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 2.6.29-02062901-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was browsing kde-look.org and was opening a new window in firefox(3.5 compiled myself) for a screenshot when plasma crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 6225)]

Thread 2 (Thread 0x7f5ea0ba4950 (LWP 6235)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f5ec586d939 in QWaitCondition::wait (this=0x8b55390, mutex=0x8b55388, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f5ec46ea4cc in QHostInfoAgent::run (this=0x8b55370) at kernel/qhostinfo.cpp:260
#3  0x00007f5ec586c952 in QThreadPrivate::start (arg=0x8b55370) at thread/qthread_unix.cpp:189
#4  0x00007f5ec16ee3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f5ec22d2fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f5ec5e25750 (LWP 6225)):
[KCrash Handler]
#5  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x6d14240, newIndex=0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#6  0x00007f5ea8df2b3a in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x2b1ab10, group=0x73aa010)
    at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#7  0x00007f5ea8df9da8 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x2b1ab10) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#8  0x00007f5ea8dfac2d in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x2b1ab10, _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  0x00007f5ec596b1f2 in QMetaObject::activate (sender=0x73aa010, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3069
#10 0x00007f5ea8e0ba92 in TaskManager::TaskGroup::itemRemoved (this=0x0, _t1=0x74c1cf0) at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:146
#11 0x00007f5ea8e0c3b1 in TaskManager::TaskGroup::remove (this=0x73aa010, item=0x74c1cf0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#12 0x00007f5ea8df4ed1 in TaskManager::GroupManagerPrivate::removeTask (this=0x13be320, task={d = 0x7fffcde6b620}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#13 0x00007f5ea8df751d in TaskManager::GroupManager::qt_metacall (this=0x135dc80, _c=<value optimized out>, _id=<value optimized out>, _a=0x7fffcde6b760)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/groupmanager.moc:105
#14 0x00007f5ec596b1f2 in QMetaObject::activate (sender=0x13fc150, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x1) at kernel/qobject.cpp:3069
#15 0x00007f5ea8e0ef35 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 0x00007f5ea8e1056e in TaskManager::TaskManager::windowRemoved (this=0x13fc150, w=60825042) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#17 0x00007f5ea8e122bf in TaskManager::TaskManager::qt_metacall (this=0x13fc150, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffcde6b980)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/taskmanager.moc:110
#18 0x00007f5ec596b1f2 in QMetaObject::activate (sender=0xbb8e30, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x1) at kernel/qobject.cpp:3069
#19 0x00007f5ec414fab2 in KWindowSystem::windowRemoved (this=0x0, _t1=60825042) at /build/buildd/kde4libs-4.2.95/obj-x86_64-linux-gnu/kdeui/kwindowsystem.moc:127
#20 0x00007f5ec4151ffb in KWindowSystemPrivate::removeClient (this=0xbb90c0, w=60825042) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#21 0x00007f5ec4160fe1 in NETRootInfo::update (this=0xbb90e8, dirty_props=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#22 0x00007f5ec416136b in NETRootInfo::event (this=0xbb90e8, event=<value optimized out>, properties=0x7fffcde6bc70, properties_size=5)
    at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#23 0x00007f5ec41522cb in KWindowSystemPrivate::x11Event (this=0xbb90c0, ev=0x7fffcde6c660) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#24 0x00007f5ec4021a43 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fffcde6c660) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#25 0x00007f5eb966bb57 in PlasmaApp::x11EventFilter (this=0x7a3cb0, event=0x7fffcde6c660) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#26 0x00007f5ec2f3bb1f in qt_x11EventFilter (ev=0x7fffcde6c660) at kernel/qapplication_x11.cpp:375
#27 0x00007f5ec2f4efaf in QApplication::x11ProcessEvent (this=0x7a3cb0, event=0x7fffcde6c660) at kernel/qapplication_x11.cpp:3273
#28 0x00007f5ec2f78464 in x11EventSourceDispatch (s=0x7e8de0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007f5ec193d20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007f5ec19408e0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007f5ec1940a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007f5ec597ee6f in QEventDispatcherGlib::processEvents (this=0x7e4370, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#33 0x00007f5ec2f77bef in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f5ec5954002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -840513200}) at kernel/qeventloop.cpp:149
#35 0x00007f5ec59543cd in QEventLoop::exec (this=0x7fffcde6c990, flags={i = -840513120}) at kernel/qeventloop.cpp:200
#36 0x00007f5ec5956694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#37 0x00007f5eb965863b in kdemain (argc=1, argv=0x789250) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#38 0x000000000040714e in launch (argc=1, _name=0x7b0d68 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x7b0d88 "", 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=0x7fffcde6d828, envp=0x7fffcde6d840) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi