Application: plasma-desktop (4.11.8)
KDE Platform Version: 4.13.0
Qt Version: 4.8.6
Operating System: Linux 3.13.0-24-generic x86_64
Distribution: Ubuntu 14.04 LTS

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

Trying to add the quick launcher to the bottom panel.

The crash happens about 4/5 times.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f0c7ed317c0 (LWP 2022))]

Thread 4 (Thread 0x7f0c54dc0700 (LWP 2024)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0c779d2ffb in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f0c779d3039 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f0c7227f182 in start_thread (arg=0x7f0c54dc0700) at pthread_create.c:312
#4  0x00007f0c7e62030d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f0bceda8700 (LWP 2025)):
#0  0x00007f0c7e6116bd in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f0c71baec20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0c71b6db14 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0c71b6df7b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0c71b6e0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0c7b1e87be in QEventDispatcherGlib::processEvents (this=0x7f0bc80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#6  0x00007f0c7b1ba0af in QEventLoop::processEvents (this=this@entry=0x7f0bceda7de0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f0c7b1ba3a5 in QEventLoop::exec (this=this@entry=0x7f0bceda7de0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007f0c7b0b6c5f in QThread::exec (this=this@entry=0x17836e0) at thread/qthread.cpp:537
#9  0x00007f0c7b19b823 in QInotifyFileSystemWatcherEngine::run (this=0x17836e0) at io/qfilesystemwatcher_inotify.cpp:265
#10 0x00007f0c7b0b932f in QThreadPrivate::start (arg=0x17836e0) at thread/qthread_unix.cpp:349
#11 0x00007f0c7227f182 in start_thread (arg=0x7f0bceda8700) at pthread_create.c:312
#12 0x00007f0c7e62030d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f0bcd618700 (LWP 2026)):
#0  0x00007f0c71baf62a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f0c71baf9b9 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0c71b6df91 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0c71b6e0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0c7b1e87be in QEventDispatcherGlib::processEvents (this=0x7f0bc00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#5  0x00007f0c7b1ba0af in QEventLoop::processEvents (this=this@entry=0x7f0bcd617de0, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f0c7b1ba3a5 in QEventLoop::exec (this=this@entry=0x7f0bcd617de0, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007f0c7b0b6c5f in QThread::exec (this=this@entry=0x1090130) at thread/qthread.cpp:537
#8  0x00007f0c7b19b823 in QInotifyFileSystemWatcherEngine::run (this=0x1090130) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x00007f0c7b0b932f in QThreadPrivate::start (arg=0x1090130) at thread/qthread_unix.cpp:349
#10 0x00007f0c7227f182 in start_thread (arg=0x7f0bcd618700) at pthread_create.c:312
#11 0x00007f0c7e62030d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f0c7ed317c0 (LWP 2022)):
[KCrash Handler]
#6  indexOfMethodRelative<4> (normalizeStringData=<optimized out>, method=0x7f0c7e293b4f "destroyed(QObject*)", baseObject=0x7fff29a31e00) at kernel/qmetaobject.cpp:525
#7  QMetaObjectPrivate::indexOfSignalRelative (baseObject=baseObject@entry=0x7fff29a31e00, signal=signal@entry=0x7f0c7e293b4f "destroyed(QObject*)", normalizeStringData=normalizeStringData@entry=false) at kernel/qmetaobject.cpp:628
#8  0x00007f0c7b1d09c4 in QObject::connect (sender=sender@entry=0x14d2530, signal=0x7f0c7e293b4f "destroyed(QObject*)", signal@entry=0x7f0c7e293b4e "2destroyed(QObject*)", receiver=receiver@entry=0xd0a750, method=method@entry=0x7f0c7e2a5607 "1onWidgetDestroyed(QObject*)", type=type@entry=Qt::AutoConnection) at kernel/qobject.cpp:2549
