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 2.6.30-1-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
Plasma crashed during a Desktop switch. I noticed that the Taskbar was right-aligned and missing one running task before the switch. Also, since the beginning of the session the 'Digital Watch' widget was about two times larger than necessary.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f332f5fb750 (LWP 4700))]

Thread 2 (Thread 0x7f330fc61950 (LWP 4709)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f332f147469 in QWaitConditionPrivate::wait (this=0x1660cc0, mutex=0x1660cb8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=0x1660cc0, mutex=0x1660cb8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f332b547024 in QHostInfoAgent::run (this=0x1660ca0) at kernel/qhostinfo.cpp:260
#4  0x00007f332f146475 in QThreadPrivate::start (arg=0x1660ca0) at thread/qthread_unix.cpp:188
#5  0x00007f332be88f9a in start_thread (arg=<value optimized out>) at pthread_create.c:300
#6  0x00007f332ca4f56d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f332f5fb750 (LWP 4700)):
[KCrash Handler]
#5  Tasks::itemTopMargin (this=0x1eec090) at ../../../../plasma/applets/tasks/tasks.h:92
#6  AbstractTaskItem::basicPreferredSize (this=0x1eec090) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:100
#7  0x00007f3311de51a6 in TaskItemLayout::preferredColumns (this=0x177a720) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:206
#8  0x00007f3311de5b1c in TaskItemLayout::gridLayoutSize (this=0x177a720) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:222
#9  0x00007f3311de5bab in TaskItemLayout::layoutItems (this=0x0) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:245
#10 0x00007f3311de6744 in TaskItemLayout::insert (this=0x177a720, index=3, item=0x24be650) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:125
#11 0x00007f3311de6928 in TaskItemLayout::addTaskItem (this=0x177a720, item=0x24be650) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:82
#12 0x00007f3311df2318 in TaskGroupItem::itemAdded (this=0x1779ed0, groupableItem=0x2575290) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:477
#13 0x00007f3311df2902 in TaskGroupItem::qt_metacall (this=0x1779ed0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffc2ef80a0) at ./taskgroupitem.moc:113
#14 0x00007f332f241682 in QMetaObject::activate (sender=0x15e7c40, from_signal_index=<value optimized out>, to_signal_index=21, argv=0x0) at kernel/qobject.cpp:3112
#15 0x00007f331289e47f in TaskManager::TaskGroup::itemAdded (this=0x0, _t1=0x2575290) at ./taskgroup.moc:139
#16 0x00007f331289efab in TaskManager::TaskGroup::add (this=0x15e7c40, item=0x2575290) at ../../../libs/taskmanager/taskgroup.cpp:138
#17 0x00007f33128856fd in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x2543630, group=0x24701f0) at ../../../libs/taskmanager/abstractgroupingstrategy.cpp:168
#18 0x00007f331288c998 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x2543630) at ../../../libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#19 0x00007f331288d825 in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x2543630, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=<value optimized out>) at ./programgroupingstrategy.moc:68
#20 0x00007f332f241682 in QMetaObject::activate (sender=0x24701f0, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x0) at kernel/qobject.cpp:3112
#21 0x00007f331289e442 in TaskManager::TaskGroup::itemRemoved (this=0x0, _t1=0x246efd0) at ./taskgroup.moc:146
#22 0x00007f331289ed51 in TaskManager::TaskGroup::remove (this=0x24701f0, item=0x246efd0) at ../../../libs/taskmanager/taskgroup.cpp:182
#23 0x00007f3312888544 in TaskManager::GroupManagerPrivate::removeTask (this=0x167e610, task=...) at ../../../libs/taskmanager/groupmanager.cpp:311
#24 0x00007f3312888a7e in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x167e610) at ../../../libs/taskmanager/groupmanager.cpp:164
#25 0x00007f3312889cd2 in TaskManager::GroupManager::qt_metacall (this=0x174dc50, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffc2ef8530) at ./groupmanager.moc:108
#26 0x00007f332f241682 in QMetaObject::activate (sender=0x167e678, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#27 0x00007f332f23bbf3 in QObject::event (this=0x167e678, e=0x7f332ca9dbc8) at kernel/qobject.cpp:1074
#28 0x00007f332d1b980d in QApplicationPrivate::notify_helper (this=0x10381d0, receiver=0x167e678, e=0x7fffc2ef8be0) at kernel/qapplication.cpp:4056
#29 0x00007f332d1c186a in QApplication::notify (this=0x102f070, receiver=0x167e678, e=0x7fffc2ef8be0) at kernel/qapplication.cpp:4021
#30 0x00007f332de12b2b in KApplication::notify (this=0x102f070, receiver=0x167e678, event=0x7fffc2ef8be0) at ../../kdeui/kernel/kapplication.cpp:302
#31 0x00007f332f22c51c in QCoreApplication::notifyInternal (this=0x102f070, receiver=0x167e678, event=0x7fffc2ef8be0) at kernel/qcoreapplication.cpp:610
#32 0x00007f332f258826 in QCoreApplication::sendEvent (this=0x103b780) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#33 QTimerInfoList::activateTimers (this=0x103b780) at kernel/qeventdispatcher_unix.cpp:572
#34 0x00007f332f254c9d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#35 0x00007f332c0d67aa in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0x00007f332c0d9df8 in ?? () from /usr/lib/libglib-2.0.so.0
#37 0x00007f332c0d9fac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0x00007f332f254bff in QEventDispatcherGlib::processEvents (this=0x1037d00, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#39 0x00007f332d25064f in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#40 0x00007f332f22ade2 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#41 0x00007f332f22b1b4 in QEventLoop::exec (this=0x7fffc2ef8e90, flags=...) at kernel/qeventloop.cpp:201
#42 0x00007f332f22d424 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#43 0x00007f33234e91bb in kdemain (argc=1, argv=0xf93750) at ../../../../plasma/shells/desktop/main.cpp:50
#44 0x0000000000407264 in launch (argc=1, _name=0xfe5648 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0xfe5668 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a0ff "0") at ../../kinit/kinit.cpp:676
#45 0x0000000000407a28 in handle_launcher_request (sock=8, who=<value optimized out>) at ../../kinit/kinit.cpp:1168
#46 0x0000000000407fae in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1361
#47 0x000000000040863b in main (argc=2, argv=0x7fffc2ef9d08, envp=0x7fffc2ef9d20) at ../../kinit/kinit.cpp:1788

This bug may be a duplicate of or related to bug 205211

Reported using DrKonqi