Version:            (using KDE 4.2.3)
Installed from:    Fedora RPMs

Plasma just crashed as I was clicking the pager applet after I had added and removed some widgets from the desktop (and the taskbar). I know this is not really reproducible, but I mainly post this in order to have a place to post the stacktrace. Maybe that helps. Seems like the crash happened while swhitching the focus to the pager applet.

Application: Plasma Workspace (plasma), signal SIGSEGV
0x00007f358c2cff81 in nanosleep () from /lib64/libc.so.6
Current language:  auto; currently c
[Current thread is 1 (Thread 0x7f3591c7e850 (LWP 2864))]

Thread 4 (Thread 0x7f356c7e9950 (LWP 2871)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f358cfb75f9 in QWaitCondition::wait () from /usr/lib64/libQtCore.so.4
#2  0x00007f3590910cec in ?? () from /usr/lib64/libQtNetwork.so.4
#3  0x00007f358cfb6612 in ?? () from /usr/lib64/libQtCore.so.4
#4  0x00007f358cd473da in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f358c30e2bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

Thread 3 (Thread 0x7f356b7cc950 (LWP 2872)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f358cfb75f9 in QWaitCondition::wait () from /usr/lib64/libQtCore.so.4
#2  0x00007f356d0d2e0e in RenderThread::run (this=0x146adf8) at /usr/src/debug/kdebase-workspace-4.2.3/plasma/wallpapers/image/renderthread.cpp:91
#3  0x00007f358cfb6612 in ?? () from /usr/lib64/libQtCore.so.4
#4  0x00007f358cd473da in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f358c30e2bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
Current language:  auto; currently asm

Thread 2 (Thread 0x7f3560213950 (LWP 15442)):
#0  0x00007f358c306aa2 in select () from /lib64/libc.so.6
#1  0x00007f358d07e106 in ?? () from /usr/lib64/libQtCore.so.4
#2  0x00007f358cfb6612 in ?? () from /usr/lib64/libQtCore.so.4
#3  0x00007f358cd473da in start_thread (arg=<value optimized out>) at pthread_create.c:297
#4  0x00007f358c30e2bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

Thread 1 (Thread 0x7f3591c7e850 (LWP 2864)):
[KCrash Handler]
#5  0x00007f35915facee in Plasma::ContainmentPrivate::focusApplet (this=0x11f3c50, applet=0x12c7230) at /usr/src/debug/kdelibs-4.2.3/plasma/containment.cpp:1402
#6  0x00007f35915e8511 in Plasma::Applet::focusInEvent (this=0x12c7230, event=0x7fff99dc83e0) at /usr/src/debug/kdelibs-4.2.3/plasma/applet.cpp:1344
#7  0x00007f358dd5dacd in QGraphicsItem::sceneEvent () from /usr/lib64/libQtGui.so.4
#8  0x00007f358dd84178 in QGraphicsScene::setFocusItem () from /usr/lib64/libQtGui.so.4
#9  0x00007f358dd8fcc9 in ?? () from /usr/lib64/libQtGui.so.4
#10 0x00007f358dd90870 in QGraphicsScene::event () from /usr/lib64/libQtGui.so.4
#11 0x00007f358d79146d in QApplicationPrivate::notify_helper () from /usr/lib64/libQtGui.so.4
#12 0x00007f358d7996ea in QApplication::notify () from /usr/lib64/libQtGui.so.4
#13 0x00007f359004e17b in KApplication::notify () from /usr/lib64/libkdeui.so.5
#14 0x00007f358d09f7dc in QCoreApplication::notifyInternal () from /usr/lib64/libQtCore.so.4
#15 0x00007f358dd9c83d in QGraphicsView::mousePressEvent () from /usr/lib64/libQtGui.so.4
#16 0x00007f358d7e2856 in QWidget::event () from /usr/lib64/libQtGui.so.4
#17 0x00007f358db7e4cb in QFrame::event () from /usr/lib64/libQtGui.so.4
#18 0x00007f358dda0f9b in QGraphicsView::viewportEvent () from /usr/lib64/libQtGui.so.4
#19 0x00007f358d09eae8 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib64/libQtCore.so.4
#20 0x00007f358d79143c in QApplicationPrivate::notify_helper () from /usr/lib64/libQtGui.so.4
#21 0x00007f358d799e4a in QApplication::notify () from /usr/lib64/libQtGui.so.4
#22 0x00007f359004e17b in KApplication::notify () from /usr/lib64/libkdeui.so.5
#23 0x00007f358d09f7dc in QCoreApplication::notifyInternal () from /usr/lib64/libQtCore.so.4
#24 0x00007f358d799098 in QApplicationPrivate::sendMouseEvent () from /usr/lib64/libQtGui.so.4
#25 0x00007f358d802df9 in ?? () from /usr/lib64/libQtGui.so.4
#26 0x00007f358d801e65 in QApplication::x11ProcessEvent () from /usr/lib64/libQtGui.so.4
#27 0x00007f358d828fd4 in ?? () from /usr/lib64/libQtGui.so.4
#28 0x00007f3588b487bb in g_main_dispatch () at gmain.c:2144
#29 IA__g_main_context_dispatch (context=0x10a7920) at gmain.c:2697
#30 0x00007f3588b4bf8d in g_main_context_iterate (context=0x10a7920, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2778
#31 0x00007f3588b4c14b in IA__g_main_context_iteration (context=0x10a7920, may_block=1) at gmain.c:2841
#32 0x00007f358d0c907f in QEventDispatcherGlib::processEvents () from /usr/lib64/libQtCore.so.4
#33 0x00007f358d82875f in ?? () from /usr/lib64/libQtGui.so.4
#34 0x00007f358d09e082 in QEventLoop::processEvents () from /usr/lib64/libQtCore.so.4
#35 0x00007f358d09e44d in QEventLoop::exec () from /usr/lib64/libQtCore.so.4
#36 0x00007f358d0a0714 in QCoreApplication::exec () from /usr/lib64/libQtCore.so.4
#37 0x00007f359196f3cb in kdemain (argc=1, argv=0x7fff99dcb5b8) at /usr/src/debug/kdebase-workspace-4.2.3/plasma/shells/desktop/main.cpp:54
#38 0x00007f358c246576 in __libc_start_main (main=0x400830 <main>, argc=1, ubp_av=0x7fff99dcb5b8, init=0x400860 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff99dcb5a8) at libc-start.c:220
#39 0x0000000000400769 in _start ()
Current language:  auto; currently c