Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.93 (KDE 4.2.93 (KDE 4.3 >= 20090623)) "release 1"
Qt Version: 4.5.2
Operating System: Linux 2.6.25.20-0.4-pae i686

What I was doing when the application crashed:
After an hour or two of normal use ( listening music with amarok, browsing internet with firefox, writing with kword ), plasma start crashing. After the first crash it reload and then crash again, and never stop crashing until i reboot or log out

 -- Backtrace:
Application: Spazio di lavoro di Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3461)]

Thread 2 (Thread 0xa9230b90 (LWP 3469)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7c9cc15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7cfa592 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb75f2de2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7cf9582 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7c99175 in start_thread () from /lib/libpthread.so.0
#6  0xb65d9dae in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5f7f8e0 (LWP 3461)):
[KCrash Handler]
#6  0xa94d0e60 in TaskManager::TaskGroup::members () from /usr/lib/libtaskmanager.so.4
#7  0xa946d84f in TaskGroupItem::indexOf () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0xa946d8ff in TaskGroupItem::indexOf () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0xa9463fa5 in TaskItemLayout::addTaskItem () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0xa946fcfd in TaskGroupItem::itemAdded () from /usr/lib/kde4/plasma_applet_tasks.so
#11 0xa9470d2c in TaskGroupItem::qt_metacall () from /usr/lib/kde4/plasma_applet_tasks.so
#12 0xb7e03728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0xb7e043b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xa94d0dd3 in TaskManager::TaskGroup::itemAdded () from /usr/lib/libtaskmanager.so.4
#15 0xa94d14fa in TaskManager::TaskGroup::add () from /usr/lib/libtaskmanager.so.4
#16 0xa94b9c58 in TaskManager::GroupManagerPrivate::addStartup () from /usr/lib/libtaskmanager.so.4
#17 0xa94ba402 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#18 0xb7e03728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xb7e043b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0xa94d4553 in TaskManager::TaskManager::startupAdded () from /usr/lib/libtaskmanager.so.4
#21 0xa94d5270 in TaskManager::TaskManager::gotNewStartup () from /usr/lib/libtaskmanager.so.4
#22 0xa94d7c99 in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#23 0xb7e03728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb7e043b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0xb7397689 in KStartupInfo::gotNewStartup () from /usr/lib/libkdeui.so.5
#26 0xb73a104e in KStartupInfo::Private::new_startup_info_internal () from /usr/lib/libkdeui.so.5
#27 0xb73a1559 in KStartupInfo::Private::got_startup_info () from /usr/lib/libkdeui.so.5
#28 0xb73a22a1 in KStartupInfo::Private::got_message () from /usr/lib/libkdeui.so.5
#29 0xb73a23e5 in KStartupInfo::qt_metacall () from /usr/lib/libkdeui.so.5
#30 0xb7e03728 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0xb7e043b2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#32 0xb7415d63 in KXMessages::gotMessage () from /usr/lib/libkdeui.so.5
#33 0xb741724d in KXMessages::x11Event () from /usr/lib/libkdeui.so.5
#34 0xb73781f9 in KApplication::x11EventFilter () from /usr/lib/libkdeui.so.5
#35 0xb4a55237 in PlasmaApp::x11EventFilter () from /usr/lib/libkdeinit4_plasma-desktop.so
#36 0xb68f796e in ?? () from /usr/lib/libQtGui.so.4
#37 0xb690a1df in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#38 0xb693565c in ?? () from /usr/lib/libQtGui.so.4
#39 0xb646c2f9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#40 0xb646f87b in ?? () from /usr/lib/libglib-2.0.so.0
#41 0xb646f9f8 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#42 0xb7e198f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#43 0xb6934d25 in ?? () from /usr/lib/libQtGui.so.4
#44 0xb7dec69a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#45 0xb7decae2 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#46 0xb7deef69 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#47 0xb6894527 in QApplication::exec () from /usr/lib/libQtGui.so.4
#48 0xb4a3f790 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#49 0x0804e1f8 in launch ()
#50 0x0804e9dd in handle_launcher_request ()
#51 0x0804ee6b in handle_requests ()
#52 0x0804fb0a in main ()

Reported using DrKonqi