Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.1
Operating System: Linux 2.6.30-9-generic x86_64
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
While testing Playback options via Amarok 2 (which presents the System Settings -> Sound and Video Configuraton -> Device Preference -> Music setting), selecting PulseAudio (second preference after built-in ATI IXP AC97 audio) and selecting test caused the settings window to hang and forcing it to quit crashed Plasma.

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 3822)]

Thread 2 (Thread 0x7f60c027c950 (LWP 3827)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f60e11634bb in QWaitCondition::wait (this=<value optimized out>, mutex=0x17f7a98, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f60dd57b2fc in QHostInfoAgent::run (this=0x17f7a80) at kernel/qhostinfo.cpp:260
#3  0x00007f60e1162411 in QThreadPrivate::start (arg=0x17f7a80) at thread/qthread_unix.cpp:189
#4  0x00007f60ddebf3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f60deaa61bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f60e1726760 (LWP 3822)):
[KCrash Handler]
#5  TaskManager::GroupManager::manualSortingRequest (this=0xf, taskItem=0x2121a10, newIndex=0) at ../../../libs/taskmanager/groupmanager.cpp:346
#6  0x00007f60c519104c in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x2139330, group=0x20c8ce0) at ../../../libs/taskmanager/abstractgroupingstrategy.cpp:140
#7  0x00007f60c5197f8b in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x2139330) at ../../../libs/taskmanager/strategies/programgroupingstrategy.cpp:193
#8  0x00007f60c5198b25 in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x2139330, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=<value optimized out>)
    at ./programgroupingstrategy.moc:68
#9  0x00007f60e125d74c in QMetaObject::activate (sender=0x20c8ce0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3120
#10 0x00007f60c51a9682 in TaskManager::TaskGroup::itemRemoved (this=0xf, _t1=0x1d43390) at ./taskgroup.moc:143
#11 0x00007f60c5193c80 in TaskManager::GroupManagerPrivate::removeTask (this=0x115be00, task=<value optimized out>) at ../../../libs/taskmanager/groupmanager.cpp:296
#12 0x00007f60c5195c8a in TaskManager::GroupManager::qt_metacall (this=0x115da50, _c=<value optimized out>, _id=<value optimized out>, _a=0x7fffb1b72d00) at ./groupmanager.moc:103
#13 0x00007f60e125d74c in QMetaObject::activate (sender=0x1423b20, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3120
#14 0x00007f60c51ac8a5 in TaskManager::TaskManager::taskRemoved (this=0xf, _t1=<value optimized out>) at ./taskmanager.moc:159
#15 0x00007f60c51ae328 in TaskManager::TaskManager::windowRemoved (this=0x1423b20, w=48234521) at ../../../libs/taskmanager/taskmanager.cpp:279
#16 0x00007f60c51afc77 in TaskManager::TaskManager::qt_metacall (this=0x1423b20, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffb1b72f30) at ./taskmanager.moc:108
#17 0x00007f60e125d74c in QMetaObject::activate (sender=0x1096760, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3120
#18 0x00007f60dff69bc2 in KWindowSystem::windowRemoved (this=0xf, _t1=48234521) at ./kwindowsystem.moc:127
#19 0x00007f60dff6c9ba in KWindowSystemPrivate::removeClient (this=0x10969f0, w=48234521) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#20 0x00007f60dff7acdd in NETRootInfo::update (this=0x1096a18, dirty_props=<value optimized out>) at ../../kdeui/windowmanagement/netwm.cpp:2130
#21 0x00007f60dff7b043 in NETRootInfo::event (this=0x1096a18, event=<value optimized out>, properties=0x7fffb1b73220, properties_size=5) at ../../kdeui/windowmanagement/netwm.cpp:2053
#22 0x00007f60dff6cc6c in KWindowSystemPrivate::x11Event (this=0x10969f0, ev=0x7fffb1b74bf0) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#23 0x00007f60dfe3d0a6 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fffb1b74bf0) at ../../kdeui/kernel/kapplication.cpp:911
#24 0x00007f60d64505e7 in PlasmaApp::x11EventFilter (this=0xcf4a10, event=0x7fffb1b74bf0) at ../../../../plasma/shells/desktop/plasmaapp.cpp:444
#25 0x00007f60df23a5c1 in qt_x11EventFilter (ev=0x7fffb1b74bf0) at kernel/qapplication_x11.cpp:375
#26 0x00007f60df24abf1 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffb1b74bf0) at kernel/qapplication_x11.cpp:3287
#27 0x00007f60df274dac in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007f60de10f8fe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0x00007f60de112fd8 in ?? () from /usr/lib/libglib-2.0.so.0
#30 0x00007f60de113100 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#31 0x00007f60e1270b66 in QEventDispatcherGlib::processEvents (this=0xcfddd0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#32 0x00007f60df27455e in QGuiEventDispatcherGlib::processEvents (this=0xf, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f60e1246b12 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#34 0x00007f60e1246ee4 in QEventLoop::exec (this=0x7fffb1b74f20, flags=) at kernel/qeventloop.cpp:200
#35 0x00007f60e1248f89 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x00007f60d643d88f in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../../../plasma/shells/desktop/main.cpp:50
#37 0x0000000000406cd4 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x40a1e0 "0") at ../../kinit/kinit.cpp:671
#38 0x0000000000407980 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1163
#39 0x0000000000407f1f in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1356
#40 0x0000000000408ad2 in main (argc=2, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1783

Reported using DrKonqi