Application: systemsettings5 (5.2.1)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-9-generic x86_64
Distribution: Ubuntu Vivid Vervet (development branch)

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

I was trying to set the window manager titlebar font to something more compact than the crazy large default, which actually didn't correspond to the default shown in the fonts kcm. I set it to Oxygen-Sans Bold 9pt, and set the anti-aliasing to RGB/Full, and then hit Apply. This crash window was my reward (though the font settings seem to have been applied; we'll see if they stick).

-- 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 0x7f42cf82b780 (LWP 2503))]

Thread 4 (Thread 0x7f42c0681700 (LWP 2504)):
#0  0x00007f42cbf860cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f42cacd4b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f42cacd664f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f42c2bcc049 in QXcbEventReader::run (this=0x210e980) at qxcbconnection.cpp:1105
#4  0x00007f42cc60db0e in QThreadPrivate::start (arg=0x210e980) at thread/qthread_unix.cpp:337
#5  0x00007f42c9bef0a5 in start_thread (arg=0x7f42c0681700) at pthread_create.c:309
#6  0x00007f42cbf9057d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f42b0867700 (LWP 2507)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f42b387c703 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f42b387bf67 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f42c9bef0a5 in start_thread (arg=0x7f42b0867700) at pthread_create.c:309
#4  0x00007f42cbf9057d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f42b0066700 (LWP 2508)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f42b387c703 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2  0x00007f42b387bf67 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3  0x00007f42c9bef0a5 in start_thread (arg=0x7f42b0066700) at pthread_create.c:309
#4  0x00007f42cbf9057d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f42cf82b780 (LWP 2503)):
[KCrash Handler]
#6  0x00007f42aa090fcc in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007f42cf7eb13a in call_init (l=<optimized out>, argc=argc@entry=1, argv=argv@entry=0x7ffd264a1608, env=env@entry=0x2126ab0) at dl-init.c:78
#8  0x00007f42cf7eb223 in call_init (env=<optimized out>, argv=<optimized out>, argc=<optimized out>, l=<optimized out>) at dl-init.c:36
#9  _dl_init (main_map=main_map@entry=0x2916170, argc=1, argv=0x7ffd264a1608, env=0x2126ab0) at dl-init.c:126
#10 0x00007f42cf7efc6e in dl_open_worker (a=a@entry=0x7ffd2649eae8) at dl-open.c:577
#11 0x00007f42cf7eaff4 in _dl_catch_error (objname=objname@entry=0x7ffd2649ead8, errstring=errstring@entry=0x7ffd2649eae0, mallocedp=mallocedp@entry=0x7ffd2649ead0, operate=operate@entry=0x7f42cf7ef990 <dl_open_worker>, args=args@entry=0x7ffd2649eae8) at dl-error.c:187
#12 0x00007f42cf7ef3ab in _dl_open (file=0x269a890 "/usr/lib/vlc/plugins/gui/libqt4_plugin.so", mode=-2147483647, caller_dlopen=<optimized out>, nsid=-2, argc=1, argv=0x7ffd264a1608, env=0x2126ab0) at dl-open.c:661
#13 0x00007f42c7f6102b in dlopen_doit (a=a@entry=0x7ffd2649ed00) at dlopen.c:66
#14 0x00007f42cf7eaff4 in _dl_catch_error (objname=0x20f9d00, errstring=0x20f9d08, mallocedp=0x20f9cf8, operate=0x7f42c7f60fd0 <dlopen_doit>, args=0x7ffd2649ed00) at dl-error.c:187
#15 0x00007f42c7f6162d in _dlerror_run (operate=operate@entry=0x7f42c7f60fd0 <dlopen_doit>, args=args@entry=0x7ffd2649ed00) at dlerror.c:163
#16 0x00007f42c7f610c1 in __dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:87
#17 0x00007f42ab5bc52f in ?? () from /usr/lib/libvlccore.so.8
#18 0x00007f42ab5a11db in ?? () from /usr/lib/libvlccore.so.8
#19 0x00007f42ab5a1508 in ?? () from /usr/lib/libvlccore.so.8
#20 0x00007f42ab5a1464 in ?? () from /usr/lib/libvlccore.so.8
#21 0x00007f42ab5a19e4 in ?? () from /usr/lib/libvlccore.so.8
