Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

What I was doing when the application crashed:
crash when changing task manager settings (for grouping and sorting) and then quickly changing to a different work space

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3633)]

Thread 2 (Thread 0x7f225bc7e910 (LWP 3636)):
#0  0x00007f22798a7dd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f2279b12c1b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f2275f93a3c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f2279b11b55 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f22798a357a in start_thread () from /lib/libpthread.so.0
#5  0x00007f227726f14d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f227a0c9750 (LWP 3633)):
[KCrash Handler]
#5  0x00007f225dcb8cf8 in AbstractTaskItem::basicPreferredSize () from /usr/lib/kde4/plasma_applet_tasks.so
#6  0x00007f225dcb5125 in TaskItemLayout::preferredColumns () from /usr/lib/kde4/plasma_applet_tasks.so
#7  0x00007f225dcb5e0d in TaskItemLayout::gridLayoutSize () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0x00007f225dcb5e9b in TaskItemLayout::layoutItems () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0x00007f225dcb6727 in TaskItemLayout::remove () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0x00007f225dcb67ce in TaskItemLayout::removeTaskItem () from /usr/lib/kde4/plasma_applet_tasks.so
#11 0x00007f225dcc1a73 in TaskGroupItem::itemRemoved () from /usr/lib/kde4/plasma_applet_tasks.so
#12 0x00007f225dcc2eb4 in TaskGroupItem::qt_metacall () from /usr/lib/kde4/plasma_applet_tasks.so
#13 0x00007f2279c0c6bc in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0x00007f225da87252 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#15 0x00007f225da87931 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#16 0x00007f225da715ab in TaskManager::GroupManagerPrivate::removeTask () from /usr/lib/libtaskmanager.so.4
#17 0x00007f225da71a93 in TaskManager::GroupManagerPrivate::actuallyReloadTasks () from /usr/lib/libtaskmanager.so.4
#18 0x00007f225da73139 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#19 0x00007f2279c0c6bc in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0x00007f2279c06663 in QObject::event () from /usr/lib/libQtCore.so.4
#21 0x00007f22779940cc in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0x00007f227799b39e in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0x00007f22785c78d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0x00007f2279bf75bc in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0x00007f2279c22bd2 in ?? () from /usr/lib/libQtCore.so.4
#26 0x00007f2279c1fb3d in ?? () from /usr/lib/libQtCore.so.4
#27 0x00007f22768f9dbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#28 0x00007f22768fd568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#29 0x00007f22768fd690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#30 0x00007f2279c1fa86 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#31 0x00007f2277a2707e in ?? () from /usr/lib/libQtGui.so.4
#32 0x00007f2279bf5ec2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#33 0x00007f2279bf6294 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#34 0x00007f2279bf8449 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#35 0x00007f226e6e428f in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#36 0x0000000000406eae in _start ()

Reported using DrKonqi