Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.95 (KDE 4.2.95 (KDE 4.3 RC1))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-13-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
when i start pidgin...plasma is crash

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 3591)]

Thread 2 (Thread 0x7fc23bb3f950 (LWP 3600)):
#0  0x00007fc256feb2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fc25b166939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fc259fe34cc in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fc25b165952 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fc256fe73ba in start_thread () from /lib/libpthread.so.0
#5  0x00007fc257bcbfcd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc25b73c750 (LWP 3591)):
[KCrash Handler]
#5  0x00007fc257b6a368 in memcpy () from /lib/libc.so.6
#6  0x00007fc25b18982c in QListData::detach2 () from /usr/lib/libQtCore.so.4
#7  0x00007fc23c3d46f3 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#8  0x00007fc23c3d358f in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#9  0x00007fc23c3e49cc in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#10 0x00007fc23c3d1700 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#11 0x00007fc25b2641f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0x00007fc23c3d56f8 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#13 0x00007fc23c3d1633 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#14 0x00007fc23c3d16a5 in ?? () from /usr/lib/kde4/plasma_applet_networkmanagement.so
#15 0x00007fc25b2641f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0x00007fc23c1b0854 in NetworkManagerSettings::connectionAdded () from /usr/lib/libknmdbus.so.4
#17 0x00007fc23c1b21f3 in NetworkManagerSettings::onConnectionAdded () from /usr/lib/libknmdbus.so.4
#18 0x00007fc23c1b23f4 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#19 0x00007fc25b2641f2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0x00007fc23c1b0282 in OrgFreedesktopNetworkManagerSettingsInterface::NewConnection () from /usr/lib/libknmdbus.so.4
#21 0x00007fc23c1b042c in OrgFreedesktopNetworkManagerSettingsInterface::qt_metacall () from /usr/lib/libknmdbus.so.4
#22 0x00007fc23c1b2355 in NetworkManagerSettings::qt_metacall () from /usr/lib/libknmdbus.so.4
#23 0x00007fc2594bff83 in ?? () from /usr/lib/libQtDBus.so.4
#24 0x00007fc2594c7d0f in ?? () from /usr/lib/libQtDBus.so.4
#25 0x00007fc25b25e848 in QObject::event () from /usr/lib/libQtCore.so.4
#26 0x00007fc2587d878d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#27 0x00007fc2587e097a in QApplication::notify () from /usr/lib/libQtGui.so.4
#28 0x00007fc25991b62b in KApplication::notify () from /usr/lib/libkdeui.so.5
#29 0x00007fc25b24e75c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#30 0x00007fc25b24f3ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#31 0x00007fc25b2781e3 in ?? () from /usr/lib/libQtCore.so.4
#32 0x00007fc25723620a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#33 0x00007fc2572398e0 in ?? () from /usr/lib/libglib-2.0.so.0
#34 0x00007fc257239a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#35 0x00007fc25b277e6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#36 0x00007fc258870bef in ?? () from /usr/lib/libQtGui.so.4
#37 0x00007fc25b24d002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#38 0x00007fc25b24d3cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#39 0x00007fc25b24f694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#40 0x00007fc24fe1963b in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#41 0x000000000040714e in _start ()

Reported using DrKonqi