Version:            (using KDE 4.2.1)
OS:                Linux
Installed from:    Ubuntu Packages

I had Kickoff application launcher placed on the panel. It seemed to be broken somehow (when I clicked on it, it showed only menu only as a black rectangle, not rendering anything more), so I right clicked on it to remove it and add it once more. When right clicking, it crashed with following backtrace:

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 16920)]

Thread 4 (Thread 0xa9c88b90 (LWP 16925)):
#0  0xb80f7430 in __kernel_vsyscall ()
#1  0xb6557df1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb6826150 in ?? () from /usr/lib/libQtCore.so.4
#3  0xb67566ae in ?? () from /usr/lib/libQtCore.so.4
#4  0xb59a050f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb655fa0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread 0xa9487b90 (LWP 16927)):
#0  0xb80f7430 in __kernel_vsyscall ()
#1  0xb59a4075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb656dbbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb67576f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7ab1532 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb67566ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb59a050f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb655fa0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa8789b90 (LWP 16936)):
#0  0xb80f7430 in __kernel_vsyscall ()
#1  0xb59a4075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb656dbbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb67576f2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9e54c8a in RenderThread::run (this=0x96aa9ec) at /build/buildd/kdebase-workspace-4.2.1a/plasma/wallpapers/image/renderthread.cpp:91
#5  0xb67566ae in ?? () from /usr/lib/libQtCore.so.4
#6  0xb59a050f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb655fa0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb551d6c0 (LWP 16920)):
[KCrash Handler]
#6  0xb6b84661 in QImage::scanLine () from /usr/lib/libQtGui.so.4
#7  0xb6b61640 in QWidgetPrivate::setWindowIcon_sys () from /usr/lib/libQtGui.so.4
#8  0xb6b2c49b in QWidget::create () from /usr/lib/libQtGui.so.4
#9  0xb6b282f3 in QWidgetPrivate::createWinId () from /usr/lib/libQtGui.so.4
#10 0xb6b2bfa8 in QWidget::createWinId () from /usr/lib/libQtGui.so.4
#11 0xb6eb1052 in QMenu::exec () from /usr/lib/libQtGui.so.4
#12 0xb7f2a35c in ?? () from /usr/lib/libplasma.so.3
#13 0xb7f2a455 in Plasma::Containment::contextMenuEvent () from /usr/lib/libplasma.so.3
#14 0xb705307e in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#15 0xb70967af in QGraphicsWidget::sceneEvent () from /usr/lib/libQtGui.so.4
#16 0xb707154c in ?? () from /usr/lib/libQtGui.so.4
#17 0xb7077907 in QGraphicsScene::contextMenuEvent () from /usr/lib/libQtGui.so.4
#18 0xb707a747 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#19 0xb6ad68ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#20 0xb6ade72e in QApplication::notify () from /usr/lib/libQtGui.so.4
#21 0xb783c10d in KApplication::notify (this=0x9354ce8, receiver=0x93f16c8, event=0xbfbf5e6c) at /build/buildd/kde4libs-4.2.1a/kdeui/kernel/kapplication.cpp:307
#22 0xb6846e61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#23 0xb70874c6 in QGraphicsView::contextMenuEvent () from /usr/lib/libQtGui.so.4
#24 0xb6b2ec6d in QWidget::event () from /usr/lib/libQtGui.so.4
#25 0xb6e65fd3 in QFrame::event () from /usr/lib/libQtGui.so.4
#26 0xb6efc7df in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#27 0xb7089d0f in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#28 0xb6efed85 in ?? () from /usr/lib/libQtGui.so.4
#29 0xb684604a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#30 0xb6ad68ca in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#31 0xb6adec55 in QApplication::notify () from /usr/lib/libQtGui.so.4
#32 0xb783c10d in KApplication::notify (this=0x9354ce8, receiver=0x99154a0, event=0xbfbf6470) at /build/buildd/kde4libs-4.2.1a/kdeui/kernel/kapplication.cpp:307
#33 0xb6846e61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#34 0xb6ae186e in QCoreApplication::sendSpontaneousEvent () from /usr/lib/libQtGui.so.4
#35 0xb6b48e3f in ?? () from /usr/lib/libQtGui.so.4
#36 0xb6b479e5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#37 0xb6b717aa in ?? () from /usr/lib/libQtGui.so.4
#38 0xb57e5718 in IA__g_main_context_dispatch (context=0x936d690) at /build/buildd/glib2.0-2.18.2/glib/gmain.c:2144
#39 0xb57e8dc3 in g_main_context_iterate (context=0x936d690, block=1, dispatch=1, self=0x936b628) at /build/buildd/glib2.0-2.18.2/glib/gmain.c:2778
#40 0xb57e8f81 in IA__g_main_context_iteration (context=0x936d690, may_block=1) at /build/buildd/glib2.0-2.18.2/glib/gmain.c:2841
#41 0xb6871478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#42 0xb6b70ea5 in ?? () from /usr/lib/libQtGui.so.4
#43 0xb684552a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#44 0xb68456ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#45 0xb6847da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#46 0xb6ad6767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#47 0xb80807f6 in kdemain (argc=1, argv=0xbfbf6e44) at /build/buildd/kdebase-workspace-4.2.1a/plasma/shells/desktop/main.cpp:54
#48 0x08048712 in main (argc=) at /build/buildd/kdebase-workspace-4.2.1a/obj-i486-linux-gnu/plasma/shells/desktop/plasma_qgv_dummy.cpp:3