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 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I did a single switch from one workspace to another. Previous crashes required multiple switches in sequence, but this time it was just one single switch.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7840700 (LWP 2404))]

Thread 2 (Thread 0xaa708b70 (LWP 2405)):
#0  0x0016a422 in __kernel_vsyscall ()
#1  0x00891e15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0x0474078d in __pthread_cond_wait (cond=0x8f94130, mutex=0x8f94118) at forward.c:139
#3  0x001bae67 in QWaitConditionPrivate::wait (this=0x8f949f0, mutex=0x8f949ec, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8f949f0, mutex=0x8f949ec, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x02e53922 in QHostInfoAgent::run (this=0x8f949e0) at kernel/qhostinfo.cpp:260
#6  0x001b9e32 in QThreadPrivate::start (arg=0x8f949e0) at thread/qthread_unix.cpp:188
#7  0x0088d80e in start_thread (arg=0xaa708b70) at pthread_create.c:300
#8  0x047337ee in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb7840700 (LWP 2404)):
[KCrash Handler]
#6  Tasks::itemTopMargin (this=0x9a9c890) at ../../../../plasma/applets/tasks/tasks.h:92
#7  AbstractTaskItem::basicPreferredSize (this=0x9a9c890) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:102
#8  0x01f954eb in TaskItemLayout::preferredColumns (this=0x8f5b510) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:206
#9  0x01f9623a in TaskItemLayout::gridLayoutSize (this=0x8f5b510) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:222
#10 0x01f962fb in TaskItemLayout::layoutItems (this=0x8f5b510) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:245
#11 0x01f96e2a in TaskItemLayout::insert (this=0x8f5b510, index=2, item=0x9b09a20) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:125
#12 0x01f9700f in TaskItemLayout::addTaskItem (this=0x8f5b510, item=0x9b09a20) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:82
#13 0x01fa3fa2 in TaskGroupItem::itemAdded (this=0x8f63c78, groupableItem=0x9147240) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:477
#14 0x01fa4627 in TaskGroupItem::qt_metacall (this=0x8f63c78, _c=QMetaObject::InvokeMetaMethod, _id=29, _a=0xbfb7b7c8) at ./taskgroupitem.moc:113
#15 0x002c0263 in QMetaObject::activate (sender=0x8f64200, from_signal_index=21, to_signal_index=21, argv=0xbfb7b7c8) at kernel/qobject.cpp:3113
#16 0x002c0ec2 in QMetaObject::activate (sender=0x8f64200, m=0x1df9bf4, local_signal_index=0, argv=0xbfb7b7c8) at kernel/qobject.cpp:3187
#17 0x01deb433 in TaskManager::TaskGroup::itemAdded (this=0x8f64200, _t1=0x9147240) at ./taskgroup.moc:145
#18 0x01debe8b in TaskManager::TaskGroup::add (this=0x8f64200, item=0x9147240) at ../../../libs/taskmanager/taskgroup.cpp:138
#19 0x01dd3052 in TaskManager::GroupManagerPrivate::addTask (this=0x8f607f0, task=) at ../../../libs/taskmanager/groupmanager.cpp:290
#20 0x01dd3a45 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x8f607f0) at ../../../libs/taskmanager/groupmanager.cpp:155
#21 0x01dd53be in TaskManager::GroupManager::qt_metacall (this=0x8cebec0, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfb7b9dc) at ./groupmanager.moc:108
#22 0x002c0263 in QMetaObject::activate (sender=0x8f60830, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#23 0x002c0ec2 in QMetaObject::activate (sender=0x8f60830, m=0x39b904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#24 0x002fa667 in QTimer::timeout (this=0x8f60830) at .moc/release-shared/moc_qtimer.cpp:128
#25 0x002c59ae in QTimer::timerEvent (this=0x8f60830, e=0xbfb7be70) at kernel/qtimer.cpp:261
#26 0x002ba3bf in QObject::event (this=0x8f60830, e=0xbfb7be70) at kernel/qobject.cpp:1075
#27 0x00f9ef54 in QApplicationPrivate::notify_helper (this=0x8a77820, receiver=0x8f60830, e=0xbfb7be70) at kernel/qapplication.cpp:4056
#28 0x00fa667c in QApplication::notify (this=0x8a50a20, receiver=0x8f60830, e=0xbfb7be70) at kernel/qapplication.cpp:3603
#29 0x00bf2bfa in KApplication::notify (this=0x8a50a20, receiver=0x8f60830, event=0xbfb7be70) at ../../kdeui/kernel/kapplication.cpp:302
#30 0x002aa6cb in QCoreApplication::notifyInternal (this=0x8a50a20, receiver=0x8f60830, event=0xbfb7be70) at kernel/qcoreapplication.cpp:610
#31 0x002d77ce in QCoreApplication::sendEvent (this=0x8a7a434) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#32 QTimerInfoList::activateTimers (this=0x8a7a434) at kernel/qeventdispatcher_unix.cpp:572
#33 0x002d50e0 in timerSourceDispatch (source=0x8a7a400) at kernel/qeventdispatcher_glib.cpp:165
#34 0x06ff0e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#35 0x06ff4720 in ?? () from /lib/libglib-2.0.so.0
#36 0x06ff4853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#37 0x002d502c in QEventDispatcherGlib::processEvents (this=0x8a77610, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#38 0x0103fbe5 in QGuiEventDispatcherGlib::processEvents (this=0x8a77610, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#39 0x002a8c79 in QEventLoop::processEvents (this=0xbfb7c134, flags=) at kernel/qeventloop.cpp:149
#40 0x002a90ca in QEventLoop::exec (this=0xbfb7c134, flags=...) at kernel/qeventloop.cpp:201
#41 0x002ab53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#42 0x00f9edd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#43 0x01bf980d in kdemain (argc=1, argv=0x8a39c38) at ../../../../plasma/shells/desktop/main.cpp:50
#44 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x8a03b28 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#45 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#46 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#47 0x0804fbaf in main (argc=2, argv=0xbfb7c994, envp=0xbfb7c9a0) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 216825

Reported using DrKonqi