5.so.4
#34 0x00007f7d72d147e0 in  () at /usr/lib/libKF5Notifications.so.5
#35 0x00007f7d72cf31c0 in  () at /usr/lib/libKF5Notifications.so.5
#36 0x00007f7d72cef490 in KNotification::sendEvent() () at /usr/lib/libKF5Notifications.so.5
#37 0x00007f7d83f6a4b9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#38 0x00007f7d85acbe0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#39 0x00007f7d85ad3581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#40 0x00007f7d83f3dde0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#41 0x00007f7d83f4056d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#42 0x00007f7d83f92303 in  () at /usr/lib/libQt5Core.so.5
#43 0x00007f7d7da5f587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#44 0x00007f7d7da5f7f0 in  () at /usr/lib/libglib-2.0.so.0
#45 0x00007f7d7da5f89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#46 0x00007f7d83f9270f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#47 0x00007f7d83f3c23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#48 0x00007f7d85cb86b7 in QDialog::exec() () at /usr/lib/libQt5Widgets.so.5
#49 0x00007f7d8629a85b in KMessageBox::createKMessageBox(QDialog*, QDialogButtonBox*, QIcon const&, QString const&, QStringList const&, QString const&, bool*, QFlags<KMessageBox::Option>, QString const&, QMessageBox::Icon) () at /usr/lib/libKF5WidgetsAddons.so.5
#50 0x00007f7d8629b34c in KMessageBox::createKMessageBox(QDialog*, QDialogButtonBox*, QMessageBox::Icon, QString const&, QStringList const&, QString const&, bool*, QFlags<KMessageBox::Option>, QString const&) () at /usr/lib/libKF5WidgetsAddons.so.5
#51 0x00007f7d8629c24f in  () at /usr/lib/libKF5WidgetsAddons.so.5
#52 0x00007f7d61fe5a58 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#53 0x00007f7d61fe6231 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#54 0x00007f7d61ff5245 in  () at /usr/lib/qt/plugins/kcm_fontinst.so
#55 0x00007f7d83f69659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#56 0x00007f7d85bb3102 in QAbstractButton::clicked(bool) () at /usr/lib/libQt5Widgets.so.5
#57 0x00007f7d85bb3354 in  () at /usr/lib/libQt5Widgets.so.5
#58 0x00007f7d85bb4747 in  () at /usr/lib/libQt5Widgets.so.5
#59 0x00007f7d85bb4924 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () at /usr/lib/libQt5Widgets.so.5
#60 0x00007f7d85b12ef8 in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#61 0x00007f7d85acbe0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#62 0x00007f7d85ad443d in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#63 0x00007f7d83f3dde0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#64 0x00007f7d85ad2aed in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /usr/lib/libQt5Widgets.so.5
#65 0x00007f7d85b2cfa0 in  () at /usr/lib/libQt5Widgets.so.5
#66 0x00007f7d85b2f743 in  () at /usr/lib/libQt5Widgets.so.5
#67 0x00007f7d85acbe0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#68 0x00007f7d85ad3581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#69 0x00007f7d83f3dde0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#70 0x00007f7d8533a303 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
#71 0x00007f7d8533be85 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
#72 0x00007f7d85319cab in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
#73 0x00007f7d763ed2f0 in  () at /usr/lib/libQt5XcbQpa.so.5
#74 0x00007f7d7da5f587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#75 0x00007f7d7da5f7f0 in  () at /usr/lib/libglib-2.0.so.0
#76 0x00007f7d7da5f89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#77 0x00007f7d83f9270f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#78 0x00007f7d83f3c23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#79 0x00007f7d83f4473c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#80 0x000000000040c0b0 in  ()
#81 0x00007f7d835b1291 in __libc_start_main () at /usr/lib/libc.so.6
#82 0x000000000040c12a in _start ()

Reported using DrKonqi