Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.95 (KDE 4.2.95 (KDE 4.3 RC1))
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

What I was doing when the application crashed:
I'm using a twinview setup with another panel on the second screen. When adding the pager to the panel on the second screen plasma-desktop crashed.

Possibly related:
Virtualdesktops <-> Containment association

 -- Backtrace:
Application: Plasma-Arbeitsfläche (plasma-desktop), signal: Segmentation fault
[Current thread is 0 (LWP 3634)]

Thread 2 (Thread 0x7f49c9e67910 (LWP 3638)):
#0  0x00007f49e2395e99 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f49e5ffa34b in QWaitCondition::wait (this=<value optimized out>, mutex=0x130d2f8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f49e2e5934c in QHostInfoAgent::run (this=0x130d2e0) at kernel/qhostinfo.cpp:260
#3  0x00007f49e5ff9295 in QThreadPrivate::start (arg=0x130d2e0) at thread/qthread_unix.cpp:188
#4  0x00007f49e239159a in start_thread () from /lib/libpthread.so.0
#5  0x00007f49e8e2bc3d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f49e94177a0 (LWP 3634)):
[KCrash Handler]
#5  0x00007f49e6d5c334 in QGraphicsItem::isWidget (this=0x241d200) at graphicsview/qgraphicsitem.cpp:1143
#6  0x00007f49e6d5ea79 in QGraphicsItem::isWindow (this=0x241d200) at graphicsview/qgraphicsitem.cpp:1156
#7  0x00007f49e6d92129 in QGraphicsScene::event (this=0xa8a180, event=<value optimized out>) at graphicsview/qgraphicsscene.cpp:3850
#8  0x00007f49e67dfdec in QApplicationPrivate::notify_helper (this=0x8ecac0, receiver=0xa8a180, e=0x7fff7ab68690) at kernel/qapplication.cpp:4056
#9  0x00007f49e67e70be in QApplication::notify (this=0x8d9f80, receiver=0xa8a180, e=0x7fff7ab68690) at kernel/qapplication.cpp:4021
#10 0x00007f49e7894ce6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#11 0x00007f49e60de9bc in QCoreApplication::notifyInternal (this=0x8d9f80, receiver=0xa8a180, event=0x7fff7ab68690) at kernel/qcoreapplication.cpp:610
#12 0x00007f49e6da38c6 in QGraphicsView::viewportEvent (this=0x1495920, event=0x7fff7ab68690) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#13 0x00007f49e60ddcd7 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x14af390, event=0x7fff7ab68690) at kernel/qcoreapplication.cpp:726
#14 0x00007f49e67dfdbc in QApplicationPrivate::notify_helper (this=0x8ecac0, receiver=0x14af390, e=0x7fff7ab68690) at kernel/qapplication.cpp:4052
#15 0x00007f49e67e70be in QApplication::notify (this=0x8d9f80, receiver=0x14af390, e=0x7fff7ab68690) at kernel/qapplication.cpp:4021
#16 0x00007f49e7894ce6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#17 0x00007f49e60de9bc in QCoreApplication::notifyInternal (this=0x8d9f80, receiver=0x14af390, event=0x7fff7ab68690) at kernel/qcoreapplication.cpp:610
#18 0x00007f49e682e9bb in QWidget::event (this=<value optimized out>, event=0x7fff7ab68690) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#19 0x00007f49e6b88356 in QFrame::event (this=0x1495920, e=0x7fff7ab68690) at widgets/qframe.cpp:559
#20 0x00007f49e6c17ac9 in QAbstractScrollArea::event (this=0x1495920, e=0x7fff7ab68690) at widgets/qabstractscrollarea.cpp:918
#21 0x00007f49e67dfdec in QApplicationPrivate::notify_helper (this=0x8ecac0, receiver=0x1495920, e=0x7fff7ab68690) at kernel/qapplication.cpp:4056
#22 0x00007f49e67e70be in QApplication::notify (this=0x8d9f80, receiver=0x1495920, e=0x7fff7ab68690) at kernel/qapplication.cpp:4021
#23 0x00007f49e7894ce6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0x00007f49e60de9bc in QCoreApplication::notifyInternal (this=0x8d9f80, receiver=0x1495920, event=0x7fff7ab68690) at kernel/qcoreapplication.cpp:610
#25 0x00007f49e67ea44b in QApplication::setActiveWindow (act=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#26 0x00007f49e684b5c5 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff7ab69f60) at kernel/qapplication_x11.cpp:3469
#27 0x00007f49e687356c in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007f49e0579dbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0x00007f49e057d568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#30 0x00007f49e057d690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#31 0x00007f49e6106ec6 in QEventDispatcherGlib::processEvents (this=0x8ec5a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#32 0x00007f49e6872d4e in QGuiEventDispatcherGlib::processEvents (this=0x241d200, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f49e60dd2c2 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#34 0x00007f49e60dd694 in QEventLoop::exec (this=0x7fff7ab6a280, flags=) at kernel/qeventloop.cpp:201
#35 0x00007f49e60df849 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x00007f49e90f15af in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#37 0x00007f49e8d7d9ed in __libc_start_main () from /lib/libc.so.6
#38 0x0000000000400629 in _start ()

Reported using DrKonqi