Application: systemsettings5 (5.5.4)
 (Compiled from sources)
Qt Version: 5.5.1
Operating System: Linux 4.1.15-8-default x86_64
Distribution: "openSUSE Leap 42.1 (x86_64)"

-- Information about the crash:
I was trying to load fonts into SUSE Leap using the font installer.  Every time I tried to install a collection of fonts, open or true type, I got a message that the font installer backend had crashed and was restarting.

This continued even after logging off and logging back in.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc801f0a780 (LWP 22149))]

Thread 2 (Thread 0x7fc7eecff700 (LWP 22154)):
#0  0x00007fc7fdbe4bbd in poll () from /lib64/libc.so.6
#1  0x00007fc7fa97b422 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007fc7fa97d00f in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007fc7f16c03c9 in QXcbEventReader::run (this=0x1433830) at qxcbconnection.cpp:1229
#4  0x00007fc7fe2e332f in QThreadPrivate::start (arg=0x1433830) at thread/qthread_unix.cpp:331
#5  0x00007fc7fa0f00a4 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fc7fdbecfed in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fc801f0a780 (LWP 22149)):
[KCrash Handler]
#6  0x00007fc7ed36d6a4 in KNotification::flags (this=this@entry=0x24a0f60) at /usr/src/debug/knotifications-5.19.0/src/knotification.cpp:233
#7  0x00007fc7ed38ab27 in NotifyByAudio::onAudioFinished (this=0x1ef1610) at /usr/src/debug/knotifications-5.19.0/src/notifybyaudio.cpp:140
#8  0x00007fc7ed390275 in NotifyByAudio::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /usr/src/debug/knotifications-5.19.0/build/src/moc_notifybyaudio.cpp:83
#9  0x00007fc7fe4eecc6 in QMetaObject::activate (sender=0x17c9220, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=6, argv=argv@entry=0x0) at kernel/qobject.cpp:3713
#10 0x00007fc7fe4ef2e7 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7fc7ecc00500 <Phonon::MediaObject::staticMetaObject>, local_signal_index=local_signal_index@entry=6, argv=argv@entry=0x0) at kernel/qobject.cpp:3578
#11 0x00007fc7ec9c66a3 in Phonon::MediaObject::finished (this=<optimized out>) at /usr/src/debug/phonon-4.8.3/build/phonon/moc_mediaobject.cpp:426
#12 0x00007fc7ec9c8e75 in Phonon::MediaObject::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /usr/src/debug/phonon-4.8.3/build/phonon/moc_mediaobject.cpp:183
#13 0x00007fc7fe4efac6 in QObject::event (this=0x17c9220, e=<optimized out>) at kernel/qobject.cpp:1239
#14 0x00007fc800023e7c in QApplicationPrivate::notify_helper (this=this@entry=0x1401bf0, receiver=receiver@entry=0x17c9220, e=e@entry=0x22d0790) at kernel/qapplication.cpp:3716
#15 0x00007fc800028cc8 in QApplication::notify (this=0x7fff41246be0, receiver=0x17c9220, e=0x22d0790) at kernel/qapplication.cpp:3499
#16 0x00007fc7fe4bee95 in QCoreApplication::notifyInternal (this=0x7fff41246be0, receiver=0x17c9220, event=event@entry=0x22d0790) at kernel/qcoreapplication.cpp:965
#17 0x00007fc7fe4c1057 in sendEvent (event=0x22d0790, receiver=<optimized out>) at kernel/qcoreapplication.h:224
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1401230) at kernel/qcoreapplication.cpp:1593
#19 0x00007fc7fe4c1608 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1451
#20 0x00007fc7fe5168f3 in postEventSourceDispatch (s=0x1487930) at kernel/qeventdispatcher_glib.cpp:271
#21 0x00007fc7f9bcbc84 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#22 0x00007fc7f9bcbed8 in ?? () from /usr/lib64/libglib-2.0.so.0
#23 0x00007fc7f9bcbf7c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#24 0x00007fc7fe515d6c in QEventDispatcherGlib::processEvents (this=0x147ecc0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#25 0x00007fc7de111699 in KFI::CKCmFontInst::addFonts (this=this@entry=0x171a000, src=...) at /usr/src/debug/plasma-desktop-5.5.4/kcms/kfontinst/kcmfontinst/KCmFontInst.cpp:1078
#26 0x00007fc7de1124d1 in KFI::CKCmFontInst::addFonts (this=0x171a000) at /usr/src/debug/plasma-desktop-5.5.4/kcms/kfontinst/kcmfontinst/KCmFontInst.cpp:520
#27 0x00007fc7de11d975 in KFI::CKCmFontInst::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /usr/src/debug/plasma-desktop-5.5.4/build/kcms/kfontinst/kcmfontinst/moc_KCmFontInst.cpp:168
