Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.98 (KDE 4.2.98 (KDE 4.3 RC3))
Qt Version: 4.5.2
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Plasma crashed after closing some windows and switch the virtual desktop

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4323)]

Thread 2 (Thread 0xa800db90 (LWP 4327)):
#0  0xb8005430 in __kernel_vsyscall ()
#1  0xb65190e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66f92ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7dfb172 in QWaitCondition::wait (this=0xa3e9b10, mutex=0xa3e9b0c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb773bac2 in QHostInfoAgent::run (this=0xa3e9b00) at kernel/qhostinfo.cpp:260
#5  0xb7dfa132 in QThreadPrivate::start (arg=0xa3e9b00) at thread/qthread_unix.cpp:188
#6  0xb65154ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb66ea49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb6023a10 (LWP 4323)):
[KCrash Handler]
#6  AbstractTaskItem::basicPreferredSize (this=0xabe9a90) at /build/buildd/kdebase-workspace-4.2.98/plasma/applets/tasks/tasks.h:92
#7  0xa85e80b6 in TaskItemLayout::layoutItems (this=0xa2e9c38) at /build/buildd/kdebase-workspace-4.2.98/plasma/applets/tasks/taskitemlayout.cpp:273
#8  0xa85e8ba2 in TaskItemLayout::insert (this=0xa2e9c38, index=2, item=0xa76a548) at /build/buildd/kdebase-workspace-4.2.98/plasma/applets/tasks/taskitemlayout.cpp:125
#9  0xa85e8d97 in TaskItemLayout::addTaskItem (this=0xa2e9c38, item=0xa76a548) at /build/buildd/kdebase-workspace-4.2.98/plasma/applets/tasks/taskitemlayout.cpp:82
#10 0xa85f5ae5 in TaskGroupItem::itemAdded (this=0xa2ea398, groupableItem=0xac316e0) at /build/buildd/kdebase-workspace-4.2.98/plasma/applets/tasks/taskgroupitem.cpp:477
#11 0xa85f614c in TaskGroupItem::qt_metacall (this=0xa2ea398, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfc216ac)
    at /build/buildd/kdebase-workspace-4.2.98/obj-i486-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:113
#12 0xb7f041b8 in QMetaObject::activate (sender=0xa2e9fb0, from_signal_index=21, to_signal_index=21, argv=0xbfc216ac) at kernel/qobject.cpp:3113
#13 0xb7f04e42 in QMetaObject::activate (sender=0xa2e9fb0, m=0xa8670b74, local_signal_index=0, argv=0xbfc216ac) at kernel/qobject.cpp:3187
#14 0xa8661f23 in TaskManager::TaskGroup::itemAdded (this=0xa2e9fb0, _t1=0xac316e0) at /build/buildd/kdebase-workspace-4.2.98/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:139
#15 0xa8662b85 in TaskManager::TaskGroup::add (this=0xa2e9fb0, item=0xac316e0) at /build/buildd/kdebase-workspace-4.2.98/libs/taskmanager/taskgroup.cpp:138
#16 0xa864f736 in TaskManager::ProgramGroupingStrategy::handleItem (this=0xacbea48, item=0xac316e0)
    at /build/buildd/kdebase-workspace-4.2.98/libs/taskmanager/strategies/programgroupingstrategy.cpp:154
#17 0xa8648d25 in TaskManager::GroupManagerPrivate::addTask (this=0xa2e6c98, task={d = 0xbfc21814}) at /build/buildd/kdebase-workspace-4.2.98/libs/taskmanager/groupmanager.cpp:288
#18 0xa8649b3a in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0xa2e6c98) at /build/buildd/kdebase-workspace-4.2.98/libs/taskmanager/groupmanager.cpp:155
#19 0xa864b0de in TaskManager::GroupManager::qt_metacall (this=0xa0b53a8, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfc218e8)
    at /build/buildd/kdebase-workspace-4.2.98/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:108
#20 0xb7f041b8 in QMetaObject::activate (sender=0xa2e6cd8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#21 0xb7f04e42 in QMetaObject::activate (sender=0xa2e6cd8, m=0xb7fe1904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#22 0xb7f40687 in QTimer::timeout (this=0xa2e6cd8) at .moc/release-shared/moc_qtimer.cpp:128
#23 0xb7f0a5ce in QTimer::timerEvent (this=0xa2e6cd8, e=0xbfc21d6c) at kernel/qtimer.cpp:261
#24 0xb7eff16f in QObject::event (this=0xa2e6cd8, e=0xbfc21d6c) at kernel/qobject.cpp:1075
#25 0xb69afd3c in QApplicationPrivate::notify_helper (this=0x9e5bdb0, receiver=0xa2e6cd8, e=0xbfc21d6c) at kernel/qapplication.cpp:4056
#26 0xb69b803e in QApplication::notify (this=0x9e1deb0, receiver=0xa2e6cd8, e=0xbfc21d6c) at kernel/qapplication.cpp:3603
#27 0xb74c05cd in KApplication::notify (this=0x9e1deb0, receiver=0xa2e6cd8, event=0xbfc21d6c) at /build/buildd/kde4libs-4.2.98a/kdeui/kernel/kapplication.cpp:302
#28 0xb7eeebcb in QCoreApplication::notifyInternal (this=0x9e1deb0, receiver=0xa2e6cd8, event=0xbfc21d6c) at kernel/qcoreapplication.cpp:610
#29 0xb7f1dd51 in QTimerInfoList::activateTimers (this=0x9e5e5a4) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#30 0xb7f1a3a0 in timerSourceDispatch (source=0x9e5e570) at kernel/qeventdispatcher_glib.cpp:165
#31 0xb6562b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#32 0xb65660eb in ?? () from /usr/lib/libglib-2.0.so.0
#33 0xb6566268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#34 0xb7f1a2f8 in QEventDispatcherGlib::processEvents (this=0x9e5bb70, flags={i = -1077797144}) at kernel/qeventdispatcher_glib.cpp:327
#35 0xb6a51a75 in QGuiEventDispatcherGlib::processEvents (this=0x9e5bb70, flags={i = -1077797096}) at kernel/qguieventdispatcher_glib.cpp:202
#36 0xb7eed1fa in QEventLoop::processEvents (this=0xbfc21f90, flags={i = -1077797032}) at kernel/qeventloop.cpp:149
#37 0xb7eed642 in QEventLoop::exec (this=0xbfc21f90, flags={i = -1077796968}) at kernel/qeventloop.cpp:201
#38 0xb7eefae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#39 0xb69afbb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#40 0xb3bcd5d0 in kdemain (argc=1, argv=0x9e3beb0) at /build/buildd/kdebase-workspace-4.2.98/plasma/shells/desktop/main.cpp:50
#41 0x0804e27d in launch (argc=1, _name=0x9dd357c "/usr/bin/plasma-desktop", args=0x9dd3594 "", cwd=0x0, envc=0, envs=0x9dd3598 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051391 "0") at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:676
#42 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:1168
#43 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:1361
#44 0x0804fbca in main (argc=2, argv=0xbfc22784, envp=0xbfc22790) at /build/buildd/kde4libs-4.2.98a/kinit/kinit.cpp:1788

Reported using DrKonqi