Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.96 (KDE 4.2.96 (KDE 4.3 RC2))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
plasma crashed while I tried to configure some widgets.

A strange thing was before that one of the widgets suddently disappeard (public transport plasmoid). I used this widget twice with different settings. 

The crash occured while using the social desktop widget.

After reloading I got 3 public transport plasmoids - and different sizes of the widgets.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 18126)]

Thread 2 (Thread 0xa8e0cb90 (LWP 18127)):
#0  0xb803f430 in __kernel_vsyscall ()
#1  0xb65220e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67022ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e2b5b2 in QWaitCondition::wait (this=0x998e660, mutex=0x998e65c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb776eae2 in QHostInfoAgent::run (this=0x998e650) at kernel/qhostinfo.cpp:260
#5  0xb7e2a56e in QThreadPrivate::start (arg=0x998e650) at thread/qthread_unix.cpp:189
#6  0xb651e4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb66f349e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb602ca10 (LWP 18126)):
[KCrash Handler]
#6  QGraphicsItemPrivate::updateCachedClipPathFromSetPosHelper (this=0x13cfdb48, newPos=@0xbf95a8c0) at graphicsview/qgraphicsitem.cpp:3891
#7  0xb6ff71a5 in QGraphicsItemPrivate::setPosHelper (this=0x13cfdb48, pos=@0xbf95aa20) at graphicsview/qgraphicsitem.cpp:2367
#8  0xb7041f18 in QGraphicsWidget::setGeometry (this=0x13d92ef8, rect=@0xbf95ab40) at graphicsview/qgraphicswidget.cpp:382
#9  0xb70493db in QGridLayoutItem::setGeometry (this=0x13f522d8, rect=@0xbf95ab40) at graphicsview/qgridlayoutengine.cpp:650
#10 0xb704f3e2 in QGridLayoutEngine::setGeometries (this=0xac601b8, styleInfo=@0xbf95abcc, contentsGeometry=@0xbf95aba8) at graphicsview/qgridlayoutengine.cpp:1030
#11 0xb703da54 in QGraphicsLinearLayout::setGeometry (this=0xc8a1838, rect=@0xbf95ac28) at graphicsview/qgraphicslinearlayout.cpp:503
#12 0xb703aaef in QGraphicsLayout::activate (this=0xc8a1838) at graphicsview/qgraphicslayout.cpp:269
#13 0xb703ab6c in QGraphicsLayout::widgetEvent (this=0xc8a1838, e=0x13c6d5e0) at graphicsview/qgraphicslayout.cpp:366
#14 0xb7041213 in QGraphicsWidget::event (this=0xac5fe30, event=0x13c6d5e0) at graphicsview/qgraphicswidget.cpp:1262
#15 0xb69b8bcc in QApplicationPrivate::notify_helper (this=0x941b6e0, receiver=0xac5fe30, e=0x13c6d5e0) at kernel/qapplication.cpp:4057
#16 0xb69c0ede in QApplication::notify (this=0x9415910, receiver=0xac5fe30, e=0x13c6d5e0) at kernel/qapplication.cpp:3604
#17 0xb74f24dd in KApplication::notify (this=0x9415910, receiver=0xac5fe30, event=0x13c6d5e0) at /build/buildd/kde4libs-4.2.96/kdeui/kernel/kapplication.cpp:302
#18 0xb7f1e7ab in QCoreApplication::notifyInternal (this=0x9415910, receiver=0xac5fe30, event=0x13c6d5e0) at kernel/qcoreapplication.cpp:610
#19 0xb7f1f405 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x93d0c40) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#20 0xb7f1f5fd in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#21 0xb7f4a58f in postEventSourceDispatch (s=0x94202b0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#22 0xb656bb88 in IA__g_main_context_dispatch (context=0x9420000) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#23 0xb656f0eb in g_main_context_iterate (context=0x9420000, block=1, dispatch=1, self=0x941b150) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#24 0xb656f268 in IA__g_main_context_iteration (context=0x9420000, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#25 0xb7f4a1d8 in QEventDispatcherGlib::processEvents (this=0x941b410, flags={i = -1080708600}) at kernel/qeventdispatcher_glib.cpp:324
#26 0xb6a5a765 in QGuiEventDispatcherGlib::processEvents (this=0x941b410, flags={i = -1080708552}) at kernel/qguieventdispatcher_glib.cpp:202
#27 0xb7f1cdda in QEventLoop::processEvents (this=0xbf95b2b0, flags={i = -1080708488}) at kernel/qeventloop.cpp:149
#28 0xb7f1d21a in QEventLoop::exec (this=0xbf95b2b0, flags={i = -1080708424}) at kernel/qeventloop.cpp:200
#29 0xb7f1f6c9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0xb69b8a47 in QApplication::exec () at kernel/qapplication.cpp:3526
#31 0xb4b8a5d0 in kdemain (argc=1, argv=0x93ff1b8) at /build/buildd/kdebase-workspace-4.2.96/plasma/shells/desktop/main.cpp:50
#32 0x0804e27d in launch (argc=1, _name=0x93d16bc "/usr/bin/plasma-desktop", args=0x93d16d4 "", cwd=0x0, envc=0, envs=0x93d16d8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051391 "0") at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:676
#33 0x0804ea5d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:1168
#34 0x0804efe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:1361
#35 0x0804fbca in main (argc=2, argv=0xbf95baa4, envp=0xbf95bab0) at /build/buildd/kde4libs-4.2.96/kinit/kinit.cpp:1788

Reported using DrKonqi