#9  0x00007f0c7e1d4eeb in Plasma::ToolTipManager::registerWidget (this=this@entry=0xd0a750, widget=widget@entry=0x14d2530) at ../../plasma/tooltipmanager.cpp:209
#10 0x00007f0c7e1d504b in Plasma::ToolTipManager::setContent (this=0xd0a750, widget=widget@entry=0x14d2530, data=...) at ../../plasma/tooltipmanager.cpp:235
#11 0x00007f0c5616733a in ToolTipProxy::updateToolTip (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/support/tooltip.cpp:252
#12 0x00007f0c7b1cf87a in QMetaObject::activate (sender=sender@entry=0x19ab520, m=m@entry=0x7f0c5636cd00 <ToolTipProxy::staticMetaObject>, local_signal_index=local_signal_index@entry=5, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#13 0x00007f0c56167897 in highlightWindowsChanged (this=0x19ab520) at ./tooltip.moc:209
#14 setHighlightWindows (highlight=<optimized out>, this=0x19ab520) at ../../../../../plasma/desktop/applets/tasks/support/tooltip.cpp:193
#15 ToolTipProxy::qt_metacall (this=0x19ab520, _c=QMetaObject::WriteProperty, _id=5, _a=0x7fff29a322e0) at ./tooltip.moc:156
#16 0x00007f0c7ce0ccd9 in QDeclarativeVMEMetaObject::metaCall (this=0x3f08e70, c=QMetaObject::WriteProperty, _id=6, a=0x7fff29a322e0) at qml/qdeclarativevmemetaobject.cpp:673
#17 0x00007f0c7ce8158e in QDeclarativeCompiledBindingsPrivate::run (this=this@entry=0x1752ca0, instrIndex=<optimized out>, context=0x46e17c0, error=error@entry=0x1bf4420, scope=0x19ab520, output=0x19ab520, storeFlags=...) at qml/qdeclarativecompiledbindings.cpp:1540
#18 0x00007f0c7ce822c7 in QDeclarativeCompiledBindingsPrivate::run (this=this@entry=0x1752ca0, binding=0x1bf43e0, flags=...) at qml/qdeclarativecompiledbindings.cpp:428
#19 0x00007f0c7ce82520 in QDeclarativeCompiledBindings::qt_metacall (this=<optimized out>, c=<optimized out>, id=<optimized out>) at qml/qdeclarativecompiledbindings.cpp:380
#20 0x00007f0c7b1cfa78 in QMetaObject::activate (sender=0x1891ec0, m=<optimized out>, local_signal_index=<optimized out>, argv=argv@entry=0x0) at kernel/qobject.cpp:3569
#21 0x00007f0c7b1d0223 in QMetaObject::activate (sender=<optimized out>, signal_index=<optimized out>, argv=argv@entry=0x0) at kernel/qobject.cpp:3626
#22 0x00007f0c7ce0d07e in QDeclarativeVMEMetaObject::metaCall (this=0x38bd920, c=QMetaObject::WriteProperty, _id=<optimized out>, a=0x7fff29a329c0) at qml/qdeclarativevmemetaobject.cpp:564
#23 0x00007f0c7b1c5496 in QMetaProperty::write (this=this@entry=0x7fff29a32a40, object=object@entry=0x1891ec0, value=...) at kernel/qmetaobject.cpp:2364
#24 0x00007f0c7b1d53bf in QObject::setProperty (this=0x1891ec0, name=name@entry=0x7f0c56167d33 "highlightWindows", value=...) at kernel/qobject.cpp:3728
#25 0x00007f0c56161335 in Tasks::configChanged (this=0x42a7480) at ../../../../../plasma/desktop/applets/tasks/tasks.cpp:454
#26 0x00007f0c7e1154e8 in Plasma::AppletPrivate::configDialogFinished (this=0x130c400) at ../../plasma/applet.cpp:2152
#27 0x00007f0c7e115949 in Plasma::Applet::qt_static_metacall (_o=0x7fff29a31e00, _id=2116631375, _a=0x0, _c=<optimized out>) at ./applet.moc:198
#28 0x00007f0c7b1cf87a in QMetaObject::activate (sender=sender@entry=0xc3c300, m=m@entry=0x7f0c7c27f3e0 <KDialog::staticMetaObject>, local_signal_index=local_signal_index@entry=7, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#29 0x00007f0c7bde26f3 in KDialog::applyClicked (this=this@entry=0xc3c300) at ./kdialog.moc:259
#30 0x00007f0c7bde2d46 in KDialog::slotButtonClicked (this=0xc3c300, button=8) at ../../kdeui/dialogs/kdialog.cpp:888
#31 0x00007f0c7bde46bf in KDialog::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at ./kdialog.moc:166
#32 0x00007f0c7b1cf87a in QMetaObject::activate (sender=sender@entry=0x1d9e480, m=m@entry=0x7f0c7b51cd60 <QSignalMapper::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff29a32ea0) at kernel/qobject.cpp:3539
