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 dont really know what exact action caused the crash. I just started running the intel xserver driver in 1280x1024 today (always 800x600 before) and had many more windows open at the same time on the desktop than is usual.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7867700 (LWP 2428))]

Thread 2 (Thread 0xaa94ab70 (LWP 2432)):
#0  0x00ee8422 in __kernel_vsyscall ()
#1  0x005abe15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x00cb887d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x009fbe67 in QWaitConditionPrivate::wait (this=0x9a33a98, mutex=0x9a33a94, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9a33a98, mutex=0x9a33a94, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x00dbc922 in QHostInfoAgent::run (this=0x9a33a88) at kernel/qhostinfo.cpp:260
#6  0x009fae32 in QThreadPrivate::start (arg=0x9a33a88) at thread/qthread_unix.cpp:188
#7  0x005a780e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x00cab8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7867700 (LWP 2428)):
[KCrash Handler]
#6  0x02956e2c in QGraphicsLayoutItem::geometry (this=0x720071) at graphicsview/qgraphicslayoutitem.cpp:664
#7  0x0295aa4f in QGraphicsWidget::size (this=0x720061) at graphicsview/qgraphicswidget.cpp:336
#8  0x049afaba in AbstractTaskItem::basicPreferredSize (this=0x96b2398) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:108
#9  0x049ab4eb in TaskItemLayout::preferredColumns (this=0x9a4df50) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:206
#10 0x049ac23a in TaskItemLayout::gridLayoutSize (this=0x9a4df50) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:222
#11 0x049ac2fb in TaskItemLayout::layoutItems (this=0x9a4df50) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:245
#12 0x049acc34 in TaskItemLayout::remove (this=0x9a4df50, item=0x9a8f398) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:136
#13 0x049accec in TaskItemLayout::removeTaskItem (this=0x9a4df50, item=0x9a8f398) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:93
#14 0x049b91ce in TaskGroupItem::itemRemoved (this=0x9a4e718, groupableItem=0x9c68d50) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:521
#15 0x049ba647 in TaskGroupItem::qt_metacall (this=0x9a4e718, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbf8a6e48) at ./taskgroupitem.moc:114
#16 0x00b01263 in QMetaObject::activate (sender=0x9a4ba70, from_signal_index=22, to_signal_index=22, argv=0xbf8a6e48) at kernel/qobject.cpp:3113
#17 0x00b01ec2 in QMetaObject::activate (sender=0x9a4ba70, m=0x3dd6bf4, local_signal_index=1, argv=0xbf8a6e48) at kernel/qobject.cpp:3187
#18 0x03dc83e3 in TaskManager::TaskGroup::itemRemoved (this=0x9a4ba70, _t1=0x9c68d50) at ./taskgroup.moc:152
#19 0x03dc8c0b in TaskManager::TaskGroup::remove (this=0x9a4ba70, item=0x9c68d50) at ../../../libs/taskmanager/taskgroup.cpp:189
#20 0x03db071d in TaskManager::GroupManagerPrivate::removeTask (this=0x9a4bb58, task=...) at ../../../libs/taskmanager/groupmanager.cpp:311
#21 0x03db252b in TaskManager::GroupManager::qt_metacall (this=0x9a0c808, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbf8a7028) at ./groupmanager.moc:105
#22 0x00b01263 in QMetaObject::activate (sender=0x9a4b350, from_signal_index=5, to_signal_index=5, argv=0xbf8a7028) at kernel/qobject.cpp:3113
#23 0x00b01ec2 in QMetaObject::activate (sender=0x9a4b350, m=0x3dd6dbc, local_signal_index=1, argv=0xbf8a7028) at kernel/qobject.cpp:3187
#24 0x03dcbe33 in TaskManager::TaskManager::taskRemoved (this=0x9a4b350, _t1=...) at ./taskmanager.moc:162
#25 0x03dcdbb2 in TaskManager::TaskManager::windowRemoved (this=0x9a4b350, w=69206041) at ../../../libs/taskmanager/taskmanager.cpp:279
#26 0x03dcf4ff in TaskManager::TaskManager::qt_metacall (this=0x9a4b350, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbf8a71a8) at ./taskmanager.moc:110
#27 0x00b01263 in QMetaObject::activate (sender=0x983c288, from_signal_index=6, to_signal_index=6, argv=0xbf8a71a8) at kernel/qobject.cpp:3113
#28 0x00b01ec2 in QMetaObject::activate (sender=0x983c288, m=0x127326c, local_signal_index=2, argv=0xbf8a71a8) at kernel/qobject.cpp:3187
#29 0x0120add3 in KWindowSystem::windowRemoved (this=0x983c288, _t1=69206041) at ./kwindowsystem.moc:127
#30 0x0120e036 in KWindowSystemPrivate::removeClient (this=0x9839fc0, w=69206041) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#31 0x0121c53f in NETRootInfo::update (this=0x9839fd4, dirty_props=0xbf8a7338) at ../../kdeui/windowmanagement/netwm.cpp:2183
#32 0x0121d0b7 in NETRootInfo::event (this=0x9839fd4, event=<value optimized out>, properties=0xbf8a7424, properties_size=5) at ../../kdeui/windowmanagement/netwm.cpp:2058
#33 0x0120e2d1 in KWindowSystemPrivate::x11Event (this=0x9839fc0, ev=0xbf8a8a2c) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#34 0x010baf86 in KAppX11HackWidget::publicx11Event (this=0x964f630, _event=0xbf8a8a2c) at ../../kdeui/kernel/kapplication.cpp:911
#35 KApplication::x11EventFilter (this=0x964f630, _event=0xbf8a8a2c) at ../../kdeui/kernel/kapplication.cpp:961
#36 0x076c071a in PlasmaApp::x11EventFilter (this=0x964f630, event=0xbf8a8a2c) at ../../../../plasma/shells/desktop/plasmaapp.cpp:490
#37 0x02364d70 in qt_x11EventFilter (ev=0xbf8a8a2c) at kernel/qapplication_x11.cpp:375
#38 0x02376375 in QApplication::x11ProcessEvent (this=0x964f630, event=0xbf8a8a2c) at kernel/qapplication_x11.cpp:3271
#39 0x023a4502 in x11EventSourceDispatch (s=0x9678bf8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#40 0x0063fe88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#41 0x00643730 in ?? () from /lib/libglib-2.0.so.0
#42 0x00643863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#43 0x00b1602c in QEventDispatcherGlib::processEvents (this=0x9676260, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#44 0x023a3be5 in QGuiEventDispatcherGlib::processEvents (this=0x9676260, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#45 0x00ae9c79 in QEventLoop::processEvents (this=0xbf8a8d24, flags=) at kernel/qeventloop.cpp:149
#46 0x00aea0ca in QEventLoop::exec (this=0xbf8a8d24, flags=...) at kernel/qeventloop.cpp:201
#47 0x00aec53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#48 0x02302dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#49 0x076aa80d in kdemain (argc=1, argv=0x95ea1e8) at ../../../../plasma/shells/desktop/main.cpp:50
#50 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x9606a50 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#51 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#52 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#53 0x0804fbaf in main (argc=2, argv=0xbf8a9584, envp=0xbf8a9590) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi