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 i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I was normally using thunderbird when the panel disappeared and then reappear with the notification of crash with error 11.
I was doing whatever I always do in my normal use of my pc.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3236)]

Thread 2 (Thread 0xa8aefb90 (LWP 3239)):
#0  0xb7ff5430 in __kernel_vsyscall ()
#1  0xb64bf0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb669f2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7df29b2 in QWaitCondition::wait (this=0xa750ac8, mutex=0xa750ac4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb772e152 in QHostInfoAgent::run (this=0xa750ab8) at kernel/qhostinfo.cpp:260
#5  0xb7df196e in QThreadPrivate::start (arg=0xa750ab8) at thread/qthread_unix.cpp:189
#6  0xb64bb4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb669049e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5fc9a10 (LWP 3236)):
[KCrash Handler]
#6  0xa95a832a in TaskManager::GroupManager::manualSortingRequest () from /usr/lib/libtaskmanager.so.4
#7  0xa95a631b in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#8  0xa95adf27 in ?? () from /usr/lib/libtaskmanager.so.4
#9  0xa95aee5b in ?? () from /usr/lib/libtaskmanager.so.4
#10 0xb7efbca8 in QMetaObject::activate (sender=0xa44bce8, from_signal_index=22, to_signal_index=22, argv=0xbfd1227c) at kernel/qobject.cpp:3069
#11 0xb7efc932 in QMetaObject::activate (sender=0xa44bce8, m=0xa95d0b74, local_signal_index=1, argv=0xbfd1227c) at kernel/qobject.cpp:3143
#12 0xa95c1d83 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#13 0xa95c27ab in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#14 0xa95a8ba5 in ?? () from /usr/lib/libtaskmanager.so.4
#15 0xa95ab46a in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#16 0xb7efbca8 in QMetaObject::activate (sender=0xa59b2e0, from_signal_index=5, to_signal_index=5, argv=0xbfd1240c) at kernel/qobject.cpp:3069
#17 0xb7efc932 in QMetaObject::activate (sender=0xa59b2e0, m=0xa95d0d3c, local_signal_index=1, argv=0xbfd1240c) at kernel/qobject.cpp:3143
#18 0xa95c5823 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#19 0xa95c70cf in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#20 0xa95c8fec in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#21 0xb7efbca8 in QMetaObject::activate (sender=0xa293868, from_signal_index=6, to_signal_index=6, argv=0xbfd1257c) at kernel/qobject.cpp:3069
#22 0xb7efc932 in QMetaObject::activate (sender=0xa293868, m=0xb766426c, local_signal_index=2, argv=0xbfd1257c) at kernel/qobject.cpp:3143
#23 0xb75fc853 in KWindowSystem::windowRemoved (this=0xa293868, _t1=50331673) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#24 0xb75ff0d6 in KWindowSystemPrivate::removeClient (this=0xa0bc160, w=50331673) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb760e753 in NETRootInfo::update (this=0xa0bc174, dirty_props=0xbfd126c4) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#26 0xb760eb3f in NETRootInfo::event (this=0xa0bc174, event=0xbfd12ddc, properties=0xbfd127a8, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb75ff36d in KWindowSystemPrivate::x11Event (this=0xa0bc160, ev=0xbfd12d7c) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb74af6f9 in KApplication::x11EventFilter (this=0x9f99988, _event=0xbfd12d7c) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#29 0xb4b35e37 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#30 0xb69d8f3e in qt_x11EventFilter (ev=0xbfd12d7c) at kernel/qapplication_x11.cpp:375
#31 0xb69eb6a8 in QApplication::x11ProcessEvent (this=0x9f99988, event=0xbfd12d7c) at kernel/qapplication_x11.cpp:3273
#32 0xb6a17c6a in x11EventSourceDispatch (s=0x9fc22b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0xb6508b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb650c0eb in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb650c268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb7f11438 in QEventDispatcherGlib::processEvents (this=0x9fbcd78, flags={i = -1076809928}) at kernel/qeventdispatcher_glib.cpp:323
#37 0xb6a17365 in QGuiEventDispatcherGlib::processEvents (this=0x9fbcd78, flags={i = -1076809880}) at kernel/qguieventdispatcher_glib.cpp:202
#38 0xb7ee406a in QEventLoop::processEvents (this=0xbfd12fe0, flags={i = -1076809816}) at kernel/qeventloop.cpp:149
#39 0xb7ee44aa in QEventLoop::exec (this=0xbfd12fe0, flags={i = -1076809752}) at kernel/qeventloop.cpp:200
#40 0xb7ee6959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#41 0xb6975d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#42 0xb4b20510 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#43 0x0804e1c0 in launch (argc=1, _name=0x9fa483c "/usr/bin/plasma-desktop", args=0x9fa4854 "", cwd=0x0, envc=0, envs=0x9fa4858 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80512d1 "0") at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:672
#44 0x0804e99d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1164
#45 0x0804ef25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1357
#46 0x0804fb0a in main (argc=2, argv=0xbfd137d4, envp=0xbfd137e0) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi