Version:            (using KDE 4.2.4)
Installed from:    Unlisted Binary Package

Plasma Workspace crashed while I was using firefox (3.5)
After reboot bug persisted, plasma was crashing still. After splash screen I get KDE crash handler saying that Plasma Workspace crashed with signal 8 (SIGFPE)

Backtrace:
Application: Plasma Workspace (plasma), signal SIGFPE                                                                                                                                                                                        
0x00007fc8ce0c2961 in nanosleep () from /lib/libc.so.6                                                                                                                                                                                       
[Current thread is 0 (LWP 4380)]                                                                                                                                                                                                             
                                                                                                                                                                                                                                             
Thread 8 (Thread 0x7fc8aa666910 (LWP 4381)):                                                                                                                                                                                                 
#0  0x00007fc8c7f5005d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0                                                                                                                                                   
#1  0x00007fc8af0d8581 in metronom_sync_loop () from /usr/lib/libxine.so.1                                                                                                                                                                   
#2  0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0                                                                                                                                                                          
#3  0x00007fc8ce0f116d in clone () from /lib/libc.so.6                                                                                                                                                                                       
#4  0x0000000000000000 in ?? ()                                                                                                                                                                                                              
                                                                                                                                                                                                                                             
Thread 7 (Thread 0x7fc8a980b910 (LWP 4382)):                                                                                                                                                                                                 
#0  0x00007fff1c3ff71c in clock_gettime ()                                                                                                                                                                                                   
#1  0x00007fc8c65d9e4f in clock_gettime () from /lib/librt.so.1                                                                                                                                                                              
#2  0x00007fc8cb46b9ed in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#3  0x00007fc8cb46bbe1 in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#4  0x00007fc8cb46d0a3 in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#5  0x00007fc8cb46a09d in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#6  0x00007fc8c634fd8a in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0                                                                                                                                                           
#7  0x00007fc8c6350161 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0                                                                                                                                                           
#8  0x00007fc8c6350690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0                                                                                                                                                         
#9  0x00007fc8cb469f1e in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4                                                                                                                                                
#10 0x00007fc8cb4402c2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4                                                                                                                                                          
#11 0x00007fc8cb440694 in QEventLoop::exec () from /usr/lib/libQtCore.so.4                                                                                                                                                                   
#12 0x00007fc8cb35953b in QThread::exec () from /usr/lib/libQtCore.so.4                                                                                                                                                                      
#13 0x00007fc8af331414 in Phonon::Xine::XineThread::run () from /usr/lib/kde4/plugins/phonon_backend/phonon_xine.so                                                                                                                          
#14 0x00007fc8cb35c285 in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#15 0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0                                                                                                                                                                          
#16 0x00007fc8ce0f116d in clone () from /lib/libc.so.6                                                                                                                                                                                       
#17 0x0000000000000000 in ?? ()                                                                                                                                                                                                              
                                                                                                                                                                                                                                             
Thread 6 (Thread 0x7fc8a8e01910 (LWP 4385)):                                                                                                                                                                                                 
#0  0x00007fc8ce0e89b3 in poll () from /lib/libc.so.6                                                                                                                                                                                        
#1  0x00007fc8a8e06839 in ao_alsa_handle_event_thread () from /usr/lib/xine/plugins/1.26/xineplug_ao_out_alsa.so                                                                                                                             
#2  0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0                                                                                                                                                                          
#3  0x00007fc8ce0f116d in clone () from /lib/libc.so.6                                                                                                                                                                                       
#4  0x0000000000000000 in ?? ()                                                                                                                                                                                                              
                                                                                                                                                                                                                                             
Thread 5 (Thread 0x7fc8a8600910 (LWP 4386)):                                                                                                                                                                                                 
#0  0x00007fc8c7f4fdd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0                                                                                                                                                        
#1  0x00007fc8af0e95c3 in ao_loop () from /usr/lib/libxine.so.1                                                                                                                                                                              
#2  0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0                                                                                                                                                                          
#3  0x00007fc8ce0f116d in clone () from /lib/libc.so.6                                                                                                                                                                                       
#4  0x0000000000000000 in ?? ()                                                                                                                                                                                                              
                                                                                                                                                                                                                                             
Thread 4 (Thread 0x7fc8a7be8910 (LWP 4387)):                                                                                                                                                                                                 
#0  0x00007fc8c7f4fdd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0                                                                                                                                                        
#1  0x00007fc8cb35d33b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4                                                                                                                                                               
#2  0x00007fc8c860534c in ?? () from /usr/lib/libQtNetwork.so.4                                                                                                                                                                              
#3  0x00007fc8cb35c285 in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#4  0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0                                                                                                                                                                          
#5  0x00007fc8ce0f116d in clone () from /lib/libc.so.6                                                                                                                                                                                       
#6  0x0000000000000000 in ?? ()                                                                                                                                                                                                              
                                                                                                                                                                                                                                             