#22 0x00007f42ab5a1fb1 in ?? () from /usr/lib/libvlccore.so.8
#23 0x00007f42ab527e5d in libvlc_InternalInit () from /usr/lib/libvlccore.so.8
#24 0x00007f42ab2fd35b in libvlc_new () from /usr/lib/libvlc.so.5
#25 0x00007f42ab86e1cb in LibVLC::init () at ../../src/utils/libvlc.cpp:117
#26 0x00007f42ab84b878 in Phonon::VLC::Backend::Backend (this=0x27aa1c0, parent=<optimized out>) at ../../src/backend.cpp:90
#27 0x00007f42ab871fd8 in qt_plugin_instance () at moc_backend.cpp:237
#28 0x00007f42cc834d6f in QPluginLoader::instance (this=0x7ffd2649f620) at plugin/qpluginloader.cpp:192
#29 0x00007f42beddd0e8 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#30 0x00007f42bedded0e in ?? () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#31 0x00007f42beddf641 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#32 0x00007f42beddfebd in Phonon::Factory::backend(bool) () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#33 0x00007f42bede04d3 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#34 0x00007f42bedd5a54 in ?? () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#35 0x00007f42bedd309e in ?? () from /usr/lib/x86_64-linux-gnu/libphonon4qt5.so.4
#36 0x00007f42bf56b153 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#37 0x00007f42bf54fbe2 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#38 0x00007f42bf550821 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#39 0x00007f42bf54d4bd in KNotification::sendEvent() () from /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#40 0x00007f42cc87d70a in QObject::event (this=0x26640b0, e=<optimized out>) at kernel/qobject.cpp:1245
#41 0x00007f42cd636b2c in QApplicationPrivate::notify_helper (this=0x20f5680, receiver=0x26640b0, e=0x2790290) at kernel/qapplication.cpp:3720
#42 0x00007f42cd63c000 in QApplication::notify (this=0x7ffd264a14d0, receiver=0x26640b0, e=0x2790290) at kernel/qapplication.cpp:3503
#43 0x00007f42cc84bbfb in QCoreApplication::notifyInternal (this=0x7ffd264a14d0, receiver=0x26640b0, event=event@entry=0x2790290) at kernel/qcoreapplication.cpp:935
#44 0x00007f42cc84dc6b in sendEvent (event=0x2790290, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#45 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x20f4db0) at kernel/qcoreapplication.cpp:1552
#46 0x00007f42cc84e268 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#47 0x00007f42cc8a47d3 in postEventSourceDispatch (s=0x2139220) at kernel/qeventdispatcher_glib.cpp:271
#48 0x00007f42c96cfc3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#49 0x00007f42c96cff20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#50 0x00007f42c96cffcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007f42cc8a4be7 in QEventDispatcherGlib::processEvents (this=0x21398f0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#52 0x00007f42cc8493b2 in QEventLoop::exec (this=this@entry=0x7ffd264a0110, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#53 0x00007f42cd8384b5 in QDialog::exec (this=0x27ab8c0) at dialogs/qdialog.cpp:541
#54 0x00007f42cdc2d9fc in KMessageBox::createKMessageBox(QDialog*, QDialogButtonBox*, QIcon const&, QString const&, QStringList const&, QString const&, bool*, QFlags<KMessageBox::Option>, QString const&, QMessageBox::Icon) () from /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5
#55 0x00007f42cdc2dca6 in KMessageBox::createKMessageBox(QDialog*, QDialogButtonBox*, QMessageBox::Icon, QString const&, QStringList const&, QString const&, bool*, QFlags<KMessageBox::Option>, QString const&) () from /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5
#56 0x00007f42cdc31a98 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5
#57 0x00007f42cdc31c81 in KMessageBox::information(QWidget*, QString const&, QString const&, QString const&, QFlags<KMessageBox::Option>) () from /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5
#58 0x00007f42acdc123f in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_fonts.so
