Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-5.slh.2-sidux-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
opened a image by double clicking an image file which successfully opening the image into gwenview, the default application.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb5f38920 (LWP 3673))]

Thread 2 (Thread 0xa82a8b90 (LWP 3676)):
#0  0xb7f48424 in __kernel_vsyscall ()
#1  0xb6668f65 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2  0xb684285d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb7d4c562 in QWaitConditionPrivate::wait (this=0x9fc7410, mutex=0x9fc740c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9fc7410, mutex=0x9fc740c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0xb656f67a in QHostInfoAgent::run (this=0x9fc7400) at kernel/qhostinfo.cpp:260
#6  0xb7d4b582 in QThreadPrivate::start (arg=0x9fc7400) at thread/qthread_unix.cpp:188
#7  0xb66654b5 in start_thread () from /lib/i686/cmov/libpthread.so.0
#8  0xb6833a5e in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5f38920 (LWP 3673)):
[KCrash Handler]
#6  Tasks::itemTopMargin (this=0xa59a638) at ../../../../plasma/applets/tasks/tasks.h:92
#7  AbstractTaskItem::basicPreferredSize (this=0xa59a638) at ../../../../plasma/applets/tasks/abstracttaskitem.cpp:100
#8  0xa841a71c in TaskItemLayout::maximumRows (this=0xa07b5d0) at ../../../../plasma/applets/tasks/taskitemlayout.cpp:185
#9  0xa8423d54 in TaskGroupItem::optimumCapacity (this=0xa0e05e0) at ../../../../plasma/applets/tasks/taskgroupitem.cpp:1224
#10 0xa8415508 in Tasks::adjustGroupingStrategy (this=0x9f50900) at ../../../../plasma/applets/tasks/tasks.cpp:241
#11 0xa841579c in Tasks::constraintsEvent (this=0x9f50900, constraints=...) at ../../../../plasma/applets/tasks/tasks.cpp:165
#12 0xb5ae483e in Plasma::Applet::flushPendingConstraintsEvents (this=0x9f50900) at ../../plasma/applet.cpp:1163
#13 0xb5ae4ed8 in Plasma::Applet::timerEvent (this=0x9f50900, event=0xbfd7d2cc) at ../../plasma/applet.cpp:2110
#14 0xb7e4cbcf in QObject::event (this=0x9f50900, e=0xbfd7d2cc) at kernel/qobject.cpp:1074
#15 0xb7133717 in QGraphicsWidget::event (this=0x9f50900, event=0xbfd7d2cc) at graphicsview/qgraphicswidget.cpp:1340
#16 0xb6ae4814 in QApplicationPrivate::notify_helper (this=0x9bf87f0, receiver=0x9f50900, e=0xbfd7d2cc) at kernel/qapplication.cpp:4056
#17 0xb6aec97e in QApplication::notify (this=0x9bf2958, receiver=0x9f50900, e=0xbfd7d2cc) at kernel/qapplication.cpp:3603
#18 0xb752d4ad in KApplication::notify (this=0x9bf2958, receiver=0x9f50900, event=0xbfd7d2cc) at ../../kdeui/kernel/kapplication.cpp:302
#19 0xb7e3c9cb in QCoreApplication::notifyInternal (this=0x9bf2958, receiver=0x9f50900, event=0xbfd7d2cc) at kernel/qcoreapplication.cpp:610
#20 0xb7e6b361 in QCoreApplication::sendEvent (this=0x9bfaf9c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#21 QTimerInfoList::activateTimers (this=0x9bfaf9c) at kernel/qeventdispatcher_unix.cpp:572
#22 0xb7e67900 in timerSourceDispatch (source=0x9bfaf68) at kernel/qeventdispatcher_glib.cpp:165
#23 0xb66b24b8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0xb66b5a13 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0xb66b5b98 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0xb7e67858 in QEventDispatcherGlib::processEvents (this=0x9bf85e0, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#27 0xb6b83fd5 in QGuiEventDispatcherGlib::processEvents (this=0x9bf85e0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#28 0xb7e3b01a in QEventLoop::processEvents (this=0xbfd7d4f0, flags=...) at kernel/qeventloop.cpp:149
#29 0xb7e3b462 in QEventLoop::exec (this=0xbfd7d4f0, flags=...) at kernel/qeventloop.cpp:201
#30 0xb7e3d8b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#31 0xb6ae4697 in QApplication::exec () at kernel/qapplication.cpp:3525
#32 0xb397bf40 in kdemain (argc=1, argv=0x9b94240) at ../../../../plasma/shells/desktop/main.cpp:50
#33 0x0804e291 in launch (argc=1, _name=0x9bd9cec "/usr/bin/plasma-desktop", args=0x9bd9d04 "", cwd=0x0, envc=0, envs=0x9bd9d08 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x805109f "0") at ../../kinit/kinit.cpp:677
#34 0x0804ea15 in handle_launcher_request (sock=8, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#35 0x0804ef3f in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1362
#36 0x0804f6c9 in main (argc=2, argv=0xbfd7dd74, envp=0xbfd7dd80) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi