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 2.6.30.5-43.fc11.i686.PAE i686
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
I was moving a window from one desktop to another and plasma crashed.   Came back up again 2 seconds later.  No impact.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7f2b780 (LWP 1870))]

Thread 2 (Thread 0xacdd8b70 (LWP 1871)):
#0  0x008b3416 in __kernel_vsyscall ()
#1  0x00dbffa5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x024d4337 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0x027344d2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0x024d32f2 in ?? () from /usr/lib/libQtCore.so.4
#5  0x00dbb935 in start_thread () from /lib/libpthread.so.0
#6  0x00cf094e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7f2b780 (LWP 1870)):
[KCrash Handler]
#6  0x00f544fc in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#7  0x00f5048b in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0x00f511da in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0x00f5129b in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0x00f51dda in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#11 0x00f51fbf in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#12 0x00f5f332 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#13 0x00f5f997 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#14 0x025d9853 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x025da4b2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#16 0x00f28953 in TaskManager::TaskGroup::itemAdded(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#17 0x00f293a5 in TaskManager::TaskGroup::add(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#18 0x00f0d48e in TaskManager::AbstractGroupingStrategy::closeGroup(TaskManager::TaskGroup*) () from /usr/lib/libtaskmanager.so.4
#19 0x00f14e8d in ?? () from /usr/lib/libtaskmanager.so.4
#20 0x00f15b61 in ?? () from /usr/lib/libtaskmanager.so.4
#21 0x025d9853 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#22 0x025da4b2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#23 0x00f28903 in TaskManager::TaskGroup::itemRemoved(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#24 0x00f2912b in TaskManager::TaskGroup::remove(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#25 0x00f1069d in ?? () from /usr/lib/libtaskmanager.so.4
#26 0x00f11a0d in ?? () from /usr/lib/libtaskmanager.so.4
#27 0x00f1240a in TaskManager::GroupManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#28 0x025d9853 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#29 0x025da4b2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#30 0x00f2c1b9 in TaskManager::TaskManager::windowChanged(KSharedPtr<TaskManager::Task>, QFlags<TaskManager::TaskChange>) () from /usr/lib/libtaskmanager.so.4
#31 0x00f2f69f in TaskManager::TaskManager::taskChanged(QFlags<TaskManager::TaskChange>) () from /usr/lib/libtaskmanager.so.4
#32 0x00f2fb2d in TaskManager::TaskManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#33 0x025d9853 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#34 0x025da4b2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#35 0x00f1da73 in TaskManager::Task::changed(QFlags<TaskManager::TaskChange>) () from /usr/lib/libtaskmanager.so.4
#36 0x00f220b5 in TaskManager::Task::refresh(unsigned int) () from /usr/lib/libtaskmanager.so.4
#37 0x00f2ea85 in TaskManager::TaskManager::windowChanged(unsigned long, unsigned int) () from /usr/lib/libtaskmanager.so.4
#38 0x00f2fa20 in TaskManager::TaskManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#39 0x025d9853 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#40 0x025da4b2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#41 0x03759609 in KWindowSystem::windowChanged(unsigned long, unsigned int) () from /usr/lib/libkdeui.so.5
#42 0x0375cc2f in ?? () from /usr/lib/libkdeui.so.5
#43 0x03609986 in KApplication::x11EventFilter(_XEvent*) () from /usr/lib/libkdeui.so.5
#44 0x03dfb33a in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#45 0x02bca900 in ?? () from /usr/lib/libQtGui.so.4
#46 0x02bdbbf0 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#47 0x02c085d2 in ?? () from /usr/lib/libQtGui.so.4
#48 0x002b7308 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#49 0x002ba9e0 in ?? () from /lib/libglib-2.0.so.0
#50 0x002bab13 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#51 0x025ee5ec in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#52 0x02c07cb5 in ?? () from /usr/lib/libQtGui.so.4
#53 0x025c20d9 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#54 0x025c252a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#55 0x025c49af in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#56 0x02b687f7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#57 0x03de542d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#58 0x080486fb in _start ()

Reported using DrKonqi