Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
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:
This happens mostly when I try to switch to a virtual desktop which has no windows opened. After plasma crashes it restarts itself.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 6418)]

Thread 2 (Thread 0xa6a77b90 (LWP 6424)):
#0  0xb7fb8430 in __kernel_vsyscall ()
#1  0xb64cc0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66ac2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7dae172 in QWaitCondition::wait (this=0x9825b88, mutex=0x9825b84, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb76eeac2 in QHostInfoAgent::run (this=0x9825b78) at kernel/qhostinfo.cpp:260
#5  0xb7dad132 in QThreadPrivate::start (arg=0x9825b78) at thread/qthread_unix.cpp:188
#6  0xb64c84ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb669d49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5fd6a10 (LWP 6418)):
[KCrash Handler]
#6  TaskManager::TaskGroup::members (this=0x0) at /usr/include/qt4/QtCore/qlist.h:111
#7  0xa8672275 in TaskManager::ManualSortingStrategy::handleItem (this=0x9771558, item=0xaa229c8) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/strategies/manualsortingstrategy.cpp:151
#8  0xa8672134 in TaskManager::ManualSortingStrategy::qt_metacall (this=0x9771558, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfcd355c)
    at /build/buildd/kdebase-workspace-4.3.0/obj-i486-linux-gnu/libs/taskmanager/manualsortingstrategy.moc:67
#9  0xb7eb71b8 in QMetaObject::activate (sender=0x9741130, from_signal_index=21, to_signal_index=21, argv=0xbfcd355c) at kernel/qobject.cpp:3113
#10 0xb7eb7e42 in QMetaObject::activate (sender=0x9741130, m=0xa868fb74, local_signal_index=0, argv=0xbfcd355c) at kernel/qobject.cpp:3187
#11 0xa8680f23 in TaskManager::TaskGroup::itemAdded (this=0x9741130, _t1=0xaa229c8) at /build/buildd/kdebase-workspace-4.3.0/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:139
#12 0xa8681b85 in TaskManager::TaskGroup::add (this=0x9741130, item=0xaa229c8) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/taskgroup.cpp:138
#13 0xa8665383 in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x9e02438, group=0x97239d8) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/abstractgroupingstrategy.cpp:168
#14 0xa866d077 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x9e02438) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#15 0xa866dfab in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x9e02438, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfcd373c)
    at /build/buildd/kdebase-workspace-4.3.0/obj-i486-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#16 0xb7eb71b8 in QMetaObject::activate (sender=0x97239d8, from_signal_index=22, to_signal_index=22, argv=0xbfcd373c) at kernel/qobject.cpp:3113
#17 0xb7eb7e42 in QMetaObject::activate (sender=0x97239d8, m=0xa868fb74, local_signal_index=1, argv=0xbfcd373c) at kernel/qobject.cpp:3187
#18 0xa8680ed3 in TaskManager::TaskGroup::itemRemoved (this=0x97239d8, _t1=0xa03e498) at /build/buildd/kdebase-workspace-4.3.0/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:146
#19 0xa86818fb in TaskManager::TaskGroup::remove (this=0x97239d8, item=0xa03e498) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/taskgroup.cpp:182
#20 0xa866881d in TaskManager::GroupManagerPrivate::removeTask (this=0x97686f8, task={d = 0xbfcd3800}) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/groupmanager.cpp:311
#21 0xa8668d07 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x97686f8) at /build/buildd/kdebase-workspace-4.3.0/libs/taskmanager/groupmanager.cpp:164
#22 0xa866a0de in TaskManager::GroupManager::qt_metacall (this=0x978e970, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfcd38d8)
    at /build/buildd/kdebase-workspace-4.3.0/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:108
#23 0xb7eb71b8 in QMetaObject::activate (sender=0x9768738, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#24 0xb7eb7e42 in QMetaObject::activate (sender=0x9768738, m=0xb7f94904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#25 0xb7ef3687 in QTimer::timeout (this=0x9768738) at .moc/release-shared/moc_qtimer.cpp:128
#26 0xb7ebd5ce in QTimer::timerEvent (this=0x9768738, e=0xbfcd3d5c) at kernel/qtimer.cpp:261
#27 0xb7eb216f in QObject::event (this=0x9768738, e=0xbfcd3d5c) at kernel/qobject.cpp:1075
#28 0xb6962d3c in QApplicationPrivate::notify_helper (this=0x8960c28, receiver=0x9768738, e=0xbfcd3d5c) at kernel/qapplication.cpp:4056
#29 0xb696b03e in QApplication::notify (this=0x895b130, receiver=0x9768738, e=0xbfcd3d5c) at kernel/qapplication.cpp:3603
#30 0xb74735cd in KApplication::notify (this=0x895b130, receiver=0x9768738, event=0xbfcd3d5c) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#31 0xb7ea1bcb in QCoreApplication::notifyInternal (this=0x895b130, receiver=0x9768738, event=0xbfcd3d5c) at kernel/qcoreapplication.cpp:610
#32 0xb7ed0d51 in QTimerInfoList::activateTimers (this=0x8963a74) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 0xb7ecd3a0 in timerSourceDispatch (source=0x8963a40) at kernel/qeventdispatcher_glib.cpp:165
#34 0xb6515b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb65190eb in ?? () from /usr/lib/libglib-2.0.so.0
#36 0xb6519268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0xb7ecd2f8 in QEventDispatcherGlib::processEvents (this=0x8960940, flags={i = -1077068072}) at kernel/qeventdispatcher_glib.cpp:327
#38 0xb6a04a75 in QGuiEventDispatcherGlib::processEvents (this=0x8960940, flags={i = -1077068024}) at kernel/qguieventdispatcher_glib.cpp:202
#39 0xb7ea01fa in QEventLoop::processEvents (this=0xbfcd3f80, flags={i = -1077067960}) at kernel/qeventloop.cpp:149
#40 0xb7ea0642 in QEventLoop::exec (this=0xbfcd3f80, flags={i = -1077067896}) at kernel/qeventloop.cpp:201
#41 0xb7ea2ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#42 0xb6962bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#43 0xb3bc4120 in kdemain (argc=1, argv=0x8928810) at /build/buildd/kdebase-workspace-4.3.0/plasma/shells/desktop/main.cpp:50
#44 0x0804e27d in launch (argc=1, _name=0x8947e44 "/usr/bin/plasma-desktop", args=0x8947e5c "", cwd=0x0, envc=0, envs=0x8947e60 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805136d "0") at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:676
#45 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1168
#46 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1361
#47 0x0804fbca in main (argc=2, argv=0xbfcd4774, envp=0xbfcd4780) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1788

Reported using DrKonqi