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: 4.5.2
Operating System: Linux 2.6.31-2-generic x86_64
Distribution: Ubuntu karmic (development branch)

What I was doing when the application crashed:
plasma crashes while using krdc, surely the one has nothing to do with the other

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f62a885b760 (LWP 4067))]

Thread 2 (Thread 0x7f6289341950 (LWP 4068)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f62a829c49b in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x14a5a48, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x14a5a48, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f62a46d871c in QHostInfoAgent::run (this=0x14a5a30) at kernel/qhostinfo.cpp:260
#4  0x00007f62a829b3e5 in QThreadPrivate::start (arg=0x14a5a30) at thread/qthread_unix.cpp:188
#5  0x00007f62a501c3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#6  0x00007f62a5c031bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f62a885b760 (LWP 4067)):
[KCrash Handler]
#5  0x00007f628bbbe296 in TaskManager::GroupManager::manualSortingRequest(TaskManager::AbstractGroupableItem*, int) () from /usr/lib/libtaskmanager.so.4
#6  0x00007f628bbbc697 in TaskManager::AbstractGroupingStrategy::closeGroup(TaskManager::TaskGroup*) () from /usr/lib/libtaskmanager.so.4
#7  0x00007f628bbc35db in ?? () from /usr/lib/libtaskmanager.so.4
#8  0x00007f628bbc4215 in ?? () from /usr/lib/libtaskmanager.so.4
#9  0x00007f62a8396e1c in QMetaObject::activate (sender=0x1604730, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#10 0x00007f628bbd4ed2 in TaskManager::TaskGroup::itemRemoved(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#11 0x00007f628bbd55b1 in TaskManager::TaskGroup::remove(TaskManager::AbstractGroupableItem*) () from /usr/lib/libtaskmanager.so.4
#12 0x00007f628bbbecc8 in ?? () from /usr/lib/libtaskmanager.so.4
#13 0x00007f628bbc10ca in TaskManager::GroupManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#14 0x00007f62a8396e1c in QMetaObject::activate (sender=0x12b05f0, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#15 0x00007f628bbd8345 in TaskManager::TaskManager::taskRemoved(KSharedPtr<TaskManager::Task>) () from /usr/lib/libtaskmanager.so.4
#16 0x00007f628bbd9f0d in TaskManager::TaskManager::windowRemoved(unsigned long) () from /usr/lib/libtaskmanager.so.4
#17 0x00007f628bbdb6a7 in TaskManager::TaskManager::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libtaskmanager.so.4
#18 0x00007f62a8396e1c in QMetaObject::activate (sender=0xd75c70, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0x1) at kernel/qobject.cpp:3113
#19 0x00007f62a709fb32 in KWindowSystem::windowRemoved (this=0x0, _t1=16777241) at ./kwindowsystem.moc:127
#20 0x00007f62a70a292a in KWindowSystemPrivate::removeClient (this=0xc73b30, w=16777241) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#21 0x00007f62a70b0d4d in NETRootInfo::update (this=0xc73b58, dirty_props=<value optimized out>) at ../../kdeui/windowmanagement/netwm.cpp:2135
#22 0x00007f62a70b10b3 in NETRootInfo::event (this=0xc73b58, event=<value optimized out>, properties=0x7fff084bde60, properties_size=5) at ../../kdeui/windowmanagement/netwm.cpp:2058
#23 0x00007f62a70a2bdc in KWindowSystemPrivate::x11Event (this=0xc73b30, ev=0x7fff084bf830) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#24 0x00007f62a6f72846 in KAppX11HackWidget::publicx11Event (this=<value optimized out>, _event=0x7fff084bf830) at ../../kdeui/kernel/kapplication.cpp:911
#25 KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fff084bf830) at ../../kdeui/kernel/kapplication.cpp:961
#26 0x00007f629d6aaa57 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#27 0x00007f62a6397a31 in qt_x11EventFilter (ev=0x7fff084bf830) at kernel/qapplication_x11.cpp:375
#28 0x00007f62a63a8094 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff084bf830) at kernel/qapplication_x11.cpp:3271
#29 0x00007f62a63d231c in x11EventSourceDispatch (s=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#30 0x00007f62a526c9fe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007f62a52703c8 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x00007f62a52704f0 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007f62a83aa1f6 in QEventDispatcherGlib::processEvents (this=0x9a7a40, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#34 0x00007f62a63d1ace in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#35 0x00007f62a8380572 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#36 0x00007f62a8380944 in QEventLoop::exec (this=0x7fff084bfb60, flags=) at kernel/qeventloop.cpp:201
#37 0x00007f62a8382af9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#38 0x00007f629d6976af in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#39 0x0000000000406d23 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=0x40a221 "0") at ../../kinit/kinit.cpp:672
#40 0x00000000004079d0 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1164
#41 0x0000000000407f6f in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1357
#42 0x0000000000408b22 in main (argc=2, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1784

This bug may be a duplicate of or related to bug 199299

Reported using DrKonqi