#28 0x00007fc7fe4eecc6 in QMetaObject::activate (sender=sender@entry=0x18c0df0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff41245e20) at kernel/qobject.cpp:3713
#29 0x00007fc7fe4ef2e7 in QMetaObject::activate (sender=sender@entry=0x18c0df0, m=m@entry=0x7fc8007326c0 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff41245e20) at kernel/qobject.cpp:3578
#30 0x00007fc8003a85e2 in QAbstractButton::clicked (this=this@entry=0x18c0df0, _t1=false) at .moc/moc_qabstractbutton.cpp:303
#31 0x00007fc80011d366 in QAbstractButtonPrivate::emitClicked (this=0x184a080) at widgets/qabstractbutton.cpp:534
#32 0x00007fc80011df9e in QAbstractButtonPrivate::click (this=0x184a080) at widgets/qabstractbutton.cpp:527
#33 0x00007fc80011e114 in QAbstractButton::mouseReleaseEvent (this=0x18c0df0, e=0x7fff412462e0) at widgets/qabstractbutton.cpp:1132
#34 0x00007fc8000643a1 in QWidget::event (this=0x18c0df0, event=0x7fff412462e0) at kernel/qwidget.cpp:8681
#35 0x00007fc800023e7c in QApplicationPrivate::notify_helper (this=this@entry=0x1401bf0, receiver=receiver@entry=0x18c0df0, e=e@entry=0x7fff412462e0) at kernel/qapplication.cpp:3716
#36 0x00007fc8000292cb in QApplication::notify (this=<optimized out>, receiver=0x18c0df0, e=0x7fff412462e0) at kernel/qapplication.cpp:3276
#37 0x00007fc7fe4bee95 in QCoreApplication::notifyInternal (this=0x7fff41246be0, receiver=receiver@entry=0x18c0df0, event=event@entry=0x7fff412462e0) at kernel/qcoreapplication.cpp:965
#38 0x00007fc800028191 in sendSpontaneousEvent (event=0x7fff412462e0, receiver=0x18c0df0) at ../../src/corelib/kernel/qcoreapplication.h:227
#39 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x18c0df0, event=event@entry=0x7fff412462e0, alienWidget=alienWidget@entry=0x18c0df0, nativeWidget=0x1b43390, buttonDown=buttonDown@entry=0x7fc8007416a0 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:2770
#40 0x00007fc80007d13b in QWidgetWindow::handleMouseEvent (this=this@entry=0x17cccb0, event=event@entry=0x7fff41246730) at kernel/qwidgetwindow.cpp:555
#41 0x00007fc80007f353 in QWidgetWindow::event (this=0x17cccb0, event=0x7fff41246730) at kernel/qwidgetwindow.cpp:210
#42 0x00007fc800023e7c in QApplicationPrivate::notify_helper (this=this@entry=0x1401bf0, receiver=receiver@entry=0x17cccb0, e=e@entry=0x7fff41246730) at kernel/qapplication.cpp:3716
#43 0x00007fc800028cc8 in QApplication::notify (this=0x7fff41246be0, receiver=0x17cccb0, e=0x7fff41246730) at kernel/qapplication.cpp:3499
#44 0x00007fc7fe4bee95 in QCoreApplication::notifyInternal (this=0x7fff41246be0, receiver=receiver@entry=0x17cccb0, event=event@entry=0x7fff41246730) at kernel/qcoreapplication.cpp:965
#45 0x00007fc7ff88c964 in sendSpontaneousEvent (event=0x7fff41246730, receiver=0x17cccb0) at ../../src/corelib/kernel/qcoreapplication.h:227
#46 QGuiApplicationPrivate::processMouseEvent (e=0x1cb7400) at kernel/qguiapplication.cpp:1791
#47 0x00007fc7ff88e175 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x1cb7400) at kernel/qguiapplication.cpp:1583
#48 0x00007fc7ff873268 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#49 0x00007fc7f16eb200 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#50 0x00007fc7f9bcbc84 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#51 0x00007fc7f9bcbed8 in ?? () from /usr/lib64/libglib-2.0.so.0
#52 0x00007fc7f9bcbf7c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#53 0x00007fc7fe515d6c in QEventDispatcherGlib::processEvents (this=0x147ecc0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#54 0x00007fc7fe4bcd53 in QEventLoop::exec (this=this@entry=0x7fff41246ab0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#55 0x00007fc7fe4c48f6 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#56 0x00007fc7ff8848ec in QGuiApplication::exec () at kernel/qguiapplication.cpp:1529
#57 0x00007fc800020605 in QApplication::exec () at kernel/qapplication.cpp:2976
#58 0x00000000004109af in main (argc=1, argv=<optimized out>) at /usr/src/debug/systemsettings-5.5.4/app/main.cpp:55

Possible duplicates by query: bug 357826, bug 357668, bug 354518, bug 354451, bug 353597.

Reported using DrKonqi