Version:            (using KDE 4.2.2)
Compiler:          Using repository packages from Kubuntu Jaunty 
OS:                Linux
Installed from:    Ubuntu Packages

I'm using a fairly unmodified Plasma from Kubuntu Jaunty - I have 4 desktop widgets active:

* 2 of these are "Directory" views
* Sticky Notes
* Simple Calculator

On my taskbar (which I understand is related to plasma?):
* network-management
* Battery status
* System Tray
* K menu
* Clock
* Task list

Not sure whether it makes a difference but I'm also using Compiz Fusion 0.8.2 (also repository install from Kubuntu Jaunty)

I have no idea what activity caused the crash - I was just working in monodevelop at the time, and I've been using MD in KDE 4.2.2 without issue for a few weeks now.  I wasn't actually interacting with the plasma desktop when it exploded and I wasn't doing anything unusual at the time (if anything, I usually have more windows open than I did then).  IE: I strongly doubt I could reproduce the crash even if I wanted to.

Backtrace follows
-----------------

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 3528)]

Thread 2 (Thread 0xa8593b90 (LWP 3533)):
#0  0xb802d430 in __kernel_vsyscall ()
#1  0xb516f0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb637e2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb656a9b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa8792b9a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb656996e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb516b4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb636f49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb3d55730 (LWP 3528)):
[KCrash Handler]
#6  0xb6674951 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#7  0xa894c0d3 in TaskManager::AbstractGroupingStrategy::groupRemoved () from /usr/lib/libtaskmanager.so.4
#8  0xa894d7d1 in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#9  0xa8954597 in ?? () from /usr/lib/libtaskmanager.so.4
#10 0xa895523b in ?? () from /usr/lib/libtaskmanager.so.4
#11 0xb6673ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0xb6674932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0xa8966a63 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#14 0xa89670b0 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#15 0xa894ff10 in TaskManager::GroupManager::remove () from /usr/lib/libtaskmanager.so.4
#16 0xa8951c47 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#17 0xb6673ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb6674932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xa896a483 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#20 0xa896bbaf in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#21 0xa896da14 in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#22 0xb6673ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb6674932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb78ac473 in KWindowSystem::windowRemoved () from /usr/lib/libkdeui.so.5
#25 0xb78aecf6 in ?? () from /usr/lib/libkdeui.so.5
#26 0xb78be1d3 in NETRootInfo::update () from /usr/lib/libkdeui.so.5
#27 0xb78be5bf in NETRootInfo::event () from /usr/lib/libkdeui.so.5
#28 0xb78aef8d in ?? () from /usr/lib/libkdeui.so.5
#29 0xb7761c69 in KApplication::x11EventFilter () from /usr/lib/libkdeui.so.5
#30 0xb7feb4d7 in ?? () from /usr/lib/libkdeinit4_plasma.so
#31 0xb696df3e in ?? () from /usr/lib/libQtGui.so.4
#32 0xb69806a8 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0xb69acc6a in ?? () from /usr/lib/libQtGui.so.4
#34 0xb4f69b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb4f6d0eb in ?? () from /usr/lib/libglib-2.0.so.0
#36 0xb4f6d268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0xb6689438 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0xb69ac365 in ?? () from /usr/lib/libQtGui.so.4
#39 0xb665c06a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb665c4aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0xb665e959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0xb690ad17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#43 0xb7fd8b56 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#44 0x08048712 in _start ()