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: 4.5.1
Operating System: Linux 2.6.28-13-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
When I close more than one Konqueror windows Plasma workspace crashes.

Kubuntu Jaunty Jackalope (9.04) + KDE 4.3RC1.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f8bac785766 in TaskManager::GroupManager::manualSortingRequest () from /usr/lib/libtaskmanager.so.4
#6  0x00007f8bac783b3a in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#7  0x00007f8bac78ada8 in ?? () from /usr/lib/libtaskmanager.so.4
#8  0x00007f8bac78bc2d in ?? () from /usr/lib/libtaskmanager.so.4
#9  0x00007f8bc9dc88d2 in QMetaObject::activate (sender=0x3179a10, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3120
#10 0x00007f8bac79ca92 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#11 0x00007f8bac79d3b1 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#12 0x00007f8bac785ed1 in ?? () from /usr/lib/libtaskmanager.so.4
#13 0x00007f8bac78851d in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#14 0x00007f8bc9dc88d2 in QMetaObject::activate (sender=0x1f2a300, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x1) at kernel/qobject.cpp:3120
#15 0x00007f8bac79ff35 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#16 0x00007f8bac7a156e in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#17 0x00007f8bac7a32bf in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#18 0x00007f8bc9dc88d2 in QMetaObject::activate (sender=0x1e810c0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x1) at kernel/qobject.cpp:3120
#19 0x00007f8bc85bfab2 in KWindowSystem::windowRemoved (this=0x0, _t1=49404197) at /build/buildd/kde4libs-4.2.95/obj-x86_64-linux-gnu/kdeui/kwindowsystem.moc:127
#20 0x00007f8bc85c1ffb in KWindowSystemPrivate::removeClient (this=0x1e81350, w=49404197) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#21 0x00007f8bc85d0fe1 in NETRootInfo::update (this=0x1e81378, dirty_props=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#22 0x00007f8bc85d136b in NETRootInfo::event (this=0x1e81378, event=<value optimized out>, properties=0x7fffd22c3140, properties_size=5)
    at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#23 0x00007f8bc85c22cb in KWindowSystemPrivate::x11Event (this=0x1e81350, ev=0x7fffd22c4b70) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#24 0x00007f8bc8491a43 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fffd22c4b70) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#25 0x00007f8bbdcf1b57 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#26 0x00007f8bc73b1fdf in qt_x11EventFilter (ev=0x7fffd22c4b70) at kernel/qapplication_x11.cpp:375
#27 0x00007f8bc73c54e4 in QApplication::x11ProcessEvent (this=0x1a97ea0, event=0x7fffd22c4b70) at kernel/qapplication_x11.cpp:3287
#28 0x00007f8bc73eef84 in x11EventSourceDispatch (s=0x1adaa20, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007f8bc5de920a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007f8bc5dec8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007f8bc5deca7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007f8bc9ddc52f in QEventDispatcherGlib::processEvents (this=0x1ad6f00, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#33 0x00007f8bc73ee70f in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f8bc9db16a2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -768848288}) at kernel/qeventloop.cpp:149
#35 0x00007f8bc9db1a6d in QEventLoop::exec (this=0x7fffd22c4ea0, flags={i = -768848208}) at kernel/qeventloop.cpp:200
#36 0x00007f8bc9db3d34 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x00007f8bbdcde63b in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#38 0x000000000040714e in launch (argc=1, _name=0x1a8a968 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x1a8a988 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a309 "0") at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:672
#39 0x0000000000407978 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1164
#40 0x0000000000407f25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1357
#41 0x0000000000408a66 in main (argc=2, argv=0x7fffd22c5d38, envp=0x7fffd22c5d50) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi