Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I just went to minimize kontact and the taskbar crashed. 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 7706)]

Thread 2 (Thread 0x7f961f9e8950 (LWP 7709)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f963fdacd19 in QWaitCondition::wait (this=0x1796b20, mutex=0x1796b18, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f963ec3281c in QHostInfoAgent::run (this=0x1796b00) at kernel/qhostinfo.cpp:260
#3  0x00007f963fdabd35 in QThreadPrivate::start (arg=0x1796b00) at thread/qthread_unix.cpp:188
#4  0x00007f963bca03ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f963c884fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9640366750 (LWP 7706)):
[KCrash Handler]
#5  0x00007f963d9faad4 in QGraphicsItem::isWidget (this=0x26a7c50) at graphicsview/qgraphicsitem.cpp:1142
#6  0x00007f963d9fd279 in QGraphicsItem::isWindow (this=0x26a7c50) at graphicsview/qgraphicsitem.cpp:1156
#7  0x00007f963da33df1 in QGraphicsScene::event (this=0x115b220, event=0x7fff483a3ff0) at graphicsview/qgraphicsscene.cpp:3850
#8  0x00007f963d45bf4d in QApplicationPrivate::notify_helper (this=0x1036a70, receiver=0x115b220, e=0x7fff483a5070) at kernel/qapplication.cpp:4056
#9  0x00007f963d46418a in QApplication::notify (this=0x102b1d0, receiver=0x115b220, e=0x7fff483a5070) at kernel/qapplication.cpp:4021
#10 0x00007f963e56edeb in KApplication::notify (this=0x102b1d0, receiver=0x115b220, event=0x7fff483a5070) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#11 0x00007f963fe956ac in QCoreApplication::notifyInternal (this=0x102b1d0, receiver=0x115b220, event=0x7fff483a5070) at kernel/qcoreapplication.cpp:610
#12 0x00007f963da443d6 in QGraphicsView::viewportEvent (this=0x1a736d0, event=0x7fff483a5070) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#13 0x00007f963fe949b8 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x14fed70, event=0x7fff483a5070) at kernel/qcoreapplication.cpp:726
#14 0x00007f963d45bf1c in QApplicationPrivate::notify_helper (this=0x1036a70, receiver=0x14fed70, e=0x7fff483a5070) at kernel/qapplication.cpp:4052
#15 0x00007f963d46418a in QApplication::notify (this=0x102b1d0, receiver=0x14fed70, e=0x7fff483a5070) at kernel/qapplication.cpp:4021
#16 0x00007f963e56edeb in KApplication::notify (this=0x102b1d0, receiver=0x14fed70, event=0x7fff483a5070) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#17 0x00007f963fe956ac in QCoreApplication::notifyInternal (this=0x102b1d0, receiver=0x14fed70, event=0x7fff483a5070) at kernel/qcoreapplication.cpp:610
#18 0x00007f963d4ad22a in QWidget::event (this=0x1a736d0, event=0x7fff483a5070) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#19 0x00007f963d81ff0b in QFrame::event (this=0x1a736d0, e=0x7fff483a5070) at widgets/qframe.cpp:559
#20 0x00007f963d8b1639 in QAbstractScrollArea::event (this=0x1a736d0, e=0x7fff483a5070) at widgets/qabstractscrollarea.cpp:918
#21 0x00007f963d45bf4d in QApplicationPrivate::notify_helper (this=0x1036a70, receiver=0x1a736d0, e=0x7fff483a5070) at kernel/qapplication.cpp:4056
#22 0x00007f963d46418a in QApplication::notify (this=0x102b1d0, receiver=0x1a736d0, e=0x7fff483a5070) at kernel/qapplication.cpp:4021
#23 0x00007f963e56edeb in KApplication::notify (this=0x102b1d0, receiver=0x1a736d0, event=0x7fff483a5070) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#24 0x00007f963fe956ac in QCoreApplication::notifyInternal (this=0x102b1d0, receiver=0x1a736d0, event=0x7fff483a5070) at kernel/qcoreapplication.cpp:610
#25 0x00007f963d462cb8 in QApplication::setActiveWindow (act=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#26 0x00007f963d4cd26f in QApplication::x11ProcessEvent (this=0x102b1d0, event=0x7fff483a69a0) at kernel/qapplication_x11.cpp:3529
#27 0x00007f963d4f5454 in x11EventSourceDispatch (s=0x1038860, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007f963beef20a in IA__g_main_context_dispatch (context=0x10374e0) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#29 0x00007f963bef28e0 in g_main_context_iterate (context=0x10374e0, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#30 0x00007f963bef2a7c in IA__g_main_context_iteration (context=0x10374e0, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#31 0x00007f963febea8f in QEventDispatcherGlib::processEvents (this=0x1036090, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#32 0x00007f963d4f4bdf in QGuiEventDispatcherGlib::processEvents (this=0x26a7c50, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f963fe93f42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1211788432}) at kernel/qeventloop.cpp:149
#34 0x00007f963fe94314 in QEventLoop::exec (this=0x7fff483a6cd0, flags={i = 1211788512}) at kernel/qeventloop.cpp:201
#35 0x00007f963fe965e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x00007f9633eb53eb in kdemain (argc=1, argv=0x1010aa0) at /build/buildd/kdebase-workspace-4.3.1/plasma/shells/desktop/main.cpp:50
#37 0x0000000000407215 in launch (argc=1, _name=0x100aaa8 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x100aac8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a3a1 "0") at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:677
#38 0x0000000000407a38 in handle_launcher_request (sock=8, who=<value optimized out>) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1169
#39 0x0000000000407fe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1362
#40 0x0000000000408b26 in main (argc=2, argv=0x7fff483a7b78, envp=0x7fff483a7b90) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 200847

Reported using DrKonqi