Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-18-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I had about 12 windows open, from various programs, and I tried to open Firefox. While it was loading, Plasma suddenly crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb777b700 (LWP 29982))]

Thread 2 (Thread 0xab5ebb70 (LWP 30011)):
#0  0x0034d422 in __kernel_vsyscall ()
#1  0x004eee15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0x0046387d in __pthread_cond_wait (cond=0x9c65bb0, mutex=0x9c65b98) at forward.c:139
#3  0x0015fe67 in QWaitConditionPrivate::wait (this=0xa0bcf30, mutex=0xa0bcf2c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0xa0bcf30, mutex=0xa0bcf2c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x07081922 in QHostInfoAgent::run (this=0xa0bcf20) at kernel/qhostinfo.cpp:260
#6  0x0015ee32 in QThreadPrivate::start (arg=0xa0bcf20) at thread/qthread_unix.cpp:188
#7  0x004ea80e in start_thread (arg=0xab5ebb70) at pthread_create.c:300
#8  0x004568de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb777b700 (LWP 29982)):
[KCrash Handler]
#6  0x000007f8 in ?? ()
#7  0x01b4a8aa in TaskItemLayout::remove (this=0xace5f90, item=0xac1b818) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:141
#8  0x01b4aaec in TaskItemLayout::removeTaskItem (this=0x9cd4c40, item=0xac1b818) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:93
#9  0x01b5794f in TaskGroupItem::itemPositionChanged (this=0xa086e70, item=0xad03770) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:882
#10 0x01b57dff in TaskGroupItem::qt_metacall (this=0xa086e70, _c=QMetaObject::InvokeMetaMethod, _id=33, _a=0xbfd43f58) at ./taskgroupitem.moc:116
#11 0x00265263 in QMetaObject::activate (sender=0xa08a508, from_signal_index=24, to_signal_index=24, argv=0xbfd43f58) at kernel/qobject.cpp:3113
#12 0x00265ec2 in QMetaObject::activate (sender=0xa08a508, m=0x840ebf4, local_signal_index=3, argv=0xbfd43f58) at kernel/qobject.cpp:3187
#13 0x08400353 in TaskManager::TaskGroup::itemPositionChanged (this=0xa08a508, _t1=0xad03770) at ./taskgroup.moc:165
#14 0x08402913 in TaskManager::TaskGroup::moveItem (this=0xa08a508, oldIndex=6, newIndex=3) at ../../../libs/taskmanager/taskgroup.cpp:568
#15 0x083e6bd1 in TaskManager::AbstractSortingStrategy::check (this=0xa089e38, itemToCheck=0x0) at ../../../libs/taskmanager/abstractsortingstrategy.cpp:149
#16 0x083e6f9b in TaskManager::AbstractSortingStrategy::qt_metacall (this=0xa089e38, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfd4411c) at ./abstractsortingstrategy.moc:74
#17 0x083eb8b2 in TaskManager::AlphaSortingStrategy::qt_metacall (this=0xa089e38, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfd4411c) at ./alphasortingstrategy.moc:58
#18 0x00265263 in QMetaObject::activate (sender=0xad03770, from_signal_index=21, to_signal_index=21, argv=0x0) at kernel/qobject.cpp:3113
#19 0x00265ec2 in QMetaObject::activate (sender=0xad03770, m=0x840ecdc, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#20 0x08402b27 in TaskManager::TaskItem::gotTaskPointer (this=0xad03770) at ./taskitem.moc:116
#21 0x0840333c in TaskManager::TaskItem::setTaskPointer (this=0xad03770, task=) at ../../../libs/taskmanager/taskitem.cpp:99
#22 0x083e82a2 in TaskManager::GroupManagerPrivate::addTask (this=0x9cdc448, task=) at ../../../libs/taskmanager/groupmanager.cpp:268
#23 0x083ea343 in TaskManager::GroupManager::qt_metacall (this=0x9dd37d0, _c=QMetaObject::InvokeMetaMethod, _id=10, _a=0xbfd44388) at ./groupmanager.moc:103