#59 0x00007f42cf3a1637 in KCModuleProxy::save() () from /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#60 0x00007f42cf5d1c13 in ModuleView::moduleSave(KCModuleProxy*) () from /usr/lib/x86_64-linux-gnu/libsystemsettingsview.so.3
#61 0x00007f42cf5d5585 in ?? () from /usr/lib/x86_64-linux-gnu/libsystemsettingsview.so.3
#62 0x00007f42cc87c999 in QMetaObject::activate (sender=sender@entry=0x23a4100, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffd264a0740) at kernel/qobject.cpp:3716
#63 0x00007f42cc87d027 in QMetaObject::activate (sender=sender@entry=0x23a4100, m=m@entry=0x7f42cdb70a60 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffd264a0740) at kernel/qobject.cpp:3582
#64 0x00007f42cd9e5012 in QAbstractButton::clicked (this=this@entry=0x23a4100, _t1=false) at .moc/moc_qabstractbutton.cpp:298
#65 0x00007f42cd732675 in QAbstractButtonPrivate::emitClicked (this=0x23a48c0) at widgets/qabstractbutton.cpp:534
#66 0x00007f42cd733299 in QAbstractButtonPrivate::click (this=0x23a48c0) at widgets/qabstractbutton.cpp:527
#67 0x00007f42cd733454 in QAbstractButton::mouseReleaseEvent (this=0x23a4100, e=0x7ffd264a0c00) at widgets/qabstractbutton.cpp:1132
#68 0x00007f42cd67a1e8 in QWidget::event (this=0x23a4100, event=0x7ffd264a0c00) at kernel/qwidget.cpp:9022
#69 0x00007f42cd636b2c in QApplicationPrivate::notify_helper (this=0x20f5680, receiver=0x23a4100, e=0x7ffd264a0c00) at kernel/qapplication.cpp:3720
#70 0x00007f42cd63c8eb in QApplication::notify (this=0x7ffd264a0940, receiver=0x7ffd264a0960, e=0x7ffd264a0c00) at kernel/qapplication.cpp:3280
#71 0x00007f42cc84bbfb in QCoreApplication::notifyInternal (this=0x7ffd264a14d0, receiver=receiver@entry=0x23a4100, event=event@entry=0x7ffd264a0c00) at kernel/qcoreapplication.cpp:935
#72 0x00007f42cd63b3da in sendSpontaneousEvent (event=0x7ffd264a0c00, receiver=0x23a4100) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#73 QApplicationPrivate::sendMouseEvent (receiver=0x23a4100, event=0x7ffd264a0c00, alienWidget=0x23a4100, nativeWidget=0x23a3f50, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#74 0x00007f42cd692cc0 in QWidgetWindow::handleMouseEvent (this=0x2574650, event=0x7ffd264a1010) at kernel/qwidgetwindow.cpp:543
#75 0x00007f42cd694e33 in QWidgetWindow::event (this=0x2574650, event=0x7ffd264a1010) at kernel/qwidgetwindow.cpp:210
#76 0x00007f42cd636b2c in QApplicationPrivate::notify_helper (this=0x20f5680, receiver=0x2574650, e=0x7ffd264a1010) at kernel/qapplication.cpp:3720
#77 0x00007f42cd63c000 in QApplication::notify (this=0x7ffd264a14d0, receiver=0x2574650, e=0x7ffd264a1010) at kernel/qapplication.cpp:3503
#78 0x00007f42cc84bbfb in QCoreApplication::notifyInternal (this=0x7ffd264a14d0, receiver=0x2574650, event=0x7ffd264a1010) at kernel/qcoreapplication.cpp:935
#79 0x00007f42cd079f82 in sendSpontaneousEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#80 QGuiApplicationPrivate::processMouseEvent (e=0x27b83a0) at kernel/qguiapplication.cpp:1774
#81 0x00007f42cd07bb45 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x27b83a0) at kernel/qguiapplication.cpp:1576
#82 0x00007f42cd06034f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#83 0x00007f42c2bf64f0 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#84 0x00007f42c96cfc3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#85 0x00007f42c96cff20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#86 0x00007f42c96cffcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#87 0x00007f42cc8a4be7 in QEventDispatcherGlib::processEvents (this=0x21398f0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#88 0x00007f42cc8493b2 in QEventLoop::exec (this=this@entry=0x7ffd264a13b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#89 0x00007f42cc850ffc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#90 0x000000000040eebc in main ()

Reported using DrKonqi