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 2.6.30-020630-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Kubuntu 9.04 with KDE 4.3 RC1
Workspace started crashing yesterday and I think it has something to do with Kmail. It's impossible for me to reproduce the crash but it seems to happen when changing Kmail's settings and saving them. Right now the workspace crashed when I change from Long folder list to Short folder list and clicked OK.

The problem began yesterday after I decided to see if I can use Kmail in the office instead of Outlook.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 23548)]

Thread 2 (Thread 0xa9459b90 (LWP 23580)):
#0  0xb806c430 in __kernel_vsyscall ()
#1  0xb653b0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb671b2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7e6e9b2 in QWaitCondition::wait (this=0x8eb6880, mutex=0x8eb687c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb77aa152 in QHostInfoAgent::run (this=0x8eb6870) at kernel/qhostinfo.cpp:260
#5  0xb7e6d96e in QThreadPrivate::start (arg=0x8eb6870) at thread/qthread_unix.cpp:189
#6  0xb65374ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb670c49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb6045a10 (LWP 23548)):
[KCrash Handler]
#6  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x9029310, newIndex=2) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#7  0xa95fa31b in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x8ff7a98, group=0x9935630) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#8  0xa9601f27 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x8ff7a98) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#9  0xa9602e5b in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x8ff7a98, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfde8abc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#10 0xb7f77ca8 in QMetaObject::activate (sender=0x9935630, from_signal_index=22, to_signal_index=22, argv=0xbfde8abc) at kernel/qobject.cpp:3069
#11 0xb7f78932 in QMetaObject::activate (sender=0x9935630, m=0xa9624b74, local_signal_index=1, argv=0xbfde8abc) at kernel/qobject.cpp:3143
#12 0xa9615d83 in TaskManager::TaskGroup::itemRemoved (this=0x9935630, _t1=0x8fe7ec0) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskgroup.moc:146
#13 0xa96167ab in TaskManager::TaskGroup::remove (this=0x9935630, item=0x8fe7ec0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#14 0xa95fcba5 in TaskManager::GroupManagerPrivate::removeTask (this=0x8d97d80, task={d = 0xbfde8b6c}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#15 0xa95ff46a in TaskManager::GroupManager::qt_metacall (this=0x8d983d0, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfde8c4c)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/groupmanager.moc:105
#16 0xb7f77ca8 in QMetaObject::activate (sender=0x8d983e8, from_signal_index=5, to_signal_index=5, argv=0xbfde8c4c) at kernel/qobject.cpp:3069
#17 0xb7f78932 in QMetaObject::activate (sender=0x8d983e8, m=0xa9624d3c, local_signal_index=1, argv=0xbfde8c4c) at kernel/qobject.cpp:3143
#18 0xa9619823 in TaskManager::TaskManager::taskRemoved (this=0x8d983e8, _t1={d = 0xbfde8c94}) at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:162
#19 0xa961b0cf in TaskManager::TaskManager::windowRemoved (this=0x8d983e8, w=29421872) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:279
#20 0xa961cfec in TaskManager::TaskManager::qt_metacall (this=0x8d983e8, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfde8dbc)
    at /build/buildd/kdebase-workspace-4.2.95/obj-i486-linux-gnu/libs/taskmanager/taskmanager.moc:110
#21 0xb7f77ca8 in QMetaObject::activate (sender=0x8a8b520, from_signal_index=6, to_signal_index=6, argv=0xbfde8dbc) at kernel/qobject.cpp:3069
#22 0xb7f78932 in QMetaObject::activate (sender=0x8a8b520, m=0xb76e026c, local_signal_index=2, argv=0xbfde8dbc) at kernel/qobject.cpp:3143
#23 0xb7678853 in KWindowSystem::windowRemoved (this=0x8a8b520, _t1=29421872) at /build/buildd/kde4libs-4.2.95/obj-i486-linux-gnu/kdeui/kwindowsystem.moc:127
#24 0xb767b0d6 in KWindowSystemPrivate::removeClient (this=0x8918348, w=29421872) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb768a753 in NETRootInfo::update (this=0x891835c, dirty_props=0xbfde8f04) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#26 0xb768ab3f in NETRootInfo::event (this=0x891835c, event=0xbfde961c, properties=0xbfde8fe8, properties_size=5) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb767b36d in KWindowSystemPrivate::x11Event (this=0x8918348, ev=0xbfde95bc) at /build/buildd/kde4libs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb752b6f9 in KApplication::x11EventFilter (this=0x8840d38, _event=0xbfde95bc) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:911
#29 0xb4bb2e37 in PlasmaApp::x11EventFilter (this=0x8840d38, event=0xbfde95bc) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#30 0xb6a54f3e in qt_x11EventFilter (ev=0xbfde95bc) at kernel/qapplication_x11.cpp:375
#31 0xb6a676a8 in QApplication::x11ProcessEvent (this=0x8840d38, event=0xbfde95bc) at kernel/qapplication_x11.cpp:3273
#32 0xb6a93c6a in x11EventSourceDispatch (s=0x88498b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#33 0xb6584b88 in IA__g_main_context_dispatch (context=0x8848c98) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#34 0xb65880eb in g_main_context_iterate (context=0x8848c98, block=1, dispatch=1, self=0x8846618) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#35 0xb6588268 in IA__g_main_context_iteration (context=0x8848c98, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#36 0xb7f8d438 in QEventDispatcherGlib::processEvents (this=0x8844410, flags={i = -1075931272}) at kernel/qeventdispatcher_glib.cpp:323
#37 0xb6a93365 in QGuiEventDispatcherGlib::processEvents (this=0x8844410, flags={i = -1075931224}) at kernel/qguieventdispatcher_glib.cpp:202
#38 0xb7f6006a in QEventLoop::processEvents (this=0xbfde9820, flags={i = -1075931160}) at kernel/qeventloop.cpp:149
#39 0xb7f604aa in QEventLoop::exec (this=0xbfde9820, flags={i = -1075931096}) at kernel/qeventloop.cpp:200
#40 0xb7f62959 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#41 0xb69f1d17 in QApplication::exec () at kernel/qapplication.cpp:3553
#42 0xb4b9d510 in kdemain (argc=1, argv=0x87e2b40) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#43 0x0804e1c0 in launch (argc=1, _name=0x882d9d4 "/usr/bin/plasma-desktop", args=0x882d9ec "", cwd=0x0, envc=0, envs=0x882d9f0 "", 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=0xbfdea014, envp=0xbfdea020) at /build/buildd/kde4libs-4.2.95/kinit/kinit.cpp:1784

Reported using DrKonqi