Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.85 (KDE 4.2.85 (KDE 4.3 Beta1))
Qt Version: 4.5.1
Operating System: Linux 2.6.30-rc6 x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
This happened when the machine was left idle copying files over to another drive. File copy finished notification was there after crash and restart so it may not have anything to do with the crash. 

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 0 (LWP 4448)]

Thread 2 (Thread 0x7faadc00b950 (LWP 4455)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007faaf73aece9 in QWaitCondition::wait (this=0x163da90, mutex=0x163da88, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007faafa9295dc in QHostInfoAgent::run (this=0x163da70) at kernel/qhostinfo.cpp:260
#3  0x00007faaf73add02 in QThreadPrivate::start (arg=0x163da70) at thread/qthread_unix.cpp:189
#4  0x00007faaf3ac43ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007faaf6918fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7faafc040760 (LWP 4448)):
[KCrash Handler]
#5  0x00007faafb6729fb in Plasma::Extender::items (this=0x120cd80) at /build/buildd/kde4libs-4.2.85/plasma/extender.cpp:149
#6  0x00007faafb6737f2 in Plasma::Extender::item (this=<value optimized out>, name=@0x7fffc0696ab0) at /build/buildd/kde4libs-4.2.85/plasma/extender.cpp:180
#7  0x00007faafb6738f9 in Plasma::Extender::group (this=0x7fffc0696a20, name=@0x114f4d0) at /build/buildd/kde4libs-4.2.85/plasma/extender.cpp:191
#8  0x00007faadf1e1900 in SystemTray::Applet::timerEvent (this=0x114f4d0, event=<value optimized out>) at /build/buildd/kdebase-workspace-4.2.85/plasma/applets/systemtray/ui/applet.cpp:610
#9  0x00007faaf74a6bb3 in QObject::event (this=0x114f4d0, e=0x114f4d0) at kernel/qobject.cpp:1082
#10 0x00007faaf81bbe7b in QGraphicsWidget::event (this=0x114f4d0, event=0x7fffc06971d0) at graphicsview/qgraphicswidget.cpp:1340
#11 0x00007faaf7ba0b9d in QApplicationPrivate::notify_helper (this=0xcef8b0, receiver=0x114f4d0, e=0x7fffc06971d0) at kernel/qapplication.cpp:4057
#12 0x00007faaf7ba8dea in QApplication::notify (this=0xcdfb10, receiver=0x114f4d0, e=0x7fffc06971d0) at kernel/qapplication.cpp:4022
#13 0x00007faafa2651ab in KApplication::notify (this=0xcdfb10, receiver=0x114f4d0, event=0x7fffc06971d0) at /build/buildd/kde4libs-4.2.85/kdeui/kernel/kapplication.cpp:307
#14 0x00007faaf7496dfc in QCoreApplication::notifyInternal (this=0xcdfb10, receiver=0x114f4d0, event=0x7fffc06971d0) at kernel/qcoreapplication.cpp:610
#15 0x00007faaf74c3eb6 in QTimerInfoList::activateTimers (this=0xcf37d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#16 0x00007faaf74c05cd in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:164
#17 0x00007faaf1e9420a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007faaf1e978e0 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007faaf1e97a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007faaf74c052f in QEventDispatcherGlib::processEvents (this=0xcc75f0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#21 0x00007faaf7c3970f in QGuiEventDispatcherGlib::processEvents (this=0x7fffc0696a20, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#22 0x00007faaf74956a2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -1066830784}) at kernel/qeventloop.cpp:149
#23 0x00007faaf7495a6d in QEventLoop::exec (this=0x7fffc0697480, flags={i = -1066830704}) at kernel/qeventloop.cpp:200
#24 0x00007faaf7497d34 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#25 0x00007faafbc0f29b in kdemain (argc=1, argv=0x7fffc0697788) at /build/buildd/kdebase-workspace-4.2.85/plasma/shells/desktop/main.cpp:50
#26 0x00007faaf68515a6 in __libc_start_main (main=0x400890 <main>, argc=1, ubp_av=0x7fffc0697788, init=0x4008c0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffc0697778) at libc-start.c:220
#27 0x00000000004007c9 in _start () at ../sysdeps/x86_64/elf/start.S:113