Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-14-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Plasma Workspace crashed (because of another bug) and I restarted it with Alt+F2 -> plasma-workspace, and then it crashed with this report.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Aborted
[Current thread is 0 (LWP 28462)]

Thread 2 (Thread 0x7f15b45d3950 (LWP 28463)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f15d044e939 in QWaitCondition::wait (this=0x1a38390, mutex=0x1a38388, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f15d3a134cc in QHostInfoAgent::run (this=0x1a38370) at kernel/qhostinfo.cpp:260
#3  0x00007f15d044d952 in QThreadPrivate::start (arg=0x1a38370) at thread/qthread_unix.cpp:189
#4  0x00007f15ccbda3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f15cf9aafcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f15d500c790 (LWP 28462)):
[KCrash Handler]
#5  0x00007f15cf8f7fb5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x00007f15cf8f9bc3 in *__GI_abort () at abort.c:88
#7  0x00007f15d019d0b4 in __gnu_cxx::__verbose_terminate_handler () from /usr/lib/libstdc++.so.6
#8  0x00007f15d019b4b6 in ?? () from /usr/lib/libstdc++.so.6
#9  0x00007f15d019b4e3 in std::terminate () from /usr/lib/libstdc++.so.6
#10 0x00007f15d019bd8f in __cxa_pure_virtual () from /usr/lib/libstdc++.so.6
#11 0x00007f15b76b88dc in TaskGroupItem::updateTask (this=0x1857780, changes={i = -585838672}) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskgroupitem.cpp:212
#12 0x00007f15b76bcab1 in TaskGroupItem::qt_metacall (this=0x1857780, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdd14d0d0)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:112
#13 0x00007f15d054c1f2 in QMetaObject::activate (sender=0x18838a0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xffffffffffffffff) at kernel/qobject.cpp:3069
#14 0x00007f15b7467942 in TaskManager::AbstractGroupableItem::changed (this=0x6f2e, _t1=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/libs/taskmanager/abstractgroupableitem.moc:122
#15 0x00007f15b7467c9c in TaskManager::AbstractGroupableItem::qt_metacall (this=0x18838a0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdd14d200)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/libs/taskmanager/abstractgroupableitem.moc:94
#16 0x00007f15d054c1f2 in QMetaObject::activate (sender=0x154cb60, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xffffffffffffffff) at kernel/qobject.cpp:3069
#17 0x00007f15b7467942 in TaskManager::AbstractGroupableItem::changed (this=0x6f2e, _t1=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/libs/taskmanager/abstractgroupableitem.moc:122
#18 0x00007f15b74820d7 in TaskManager::TaskGroup::setName (this=0x154cb60, newName=<value optimized out>) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/taskgroup.cpp:222
#19 0x00007f15b74711ca in TaskManager::ProgramGroupingStrategy::programGrouping (this=0x1b67c60, taskItem=<value optimized out>, groupItem=0x1789e80)
    at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/strategies/programgroupingstrategy.cpp:192
#20 0x00007f15b7471632 in TaskManager::ProgramGroupingStrategy::handleItem (this=0x1b67c60, item=0x1791aa0)
    at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/strategies/programgroupingstrategy.cpp:152
#21 0x00007f15b746b0bd in TaskManager::GroupManagerPrivate::addTask (this=0x1549e40, task={d = 0x7fffdd14d4d0}) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/groupmanager.cpp:288
#22 0x00007f15b746bdf1 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x1549e40) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/groupmanager.cpp:155
#23 0x00007f15b746c313 in TaskManager::GroupManager::setGroupingStrategy (this=0x1784120, strategy=TaskManager::GroupManager::ProgramGrouping)
    at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/groupmanager.cpp:693
#24 0x00007f15b76abe3e in Tasks::qt_metacall (this=0x1590e50, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdd14d6b0)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/plasma/applets/tasks/tasks.moc:82
#25 0x00007f15d054c1f2 in QMetaObject::activate (sender=0x1808670, from_signal_index=<value optimized out>, to_signal_index=16, argv=0xffffffffffffffff) at kernel/qobject.cpp:3069
#26 0x00007f15b76b78e1 in TaskGroupItem::sizeHintChanged (this=0x6f2e, _t1=Qt::PreferredSize) at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:137
#27 0x00007f15b76bb049 in TaskGroupItem::updatePreferredSize (this=0x1808670) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskgroupitem.cpp:812
#28 0x00007f15b76af4de in TaskItemLayout::updatePreferredSize (this=0x1809050) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskitemlayout.cpp:400
