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 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I locked the screen just before having dinner without any problem. When I came back I unlocked the screen without any problem and I found the bugzilla popup saying plasma had crashed. I had no problems after that either.

I tried to install debug packages to improve report quality but I had no idea what packages were neeeded and the tutorial at http://techbase.kde.org/Development/Tutorials/Debugging/How_to_create_useful_crash_reports#Preparing_your_KDE_packages hadn't helped me. After a few tries I gave up and didn't installed anything

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb78ca700 (LWP 1557))]

Thread 2 (Thread 0xabb68b70 (LWP 1558)):
#0  0x00bae422 in __kernel_vsyscall ()
#1  0x00371e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0070978d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0044ce67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x063ea922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x0044be32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0036d80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x006fc7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb78ca700 (LWP 1557)):
[KCrash Handler]
#6  0x00137d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x0375c70e in ?? () from /usr/lib/libQtGui.so.4
#8  0x03763b4e in QWidgetPrivate::create_sys(unsigned long, bool, bool) () from /usr/lib/libQtGui.so.4
#9  0x03724b1c in QWidget::create(unsigned long, bool, bool) () from /usr/lib/libQtGui.so.4
#10 0x01845c1e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x018413f0 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x018414cb in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x00552263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x00552ec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x00557387 in ?? () from /usr/lib/libQtCore.so.4
#16 0x0055749c in ?? () from /usr/lib/libQtCore.so.4
#17 0x0054c3bf in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#18 0x036cdf54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x036d567c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x01005bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#21 0x0053c6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#22 0x005697ce in ?? () from /usr/lib/libQtCore.so.4
#23 0x005670e0 in ?? () from /usr/lib/libQtCore.so.4
#24 0x05633e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x05637720 in ?? () from /lib/libglib-2.0.so.0
#26 0x05637853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x0056702c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#28 0x0376ebe5 in ?? () from /usr/lib/libQtGui.so.4
#29 0x0053ac79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x0053b0ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#31 0x0053d53f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#32 0x036cddd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#33 0x014ef80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#34 0x0804dde1 in _start ()

This bug may be a duplicate of or related to bug 216949

Reported using DrKonqi