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 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I just have click to chnage the current desktop, and plasma has crashed. I am not sure it is related to the change itself. It  looks like a random crash of plasma.

 -- Backtrace:
Application: Espace de travail Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77e5700 (LWP 3211))]

Thread 2 (Thread 0xab65ab70 (LWP 3214)):
#0  0x00e6f422 in __kernel_vsyscall ()
#1  0x00d3ce15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x041db78d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0051ae67 in QWaitConditionPrivate::wait (this=0x8a1cf20, mutex=0x8a1cf1c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8a1cf20, mutex=0x8a1cf1c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x044a4922 in QHostInfoAgent::run (this=0x8a1cf10) at kernel/qhostinfo.cpp:260
#6  0x00519e32 in QThreadPrivate::start (arg=0x8a1cf10) at thread/qthread_unix.cpp:188
#7  0x00d3880e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x041ce7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb77e5700 (LWP 3211)):
[KCrash Handler]
#6  0x015e4e2c in QGraphicsLayoutItem::geometry (this=0x730077) at graphicsview/qgraphicslayoutitem.cpp:664
#7  0x015e8a4f in QGraphicsWidget::size (this=0x730067) at graphicsview/qgraphicswidget.cpp:336
#8  0x04b79aba in AbstractTaskItem::basicPreferredSize (this=0x8da2ae8) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:108
#9  0x04b754eb in TaskItemLayout::preferredColumns (this=0x881c140) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:206
#10 0x04b7623a in TaskItemLayout::gridLayoutSize (this=0x881c140) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:222
#11 0x04b762fb in TaskItemLayout::layoutItems (this=0x881c140) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:245
#12 0x04b76e2a in TaskItemLayout::insert (this=0x881c140, index=0, item=0x94e0898) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:125
#13 0x04b7700f in TaskItemLayout::addTaskItem (this=0x881c140, item=0x94e0898) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:82
#14 0x04b83fa2 in TaskGroupItem::itemAdded (this=0x8a61928, groupableItem=0x9057808) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:477
#15 0x04b84627 in TaskGroupItem::qt_metacall (this=0x8a61928, _c=QMetaObject::InvokeMetaMethod, _id=29, _a=0xbff649a8) at ./taskgroupitem.moc:113
#16 0x00620263 in QMetaObject::activate (sender=0x8a55770, from_signal_index=21, to_signal_index=21, argv=0xbff649a8) at kernel/qobject.cpp:3113
#17 0x00620ec2 in QMetaObject::activate (sender=0x8a55770, m=0x2650bf4, local_signal_index=0, argv=0xbff649a8) at kernel/qobject.cpp:3187
#18 0x02642433 in TaskManager::TaskGroup::itemAdded (this=0x8a55770, _t1=0x9057808) at ./taskgroup.moc:145
#19 0x02642e8b in TaskManager::TaskGroup::add (this=0x8a55770, item=0x9057808) at ../../../libs/taskmanager/taskgroup.cpp:138
#20 0x0262a052 in TaskManager::GroupManagerPrivate::addTask (this=0x8a470f0, task=) at ../../../libs/taskmanager/groupmanager.cpp:290
#21 0x0262aa45 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x8a470f0) at ../../../libs/taskmanager/groupmanager.cpp:155
#22 0x0262c3be in TaskManager::GroupManager::qt_metacall (this=0x8a37098, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbff64bbc) at ./groupmanager.moc:108
#23 0x00620263 in QMetaObject::activate (sender=0x8a47130, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#24 0x00620ec2 in QMetaObject::activate (sender=0x8a47130, m=0x6fb904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#25 0x0065a667 in QTimer::timeout (this=0x8a47130) at .moc/release-shared/moc_qtimer.cpp:128
#26 0x006259ae in QTimer::timerEvent (this=0x8a47130, e=0xbff65050) at kernel/qtimer.cpp:261
#27 0x0061a3bf in QObject::event (this=0x8a47130, e=0xbff65050) at kernel/qobject.cpp:1075
#28 0x00f90f54 in QApplicationPrivate::notify_helper (this=0x8490120, receiver=0x8a47130, e=0xbff65050) at kernel/qapplication.cpp:4056
#29 0x00f9867c in QApplication::notify (this=0x848a310, receiver=0x8a47130, e=0xbff65050) at kernel/qapplication.cpp:3603
#30 0x00b54bfa in KApplication::notify (this=0x848a310, receiver=0x8a47130, event=0xbff65050) at ../../kdeui/kernel/kapplication.cpp:302
#31 0x0060a6cb in QCoreApplication::notifyInternal (this=0x848a310, receiver=0x8a47130, event=0xbff65050) at kernel/qcoreapplication.cpp:610
#32 0x006377ce in QCoreApplication::sendEvent (this=0x84928cc) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 QTimerInfoList::activateTimers (this=0x84928cc) at kernel/qeventdispatcher_unix.cpp:572
#34 0x006350e0 in timerSourceDispatch (source=0x8492898) at kernel/qeventdispatcher_glib.cpp:165
#35 0x04d29e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#36 0x04d2d730 in ?? () from /lib/libglib-2.0.so.0
#37 0x04d2d863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#38 0x0063502c in QEventDispatcherGlib::processEvents (this=0x848ff10, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#39 0x01031be5 in QGuiEventDispatcherGlib::processEvents (this=0x848ff10, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#40 0x00608c79 in QEventLoop::processEvents (this=0xbff65314, flags=) at kernel/qeventloop.cpp:149
#41 0x006090ca in QEventLoop::exec (this=0xbff65314, flags=...) at kernel/qeventloop.cpp:201
#42 0x0060b53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#43 0x00f90dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#44 0x02b8480d in kdemain (argc=1, argv=0x84199e0) at ../../../../plasma/shells/desktop/main.cpp:50
#45 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x842f0d8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#46 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#47 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#48 0x0804fbaf in main (argc=2, argv=0xbff65b74, envp=0xbff65b80) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi