Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
It happens when I disconnect network cable and restart system.
No crashes at all when the network cable plugged in. 
Widgets I have:
google translate,
weather,
analog clock,
system information (cpu usage, mem usage, net usage)

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7788700 (LWP 2020))]

Thread 2 (Thread 0xaaa8fb70 (LWP 2023)):
#0  0x00150422 in __kernel_vsyscall ()
#1  0x009c1e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0094c87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00a26e67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x00d7f922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x00a25e32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x009bd80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x0093f8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7788700 (LWP 2020)):
[KCrash Handler]
#6  0x012cb6ee in Plasma::Applet::flushPendingConstraintsEvents() () from /usr/lib/libplasma.so.3
#7  0x012ef7dd in Plasma::Corona::loadLayout(QString const&) () from /usr/lib/libplasma.so.3
#8  0x012f08be in Plasma::Corona::initializeLayout(QString const&) () from /usr/lib/libplasma.so.3
#9  0x05fa31d6 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#10 0x05fa34da in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#11 0x05fa3733 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#12 0x00b2c263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#13 0x00b2cec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x00b31387 in ?? () from /usr/lib/libQtCore.so.4
#15 0x00b3149c in ?? () from /usr/lib/libQtCore.so.4
#16 0x00b263bf in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#17 0x06aa3f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#18 0x06aab67c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x0105fbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#20 0x00b166cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#21 0x00b437ce in ?? () from /usr/lib/libQtCore.so.4
#22 0x00b410e0 in ?? () from /usr/lib/libQtCore.so.4
#23 0x00c42e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#24 0x00c46730 in ?? () from /lib/libglib-2.0.so.0
#25 0x00c46863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#26 0x00b4102c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0x06b44be5 in ?? () from /usr/lib/libQtGui.so.4
#28 0x00b14c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0x00b150ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x00b1753f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0x06aa3dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#32 0x05f8680d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#33 0x0804dde1 in _start ()

This bug may be a duplicate of or related to bug 225478

Reported using DrKonqi