Thread 3 (Thread 0x7fc8a4b0d910 (LWP 4402)):                                                                                                                                                                                                 
#0  0x00007fc8ce0eaa62 in select () from /lib/libc.so.6                                                                                                                                                                                      
#1  0x00007fc8cb421041 in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#2  0x00007fc8cb35c285 in ?? () from /usr/lib/libQtCore.so.4                                                                                                                                                                                 
#3  0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0
#4  0x00007fc8ce0f116d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fc8a5b5e910 (LWP 4404)):
#0  0x00007fc8c7f4fdd9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fc8cb35d33b in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fc8b35508a8 in RenderThread::run () from /usr/lib/kde4/plasma_wallpaper_image.so
#3  0x00007fc8cb35c285 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fc8c7f4b57a in start_thread () from /lib/libpthread.so.0
#5  0x00007fc8ce0f116d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc8c29647a0 (LWP 4380)):
[KCrash Handler]
#5  0x00007fc8b1f7d2d2 in Marble::AbstractScanlineTextureMapper::nextTile () from /usr/lib/libmarblewidget.so.4
#6  0x00007fc8b1f7dc1e in Marble::AbstractScanlineTextureMapper::pixelValue () from /usr/lib/libmarblewidget.so.4
#7  0x00007fc8b1f8036e in Marble::EquirectScanlineTextureMapper::mapTexture () from /usr/lib/libmarblewidget.so.4
#8  0x00007fc8b1f16a43 in Marble::MarbleModel::paintGlobe () from /usr/lib/libmarblewidget.so.4
#9  0x00007fc8b1f1e5cc in Marble::MarbleMapPrivate::paintGround () from /usr/lib/libmarblewidget.so.4
#10 0x00007fc8b1f1f41f in Marble::MarbleMap::paint () from /usr/lib/libmarblewidget.so.4
#11 0x00007fc8b220b724 in Marble::WorldClock::paintInterface () from /usr/lib/kde4/plasma_applet_worldclock.so
#12 0x00007fc8cdcdc72a in Plasma::Applet::paint () from /usr/lib/libplasma.so.3
#13 0x00007fc8cc0e24b5 in ?? () from /usr/lib/libQtGui.so.4
#14 0x00007fc8cc0e27bc in ?? () from /usr/lib/libQtGui.so.4
#15 0x00007fc8cc0f6498 in ?? () from /usr/lib/libQtGui.so.4
#16 0x00007fc8cc0f6d4c in QGraphicsScene::drawItems () from /usr/lib/libQtGui.so.4
#17 0x00007fc8cc1082ae in QGraphicsView::paintEvent () from /usr/lib/libQtGui.so.4
#18 0x00007fc8cbb915e0 in QWidget::event () from /usr/lib/libQtGui.so.4
#19 0x00007fc8cbeeabe6 in QFrame::event () from /usr/lib/libQtGui.so.4
#20 0x00007fc8cc10601b in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#21 0x00007fc8cb440cd7 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#22 0x00007fc8cbb42dec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#23 0x00007fc8cbb4a0ee in QApplication::notify () from /usr/lib/libQtGui.so.4
#24 0x00007fc8ccbcc2a6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#25 0x00007fc8cb4419bc in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#26 0x00007fc8cbb989e3 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#27 0x00007fc8cbb99140 in QWidgetPrivate::paintSiblingsRecursive () from /usr/lib/libQtGui.so.4
#28 0x00007fc8cbb98653 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#29 0x00007fc8cbd08c1e in ?? () from /usr/lib/libQtGui.so.4
#30 0x00007fc8cbd08f39 in ?? () from /usr/lib/libQtGui.so.4
#31 0x00007fc8cbba10e2 in ?? () from /usr/lib/libQtGui.so.4
#32 0x00007fc8cbbae4d1 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0x00007fc8cbbd656c in ?? () from /usr/lib/libQtGui.so.4
#34 0x00007fc8c634cdbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0x00007fc8c6350568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#36 0x00007fc8c6350690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0x00007fc8cb469ec6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0x00007fc8cbbd5d4e in ?? () from /usr/lib/libQtGui.so.4
#39 0x00007fc8cb4402c2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0x00007fc8cb440694 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0x00007fc8cb442849 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0x00007fc8ce3af44f in kdemain () from /usr/lib/libkdeinit4_plasma.so
#43 0x00007fc8ce0449ed in __libc_start_main () from /lib/libc.so.6
#44 0x0000000000400629 in _start ()

NOTE: I've reinstalled KDE, so I'm not able to reproduce this bug.