#24 0x00265263 in QMetaObject::activate (sender=0x9c48d88, from_signal_index=4, to_signal_index=4, argv=0xbfd44388) at kernel/qobject.cpp:3113
#25 0x00265ec2 in QMetaObject::activate (sender=0x9c48d88, m=0x840edbc, local_signal_index=0, argv=0xbfd44388) at kernel/qobject.cpp:3187
#26 0x08403e83 in TaskManager::TaskManager::taskAdded (this=0x9c48d88, _t1=...) at ./taskmanager.moc:155
#27 0x08406063 in TaskManager::TaskManager::windowAdded (this=0x9c48d88, w=90177584) at ../../../libs/taskmanager/taskmanager.cpp:262
#28 0x084074df in TaskManager::TaskManager::qt_metacall (this=0x9c48d88, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfd44558) at ./taskmanager.moc:109
#29 0x00265263 in QMetaObject::activate (sender=0x9a39418, from_signal_index=5, to_signal_index=5, argv=0xbfd44558) at kernel/qobject.cpp:3113
#30 0x00265ec2 in QMetaObject::activate (sender=0x9a39418, m=0x131726c, local_signal_index=1, argv=0xbfd44558) at kernel/qobject.cpp:3187
#31 0x012ae3d3 in KWindowSystem::windowAdded (this=0x9a39418, _t1=90177584) at ./kwindowsystem.moc:120
#32 0x012b1496 in KWindowSystemPrivate::addClient (this=0x9a7e780, w=90177584) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:229
#33 0x012bfb27 in NETRootInfo::update (this=0x9a7e794, dirty_props=0xbfd44708) at ../../kdeui/windowmanagement/netwm.cpp:2186
#34 0x012c0667 in NETRootInfo::event (this=0x9a7e794, event=<value optimized out>, properties=0xbfd447f4, properties_size=5) at ../../kdeui/windowmanagement/netwm.cpp:2058
#35 0x012b1881 in KWindowSystemPrivate::x11Event (this=0x9a7e780, ev=0xbfd45dfc) at ../../kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#36 0x0115e536 in KAppX11HackWidget::publicx11Event (this=0x98c4408, _event=0xbfd45dfc) at ../../kdeui/kernel/kapplication.cpp:911
#37 KApplication::x11EventFilter (this=0x98c4408, _event=0xbfd45dfc) at ../../kdeui/kernel/kapplication.cpp:961
#38 0x017b571a in PlasmaApp::x11EventFilter (this=0x98c4408, event=0xbfd45dfc) at ../../../../plasma/shells/desktop/plasmaapp.cpp:490
#39 0x054d6d70 in qt_x11EventFilter (ev=0xbfd45dfc) at kernel/qapplication_x11.cpp:375
#40 0x054e8375 in QApplication::x11ProcessEvent (this=0x98c4408, event=0xbfd45dfc) at kernel/qapplication_x11.cpp:3271
#41 0x05516502 in x11EventSourceDispatch (s=0x98edf00, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#42 0x00ac7e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#43 0x00acb730 in ?? () from /lib/libglib-2.0.so.0
#44 0x00acb863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#45 0x0027a02c in QEventDispatcherGlib::processEvents (this=0x98eb0d8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#46 0x05515be5 in QGuiEventDispatcherGlib::processEvents (this=0x98eb0d8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#47 0x0024dc79 in QEventLoop::processEvents (this=0xbfd460f4, flags=) at kernel/qeventloop.cpp:149
#48 0x0024e0ca in QEventLoop::exec (this=0xbfd460f4, flags=...) at kernel/qeventloop.cpp:201
#49 0x0025053f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#50 0x05474dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#51 0x0179f80d in kdemain (argc=1, argv=0x985c9e0) at ../../../../plasma/shells/desktop/main.cpp:50
#52 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x987c3d0 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#53 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#54 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#55 0x0804fbaf in main (argc=2, argv=0xbfd46954, envp=0xbfd46960) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi