Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I installed the System Monitor plasmoid. I was able to add "panes" to the popup display by clicking on the icons at the top of the pane, but when I clicked on the icons again in an attempt to remove panes, plasma crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3396)]

Thread 2 (Thread 0xa0b40b90 (LWP 22288)):
#0  0xb8011430 in __kernel_vsyscall ()
#1  0xb65230e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67032ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e0a172 in QWaitCondition::wait (this=0xb395050, mutex=0xb39504c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb7746ac2 in QHostInfoAgent::run (this=0xb395040) at kernel/qhostinfo.cpp:260
#5  0xb7e09132 in QThreadPrivate::start (arg=0xb395040) at thread/qthread_unix.cpp:188
#6  0xb651f4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb66f449e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb602ca10 (LWP 3396)):
[KCrash Handler]
#6  Plasma::Containment::containmentType (this=0xb7317c0) at /build/buildd/kde4libs-4.3.2/plasma/containment.cpp:417
#7  0x9e439323 in SystemMonitor::removeApplet (this=0xb0aa448, name=@0xbfa29758) at /build/buildd/kdebase-workspace-4.3.2/plasma/applets/system-monitor/system-monitor.cpp:156
#8  0x9e43a94a in SystemMonitor::toggled (this=0xb0aa448, toggled=false) at /build/buildd/kdebase-workspace-4.3.2/plasma/applets/system-monitor/system-monitor.cpp:108
#9  0x9e43aa85 in SystemMonitor::qt_metacall (this=0xb0aa448, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xbfa2985c)
    at /build/buildd/kdebase-workspace-4.3.2/obj-i486-linux-gnu/plasma/applets/system-monitor/system-monitor.moc:72
#10 0xb7f131b8 in QMetaObject::activate (sender=0xb7467f8, from_signal_index=8, to_signal_index=8, argv=0xbfa2985c) at kernel/qobject.cpp:3113
#11 0xb7f13e42 in QMetaObject::activate (sender=0xb7467f8, m=0xb5efd5dc, local_signal_index=1, argv=0xbfa2985c) at kernel/qobject.cpp:3187
#12 0xb5e40449 in Plasma::PushButton::toggled (this=0xb7467f8, _t1=false) at /build/buildd/kde4libs-4.3.2/obj-i486-linux-gnu/plasma/pushbutton.moc:140
#13 0xb5e41cb0 in Plasma::PushButton::qt_metacall (this=0xb7467f8, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xbfa299ac) at /build/buildd/kde4libs-4.3.2/obj-i486-linux-gnu/plasma/pushbutton.moc:85
#14 0x9e43bc5a in MonitorButton::qt_metacall (this=0xb7467f8, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfa299ac)
    at /build/buildd/kdebase-workspace-4.3.2/obj-i486-linux-gnu/plasma/applets/system-monitor/monitorbutton.moc:67
#15 0xb7f131b8 in QMetaObject::activate (sender=0xb5f3f48, from_signal_index=31, to_signal_index=31, argv=0xbfa299ac) at kernel/qobject.cpp:3113
#16 0xb7f13e42 in QMetaObject::activate (sender=0xb5f3f48, m=0xb72340a4, local_signal_index=4, argv=0xbfa299ac) at kernel/qobject.cpp:3187
#17 0xb704aeb9 in QAbstractButton::toggled (this=0xb5f3f48, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:207
#18 0xb6d74385 in QAbstractButton::setChecked (this=0xb5f3f48, checked=false) at widgets/qabstractbutton.cpp:763
#19 0xb6d74560 in QAbstractButton::nextCheckState (this=0xb5f3f48) at widgets/qabstractbutton.cpp:1017
