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 2.6.31-15-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Kwin was disabled while using VirtualBox.

One Day later (Suspend to ram for 12 hours in between) I klicked to the corresponding  notification and plasma crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0x01471e3a in Plasma::ExtenderItem::group (this=0xbfd3fd28) at ../../plasma/extenderitem.cpp:335
#7  0x087bc1f5 in SystemTray::ExtenderTaskBusyWidget::updateTask (this=0x9847e98) at ../../../../plasma/applets/systemtray/core/extendertask.cpp:157
#8  0x087bcc91 in SystemTray::ExtenderTaskBusyWidget::qt_metacall (this=0x9847e98, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfd3fe68) at ./extendertask.moc:69
#9  0x007fb263 in QMetaObject::activate (sender=0x93ca438, from_signal_index=9, to_signal_index=9, argv=0xbfd3fe68) at kernel/qobject.cpp:3113
#10 0x007fbec2 in QMetaObject::activate (sender=0x93ca438, m=0x87fe7ac, local_signal_index=5, argv=0xbfd3fe68) at kernel/qobject.cpp:3187
#11 0x087bd543 in SystemTray::Manager::notificationRemoved (this=0x93ca438, _t1=0x97a6b40) at ./manager.moc:160
#12 0x087be9ff in SystemTray::Manager::qt_metacall (this=0x93ca438, _c=QMetaObject::InvokeMetaMethod, _id=16, _a=0xbfd3ffc8) at ./manager.moc:110
#13 0x007fb263 in QMetaObject::activate (sender=0x97a6b40, from_signal_index=6, to_signal_index=7, argv=0xbfd3ffc8) at kernel/qobject.cpp:3113
#14 0x007fb6d8 in QMetaObject::activate (sender=0x97a6b40, m=0x87fe8dc, from_local_signal_index=2, to_local_signal_index=3, argv=0xbfd3ffc8) at kernel/qobject.cpp:3207
#15 0x087bfc9b in SystemTray::Notification::destroyed (this=0x97a6b40, _t1=0x97a6b40) at ./notification.moc:101
#16 0x087c088b in ~Notification (this=0x97a6b40, __in_chrg=<value optimized out>) at ../../../../plasma/applets/systemtray/core/notification.cpp:63
#17 0x087ced44 in ~DBusNotification (this=0x97a6b40, __in_chrg=<value optimized out>) at ../../../../plasma/applets/systemtray/protocols/notifications/dbusnotification.cpp:38
#18 0x007f4135 in qDeleteInEventHandler (o=0x20) at kernel/qobject.cpp:3815
#19 0x007f562b in QObject::event (this=0x97a6b40, e=0xa1249f8) at kernel/qobject.cpp:1094
#20 0x02b49f54 in QApplicationPrivate::notify_helper (this=0x90cbaf8, receiver=0x97a6b40, e=0xa1249f8) at kernel/qapplication.cpp:4056
#21 0x02b5167c in QApplication::notify (this=0x90a4cd0, receiver=0x97a6b40, e=0xa1249f8) at kernel/qapplication.cpp:3603
#22 0x01197bfa in KApplication::notify (this=0x90a4cd0, receiver=0x97a6b40, event=0xa1249f8) at ../../kdeui/kernel/kapplication.cpp:302
#23 0x007e56cb in QCoreApplication::notifyInternal (this=0x90a4cd0, receiver=0x97a6b40, event=0xa1249f8) at kernel/qcoreapplication.cpp:610
#24 0x007e62b2 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x9055e48) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9055e48) at kernel/qcoreapplication.cpp:1247
#26 0x007e647d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#27 0x008103ff in QCoreApplication::sendPostedEvents (s=0x90cdb10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 postEventSourceDispatch (s=0x90cdb10) at kernel/qeventdispatcher_glib.cpp:210
#29 0x005ece78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0x005f0720 in ?? () from /lib/libglib-2.0.so.0
#31 0x005f0853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0x0081002c in QEventDispatcherGlib::processEvents (this=0x90cb8b8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#33 0x02beabe5 in QGuiEventDispatcherGlib::processEvents (this=0x90cb8b8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x007e3c79 in QEventLoop::processEvents (this=0xbfd40734, flags=) at kernel/qeventloop.cpp:149
#35 0x007e40ca in QEventLoop::exec (this=0xbfd40734, flags=...) at kernel/qeventloop.cpp:201
#36 0x007e653f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x02b49dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#38 0x082c180d in kdemain (argc=1, argv=0x90850a8) at ../../../../plasma/shells/desktop/main.cpp:50
#39 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x906ec68 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#40 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#41 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#42 0x0804fbaf in main (argc=2, argv=0xbfd40f94, envp=0xbfd40fa0) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 215249

Reported using DrKonqi