Here using:

Qt: 4.5.2 (KDE-Qt git commit 46a247a2c9a8c0c4456a02f6a0922d859d88fe76
        Date:   Fri Jun 26 13:45:37 2009 +0200)
KDE: 4.3.60 (KDE 4.3.60 (KDE 4.4 >= 20090624))
kdelibs svn rev. 989682 / kdebase svn rev. 989682
on ArchLinux i686 - Kernel 2.6.30

I can't reproduce the crash.

If you can reproduce the crash at will, may you read http://techbase.kde.org/Development/Tutorials/Debugging/How_to_create_useful_crash_reports and post a complete backtrace here? You may need to install the "kdebase-workspace-dbg" package. Thanks

Okay, the crash happens when you use the mouse wheel forward and backwad in a fast switch - up and down the wheel one or two times and back again. Can you reproduce it now? Try out stupid mouse wheel behavior.

I also installed the debug packages but the problem is, that I don't get an bug window from KDE when plasma crashes (I know the back trace dialog from all other apps). How can I get bugsteps from a crashing plasma?

Thanks

I can't reproduce, It may be fixed (or my different configuration isn't allowing me to reproduce it)

Try this:
- Open Konsole
- Type "kquitapp plasma-desktop" press Return
Plasma should close normally
- Type "plasma-desktop" and press Return
Plasma should restart
- Reproduce the crash
You should get the crash + the crash dialog

Thanks

OK, here it is:

Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 0 (LWP 23953)]

Thread 2 (Thread 0x7fe029e58950 (LWP 23954)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe04784a939 in QWaitCondition::wait (this=0x2f1f8f0, mutex=0x2f1f8e8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007fe04ae0e4cc in QHostInfoAgent::run (this=0x2f1f8d0) at kernel/qhostinfo.cpp:260
#3  0x00007fe047849952 in QThreadPrivate::start (arg=0x2f1f8d0) at thread/qthread_unix.cpp:189
#4  0x00007fe043fd63ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fe046da6fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fe04c405790 (LWP 23953)):
[KCrash Handler]
#4  TaskManager::GroupManager::manualSortingRequest (this=0x0, taskItem=0x2edf700, newIndex=0) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:363
#5  0x00007fe02cf54b3a in TaskManager::AbstractGroupingStrategy::closeGroup (this=0x2edf670, group=0x370e7b0)
    at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/abstractgroupingstrategy.cpp:167
#6  0x00007fe02cf5bda8 in TaskManager::ProgramGroupingStrategy::checkGroup (this=0x2edf670) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/strategies/programgroupingstrategy.cpp:204
#7  0x00007fe02cf5cc2d in TaskManager::ProgramGroupingStrategy::qt_metacall (this=0x2edf670, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/programgroupingstrategy.moc:68
#8  0x00007fe0479481f2 in QMetaObject::activate (sender=0x370e7b0, from_signal_index=<value optimized out>, to_signal_index=22, argv=0x1) at kernel/qobject.cpp:3069
#9  0x00007fe02cf6da92 in TaskManager::TaskGroup::itemRemoved (this=0x0, _t1=0x2e20380) at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/taskgroup.moc:146
#10 0x00007fe02cf6e3b1 in TaskManager::TaskGroup::remove (this=0x370e7b0, item=0x2e20380) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/taskgroup.cpp:182
#11 0x00007fe02cf56ed1 in TaskManager::GroupManagerPrivate::removeTask (this=0x2bd7310, task={d = 0x7fff54545ae0}) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:311
#12 0x00007fe02cf5781e in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x2bd7310) at /build/buildd/kdebase-workspace-4.2.95/libs/taskmanager/groupmanager.cpp:164
#13 0x00007fe02cf59472 in TaskManager::GroupManager::qt_metacall (this=0x2c0e750, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff54545c60)
    at /build/buildd/kdebase-workspace-4.2.95/obj-x86_64-linux-gnu/libs/taskmanager/groupmanager.moc:108
#14 0x00007fe0479481f2 in QMetaObject::activate (sender=0x2bd7378, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x1) at kernel/qobject.cpp:3069
#15 0x00007fe0479424d3 in QObject::event (this=0x2bd7378, e=0x2edf700) at kernel/qobject.cpp:1082
#16 0x00007fe04807778d in QApplicationPrivate::notify_helper (this=0x25ead50, receiver=0x2bd7378, e=0x7fff54546310) at kernel/qapplication.cpp:4084
#17 0x00007fe04807f97a in QApplication::notify (this=0x25d3330, receiver=0x2bd7378, e=0x7fff54546310) at kernel/qapplication.cpp:4049
#18 0x00007fe04a74662b in KApplication::notify (this=0x25d3330, receiver=0x2bd7378, event=0x7fff54546310) at /build/buildd/kde4libs-4.2.95/kdeui/kernel/kapplication.cpp:302
#19 0x00007fe04793275c in QCoreApplication::notifyInternal (this=0x25d3330, receiver=0x2bd7378, event=0x7fff54546310) at kernel/qcoreapplication.cpp:602
#20 0x00007fe04795f7f6 in QTimerInfoList::activateTimers (this=0x25ee570) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#21 0x00007fe04795bf0d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:164
#22 0x00007fe0423a620a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007fe0423a98e0 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x00007fe0423a9a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007fe04795be6f in QEventDispatcherGlib::processEvents (this=0x25bad80, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#26 0x00007fe04810fbef in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x00007fe047931002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1414817152}) at kernel/qeventloop.cpp:149
#28 0x00007fe0479313cd in QEventLoop::exec (this=0x7fff545465c0, flags={i = 1414817232}) at kernel/qeventloop.cpp:200
#29 0x00007fe047933694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#30 0x00007fe04c0e063b in kdemain (argc=1, argv=0x7fff545468c8) at /build/buildd/kdebase-workspace-4.2.95/plasma/shells/desktop/main.cpp:50
#31 0x00007fe046cdf5a6 in __libc_start_main (main=0x400890 <main>, argc=1, ubp_av=0x7fff545468c8, init=0x4008c0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff545468b8) at libc-start.c:220
#32 0x00000000004007c9 in _start () at ../sysdeps/x86_64/elf/start.S:113

Maybe it is just a matter of historical config files. I also had crashes when I upgraded from 4.2 to 4.3 but they disappeared when I removed all the config files. But this solution is annoying because I don't wanna reconfigure my desktop after every upgrade ;)

But I guess when I have this problem, others will have it too somewhere. Which config files would you suggest me to try out for removing? Maybe we can find the source of that fail.

*** This bug has been marked as a duplicate of bug 197717 ***