#20 0xb6d74003 in QAbstractButtonPrivate::click (this=0xb6d44c0) at widgets/qabstractbutton.cpp:525
#21 0xb6d742d6 in QAbstractButton::mouseReleaseEvent (this=0xb5f3f48, e=0xba4d118) at widgets/qabstractbutton.cpp:1115
#22 0xb6a10973 in QWidget::event (this=0xb5f3f48, event=0xba4d118) at kernel/qwidget.cpp:7549
#23 0xb6d7228e in QAbstractButton::event (this=0xb5f3f48, e=0xba4d118) at widgets/qabstractbutton.cpp:1077
#24 0xb6e1d050 in QPushButton::event (this=0xb5f3f48, e=0xba4d118) at widgets/qpushbutton.cpp:662
#25 0xb69b9d3c in QApplicationPrivate::notify_helper (this=0x99f0ae0, receiver=0xb5f3f48, e=0xba4d118) at kernel/qapplication.cpp:4056
#26 0xb69c29b1 in QApplication::notify (this=0x99eb068, receiver=0xb5f3f48, e=0xba4d118) at kernel/qapplication.cpp:3758
#27 0xb74ca49d in KApplication::notify (this=0x99eb068, receiver=0xb5f3f48, event=0xba4d118) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#28 0xb7efdbcb in QCoreApplication::notifyInternal (this=0x99eb068, receiver=0xb5f3f48, event=0xba4d118) at kernel/qcoreapplication.cpp:610
#29 0xb69c1a1e in QApplicationPrivate::sendMouseEvent (receiver=0xb5f3f48, event=0xba4d118, alienWidget=0x0, nativeWidget=0xb5f3f48, buttonDown=0xbfa29fcc, lastMouseReceiver=@0xb76aee4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#30 0xb702bb51 in QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent (this=0xb76ad88, event=0xbfa2a5e4) at graphicsview/qgraphicsproxywidget.cpp:278
#31 0xb6fc7144 in QGraphicsItem::sceneEvent (this=0xb746800, event=0xbfa2a5e4) at graphicsview/qgraphicsitem.cpp:5030
#32 0xb701795f in QGraphicsWidget::sceneEvent (this=0xb7467f8, event=0xbfa2a5e4) at graphicsview/qgraphicswidget.cpp:1110
#33 0xb6fec7bc in QGraphicsScenePrivate::sendEvent (this=0x9a9b1f0, item=0xb746800, event=0xbfa2a5e4) at graphicsview/qgraphicsscene.cpp:1159
#34 0xb6fede22 in QGraphicsScenePrivate::sendMouseEvent (this=0x9a9b1f0, mouseEvent=0xbfa2a5e4) at graphicsview/qgraphicsscene.cpp:1230
#35 0xb6ff8431 in QGraphicsScene::mouseReleaseEvent (this=0x9a3f130, mouseEvent=0xbfa2a5e4) at graphicsview/qgraphicsscene.cpp:4445
#36 0xb6ffa08a in QGraphicsScene::event (this=0x9a3f130, event=0xbfa2a5e4) at graphicsview/qgraphicsscene.cpp:3808
#37 0xb69b9d3c in QApplicationPrivate::notify_helper (this=0x99f0ae0, receiver=0x9a3f130, e=0xbfa2a5e4) at kernel/qapplication.cpp:4056
#38 0xb69c203e in QApplication::notify (this=0x99eb068, receiver=0x9a3f130, e=0xbfa2a5e4) at kernel/qapplication.cpp:3603
#39 0xb74ca49d in KApplication::notify (this=0x99eb068, receiver=0x9a3f130, event=0xbfa2a5e4) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#40 0xb7efdbcb in QCoreApplication::notifyInternal (this=0x99eb068, receiver=0x9a3f130, event=0xbfa2a5e4) at kernel/qcoreapplication.cpp:610
#41 0xb700c712 in QGraphicsView::mouseReleaseEvent (this=0xb6c7da8, event=0xbfa2abe8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#42 0xb6a10973 in QWidget::event (this=0xb6c7da8, event=0xbfa2abe8) at kernel/qwidget.cpp:7549
#43 0xb6dc1a53 in QFrame::event (this=0xb6c7da8, e=0xbfa2abe8) at widgets/qframe.cpp:559
