Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
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:
I'm using KDE SC 4.3.4 form the kubuntu packages

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77d7700 (LWP 1496))]

Thread 2 (Thread 0xabb23b70 (LWP 1497)):
#0  0x001f6422 in __kernel_vsyscall ()
#1  0x00200e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0328878d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00281e67 in QWaitConditionPrivate::wait (this=0x9c9e8e8, mutex=0x9c9e8e4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9c9e8e8, mutex=0x9c9e8e4, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x041cb922 in QHostInfoAgent::run (this=0x9c9e8d8) at kernel/qhostinfo.cpp:260
#6  0x00280e32 in QThreadPrivate::start (arg=0x9c9e8d8) at thread/qthread_unix.cpp:188
#7  0x001fc80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x0327b7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb77d7700 (LWP 1496)):
[KCrash Handler]
#6  0x01766e2c in QGraphicsLayoutItem::geometry (this=0xaa9daaad) at graphicsview/qgraphicslayoutitem.cpp:664
#7  0x0176aa4f in QGraphicsWidget::size (this=0xaa9daa9d) at graphicsview/qgraphicswidget.cpp:336
#8  0x05c4c1fa in AbstractTaskItem::basicPreferredSize (this=0xa342018) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:108
#9  0x05c478d9 in TaskItemLayout::maximumRows (this=0x9b68630) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:190
#10 0x05c51744 in TaskGroupItem::optimumCapacity (this=0x9bb4440) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:1233
#11 0x05c42738 in Tasks::adjustGroupingStrategy (this=0x99782d0) at ../../../../plasma/applets/tasks/tasks.cpp:245
#12 0x05c429cc in Tasks::constraintsEvent (this=0x99782d0, constraints=) at ../../../../plasma/applets/tasks/tasks.cpp:169
#13 0x01ab6823 in Plasma::Applet::flushPendingConstraintsEvents (this=0x99782d0) at ../../plasma/applet.cpp:1178
#14 0x01ab6f58 in Plasma::Applet::timerEvent (this=0x99782d0, event=0xbfbb8bc0) at ../../plasma/applet.cpp:2125
#15 0x003813bf in QObject::event (this=0x99782d0, e=0xbfbb8bc0) at kernel/qobject.cpp:1075
#16 0x0176bb64 in QGraphicsWidget::event (this=0x99782d0, event=0xbfbb8bc0) at graphicsview/qgraphicswidget.cpp:1340
#17 0x01112f54 in QApplicationPrivate::notify_helper (this=0x947d918, receiver=0x99782d0, e=0xbfbb8bc0) at kernel/qapplication.cpp:4056
#18 0x0111a67c in QApplication::notify (this=0x9456a88, receiver=0x99782d0, e=0xbfbb8bc0) at kernel/qapplication.cpp:3603
#19 0x007a71aa in KApplication::notify (this=0x9456a88, receiver=0x99782d0, event=0xbfbb8bc0) at ../../kdeui/kernel/kapplication.cpp:302
#20 0x003716cb in QCoreApplication::notifyInternal (this=0x9456a88, receiver=0x99782d0, event=0xbfbb8bc0) at kernel/qcoreapplication.cpp:610
#21 0x0039e7ce in QCoreApplication::sendEvent (this=0x94800cc) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#22 QTimerInfoList::activateTimers (this=0x94800cc) at kernel/qeventdispatcher_unix.cpp:572
#23 0x0039c0e0 in timerSourceDispatch (source=0x9480098) at kernel/qeventdispatcher_glib.cpp:165
#24 0x0016de78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x00171720 in ?? () from /lib/libglib-2.0.so.0
#26 0x00171853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x0039c02c in QEventDispatcherGlib::processEvents (this=0x947d708, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#28 0x011b3be5 in QGuiEventDispatcherGlib::processEvents (this=0x947d708, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x0036fc79 in QEventLoop::processEvents (this=0xbfbb8e84, flags=) at kernel/qeventloop.cpp:149
#30 0x003700ca in QEventLoop::exec (this=0xbfbb8e84, flags=...) at kernel/qeventloop.cpp:201
#31 0x0037253f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#32 0x01112dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#33 0x07adb80d in kdemain (argc=1, argv=0x94041e8) at ../../../../plasma/shells/desktop/main.cpp:50
#34 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x941e090 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#35 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#36 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#37 0x0804fbaf in main (argc=2, argv=0xbfbb96e4, envp=0xbfbb96f0) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi