Version:           KDE 4.0.85 (using Devel)
Installed from:    Compiled sources
Compiler:          gcc (GCC) 4.3.1 
OS:                Linux

Plasma crash while adding plasma applets to the desktop seemingly arbitrarily, and when the applets aren't neccesarily working correctly.  (ie, dragging them to the desktop only produces a small round black button type thing.)

To reproduce on my system, I just need to drag alot of plasma applets to the desktop and eventually it will crash, but I am aware that this might just be specific to my system, however I'm attaching the backtrace anyway...someone might have the same system heh.

BEGIN

Application: Plasma Workspace (plasma), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0xb49926f0 (LWP 7425)]
[New Thread 0xb2445b90 (LWP 7521)]
[New Thread 0xb07b5b90 (LWP 7454)]
[New Thread 0xb0fb6b90 (LWP 7447)]
[New Thread 0xb2e5eb90 (LWP 7445)]
[KCrash handler]
#6  0xb75d3889 in KConfigGroup::config () from /opt/kdemod/lib/libkdecore.so.5
#7  0xb7eaa6f2 in Plasma::Applet::saveState ()
   from /opt/kdemod/lib/libplasma.so.2
#8  0xb7ecddef in Plasma::Containment::addApplet ()
   from /opt/kdemod/lib/libplasma.so.2
#9  0xb7ece060 in Plasma::ContainmentPrivate::addApplet ()
   from /opt/kdemod/lib/libplasma.so.2
#10 0xb7ece12f in Plasma::Containment::addApplet ()
   from /opt/kdemod/lib/libplasma.so.2
#11 0xb7ecf3d5 in Plasma::Containment::dropEvent ()
   from /opt/kdemod/lib/libplasma.so.2
#12 0xb6484221 in QGraphicsItem::sceneEvent () from /usr/lib/libQtGui.so.4
#13 0xb64c2655 in QGraphicsWidget::sceneEvent () from /usr/lib/libQtGui.so.4
#14 0xb64a0040 in ?? () from /usr/lib/libQtGui.so.4
#15 0xb64a187d in ?? () from /usr/lib/libQtGui.so.4
#16 0xb64a18b0 in QGraphicsScene::dropEvent () from /usr/lib/libQtGui.so.4
#17 0xb64a89b1 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#18 0xb5f5a8b3 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#19 0xb5f61fa2 in QApplication::notify () from /usr/lib/libQtGui.so.4
#20 0xb7a13774 in KApplication::notify () from /opt/kdemod/lib/libkdeui.so.5
#21 0xb6b238dc in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#22 0xb64b49f8 in QGraphicsView::dropEvent () from /usr/lib/libQtGui.so.4
#23 0xb5fac4b2 in QWidget::event () from /usr/lib/libQtGui.so.4
#24 0xb62b26bc in QFrame::event () from /usr/lib/libQtGui.so.4
#25 0xb634011e in QAbstractScrollArea::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#26 0xb64b676d in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#27 0xb6342492 in ?? () from /usr/lib/libQtGui.so.4
#28 0xb6b22beb in QCoreApplicationPrivate::sendThroughObjectEventFilters ()
   from /usr/lib/libQtCore.so.4
#29 0xb5f5a896 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#30 0xb5f62680 in QApplication::notify () from /usr/lib/libQtGui.so.4
#31 0xb7a13774 in KApplication::notify () from /opt/kdemod/lib/libkdeui.so.5
#32 0xb6b238dc in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#33 0xb5fd0b92 in ?? () from /usr/lib/libQtGui.so.4
#34 0xb5fd54b7 in QDragManager::drop () from /usr/lib/libQtGui.so.4
#35 0xb5fd564c in QDragManager::eventFilter () from /usr/lib/libQtGui.so.4
#36 0xb6b22c88 in QCoreApplicationPrivate::sendThroughApplicationEventFilters
    () from /usr/lib/libQtCore.so.4
#37 0xb5f5a83a in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#38 0xb5f62929 in QApplication::notify () from /usr/lib/libQtGui.so.4
#39 0xb7a13774 in KApplication::notify () from /opt/kdemod/lib/libkdeui.so.5
#40 0xb6b238dc in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#41 0xb5f61c06 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#42 0xb5fc4e13 in ?? () from /usr/lib/libQtGui.so.4
