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:
Often, when i start dolphin or any other application, which usese a file manager, plasma crashes and restarts automatically.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4664)]

Thread 2 (Thread 0x7fac3ce9c950 (LWP 4669)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fac5e8d6d19 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fac5d75c81c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fac5e8d5d35 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fac5a7ca3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007fac5b3aefcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fac5ee9c750 (LWP 4664)):
[KCrash Handler]
#5  0x00007fac5c573734 in QGraphicsLayoutItem::geometry () from /usr/lib/libQtGui.so.4
#6  0x00007fac5c577145 in QGraphicsWidget::size () from /usr/lib/libQtGui.so.4
#7  0x00007fac3f6efe7e in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#8  0x00007fac3f6ec4c2 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#9  0x00007fac3f6f4b37 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#10 0x00007fac3f6e7df0 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#11 0x00007fac3f6e8008 in ?? () from /usr/lib/kde4/plasma_applet_tasks.so
#12 0x00007fac562dfe69 in Plasma::Applet::flushPendingConstraintsEvents () from /usr/lib/libplasma.so.3
#13 0x00007fac562e04b5 in Plasma::Applet::timerEvent () from /usr/lib/libplasma.so.3
#14 0x00007fac5e9cf263 in QObject::event () from /usr/lib/libQtCore.so.4
#15 0x00007fac5c57818b in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
#16 0x00007fac5bf85f4d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#17 0x00007fac5bf8e18a in QApplication::notify () from /usr/lib/libQtGui.so.4
#18 0x00007fac5d098deb in KApplication::notify () from /usr/lib/libkdeui.so.5
#19 0x00007fac5e9bf6ac in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#20 0x00007fac5e9ec516 in ?? () from /usr/lib/libQtCore.so.4
#21 0x00007fac5e9e8b2d in ?? () from /usr/lib/libQtCore.so.4
#22 0x00007fac5aa1920a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007fac5aa1c8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x00007fac5aa1ca7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007fac5e9e8a8f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#26 0x00007fac5c01ebdf in ?? () from /usr/lib/libQtGui.so.4
#27 0x00007fac5e9bdf42 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#28 0x00007fac5e9be314 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#29 0x00007fac5e9c05e4 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#30 0x00007fac528e23eb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#31 0x0000000000407215 in _start ()

This bug may be a duplicate of or related to bug 207074

Reported using DrKonqi