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: 4.5.0
Operating System: Linux 2.6.28-13-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I have just updated to 4.3 RC1 and when i was logging in i had this crash as a welcome :P

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4695)]

Thread 2 (Thread 0xa82a2b90 (LWP 4700)):
#0  0xb805d430 in __kernel_vsyscall ()
#1  0xb65190e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb66f92ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e4c9b2 in QWaitCondition::wait (this=0x8e19e58, mutex=0x8e19e54, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb7788152 in QHostInfoAgent::run (this=0x8e19e48) at kernel/qhostinfo.cpp:260
#5  0xb7e4b96e in QThreadPrivate::start (arg=0x8e19e48) at thread/qthread_unix.cpp:189
#6  0xb65154ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb66ea49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb6023a10 (LWP 4695)):
[KCrash Handler]
#6  0xa850b73a in TaskManager::TaskGroup::remove (this=0x93e0378, item=0x947a880) at /usr/include/qt4/QtCore/qlist.h:90
#7  0xa84f1ba5 in TaskManager::GroupManagerPrivate::removeTask (this=0x8cb2068, task={d = 0xbfd7a3cc}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#8  0xa84f446a in TaskManager::GroupManager::qt_metacall (this=0x8a62ed0, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfd7a4ac)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:105
#9  0xb7f55ca8 in QMetaObject::activate (sender=0x8cffa88, from_signal_index=5, to_signal_index=5, argv=0xbfd7a4ac) at kernel/qobject.cpp:3069
#10 0xb7f56932 in QMetaObject::activate (sender=0x8cffa88, m=0xa8519d3c, local_signal_index=1, argv=0xbfd7a4ac) at kernel/qobject.cpp:3143
#11 0xa850e823 in TaskManager::TaskManager::taskRemoved (this=0x8cffa88, _t1={d = 0xbfd7a4f4}) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:162
#12 0xa85100cf in TaskManager::TaskManager::windowRemoved (this=0x8cffa88, w=50331675) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#13 0xa8511fec in TaskManager::TaskManager::qt_metacall (this=0x8cffa88, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfd7a61c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:110
#14 0xb7f55ca8 in QMetaObject::activate (sender=0x86f3550, from_signal_index=6, to_signal_index=6, argv=0xbfd7a61c) at kernel/qobject.cpp:3069
#15 0xb7f56932 in QMetaObject::activate (sender=0x86f3550, m=0xb76be26c, local_signal_index=2, argv=0xbfd7a61c) at kernel/qobject.cpp:3143
#16 0xb7656853 in KWindowSystem::windowRemoved (this=0x86f3550, _t1=50331675) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#17 0xb76590d6 in KWindowSystemPrivate::removeClient (this=0x86bf668, w=50331675) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#18 0xb7668753 in NETRootInfo::update (this=0x86bf67c, dirty_props=0xbfd7a764) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#19 0xb7668b3f in NETRootInfo::event (this=0x86bf67c, event=0xbfd7ae7c, properties=0xbfd7a848, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#20 0xb765936d in KWindowSystemPrivate::x11Event (this=0x86bf668, ev=0xbfd7ae1c) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#21 0xb75096f9 in KApplication::x11EventFilter (this=0x85cb958, _event=0xbfd7ae1c) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#22 0xb3b1ae37 in PlasmaApp::x11EventFilter (this=0x85cb958, event=0xbfd7ae1c) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#23 0xb6a32f3e in qt_x11EventFilter (ev=0xbfd7ae1c) at kernel/qapplication_x11.cpp:375
#24 0xb6a456a8 in QApplication::x11ProcessEvent (this=0x85cb958, event=0xbfd7ae1c) at kernel/qapplication_x11.cpp:3273
#25 0xb6a71c6a in x11EventSourceDispatch (s=0x860c8b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#26 0xb6562b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#27 0xb65660eb in ?? () from /usr/lib/libglib-2.0.so.0
#28 0xb6566268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#29 0xb7f6b438 in QEventDispatcherGlib::processEvents (this=0x86072f0, flags={i = -1076383784}) at kernel/qeventdispatcher_glib.cpp:323
#30 0xb6a71365 in QGuiEventDispatcherGlib::processEvents (this=0x86072f0, flags={i = -1076383736}) at kernel/qguieventdispatcher_glib.cpp:202
#31 0xb7f3e06a in QEventLoop::processEvents (this=0xbfd7b080, flags={i = -1076383672}) at kernel/qeventloop.cpp:149
#32 0xb7f3e4aa in QEventLoop::exec (this=0xbfd7b080, flags={i = -1076383608}) at kernel/qeventloop.cpp:200
#33 0xb7f40959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#34 0xb69cfd17 in QApplication::exec () at kernel/qapplication.cpp:3553
#35 0xb3b05510 in kdemain (argc=1, argv=0x8580b40) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#36 0x0804e1c0 in launch (argc=1, _name=0x85e689c "/usr/bin/plasma-desktop", args=0x85e68b4 "", cwd=0x0, envc=0, envs=0x85e68b8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80512d1 "0") at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:672
#37 0x0804e99d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1164
#38 0x0804ef25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1357
#39 0x0804fb0a in main (argc=2, argv=0xbfd7b874, envp=0xbfd7b880) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi