Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-15-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
just exploring folder and check diskspace aviable, suddenly i got a black screen for 5 10 seconds and got the error from system.

 -- Backtrace:
Application: Spazio di lavoro di Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7790700 (LWP 1668))]

Thread 2 (Thread 0xab647b70 (LWP 1671)):
#0  0x0093e422 in __kernel_vsyscall ()
#1  0x00386e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0080a78d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00d62e67 in QWaitConditionPrivate::wait (this=0x8dd1fc8, mutex=0x8dd1fc4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8dd1fc8, mutex=0x8dd1fc4, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x00c3d922 in QHostInfoAgent::run (this=0x8dd1fb8) at kernel/qhostinfo.cpp:260
#6  0x00d61e32 in QThreadPrivate::start (arg=0x8dd1fb8) at thread/qthread_unix.cpp:188
#7  0x0038280e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x007fd7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7790700 (LWP 1668)):
[KCrash Handler]
#6  KDirModelNode::rowNumber (this=0x0) at ../../kio/kio/kdirmodel.cpp:120
#7  0x00a3eb93 in KDirModelPrivate::indexForNode (this=0x967a5d0, node=0x0, rowNumber=0) at ../../kio/kio/kdirmodel.cpp:284
#8  0x00a439bb in KDirModelPrivate::_k_slotNewItems (this=0x967a5d0, directoryUrl=..., items=...) at ../../kio/kio/kdirmodel.cpp:377
#9  0x00a44ec7 in KDirModel::qt_metacall (this=0x9679590, _c=QMetaObject::InvokeMetaMethod, _id=22, _a=0xbff33004) at ./kdirmodel.moc:82
#10 0x05dc9c82 in ?? () from /usr/lib/kde4/plasma_applet_quickaccess.so
#11 0x00e68263 in QMetaObject::activate (sender=0x9679c08, from_signal_index=14, to_signal_index=14, argv=0xbff33004) at kernel/qobject.cpp:3113
#12 0x00e68ec2 in QMetaObject::activate (sender=0x9679c08, m=0xbb903c, local_signal_index=10, argv=0xbff33004) at kernel/qobject.cpp:3187
#13 0x00a275b9 in KDirLister::itemsAdded (this=0x9679c08, _t1=..., _t2=...) at ./kdirlister.moc:268
#14 0x00a2864e in KDirLister::Private::emitItems (this=0x9679a40) at ../../kio/kio/kdirlister.cpp:2303
#15 0x00a33937 in KDirListerCache::processPendingUpdates (this=0x8cd82a8) at ../../kio/kio/kdirlister.cpp:1796
#16 0x00a341ff in KDirListerCache::slotFilesChanged (this=0x8cd82a8, fileList=...) at ../../kio/kio/kdirlister.cpp:850
#17 0x00a3a9f5 in KDirListerCache::qt_metacall (this=0x8cd82a8, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbff33308) at ./kdirlister_p.moc:93
#18 0x00e68263 in QMetaObject::activate (sender=0x8ca2fb0, from_signal_index=8, to_signal_index=8, argv=0xbff33308) at kernel/qobject.cpp:3113
#19 0x00e68ec2 in QMetaObject::activate (sender=0x8ca2fb0, m=0xbb9294, local_signal_index=3, argv=0xbff33308) at kernel/qobject.cpp:3187
#20 0x00a46653 in OrgKdeKDirNotifyInterface::FilesChanged (this=0x8ca2fb0, _t1=...) at ./kdirnotify.moc:118
#21 0x00a46825 in OrgKdeKDirNotifyInterface::qt_metacall (this=0x8ca2fb0, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbff3348c) at ./kdirnotify.moc:82
#22 0x0593f7b4 in QDBusConnectionPrivate::deliverCall (this=0x88d11f0, object=0x8ca2fb0, msg=..., metaTypes=..., slotIdx=8) at qdbusintegrator.cpp:891
#23 0x05947197 in QDBusCallDeliveryEvent::placeMetaCall(QObject*) () from /usr/lib/libQtDBus.so.4
#24 0x00e625fe in QObject::event (this=0x8ca2fb0, e=0x9814648) at kernel/qobject.cpp:1111
#25 0x06c5cf54 in QApplicationPrivate::notify_helper (this=0x88d6308, receiver=0x8ca2fb0, e=0x9814648) at kernel/qapplication.cpp:4056
#26 0x06c6467c in QApplication::notify (this=0x88d0338, receiver=0x8ca2fb0, e=0x9814648) at kernel/qapplication.cpp:3603
#27 0x0111914a in KApplication::notify (this=0x88d0338, receiver=0x8ca2fb0, event=0x9814648) at ../../kdeui/kernel/kapplication.cpp:302
#28 0x00e526cb in QCoreApplication::notifyInternal (this=0x88d0338, receiver=0x8ca2fb0, event=0x9814648) at kernel/qcoreapplication.cpp:610
#29 0x00e532b2 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x8847e48) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#30 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8847e48) at kernel/qcoreapplication.cpp:1247
#31 0x00e5347d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#32 0x00e7d3ff in QCoreApplication::sendPostedEvents (s=0x88d8310) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#33 postEventSourceDispatch (s=0x88d8310) at kernel/qeventdispatcher_glib.cpp:210
#34 0x008ade78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#35 0x008b1720 in ?? () from /lib/libglib-2.0.so.0
#36 0x008b1853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#37 0x00e7d02c in QEventDispatcherGlib::processEvents (this=0x88d60f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#38 0x06cfdbe5 in QGuiEventDispatcherGlib::processEvents (this=0x88d60f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#39 0x00e50c79 in QEventLoop::processEvents (this=0xbff33bf4, flags=) at kernel/qeventloop.cpp:149
#40 0x00e510ca in QEventLoop::exec (this=0xbff33bf4, flags=...) at kernel/qeventloop.cpp:201
#41 0x00e5353f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#42 0x06c5cdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#43 0x02a1c80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#44 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x885f3e8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#45 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#46 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#47 0x0804fbaf in main (argc=2, argv=0xbff34454, envp=0xbff34460) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi