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 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
plasma crash, possibly due to task widget trying to allocate space for new entry.

May be duplicate of existing bug, but posting stack trace again to show it's still present with KDE 4.3.1.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 5062)]

Thread 2 (Thread 0x7f968946d950 (LWP 5063)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f96a7b04d19 in QWaitCondition::wait (this=0x1920b30, mutex=0x1920b28, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f96a698a81c in QHostInfoAgent::run (this=0x1920b10) at kernel/qhostinfo.cpp:260
#3  0x00007f96a7b03d35 in QThreadPrivate::start (arg=0x1920b10) at thread/qthread_unix.cpp:188
#4  0x00007f96a39f83ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f96a45dcfcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f96a80c8750 (LWP 5062)):
[KCrash Handler]
#5  AbstractTaskItem::basicPreferredSize (this=0x21fd290) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/tasks.h:92
#6  0x00007f968b6314c2 in TaskItemLayout::maximumRows (this=0x16df340) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/taskitemlayout.cpp:185
#7  0x00007f968b639b37 in TaskGroupItem::optimumCapacity (this=0x16dea60) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/taskgroupitem.cpp:1224
#8  0x00007f968b62cdf0 in Tasks::adjustGroupingStrategy (this=0x141faa0) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/tasks.cpp:241
#9  0x00007f968b62d008 in Tasks::constraintsEvent (this=0x141faa0, constraints={i = -1537002200}) at /build/buildd/kdebase-workspace-4.3.1/plasma/applets/tasks/tasks.cpp:165
#10 0x00007f969f50de69 in Plasma::Applet::flushPendingConstraintsEvents (this=0x141faa0) at /build/buildd/kde4libs-4.3.1/plasma/applet.cpp:1173
#11 0x00007f969f50e4b5 in Plasma::Applet::timerEvent (this=0x141faa0, event=<value optimized out>) at /build/buildd/kde4libs-4.3.1/plasma/applet.cpp:2120
#12 0x00007f96a7bfd263 in QObject::event (this=0x141faa0, e=0x7f96a4633528) at kernel/qobject.cpp:1075
#13 0x00007f96a57a618b in QGraphicsWidget::event (this=0x141faa0, event=0x7fffb00fe9c0) at graphicsview/qgraphicswidget.cpp:1340
#14 0x00007f96a51b3f4d in QApplicationPrivate::notify_helper (this=0xff44d0, receiver=0x141faa0, e=0x7fffb00fe9c0) at kernel/qapplication.cpp:4056
#15 0x00007f96a51bc18a in QApplication::notify (this=0xfb5660, receiver=0x141faa0, e=0x7fffb00fe9c0) at kernel/qapplication.cpp:4021
#16 0x00007f96a62c6deb in KApplication::notify (this=0xfb5660, receiver=0x141faa0, event=0x7fffb00fe9c0) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#17 0x00007f96a7bed6ac in QCoreApplication::notifyInternal (this=0xfb5660, receiver=0x141faa0, event=0x7fffb00fe9c0) at kernel/qcoreapplication.cpp:610
#18 0x00007f96a7c1a516 in QTimerInfoList::activateTimers (this=0xff7a80) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#19 0x00007f96a7c16b2d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#20 0x00007f96a3c4720a in IA__g_main_context_dispatch (context=0xff6920) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#21 0x00007f96a3c4a8e0 in g_main_context_iterate (context=0xff6920, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#22 0x00007f96a3c4aa7c in IA__g_main_context_iteration (context=0xff6920, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#23 0x00007f96a7c16a8f in QEventDispatcherGlib::processEvents (this=0xff4000, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#24 0x00007f96a524cbdf in QGuiEventDispatcherGlib::processEvents (this=0x645f656d6568745f, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#25 0x00007f96a7bebf42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -1341133776}) at kernel/qeventloop.cpp:149
#26 0x00007f96a7bec314 in QEventLoop::exec (this=0x7fffb00fec70, flags={i = -1341133696}) at kernel/qeventloop.cpp:201
#27 0x00007f96a7bee5e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#28 0x00007f969c8233eb in kdemain (argc=1, argv=0xf67e00) at /build/buildd/kdebase-workspace-4.3.1/plasma/shells/desktop/main.cpp:50
#29 0x0000000000407215 in launch (argc=1, _name=0xfa8658 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0xfa8678 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a3a1 "0") at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:677
#30 0x0000000000407a38 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1169
#31 0x0000000000407fe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1362
#32 0x0000000000408b26 in main (argc=2, argv=0x7fffb00ffb18, envp=0x7fffb00ffb30) at /build/buildd/kde4libs-4.3.1/kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 204841

Reported using DrKonqi