Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.93 (KDE 4.2.93 (KDE 4.3 >= 20090623)) "release 1"
Qt Version: 4.5.1
Operating System: Linux 2.6.30-8-default x86_64

What I was doing when the application crashed:
The old bug doesnt seem to be fixed. I changed the line from SVN commit 985976 and recompiled plasma, but it still crashes.

gdb says:
Program received signal SIGSEGV, Segmentation fault.
0x00007f745ae48c1d in TaskItemLayout::size (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/applets/tasks/taskitemlayout.cpp:152
152             if (item->abstractItem() && item->abstractItem()->isGroupItem()) {

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f74777da760 (LWP 15039))]

Thread 2 (Thread 0x7f7459231910 (LWP 15040)):
#0  0x00007f7472713019 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f74729835fb in QWaitConditionPrivate::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (time=<value optimized out>, this=<value optimized out>) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f74760f54fc in QHostInfoAgent::run (this=0xcc6130) at kernel/qhostinfo.cpp:260
#4  0x00007f7472982551 in QThreadPrivate::start (arg=0xcc6130) at thread/qthread_unix.cpp:189
#5  0x00007f747270e63d in start_thread () from /lib64/libpthread.so.0
#6  0x00007f7471d04b6d in clone () from /lib64/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f74777da760 (LWP 15039)):
[KCrash Handler]
#5  0x00007f745ae48c1d in TaskItemLayout::size (this=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/applets/tasks/taskitemlayout.cpp:152
#6  0x00007f745ae48fc2 in TaskItemLayout::gridLayoutSize (this=0x1214120) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/applets/tasks/taskitemlayout.cpp:220
#7  0x00007f745ae4905b in TaskItemLayout::layoutItems (this=0x1214120) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/applets/tasks/taskitemlayout.cpp:245
#8  0x00007f745ae50eca in TaskGroupItem::constraintsChanged (this=0xd58610, constraints=) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/applets/tasks/taskgroupitem.cpp:694
#9  0x00007f745ae55b64 in TaskGroupItem::qt_metacall (this=0xd58610, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff9cc367a0)
    at /usr/src/debug/kdebase-workspace-4.2.93svn985654/build/plasma/applets/tasks/taskgroupitem.moc:108
#10 0x00007f7472a7d37c in QMetaObject::activate (sender=0xc30950, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0xdc3530) at kernel/qobject.cpp:3120
#11 0x00007f745ae43d72 in Tasks::constraintsChanged (this=0x1214120, _t1=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/build/plasma/applets/tasks/tasks.moc:98
#12 0x00007f745ae4419f in Tasks::constraintsEvent (this=0xc30950, constraints=) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/applets/tasks/tasks.cpp:169
#13 0x00007f7476e128c9 in Plasma::Applet::flushPendingConstraintsEvents (this=0xc30950) at /usr/src/debug/kdelibs-4.2.93svn985654/plasma/applet.cpp:1160
#14 0x00007f7476e13055 in Plasma::Applet::timerEvent (this=0xc30950, event=<value optimized out>) at /usr/src/debug/kdelibs-4.2.93svn985654/plasma/applet.cpp:2090
#15 0x00007f7472a77253 in QObject::event (this=0xc30950, e=0x4) at kernel/qobject.cpp:1082
#16 0x00007f7473743deb in QGraphicsWidget::event (this=0xc30950, event=0x7fff9cc37030) at graphicsview/qgraphicswidget.cpp:1340
#17 0x00007f7473164f9c in QApplicationPrivate::notify_helper (this=0x640ea0, receiver=0xc30950, e=0x7fff9cc37030) at kernel/qapplication.cpp:4057
#18 0x00007f747316c5ee in QApplication::notify (this=0x621fe0, receiver=0xc30950, e=0x7fff9cc37030) at kernel/qapplication.cpp:4022
#19 0x00007f7475a34526 in KApplication::notify (this=0x621fe0, receiver=0xc30950, event=0x7fff9cc37030) at /usr/src/debug/kdelibs-4.2.93svn985654/kdeui/kernel/kapplication.cpp:302
#20 0x00007f7472a67e3c in QCoreApplication::notifyInternal (this=0x621fe0, receiver=0xc30950, event=0x7fff9cc37030) at kernel/qcoreapplication.cpp:610
#21 0x00007f7472a9380d in QCoreApplication::sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#22 QTimerInfoList::activateTimers (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:586
#23 0x00007f7472a9083d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:164
#24 0x00007f746ec59bce in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#25 0x00007f746ec5d2a8 in ?? () from /usr/lib64/libglib-2.0.so.0
#26 0x00007f746ec5d3d0 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#27 0x00007f7472a90786 in QEventDispatcherGlib::processEvents (this=0x6096e0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#28 0x00007f74731f7d4e in QGuiEventDispatcherGlib::processEvents (this=0x1214120, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x00007f7472a66742 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#30 0x00007f7472a66b14 in QEventLoop::exec (this=0x7fff9cc37380, flags=) at kernel/qeventloop.cpp:200
#31 0x00007f7472a68bb9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#32 0x00007f74773de9ff in kdemain (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kdebase-workspace-4.2.93svn985654/plasma/shells/desktop/main.cpp:50
#33 0x00007f7471c52a4d in __libc_start_main () from /lib64/libc.so.6
#34 0x0000000000400819 in _start () at ../sysdeps/x86_64/elf/start.S:113

This bug may be a duplicate of or related to bug 197664

Reported using DrKonqi