#43 0xb5fc3cc3 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#44 0xb5fea1a8 in ?? () from /usr/lib/libQtGui.so.4
#45 0xb57f3f88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#46 0xb57f74eb in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#47 0xb57f7668 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#48 0xb6b4b69d in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#49 0xb5fe992e in ?? () from /usr/lib/libQtGui.so.4
#50 0xb6b221cf in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#51 0xb6b22390 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#52 0xb5fd379c in QDragManager::drag () from /usr/lib/libQtGui.so.4
#53 0xb5f6c935 in QDrag::start () from /usr/lib/libQtGui.so.4
#54 0xb7eb3b9a in CustomDragTreeView::startDrag ()
   from /opt/kdemod/lib/libplasma.so.2
#55 0xb63de599 in QAbstractItemView::mouseMoveEvent ()
   from /usr/lib/libQtGui.so.4
#56 0xb6416d10 in QTreeView::mouseMoveEvent () from /usr/lib/libQtGui.so.4
#57 0xb5fac9db in QWidget::event () from /usr/lib/libQtGui.so.4
#58 0xb62b26bc in QFrame::event () from /usr/lib/libQtGui.so.4
#59 0xb634011e in QAbstractScrollArea::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#60 0xb63e2285 in QAbstractItemView::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#61 0xb6416f9b in QTreeView::viewportEvent () from /usr/lib/libQtGui.so.4
#62 0xb6342492 in ?? () from /usr/lib/libQtGui.so.4
#63 0xb6b22beb in QCoreApplicationPrivate::sendThroughObjectEventFilters ()
   from /usr/lib/libQtCore.so.4
#64 0xb5f5a896 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#65 0xb5f62929 in QApplication::notify () from /usr/lib/libQtGui.so.4
#66 0xb7a13774 in KApplication::notify () from /opt/kdemod/lib/libkdeui.so.5
#67 0xb6b238dc in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#68 0xb5f61c06 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#69 0xb5fc4e13 in ?? () from /usr/lib/libQtGui.so.4
#70 0xb5fc3cc3 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#71 0xb5fea1a8 in ?? () from /usr/lib/libQtGui.so.4
#72 0xb57f3f88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#73 0xb57f74eb in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#74 0xb57f7668 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#75 0xb6b4b69d in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#76 0xb5fe992e in ?? () from /usr/lib/libQtGui.so.4
#77 0xb6b221cf in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#78 0xb6b22390 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#79 0xb6b2472d in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#80 0xb5f5a764 in QApplication::exec () from /usr/lib/libQtGui.so.4
#81 0xb7fb3a6e in kdemain () from /opt/kdemod/lib/libkdeinit4_plasma.so
#82 0x080487f6 in main ()
#0  0xb7fc8424 in __kernel_vsyscall ()

END

Here is a more detailed description of my system:

Archlinux.  (Latest since 2008-07-05)
KDEmod 4.  (AFAIK there are no actual modifications to the KDE source, just extra wallpapers and for 3.x series a more modular split package system for Archlinux. )

Linux psteynpc 2.6.25-ARCH #1 SMP PREEMPT Sat Jun 14 18:07:19 CEST 2008 i686 Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz GenuineIntel GNU/Linux

2gb ram

nvidia-173.14.09-4 drivers and 8600GT card.

Hope this is enough, and more importantly - I hope I'm not wasting anyone's time by reporting this which may just be specific to KDEMOD (although as I said afaik it uses the original sources.)

Hopefuly you'll be able to see from the backtrace if it's a real problem or just localised to me...

Cheers!
Pieter Steyn