Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.88 (KDE 4.2.88 (KDE 4.3 >= 20090527)) "release 135"
Qt Version: 4.5.1
Operating System: Linux 2.6.27.21-0.1-default i686

What I was doing when the application crashed:
Started KNetwork and opened Firefox , got crash error handler . Brought system out of Screensaver and clicked KNetowk to start network connection , then FireFox , got crash error handler .

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Aborted
[Current thread is 1 (Thread 0xb5ef4700 (LWP 3507))]

Thread 2 (Thread 0xa837fb90 (LWP 3510)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7d9fc35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7dff722 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb7678ae2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0xb7dfe70e in ?? () from /usr/lib/libQtCore.so.4
#5  0xb7d9c1b5 in start_thread () from /lib/libpthread.so.0
#6  0xb65bb3be in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb5ef4700 (LWP 3507)):
[KCrash Handler]
#6  0xffffe430 in __kernel_vsyscall ()
#7  0xb6514990 in raise () from /lib/libc.so.6
#8  0xb65162c8 in abort () from /lib/libc.so.6
#9  0xb6556683 in ?? () from /lib/libc.so.6
#10 0xb6557edb in free () from /lib/libc.so.6
#11 0xb6737ec1 in operator delete(void*) () from /usr/lib/libstdc++.so.6
#12 0xb6737f1d in operator delete[](void*) () from /usr/lib/libstdc++.so.6
#13 0xb5c3f152 in Plasma::Animator::timerEvent(QTimerEvent*) () from /usr/lib/libplasma.so.3
#14 0xb7f0326f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#15 0xb689269c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0xb689a99e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0xb73b0b9d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0xb7ef2adb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0xb7f22176 in ?? () from /usr/lib/libQtCore.so.4
#20 0xb7f1e600 in ?? () from /usr/lib/libQtCore.so.4
#21 0xb64389c8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#22 0xb643c083 in ?? () from /usr/lib/libglib-2.0.so.0
#23 0xb643c241 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#24 0xb7f1e558 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#25 0xb6932975 in ?? () from /usr/lib/libQtGui.so.4
#26 0xb7ef10fa in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0xb7ef153a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#28 0xb7ef39e9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#29 0xb6892517 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#30 0xb39e6760 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#31 0x0804e2b0 in _start ()

Reported using DrKonqi