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 i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I just updated to KDE 4.3.1 and was moving the "folder view" plasmoid when Plasma crashed. 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 10463)]

Thread 2 (Thread 0xa934eb90 (LWP 10468)):
#0  0xb7ef3430 in __kernel_vsyscall ()
#1  0xb64060e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb65e62ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7cec172 in QWaitCondition::wait (this=0x9308af8, mutex=0x9308af4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb7629ac2 in QHostInfoAgent::run (this=0x9308ae8) at kernel/qhostinfo.cpp:260
#5  0xb7ceb132 in QThreadPrivate::start (arg=0x9308ae8) at thread/qthread_unix.cpp:188
#6  0xb64024ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb65d749e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f0fa10 (LWP 10463)):
[KCrash Handler]
#6  0xb68e51fe in QWidget::testAttribute_helper (this=0x19, attribute=Qt::WA_RightToLeft) at kernel/qwidget.cpp:9976
#7  0xb68ea545 in QWidget::layoutDirection (this=0x19) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:997
#8  0xb6ee5038 in QGraphicsViewPrivate::updateScroll (this=0x90c8df8) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:404
#9  0xb6ee522b in QGraphicsViewPrivate::horizontalScroll (this=0x90c8df8) at graphicsview/qgraphicsview.cpp:518
#10 0xb6ee5380 in QGraphicsView::mapFromScene (this=0x9e718d8, point=@0xbfa0e708) at graphicsview/qgraphicsview.cpp:2520
#11 0xb5cc8252 in Plasma::AppletHandle::mousePressEvent (this=0x9e453c0, event=0xbfa0ee64) at /build/buildd/kde4libs-4.3.1/plasma/private/applethandle.cpp:492
#12 0xb6eaa15a in QGraphicsItem::sceneEvent (this=0x9e453c8, event=0xbfa0ee64) at graphicsview/qgraphicsitem.cpp:5027
#13 0xb6ecf7bc in QGraphicsScenePrivate::sendEvent (this=0x8cf3750, item=0x9e453c8, event=0xbfa0ee64) at graphicsview/qgraphicsscene.cpp:1159
#14 0xb6ed0e22 in QGraphicsScenePrivate::sendMouseEvent (this=0x8cf3750, mouseEvent=0xbfa0ee64) at graphicsview/qgraphicsscene.cpp:1230
#15 0xb6edc42b in QGraphicsScenePrivate::mousePressEventHandler (this=0x8cf3750, mouseEvent=0xbfa0ee64) at graphicsview/qgraphicsscene.cpp:1319
#16 0xb6edd0aa in QGraphicsScene::event (this=0x8d0f8a0, event=0xbfa0ee64) at graphicsview/qgraphicsscene.cpp:3805
#17 0xb689cd3c in QApplicationPrivate::notify_helper (this=0x8c178e8, receiver=0x8d0f8a0, e=0xbfa0ee64) at kernel/qapplication.cpp:4056
#18 0xb68a503e in QApplication::notify (this=0x8c11c68, receiver=0x8d0f8a0, e=0xbfa0ee64) at kernel/qapplication.cpp:3603
#19 0xb73ad85d in KApplication::notify (this=0x8c11c68, receiver=0x8d0f8a0, event=0xbfa0ee64) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#20 0xb7ddfbcb in QCoreApplication::notifyInternal (this=0x8c11c68, receiver=0x8d0f8a0, event=0xbfa0ee64) at kernel/qcoreapplication.cpp:610
#21 0xb6eeaeeb in QGraphicsView::mousePressEvent (this=0x8fab438, event=0xbfa0f468) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#22 0xb68f3a76 in QWidget::event (this=0x8fab438, event=0xbfa0f468) at kernel/qwidget.cpp:7545
#23 0xb6ca4a53 in QFrame::event (this=0x8fab438, e=0xbfa0f468) at widgets/qframe.cpp:559
#24 0xb6d44c2f in QAbstractScrollArea::viewportEvent (this=0x8fab438, e=0x19) at widgets/qabstractscrollarea.cpp:962
#25 0xb6eef9b2 in QGraphicsView::viewportEvent (this=0x8fab438, event=0xbfa0f468) at graphicsview/qgraphicsview.cpp:2919
#26 0xb6d47235 in QAbstractScrollAreaFilter::eventFilter (this=0x8f83f48, o=0x8f82de8, e=0xbfa0f468) at widgets/qabstractscrollarea_p.h:100
#27 0xb7ddedea in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8c178e8, receiver=0x8f82de8, event=0xbfa0f468) at kernel/qcoreapplication.cpp:726
#28 0xb689cd1a in QApplicationPrivate::notify_helper (this=0x8c178e8, receiver=0x8f82de8, e=0xbfa0f468) at kernel/qapplication.cpp:4052
#29 0xb68a59b1 in QApplication::notify (this=0x8c11c68, receiver=0x8f82de8, e=0xbfa0f468) at kernel/qapplication.cpp:3758
#30 0xb73ad85d in KApplication::notify (this=0x8c11c68, receiver=0x8f82de8, event=0xbfa0f468) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#31 0xb7ddfbcb in QCoreApplication::notifyInternal (this=0x8c11c68, receiver=0x8f82de8, event=0xbfa0f468) at kernel/qcoreapplication.cpp:610
#32 0xb68a4a1e in QApplicationPrivate::sendMouseEvent (receiver=0x8f82de8, event=0xbfa0f468, alienWidget=0x8f82de8, nativeWidget=0x8fab438, buttonDown=0xb711eaa0, lastMouseReceiver=@0xb711eaa4)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#33 0xb6914cce in QETWidget::translateMouseEvent (this=0x8fab438, event=0xbfa10afc) at kernel/qapplication_x11.cpp:4409
#34 0xb6914085 in QApplication::x11ProcessEvent (this=0x8c11c68, event=0xbfa10afc) at kernel/qapplication_x11.cpp:3428
#35 0xb693f37a in x11EventSourceDispatch (s=0x8c1a700, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#36 0xb644fb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#37 0xb64530eb in ?? () from /usr/lib/libglib-2.0.so.0
#38 0xb6453268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#39 0xb7e0b2f8 in QEventDispatcherGlib::processEvents (this=0x8c17440, flags={i = -1079964488}) at kernel/qeventdispatcher_glib.cpp:327
#40 0xb693ea75 in QGuiEventDispatcherGlib::processEvents (this=0x8c17440, flags={i = -1079964440}) at kernel/qguieventdispatcher_glib.cpp:202
#41 0xb7dde1fa in QEventLoop::processEvents (this=0xbfa10d60, flags={i = -1079964376}) at kernel/qeventloop.cpp:149
#42 0xb7dde642 in QEventLoop::exec (this=0xbfa10d60, flags={i = -1079964312}) at kernel/qeventloop.cpp:201
#43 0xb7de0ae9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#44 0xb689cbb7 in QApplication::exec () at kernel/qapplication.cpp:3525
#45 0xb4a60310 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#46 0x0804e27d in launch (argc=1, _name=0x8bb057c "/usr/bin/plasma-desktop", args=0x8bb0594 "", cwd=0x0, envc=0, envs=0x8bb0598 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805136d "0") at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:677
#47 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1169
#48 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1362
#49 0x0804fbca in main (argc=2, argv=0xbfa11554, envp=0xbfa11560) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1793

Reported using DrKonqi