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: 4.5.2
Operating System: Linux 2.6.30-desktop-2mnb i686
Distribution: "Mandriva Linux 2009.1"

What I was doing when the application crashed:
As title, plasma crashed after clicking on 'Check Mail' button in kmail.  This happnes fairly regularly but not every time, about 35-40% of the time maybe.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5ec1a80 (LWP 22355))]

Thread 2 (Thread 0xa8e2cb70 (LWP 22358)):
#0  0xffffe424 in __kernel_vsyscall ()
#1  0xb7d55ad5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/libpthread.so.0
#2  0xb7db1280 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#3  0xb64f6d5c in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7db0143 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7d518e5 in start_thread () from /lib/i686/libpthread.so.0
#6  0xb67a2bbe in clone () from /lib/i686/libc.so.6

Thread 1 (Thread 0xb5ec1a80 (LWP 22355)):
[KCrash Handler]
#6  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x9ac6bd8, newIndex=2) at /usr/src/debug/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#7  0xa916a3e8 in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x95c00b0, group=0x99b7f58) at /usr/src/debug/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#8  0xa9174d85 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x95c00b0) at /usr/src/debug/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#9  0xa9175793 in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x95c00b0, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbf846c98)
    at /usr/src/debug/kdebase-workspace-4.2.95/build/libs/taskmanager/programgroupingstrategy.moc:68
#10 0xb7ebff29 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#11 0xb7ec0c65 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0xa9188475 in TaskManager::TaskGroup::itemRemoved (this=0x99b7f58, _t1=0x8c15798) at /usr/src/debug/kdebase-workspace-4.2.95/build/libs/taskmanager/taskgroup.moc:146
#13 0xa9189d2b in TaskManager::TaskGroup::remove (this=0x99b7f58, item=0x8c15798) at /usr/src/debug/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#14 0xa916dc46 in TaskManager::GroupManagerPrivate::removeTask (this=0x965a988, task={d = 0x97cdb40}) at /usr/src/debug/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#15 0xa916efa6 in TaskManager::GroupManager::qt_metacall (this=0x96540b0, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbf846e58)
    at /usr/src/debug/kdebase-workspace-4.2.95/build/libs/taskmanager/groupmanager.moc:105
#16 0xb7ebff29 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#17 0xb7ec0c65 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xa918c555 in TaskManager::TaskManager::taskRemoved (this=0x9659b40, _t1={d = 0x97cdb40}) at /usr/src/debug/kdebase-workspace-4.2.95/build/libs/taskmanager/taskmanager.moc:162
#19 0xa918d399 in TaskManager::TaskManager::windowRemoved (this=0x9659b40, w=39865418) at /usr/src/debug/kdebase-workspace-4.2.95/libs/taskmanager/taskmanager.cpp:278
#20 0xa918df45 in TaskManager::TaskManager::qt_metacall (this=0x9659b40, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbf846fe8)
    at /usr/src/debug/kdebase-workspace-4.2.95/build/libs/taskmanager/taskmanager.moc:110
#21 0xb7ebff29 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#22 0xb7ec0c65 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb75bd0b5 in KWindowSystem::windowRemoved (this=0x8c6a590, _t1=39865418) at /usr/src/debug/kdelibs-4.2.95/build/kdeui/kwindowsystem.moc:127
#24 0xb75bfbd8 in KWindowSystemPrivate::removeClient (this=0x8cbd380, w=39865418) at /usr/src/debug/kdelibs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:249
#25 0xb75cd2be in NETRootInfo::update (this=0x8cbd394, dirty_props=0xbf847158) at /usr/src/debug/kdelibs-4.2.95/kdeui/windowmanagement/netwm.cpp:2135
#26 0xb75ce500 in NETRootInfo::event (this=0x8cbd394, event=<value optimized out>, properties=0xbf847240, properties_size=5) at /usr/src/debug/kdelibs-4.2.95/kdeui/windowmanagement/netwm.cpp:2058
#27 0xb75bfcb7 in KWindowSystemPrivate::x11Event (this=0x8cbd380, ev=0xbf84889c) at /usr/src/debug/kdelibs-4.2.95/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#28 0xb7484e7a in KAppX11HackWidget::publicx11Event (this=0x8cbd380, e=0xbf84889c) at /usr/src/debug/kdelibs-4.2.95/kdeui/kernel/kapplication.cpp:900
#29 0xb7481c6a in KApplication::x11EventFilter (this=0x8ac1148, _event=0xbf84889c) at /usr/src/debug/kdelibs-4.2.95/kdeui/kernel/kapplication.cpp:950
#30 0xb49706bc in PlasmaApp::x11EventFilter (this=0x8ac1148, event=0xbf84889c) at /usr/src/debug/kdebase-workspace-4.2.95/plasma/shells/desktop/plasmaapp.cpp:490
#31 0xb6a92041 in ?? () from /usr/lib/libQtGui.so.4
#32 0xb6aa3bcd in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0xb6ad07c8 in ?? () from /usr/lib/libQtGui.so.4
#34 0xb6618e32 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb661c4a8 in ?? () from /usr/lib/libglib-2.0.so.0
#36 0xb661c5ce in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0xb7ed59d8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0xb6acfefa in ?? () from /usr/lib/libQtGui.so.4
#39 0xb7ea7d8d in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb7ea81d9 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0xb7eaa6c0 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0xb6a2cf44 in QApplication::exec () from /usr/lib/libQtGui.so.4
#43 0xb49584ce in kdemain (argc=1, argv=0x8a98dd0) at /usr/src/debug/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#44 0x0804db4a in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x8a961e8 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x8051ba8 "0") at /usr/src/debug/kdelibs-4.2.95/kinit/kinit.cpp:672
#45 0x0804e2a5 in handle_launcher_request (sock=7, who=<value optimized out>) at /usr/src/debug/kdelibs-4.2.95/kinit/kinit.cpp:1164
#46 0x0804f014 in handle_requests (waitForPid=<value optimized out>) at /usr/src/debug/kdelibs-4.2.95/kinit/kinit.cpp:1357
#47 0x0804f8a5 in main (argc=2, argv=0xbf849274, envp=0xbf849280) at /usr/src/debug/kdelibs-4.2.95/kinit/kinit.cpp:1784

This bug may be a duplicate of or related to bug 198128

Reported using DrKonqi