#44 0xb6e61c2f in QAbstractScrollArea::viewportEvent (this=0xb6c7da8, e=0x0) at widgets/qabstractscrollarea.cpp:962
#45 0xb700c9b2 in QGraphicsView::viewportEvent (this=0xb6c7da8, event=0xbfa2abe8) at graphicsview/qgraphicsview.cpp:2919
#46 0xb6e64235 in QAbstractScrollAreaFilter::eventFilter (this=0xae7a320, o=0xae2b468, e=0xbfa2abe8) at widgets/qabstractscrollarea_p.h:100
#47 0xb7efcdea in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x99f0ae0, receiver=0xae2b468, event=0xbfa2abe8) at kernel/qcoreapplication.cpp:726
#48 0xb69b9d1a in QApplicationPrivate::notify_helper (this=0x99f0ae0, receiver=0xae2b468, e=0xbfa2abe8) at kernel/qapplication.cpp:4052
#49 0xb69c29b1 in QApplication::notify (this=0x99eb068, receiver=0xae2b468, e=0xbfa2abe8) at kernel/qapplication.cpp:3758
#50 0xb74ca49d in KApplication::notify (this=0x99eb068, receiver=0xae2b468, event=0xbfa2abe8) at /build/buildd/kde4libs-4.3.2/kdeui/kernel/kapplication.cpp:302
#51 0xb7efdbcb in QCoreApplication::notifyInternal (this=0x99eb068, receiver=0xae2b468, event=0xbfa2abe8) at kernel/qcoreapplication.cpp:610
#52 0xb69c1a1e in QApplicationPrivate::sendMouseEvent (receiver=0xae2b468, event=0xbfa2abe8, alienWidget=0xae2b468, nativeWidget=0xad0b2f0, buttonDown=0xb723baa0, lastMouseReceiver=@0xb723baa4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#53 0xb6a31cce in QETWidget::translateMouseEvent (this=0xad0b2f0, event=0xbfa2c27c) at kernel/qapplication_x11.cpp:4409
#54 0xb6a31085 in QApplication::x11ProcessEvent (this=0x99eb068, event=0xbfa2c27c) at kernel/qapplication_x11.cpp:3428
#55 0xb6a5c37a in x11EventSourceDispatch (s=0x99f3b00, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#56 0xb656cb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#57 0xb65700eb in ?? () from /usr/lib/libglib-2.0.so.0
#58 0xb6570268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#59 0xb7f292f8 in QEventDispatcherGlib::processEvents (this=0x99efe98, flags={i = -1079851976}) at kernel/qeventdispatcher_glib.cpp:327
#60 0xb6a5ba75 in QGuiEventDispatcherGlib::processEvents (this=0x99efe98, flags={i = -1079851928}) at kernel/qguieventdispatcher_glib.cpp:202
#61 0xb7efc1fa in QEventLoop::processEvents (this=0xbfa2c4e0, flags={i = -1079851864}) at kernel/qeventloop.cpp:149
#62 0xb7efc642 in QEventLoop::exec (this=0xbfa2c4e0, flags={i = -1079851800}) at kernel/qeventloop.cpp:201
#63 0xb7efeae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#64 0xb69b9bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#65 0xb4b7d2f0 in kdemain (argc=1, argv=0x99b8c18) at /build/buildd/kdebase-workspace-4.3.2/plasma/shells/desktop/main.cpp:50
#66 0x0804e27d in launch (argc=1, _name=0x9987324 "/usr/bin/plasma-desktop", args=0x998733c "", cwd=0x0, envc=0, envs=0x9987340 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805136d "0") at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:677
#67 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:1169
#68 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:1362
#69 0x0804fbca in main (argc=2, argv=0xbfa2ccd4, envp=0xbfa2cce0) at /build/buildd/kde4libs-4.3.2/kinit/kinit.cpp:1793

Reported using DrKonqi