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 x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
It most of the time happens when closing firefox 3.5. But it's quite random

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3865)]

Thread 2 (Thread 0x7f35ed492950 (LWP 3868)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f360d8ec939 in QWaitCondition::wait (this=0x19ab330, mutex=0x19ab328, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f360c7694cc in QHostInfoAgent::run (this=0x19ab310) at kernel/qhostinfo.cpp:260
#3  0x00007f360d8eb952 in QThreadPrivate::start (arg=0x19ab310) at thread/qthread_unix.cpp:189
#4  0x00007f360976d3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f360a351fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f360deb7750 (LWP 3865)):
[KCrash Handler]
#5  0x00007f35f0369766 in TaskManager::GroupManager::manualSortingRequest () from /usr/lib/libtaskmanager.so.4
#6  0x00007f35f0367b3a in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#7  0x00007f35f036eda8 in ?? () from /usr/lib/libtaskmanager.so.4
#8  0x00007f35f036fc2d in ?? () from /usr/lib/libtaskmanager.so.4
#9  0x00007f360d9ea1f2 in QMetaObject::activate (sender=0x25af820, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3069
#10 0x00007f35f0380a92 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#11 0x00007f35f03813b1 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#12 0x00007f35f0369ed1 in ?? () from /usr/lib/libtaskmanager.so.4
#13 0x00007f35f036c51d in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#14 0x00007f360d9ea1f2 in QMetaObject::activate (sender=0x1581560, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x1) at kernel/qobject.cpp:3069
#15 0x00007f35f0383f35 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#16 0x00007f35f038556e in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#17 0x00007f35f03872bf in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#18 0x00007f360d9ea1f2 in QMetaObject::activate (sender=0x13cebf0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x1) at kernel/qobject.cpp:3069
#19 0x00007f360c1ceab2 in KWindowSystem::windowRemoved (this=0x0, _t1=66057425) at /build/buildd/kde4libs-4.2.95/obj-x86_64-linux-gnu/kdeui/kwindowsystem.moc:127
#20 0x00007f360c1d0ffb in KWindowSystemPrivate::removeClient (this=0x13cee80, w=66057425) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#21 0x00007f360c1dffe1 in NETRootInfo::update (this=0x13ceea8, dirty_props=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#22 0x00007f360c1e036b in NETRootInfo::event (this=0x13ceea8, event=<value optimized out>, properties=0x7fff15eead60, properties_size=5)
    at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#23 0x00007f360c1d12cb in KWindowSystemPrivate::x11Event (this=0x13cee80, ev=0x7fff15eeb750) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#24 0x00007f360c0a0a43 in KApplication::x11EventFilter (this=<value optimized out>, _event=0x7fff15eeb750) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#25 0x00007f36017d5b57 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#26 0x00007f360afbab1f in qt_x11EventFilter (ev=0x7fff15eeb750) at kernel/qapplication_x11.cpp:375
#27 0x00007f360afcdfaf in QApplication::x11ProcessEvent (this=0x10890d0, event=0x7fff15eeb750) at kernel/qapplication_x11.cpp:3273
#28 0x00007f360aff7464 in x11EventSourceDispatch (s=0x109e020, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007f36099bc20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0x00007f36099bf8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#31 0x00007f36099bfa7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0x00007f360d9fde6f in QEventDispatcherGlib::processEvents (this=0x10999d0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#33 0x00007f360aff6bef in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#34 0x00007f360d9d3002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 367966784}) at kernel/qeventloop.cpp:149
#35 0x00007f360d9d33cd in QEventLoop::exec (this=0x7fff15eeba80, flags={i = 367966864}) at kernel/qeventloop.cpp:200
#36 0x00007f360d9d5694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#37 0x00007f36017c263b in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#38 0x000000000040714e in launch (argc=1, _name=0x104b538 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x104b558 "", 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=0x7fff15eec918, envp=0x7fff15eec930) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi