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-ARCH i686

What I was doing when the application crashed:
Closed laptop -> screensaver activated
Opened laptop again -> crash

First time crash, normaly works without a problem

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3434)]

Thread 2 (Thread 0xa87ffb70 (LWP 3442)):
#0  0xb8052424 in __kernel_vsyscall ()
#1  0xb7df1bc5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7e50047 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb66c2c12 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7e4f032 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7ded68c in start_thread () from /lib/libpthread.so.0
#6  0xb693fe2e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5f44700 (LWP 3434)):
[KCrash Handler]
#6  0xa92ce2bc in AbstractTaskItem::basicPreferredSize () from /usr/lib/kde4/plasma_applet_tasks.so
#7  0xa92ca26b in TaskItemLayout::preferredColumns () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0xa92cafaa in TaskItemLayout::gridLayoutSize () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0xa92cb06b in TaskItemLayout::layoutItems () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0xa92cb9a4 in TaskItemLayout::remove () from /usr/lib/kde4/plasma_applet_tasks.so
#11 0xa92cba5c in TaskItemLayout::removeTaskItem () from /usr/lib/kde4/plasma_applet_tasks.so
#12 0xa92d799e in TaskGroupItem::itemRemoved () from /usr/lib/kde4/plasma_applet_tasks.so
#13 0xa92d9177 in TaskGroupItem::qt_metacall () from /usr/lib/kde4/plasma_applet_tasks.so
#14 0xb7f5398c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb7f545c2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xa93397d3 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#17 0xa9339ffb in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#18 0xa933a1e6 in TaskManager::TaskGroup::add () from /usr/lib/libtaskmanager.so.4
#19 0xa931dcb3 in TaskManager::AbstractGroupingStrategy::createGroup () from /usr/lib/libtaskmanager.so.4
#20 0xa932703c in TaskManager::ProgramGroupingStrategy::programGrouping () from /usr/lib/libtaskmanager.so.4
#21 0xa93275cb in TaskManager::ProgramGroupingStrategy::handleItem () from /usr/lib/libtaskmanager.so.4
#22 0xa9320f72 in TaskManager::GroupManagerPrivate::addTask () from /usr/lib/libtaskmanager.so.4
#23 0xa93219a5 in TaskManager::GroupManagerPrivate::actuallyReloadTasks () from /usr/lib/libtaskmanager.so.4
#24 0xa93232ce in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#25 0xb7f5398c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#26 0xb7f545c2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#27 0xb7f8da67 in QTimer::timeout () from /usr/lib/libQtCore.so.4
#28 0xb7f5903e in QTimer::timerEvent () from /usr/lib/libQtCore.so.4
#29 0xb7f4db3f in QObject::event () from /usr/lib/libQtCore.so.4
#30 0xb6bca6c4 in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#31 0xb6bd1dac in QApplication::notify () from /usr/lib/libQtGui.so.4
#32 0xb760cfaa in KApplication::notify () from /usr/lib/libkdeui.so.5
#33 0xb7f3dfab in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#34 0xb7f6b77e in ?? () from /usr/lib/libQtCore.so.4
#35 0xb7f68760 in ?? () from /usr/lib/libQtCore.so.4
#36 0xb67d4d98 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#37 0xb67d83e0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#38 0xb67d8513 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#39 0xb7f686ac in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb6c68355 in ?? () from /usr/lib/libQtGui.so.4
#41 0xb7f3c559 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#42 0xb7f3c9aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#43 0xb7f3ee1f in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#44 0xb6bca547 in QApplication::exec () from /usr/lib/libQtGui.so.4
#45 0xb48805ad in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#46 0x0804de22 in _start ()

Reported using DrKonqi