Version:            (using KDE 4.2.1)
Installed from:    Fedora RPMs

I thought maybe these were fixed in 4.2.1, but apparantly not.

Application: Plasma Workspace (plasma), signal SIGSEGV
0x0000003840aa7f81 in nanosleep () from /lib64/libc.so.6
[Current thread is 1 (Thread 0x7f06f0bda850 (LWP 7592))]

Thread 3 (Thread 0x7f06de408950 (LWP 7595)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x0000003f70c5a839 in QWaitConditionPrivate::wait () at thread/qwaitcondition_unix.cpp:82
#2  QWaitCondition::wait (this=0x7f06dfd5a0d0, mutex=0x7f06dfd5a0c8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:154
#3  0x0000003ed4272eac in QHostInfoAgent::run (this=0x7f06dfd5a0b0) at kernel/qhostinfo.cpp:241
#4  0x0000003f70c59852 in QThreadPrivate::start (arg=0x7f06dfd5a0b0) at thread/qthread_unix.cpp:185
#5  0x00000038416073da in start_thread (arg=<value optimized out>) at pthread_create.c:297
#6  0x0000003840ae62bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

Thread 2 (Thread 0x7f06dcda4950 (LWP 7596)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x0000003f70c5a839 in QWaitConditionPrivate::wait () at thread/qwaitcondition_unix.cpp:82
#2  QWaitCondition::wait (this=0x7f06e0d448c0, mutex=0x7f06e0d448b8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:154
#3  0x00007f06dec4dfa0 in ?? () from /usr/lib64/kde4/plasma_wallpaper_image.so
#4  0x0000003f70c59852 in QThreadPrivate::start (arg=0x7f06e0d448a8) at thread/qthread_unix.cpp:185
#5  0x00000038416073da in start_thread (arg=<value optimized out>) at pthread_create.c:297
#6  0x0000003840ae62bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
Current language:  auto; currently asm

Thread 1 (Thread 0x7f06f0bda850 (LWP 7592)):
[KCrash Handler]
#5  QHashData::nextNode (node=0x7f06dd31cff0) at tools/qhash.cpp:224
#6  0x00007f06e06a4b62 in TaskManager::GroupManager::add () from /usr/lib64/libtaskmanager.so.4
#7  0x00007f06e06a651b in TaskManager::GroupManager::qt_metacall () from /usr/lib64/libtaskmanager.so.4
#8  0x0000003f70d56764 in QMetaObject::activate (sender=0x7f06de98c6d0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x1) at kernel/qobject.cpp:3031
#9  0x00007f06e06babf2 in TaskManager::TaskManager::taskAdded () from /usr/lib64/libtaskmanager.so.4
#10 0x00007f06e06bcc3f in TaskManager::TaskManager::windowAdded () from /usr/lib64/libtaskmanager.so.4
#11 0x00007f06e06bdc2f in TaskManager::TaskManager::qt_metacall () from /usr/lib64/libtaskmanager.so.4
#12 0x0000003f70d56764 in QMetaObject::activate (sender=0x1f2ff10, from_signal_index=<value optimized out>, to_signal_index=5, argv=0x1) at kernel/qobject.cpp:3031
#13 0x0000003461526fb2 in KWindowSystem::windowAdded (this=0x7f06dd31cff0, _t1=67108865) at /usr/src/debug/kdelibs-4.2.1/x86_64-redhat-linux-gnu/kdeui/kwindowsystem.moc:118
#14 0x000000346152930c in KWindowSystemPrivate::addClient (this=0x2014990, w=67108865) at /usr/src/debug/kdelibs-4.2.1/kdeui/windowmanagement/kwindowsystem_x11.cpp:229
#15 0x0000003461538318 in NETRootInfo::update (this=0x20149b8, dirty_props=<value optimized out>) at /usr/src/debug/kdelibs-4.2.1/kdeui/windowmanagement/netwm.cpp:2123
#16 0x000000346153868b in NETRootInfo::event (this=0x20149b8, event=<value optimized out>, properties=0x7ffff8c40400, properties_size=5)
    at /usr/src/debug/kdelibs-4.2.1/kdeui/windowmanagement/netwm.cpp:2052
#17 0x000000346152978b in KWindowSystemPrivate::x11Event (this=0x2014990, ev=0x7ffff8c40d20) at /usr/src/debug/kdelibs-4.2.1/kdeui/windowmanagement/kwindowsystem_x11.cpp:136
#18 0x0000003461404353 in KAppX11HackWidget::publicx11Event () at /usr/src/debug/kdelibs-4.2.1/kdeui/kernel/kapplication.cpp:935
#19 KApplication::x11EventFilter (this=<value optimized out>, _event=0x7ffff8c40d20) at /usr/src/debug/kdelibs-4.2.1/kdeui/kernel/kapplication.cpp:985
#20 0x0000003460242814 in ?? () from /usr/lib64/libkdeinit4_plasma.so
#21 0x000000345ebdb49f in qt_x11EventFilter (ev=0x7ffff8c40d20) at kernel/qapplication_x11.cpp:361
#22 0x000000345ebecb56 in QApplication::x11ProcessEvent (this=0x1f29410, event=0x7ffff8c40d20) at kernel/qapplication_x11.cpp:2922
#23 0x000000345ec13ae4 in x11EventSourceDispatch (s=0x1f3f790, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:142
#24 0x000000386763779b in g_main_dispatch () at gmain.c:2144
#25 IA__g_main_context_dispatch (context=0x1f3e920) at gmain.c:2697
#26 0x000000386763af6d in g_main_context_iterate (context=0x1f3e920, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2778
#27 0x000000386763b12b in IA__g_main_context_iteration (context=0x1f3e920, may_block=1) at gmain.c:2841
#28 0x0000003f70d6a79f in QEventDispatcherGlib::processEvents (this=0x1f3b1a0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:319
#29 0x000000345ec1328f in QGuiEventDispatcherGlib::processEvents (this=0x7f06dd31cff0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:198
#30 0x0000003f70d40cb2 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:143
#31 0x0000003f70d40e3d in QEventLoop::exec (this=0x7ffff8c41050, flags=) at kernel/qeventloop.cpp:194
#32 0x0000003f70d432ed in QCoreApplication::exec () at kernel/qcoreapplication.cpp:845
#33 0x000000346023421b in kdemain () from /usr/lib64/libkdeinit4_plasma.so
#34 0x0000003840a1e576 in __libc_start_main (main=0x400830 <_start+240>, argc=1, ubp_av=0x7ffff8c41358, init=0x400860 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7ffff8c41348) at libc-start.c:220
#35 0x0000000000400769 in _start ()
Current language:  auto; currently c