Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.85 (KDE 4.2.85 (KDE 4.3 Beta1))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-11-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
desktop crash when start, like example kontact, amarok, kopete or firefox.  after restarts (by clicking windows crash restart option or automatically). That could be sometimes during a KDE Jaunty session.  

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 0 (LWP 4700)]

Thread 2 (Thread 0xa838fb90 (LWP 4703)):
#0  0xb7f28430 in __kernel_vsyscall ()
#1  0xb4fff0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb624f2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb64335b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7891ae2 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb643256e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb4ffb4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb624049e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb3c2a730 (LWP 4700)):
[KCrash Handler]
#6  0xa85e2137 in TaskManager::Task::window () from /usr/lib/libtaskmanager.so.4
#7  0xb6536f0f in QObject::event () from /usr/lib/libQtCore.so.4
#8  0xb6e3a257 in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
#9  0xb67b1bcc in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#10 0xb67b9ede in QApplication::notify () from /usr/lib/libQtGui.so.4
#11 0xb7613c9d in KApplication::notify () from /usr/lib/libkdeui.so.5
#12 0xb65267ab in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#13 0xb6555b31 in ?? () from /usr/lib/libQtCore.so.4
#14 0xb6552280 in ?? () from /usr/lib/libQtCore.so.4
#15 0xb4df9b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0xb4dfd0eb in ?? () from /usr/lib/libglib-2.0.so.0
#17 0xb4dfd268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0xb65521d8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#19 0xb6853765 in ?? () from /usr/lib/libQtGui.so.4
#20 0xb6524dda in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#21 0xb652521a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#22 0xb65276c9 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#23 0xb67b1a47 in QApplication::exec () from /usr/lib/libQtGui.so.4
#24 0xb7ed0290 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#25 0x08048712 in _start ()