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:
Plasma-desktop crushes when closing random windows.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3463)]

Thread 3 (Thread 0x7f86b4659950 (LWP 3464)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f86d4f6bce9 in QWaitCondition::wait (this=0x2a4e3e0, mutex=0x2a4e3d8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f86d3df75dc in QHostInfoAgent::run (this=0x2a4e3c0) at kernel/qhostinfo.cpp:260
#3  0x00007f86d4f6ad02 in QThreadPrivate::start (arg=0x2a4e3c0) at thread/qthread_unix.cpp:189
#4  0x00007f86d0e3b3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f86d1a1ffcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f86adbde950 (LWP 3465)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007f86d4f6a745 in thread_sleep (ti=0x7f86adbddfb0) at thread/qthread_unix.cpp:298
#2  0x00007f86d4f6a8ae in QThread::msleep (msecs=50) at thread/qthread_unix.cpp:324
#3  0x00007f86b54ee10e in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#4  0x00007f86d4f6ad02 in QThreadPrivate::start (arg=0x2c0b870) at thread/qthread_unix.cpp:189
#5  0x00007f86d0e3b3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#6  0x00007f86d1a1ffcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f86d5533750 (LWP 3463)):
[KCrash Handler]
#5  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x28f4c50, newIndex=4) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#6  0x00007f86b7a83b3a in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x371efd0, group=0x2c39f30)
    at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#7  0x00007f86b7a8ada8 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x371efd0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#8  0x00007f86b7a8bc2d in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x371efd0, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#9  0x00007f86d50698d2 in QMetaObject::activate (sender=0x2c39f30, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3120
#10 0x00007f86b7a9ca92 in TaskManager::TaskGroup::itemRemoved (this=0x0, _t1=0x373b610) at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:146
#11 0x00007f86b7a9d3b1 in TaskManager::TaskGroup::remove (this=0x2c39f30, item=0x373b610) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#12 0x00007f86b7a85ed1 in TaskManager::GroupManagerPrivate::removeTask (this=0x2497bb0, task={d = 0x7fffdd565d40}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#13 0x00007f86b7a8851d in TaskManager::GroupManager::qt_metacall (this=0x2497b80, _c=<value optimized out>, _id=<value optimized out>, _a=0x7fffdd565e80)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/groupmanager.moc:105
#14 0x00007f86d50698d2 in QMetaObject::activate (sender=0x2497cb0, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x1) at kernel/qobject.cpp:3120
#15 0x00007f86b7a9ff35 in TaskManager::TaskManager::taskRemoved (this=0x0, _t1=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:162
#16 0x00007f86b7aa156e in TaskManager::TaskManager::windowRemoved (this=0x2497cb0, w=16777379) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#17 0x00007f86b7aa32bf in TaskManager::TaskManager::qt_metacall (this=0x2497cb0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffdd5660a0)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:110
#18 0x00007f86d50698d2 in QMetaObject::activate (sender=0x2354ac0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x1) at kernel/qobject.cpp:3120
#19 0x00007f86d3860ab2 in KWindowSystem::windowRemoved (this=0x0, _t1=16777379) at /build/buildd/kde4libs-4.2.95/obj-x86_64-linux-gnu/kdeui/kwindowsystem.moc:127
#20 0x00007f86d3862ffb in KWindowSystemPrivate::removeClient (this=0x22b7e80, w=16777379) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#21 0x00007f86d3871fe1 in NETRootInfo::update (this=0x22b7ea8, dirty_props=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#22 0x00007f86d387236b in NETRootInfo::event (this=0x22b7ea8, event=<value optimized out>, properties=0x7fffdd566390, properties_size=5)
    at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#23 0x00007f86d38632cb in KWindowSystemPrivate::x11Event (this=0x22b7e80, ev=0x7fffdd567dc0) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#24 0x00007f86d3732a43 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fffdd567dc0) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#25 0x00007f86c8f92b57 in PlasmaApp::x11EventFilter (this=0x1f8d800, event=0x7fffdd567dc0) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#26 0x00007f86d2652fdf in qt_x11EventFilter (ev=0x7fffdd567dc0) at kernel/qapplication_x11.cpp:375
#27 0x00007f86d26664e4 in QApplication::x11ProcessEvent (this=0x1f8d800, event=0x7fffdd567dc0) at kernel/qapplication_x11.cpp:3287
#28 0x00007f86d268ff84 in x11EventSourceDispatch (s=0x1fd03e0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007f86d108a20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007f86d108d8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007f86d108da7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007f86d507d52f in QEventDispatcherGlib::processEvents (this=0x1fcc8b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#33 0x00007f86d268f70f in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f86d50526a2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -581533520}) at kernel/qeventloop.cpp:149
#35 0x00007f86d5052a6d in QEventLoop::exec (this=0x7fffdd5680f0, flags={i = -581533440}) at kernel/qeventloop.cpp:200
#36 0x00007f86d5054d34 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0x00007f86c8f7f63b in kdemain (argc=1, argv=0x1f7d940) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#38 0x000000000040714e in launch (argc=1, _name=0x1f98398 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x1f983b8 "", 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=0x7fffdd568f88, envp=0x7fffdd568fa0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi