Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was viewing the home folder and while it is calculating the folder size, it crashed. 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4058)]

Thread 2 (Thread 0xa94e7b90 (LWP 4061)):
#0  0xb80ca430 in __kernel_vsyscall ()
#1  0xb65e30e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67c32ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7ec5172 in QWaitCondition::wait (this=0x9e8af48, mutex=0x9e8af44, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb7805ac2 in QHostInfoAgent::run (this=0x9e8af38) at kernel/qhostinfo.cpp:260
#5  0xb7ec4132 in QThreadPrivate::start (arg=0x9e8af38) at thread/qthread_unix.cpp:188
#6  0xb65df4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb67b449e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb60eda10 (LWP 4058)):
[KCrash Handler]
#6  0xb7998148 in KDirModelNode::rowNumber (this=0x0) at /build/buildd/kde4libs-4.3.0/kio/kio/kdirmodel.cpp:120
#7  0xb79981f0 in KDirModelPrivate::indexForNode (this=0x9d61030, node=0x0, rowNumber=-1) at /build/buildd/kde4libs-4.3.0/kio/kio/kdirmodel.cpp:284
#8  0xb799ccce in KDirModelPrivate::_k_slotNewItems (this=0x9d61030, directoryUrl=@0xa49a490, items=@0xa49a498) at /build/buildd/kde4libs-4.3.0/kio/kio/kdirmodel.cpp:377
#9  0xb799e06c in KDirModel::qt_metacall (this=0x9d610c8, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfae72a8) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/kdirmodel.moc:82
#10 0xb7fce1b8 in QMetaObject::activate (sender=0xa046518, from_signal_index=14, to_signal_index=14, argv=0xbfae72a8) at kernel/qobject.cpp:3113
#11 0xb7fcee42 in QMetaObject::activate (sender=0xa046518, m=0xb7b0c01c, local_signal_index=10, argv=0xbfae72a8) at kernel/qobject.cpp:3187
#12 0xb7980b19 in KDirLister::itemsAdded (this=0xa046518, _t1=@0xa49a490, _t2=@0xa49a498) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/kdirlister.moc:268
#13 0xb7981a36 in KDirLister::Private::emitItems (this=0xa0478b8) at /build/buildd/kde4libs-4.3.0/kio/kio/kdirlister.cpp:2303
#14 0xb7984584 in KDirListerCache::processPendingUpdates (this=0x9d0d110) at /build/buildd/kde4libs-4.3.0/kio/kio/kdirlister.cpp:1796
#15 0xb79935ed in KDirListerCache::slotFilesChanged (this=0x9d0d110, fileList=@0xab05ad8) at /build/buildd/kde4libs-4.3.0/kio/kio/kdirlister.cpp:850
#16 0xb79941a2 in KDirListerCache::qt_metacall (this=0x9d0d110, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfae752c) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/kdirlister_p.moc:93
#17 0xb7fce1b8 in QMetaObject::activate (sender=0x9d0d168, from_signal_index=8, to_signal_index=8, argv=0xbfae752c) at kernel/qobject.cpp:3113
#18 0xb7fcee42 in QMetaObject::activate (sender=0x9d0d168, m=0xb7b0c274, local_signal_index=3, argv=0xbfae752c) at kernel/qobject.cpp:3187
#19 0xb799fc23 in OrgKdeKDirNotifyInterface::FilesChanged (this=0x9d0d168, _t1=@0xab05ad8) at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/kdirnotify.moc:118
#20 0xb799fdea in OrgKdeKDirNotifyInterface::qt_metacall (this=0x9d0d168, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0xbfae76c8)
    at /build/buildd/kde4libs-4.3.0/obj-i486-linux-gnu/kio/kdirnotify.moc:82
#21 0xb7373e5a in QDBusConnectionPrivate::deliverCall (this=0x986c108, object=0x9d0d168, msg=@0xa4c1194, metaTypes=@0xa4c1198, slotIdx=8) at qdbusintegrator.cpp:891
#22 0xb737beb7 in QDBusCallDeliveryEvent::placeMetaCall (this=0xa4c1168, object=0x9d0d168) at qdbusintegrator_p.h:101
#23 0xb7fc93b0 in QObject::event (this=0x9d0d168, e=0xa4c1168) at kernel/qobject.cpp:1111
#24 0xb6a79d3c in QApplicationPrivate::notify_helper (this=0x9870ff0, receiver=0x9d0d168, e=0xa4c1168) at kernel/qapplication.cpp:4056
#25 0xb6a8203e in QApplication::notify (this=0x986b3a0, receiver=0x9d0d168, e=0xa4c1168) at kernel/qapplication.cpp:3603
#26 0xb758a5cd in KApplication::notify (this=0x986b3a0, receiver=0x9d0d168, event=0xa4c1168) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#27 0xb7fb8bcb in QCoreApplication::notifyInternal (this=0x986b3a0, receiver=0x9d0d168, event=0xa4c1168) at kernel/qcoreapplication.cpp:610
#28 0xb7fb9825 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x980bb38) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#29 0xb7fb9a1d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#30 0xb7fe46af in postEventSourceDispatch (s=0x98739c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#31 0xb662cb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#32 0xb66300eb in ?? () from /usr/lib/libglib-2.0.so.0
#33 0xb6630268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#34 0xb7fe42f8 in QEventDispatcherGlib::processEvents (this=0x9870d08, flags={i = -1079083832}) at kernel/qeventdispatcher_glib.cpp:327
#35 0xb6b1ba75 in QGuiEventDispatcherGlib::processEvents (this=0x9870d08, flags={i = -1079083784}) at kernel/qguieventdispatcher_glib.cpp:202
#36 0xb7fb71fa in QEventLoop::processEvents (this=0xbfae7d70, flags={i = -1079083720}) at kernel/qeventloop.cpp:149
#37 0xb7fb7642 in QEventLoop::exec (this=0xbfae7d70, flags={i = -1079083656}) at kernel/qeventloop.cpp:201
#38 0xb7fb9ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#39 0xb6a79bb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#40 0xb4c3f120 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#41 0x0804e27d in launch (argc=1, _name=0x980c57c "/usr/bin/plasma-desktop", args=0x980c594 "", cwd=0x0, envc=0, envs=0x980c598 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805136d "0") at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:676
#42 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1168
#43 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1361
#44 0x0804fbca in main (argc=2, argv=0xbfae8564, envp=0xbfae8570) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1788

Reported using DrKonqi