#33 0x00007f0c7b1d6fbe in QSignalMapper::mapped (this=this@entry=0x1d9e480, _t1=8) at .moc/release-shared/moc_qsignalmapper.cpp:114
#34 0x00007f0c7b1d70c6 in QSignalMapper::map (this=0x1d9e480, sender=0x348c2d0) at kernel/qsignalmapper.cpp:266
#35 0x00007f0c7b1cf87a in QMetaObject::activate (sender=sender@entry=0x348c2d0, m=m@entry=0x7f0c7b0282a0 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff29a33010) at kernel/qobject.cpp:3539
#36 0x00007f0c7aba30d2 in QAbstractButton::clicked (this=this@entry=0x348c2d0, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:219
#37 0x00007f0c7a9069d3 in QAbstractButtonPrivate::emitClicked (this=this@entry=0x10e5f60) at widgets/qabstractbutton.cpp:548
#38 0x00007f0c7a907b43 in QAbstractButtonPrivate::click (this=this@entry=0x10e5f60) at widgets/qabstractbutton.cpp:541
#39 0x00007f0c7a907c2c in QAbstractButton::mouseReleaseEvent (this=0x348c2d0, e=0x7fff29a33500) at widgets/qabstractbutton.cpp:1123
#40 0x00007f0c7a5a450a in QWidget::event (this=0x348c2d0, event=0x7fff29a33500) at kernel/qwidget.cpp:8376
#41 0x00007f0c7a554e2c in QApplicationPrivate::notify_helper (this=this@entry=0xbaa860, receiver=receiver@entry=0x348c2d0, e=e@entry=0x7fff29a33500) at kernel/qapplication.cpp:4567
#42 0x00007f0c7a55b5dd in QApplication::notify (this=this@entry=0xb8d6c0, receiver=receiver@entry=0x348c2d0, e=e@entry=0x7fff29a33500) at kernel/qapplication.cpp:4110
#43 0x00007f0c7be80baa in KApplication::notify (this=0xb8d6c0, receiver=0x348c2d0, event=0x7fff29a33500) at ../../kdeui/kernel/kapplication.cpp:311
#44 0x00007f0c7b1bb4dd in QCoreApplication::notifyInternal (this=0xb8d6c0, receiver=receiver@entry=0x348c2d0, event=event@entry=0x7fff29a33500) at kernel/qcoreapplication.cpp:953
#45 0x00007f0c7a55ad93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#46 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x348c2d0, event=event@entry=0x7fff29a33500, alienWidget=alienWidget@entry=0x348c2d0, nativeWidget=nativeWidget@entry=0xc3c300, buttonDown=buttonDown@entry=0x7f0c7b03a318 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#47 0x00007f0c7a5cf9cb in QETWidget::translateMouseEvent (this=this@entry=0xc3c300, event=event@entry=0x7fff29a33880) at kernel/qapplication_x11.cpp:4634
#48 0x00007f0c7a5cf269 in QApplication::x11ProcessEvent (this=0xb8d6c0, event=event@entry=0x7fff29a33880) at kernel/qapplication_x11.cpp:3627
#49 0x00007f0c7a5f6b02 in x11EventSourceDispatch (s=0xba4030, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#50 0x00007f0c71b6de04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007f0c71b6e048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#52 0x00007f0c71b6e0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#53 0x00007f0c7b1e87a1 in QEventDispatcherGlib::processEvents (this=0xb1faf0, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#54 0x00007f0c7a5f6bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#55 0x00007f0c7b1ba0af in QEventLoop::processEvents (this=this@entry=0x7fff29a33c50, flags=...) at kernel/qeventloop.cpp:149
#56 0x00007f0c7b1ba3a5 in QEventLoop::exec (this=this@entry=0x7fff29a33c50, flags=...) at kernel/qeventloop.cpp:204
#57 0x00007f0c7b1bfb79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#58 0x00007f0c7a55337c in QApplication::exec () at kernel/qapplication.cpp:3828
#59 0x00007f0c7e92766c in kdemain (argc=1, argv=0x7fff29a33ea8) at ../../../../plasma/desktop/shell/main.cpp:126
#60 0x00007f0c7e546ec5 in __libc_start_main (main=0x4006e0 <main(int, char**)>, argc=1, argv=0x7fff29a33ea8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff29a33e98) at libc-start.c:287
#61 0x000000000040070e in _start ()

Possible duplicates by query: bug 324112.

Reported using DrKonqi