Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
All I did was I tried to shift+delete two folders on the desktop (not the widget). The deletion succeded but then the screen flickered, went black, shrunk to 1 quarter of the whole screen, gave me bug report dialog and then it fixed itself.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3727)]

Thread 2 (Thread 0x7fd6823bc950 (LWP 3728)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fd6a15b3d19 in QWaitCondition::wait (this=0x1831560, mutex=0x1831558, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007fd6a043981c in QHostInfoAgent::run (this=0x1831540) at kernel/qhostinfo.cpp:260
#3  0x00007fd6a15b2d35 in QThreadPrivate::start (arg=0x1831540) at thread/qthread_unix.cpp:188
#4  0x00007fd69d4a73ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fd69e08bfcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd6a1b78750 (LWP 3727)):
[KCrash Handler]
#5  0x00007fd69f22ad5f in QGraphicsScene::drawItems (this=<value optimized out>, painter=0x7fffa9baeb10, numItems=2, items=0x2aacff0, options=0x2be6b70, widget=0x1e40020)
    at graphicsview/qgraphicsscene.cpp:5020
#6  0x00007fd69f24c7b8 in QGraphicsView::paintEvent (this=0x2ad3710, event=<value optimized out>) at graphicsview/qgraphicsview.cpp:3528
#7  0x00007fd69ecb3ed6 in QWidget::event (this=0x2ad3710, event=0x7fffa9baf2c0) at kernel/qwidget.cpp:7687
#8  0x00007fd69f026f0b in QFrame::event (this=0x2ad3710, e=0x7fffa9baf2c0) at widgets/qframe.cpp:559
#9  0x00007fd69f24b30b in QGraphicsView::viewportEvent (this=0x2ad3710, event=0x7fffa9baf2c0) at graphicsview/qgraphicsview.cpp:2919
#10 0x00007fd6a169b9b8 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x1e40020, event=0x7fffa9baf2c0) at kernel/qcoreapplication.cpp:726
#11 0x00007fd69ec62f1c in QApplicationPrivate::notify_helper (this=0xffcae0, receiver=0x1e40020, e=0x7fffa9baf2c0) at kernel/qapplication.cpp:4052
#12 0x00007fd69ec6b18a in QApplication::notify (this=0xfbdc60, receiver=0x1e40020, e=0x7fffa9baf2c0) at kernel/qapplication.cpp:4021
#13 0x00007fd69fd75deb in KApplication::notify (this=0xfbdc60, receiver=0x1e40020, event=0x7fffa9baf2c0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#14 0x00007fd6a169c6ac in QCoreApplication::notifyInternal (this=0xfbdc60, receiver=0x1e40020, event=0x7fffa9baf2c0) at kernel/qcoreapplication.cpp:610
#15 0x00007fd69ecbb125 in QWidgetPrivate::drawWidget (this=0x2bae7b0, pdev=0x2bb68b8, rgn=@0x7fffa9baf4f0, offset=@0x7fffa9baf4e0, flags=4, sharedPainter=0x0, backingStore=0x2bb9340)
    at kernel/qwidget.cpp:5079
#16 0x00007fd69ecbb897 in QWidgetPrivate::paintSiblingsRecursive (this=0x2b6bed0, pdev=0x2bb68b8, siblings=@0x2b6bee8, index=2, rgn=@0x7fffa9baf800, offset=@0x7fffa9baf7f0, flags=4, 
    sharedPainter=0x0, backingStore=0x2bb9340) at kernel/qwidget.cpp:5189
#17 0x00007fd69ecbad97 in QWidgetPrivate::drawWidget (this=0x2b6bed0, pdev=0x2bb68b8, rgn=@0x7fffa9baf800, offset=@0x7fffa9baf7f0, flags=4, sharedPainter=0x0, backingStore=0x2bb9340)
    at kernel/qwidget.cpp:5128
#18 0x00007fd69ecbb897 in QWidgetPrivate::paintSiblingsRecursive (this=0x2baedb0, pdev=0x2bb68b8, siblings=@0x2baedc8, index=3, rgn=@0x7fffa9bafc70, offset=@0x2bb9384, flags=4, sharedPainter=0x0, 
    backingStore=0x2bb9340) at kernel/qwidget.cpp:5189
#19 0x00007fd69ecbad97 in QWidgetPrivate::drawWidget (this=0x2baedb0, pdev=0x2bb68b8, rgn=@0x7fffa9bafc70, offset=@0x2bb9384, flags=4, sharedPainter=0x0, backingStore=0x2bb9340)
    at kernel/qwidget.cpp:5128
#20 0x00007fd69ee35902 in QWidgetBackingStore::sync (this=0x2bb9340) at painting/qbackingstore.cpp:1269
#21 0x00007fd69ecace00 in QWidgetPrivate::syncBackingStore (this=0x2baedb0) at kernel/qwidget.cpp:1603
#22 0x00007fd69ecb3d6d in QWidget::event (this=0x2b91c10, event=0x2b789b0) at kernel/qwidget.cpp:7827
#23 0x00007fd69ec62f4d in QApplicationPrivate::notify_helper (this=0xffcae0, receiver=0x2b91c10, e=0x2b789b0) at kernel/qapplication.cpp:4056
#24 0x00007fd69ec6b18a in QApplication::notify (this=0xfbdc60, receiver=0x2b91c10, e=0x2b789b0) at kernel/qapplication.cpp:4021
#25 0x00007fd69fd75deb in KApplication::notify (this=0xfbdc60, receiver=0x2b91c10, event=0x2b789b0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#26 0x00007fd6a169c6ac in QCoreApplication::notifyInternal (this=0xfbdc60, receiver=0x2b91c10, event=0x2b789b0) at kernel/qcoreapplication.cpp:610
#27 0x00007fd6a169d31a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xf70320) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#28 0x00007fd6a16c5e03 in postEventSourceDispatch (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#29 0x00007fd69d6f620a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007fd69d6f98e0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007fd69d6f9a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007fd6a16c5a8f in QEventDispatcherGlib::processEvents (this=0xffc610, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#33 0x00007fd69ecfbbdf in QGuiEventDispatcherGlib::processEvents (this=0x7fffa9bae620, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007fd6a169af42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -1447360768}) at kernel/qeventloop.cpp:149
#35 0x00007fd6a169b314 in QEventLoop::exec (this=0x7fffa9bb0740, flags={i = -1447360688}) at kernel/qeventloop.cpp:201
#36 0x00007fd6a169d5e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x00007fd6955bf3eb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#38 0x0000000000407215 in launch (argc=1, _name=0xfb1068 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0xfb1088 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a3a1 "0") at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:677
#39 0x0000000000407a38 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1169
#40 0x0000000000407fe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1362
#41 0x0000000000408b26 in main (argc=2, argv=0x7fffa9bb15e8, envp=0x7fffa9bb1600) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1793

Reported using DrKonqi