#29 0x00007f15b76b001b in TaskItemLayout::layoutItems (this=0x1809050) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskitemlayout.cpp:377
#30 0x00007f15b76b05f9 in TaskItemLayout::remove (this=0x1809050, item=0x1857780) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskitemlayout.cpp:136
#31 0x00007f15b76b069e in TaskItemLayout::removeTaskItem (this=0x6f2e, item=0x6f2e) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskitemlayout.cpp:93
#32 0x00007f15b76bb6a9 in TaskGroupItem::itemRemoved (this=0x1808670, groupableItem=0x18838a0) at /build/buildd/kdebase-workspace-4.2.96/plasma/applets/tasks/taskgroupitem.cpp:521
#33 0x00007f15b76bca71 in TaskGroupItem::qt_metacall (this=0x1808670, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdd14dc40)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/plasma/applets/tasks/taskgroupitem.moc:114
#34 0x00007f15d054c1f2 in QMetaObject::activate (sender=0x1789e80, from_signal_index=<value optimized out>, to_signal_index=22, argv=0xffffffffffffffff) at kernel/qobject.cpp:3069
#35 0x00007f15b7481c72 in TaskManager::TaskGroup::itemRemoved (this=0x6f2e, _t1=0x18838a0) at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:146
#36 0x00007f15b7482138 in TaskManager::TaskGroup::itemDestroyed (this=0x1789e80, item=0x18838a0) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/taskgroup.cpp:144
#37 0x00007f15b74835d1 in TaskManager::TaskGroup::qt_metacall (this=0x1789e80, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdd14dd90)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:127
#38 0x00007f15d054c1f2 in QMetaObject::activate (sender=0x18838a0, from_signal_index=<value optimized out>, to_signal_index=5, argv=0xffffffffffffffff) at kernel/qobject.cpp:3069
#39 0x00007f15b7467912 in TaskManager::AbstractGroupableItem::destroyed (this=0x6f2e, _t1=0x18838a0)
    at /build/buildd/kdebase-workspace-4.2.96/obj-x86_64-linux-gnu/libs/taskmanager/abstractgroupableitem.moc:129
#40 0x00007f15b7467d6a in ~AbstractGroupableItem (this=0x6f2e) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/abstractgroupableitem.cpp:62
#41 0x00007f15b7482c00 in ~TaskGroup (this=0x18838a0) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/taskgroup.cpp:94
#42 0x00007f15b746898e in ~AbstractGroupingStrategy (this=0x158e470) at /usr/include/qt4/QtCore/qalgorithms.h:350
#43 0x00007f15b74703a9 in ~ProgramGroupingStrategy (this=0x158e470) at /build/buildd/kdebase-workspace-4.2.96/libs/taskmanager/strategies/programgroupingstrategy.cpp:73
#44 0x00007f15d0546865 in QObject::event (this=0x158e470, e=0x6f2e) at kernel/qobject.cpp:1101
#45 0x00007f15d0c7b78d in QApplicationPrivate::notify_helper (this=0x10591f0, receiver=0x158e470, e=0x1790e80) at kernel/qapplication.cpp:4084
#46 0x00007f15d0c8397a in QApplication::notify (this=0x1048cd0, receiver=0x158e470, e=0x1790e80) at kernel/qapplication.cpp:4049
#47 0x00007f15d334b63b in KApplication::notify (this=0x1048cd0, receiver=0x158e470, event=0x1790e80) at /build/buildd/kde4libs-4.2.96/kdeui/kernel/kapplication.cpp:302
#48 0x00007f15d053675c in QCoreApplication::notifyInternal (this=0x1048cd0, receiver=0x158e470, event=0x1790e80) at kernel/qcoreapplication.cpp:602
#49 0x00007f15d05373ca in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1031080) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#50 0x00007f15d05601e3 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#51 0x00007f15cafaa20a in IA__g_main_context_dispatch (context=0x105b920) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#52 0x00007f15cafad8e0 in g_main_context_iterate (context=0x105b920, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#53 0x00007f15cafada7c in IA__g_main_context_iteration (context=0x105b920, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#54 0x00007f15d055fe6f in QEventDispatcherGlib::processEvents (this=0x1030e30, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#55 0x00007f15d0d13bef in QGuiEventDispatcherGlib::processEvents (this=0x6f2e, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#56 0x00007f15d0535002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -585832672}) at kernel/qeventloop.cpp:149
#57 0x00007f15d05353cd in QEventLoop::exec (this=0x7fffdd14e760, flags={i = -585832592}) at kernel/qeventloop.cpp:200
#58 0x00007f15d0537694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#59 0x00007f15d4ce66bb in kdemain (argc=1, argv=0x7fffdd14ea68) at /build/buildd/kdebase-workspace-4.2.96/plasma/shells/desktop/main.cpp:50
#60 0x00007f15cf8e35a6 in __libc_start_main (main=0x400890 <main>, argc=1, ubp_av=0x7fffdd14ea68, init=0x4008c0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffdd14ea58) at libc-start.c:220
#61 0x00000000004007c9 in _start () at ../sysdeps/x86_64/elf/start.S:113

Reported using DrKonqi