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 2.6.31-19-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
i was opening 6 pdf files and 1 doc file simultaneously, when the crash happened, but it took the system less than 2 sec to recover.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7797700 (LWP 1498))]

Thread 2 (Thread 0xab809b70 (LWP 1501)):
#0  0x00265422 in __kernel_vsyscall ()
#1  0x0013ee15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x061b087d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x005a9e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x01a03922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x005a8e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0013a80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x061a38de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7797700 (LWP 1498)):
[KCrash Handler]
#6  0x00690061 in QAbstractItemModel::mimeData(QList<QModelIndex> const&) const () from /usr/lib/libQtCore.so.4
#7  0x0175f324 in ?? () from /usr/lib/libQtGui.so.4
#8  0x0177b0a7 in QGraphicsGridLayout::addItem(QGraphicsLayoutItem*, int, int, int, int, QFlags<Qt::AlignmentFlag>) () from /usr/lib/libQtGui.so.4
#9  0x07aa174a in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0x07aa1e2a in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#11 0x07aa200f in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#12 0x07aaefa2 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#13 0x07aaf627 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#14 0x006af263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x006afec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#16 0x02141433 in TaskManager::TaskGroup::itemAdded(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#17 0x02141e8b in TaskManager::TaskGroup::add(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#18 0x0212651e in TaskManager::AbstractGroupingStrategy::closeGroup(TaskManager::TaskGroup*) () from /usr/lib/libtaskmanager.so.4
#19 0x0212dfec in ?? () from /usr/lib/libtaskmanager.so.4
#20 0x0212ef4d in ?? () from /usr/lib/libtaskmanager.so.4
#21 0x006af263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#22 0x006afec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#23 0x021413e3 in TaskManager::TaskGroup::itemRemoved(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#24 0x02141c0b in TaskManager::TaskGroup::remove(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#25 0x0212971d in ?? () from /usr/lib/libtaskmanager.so.4
#26 0x0212b52b in TaskManager::GroupManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#27 0x006af263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#28 0x006afec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#29 0x02144e33 in TaskManager::TaskManager::taskRemoved(KSharedPtr<TaskManager::Task>) () from /usr/lib/libtaskmanager.so.4
#30 0x02146bb2 in TaskManager::TaskManager::windowRemoved(unsigned long) () from /usr/lib/libtaskmanager.so.4
#31 0x021484ff in TaskManager::TaskManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#32 0x006af263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#33 0x006afec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#34 0x00f7add3 in KWindowSystem::windowRemoved(unsigned long) () from /usr/lib/libkdeui.so.5
#35 0x00f7e036 in ?? () from /usr/lib/libkdeui.so.5
#36 0x00f8c53f in NETRootInfo::update(unsigned long const*) () from /usr/lib/libkdeui.so.5
#37 0x00f8d0b7 in NETRootInfo::event(_XEvent*, unsigned long*, int) () from /usr/lib/libkdeui.so.5
#38 0x00f7e2d1 in ?? () from /usr/lib/libkdeui.so.5
#39 0x00e2af86 in KApplication::x11EventFilter(_XEvent*) () from /usr/lib/libkdeui.so.5
#40 0x01ea471a in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#41 0x0116dd70 in ?? () from /usr/lib/libQtGui.so.4
#42 0x0117f375 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#43 0x011ad502 in ?? () from /usr/lib/libQtGui.so.4
#44 0x001c7e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#45 0x001cb730 in ?? () from /lib/libglib-2.0.so.0
#46 0x001cb863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#47 0x006c402c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#48 0x011acbe5 in ?? () from /usr/lib/libQtGui.so.4
#49 0x00697c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#50 0x006980ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#51 0x0069a53f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#52 0x0110bdd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#53 0x01e8e80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#54 0x0804dde1 in _start ()

Reported using DrKonqi