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 2.6.31-22-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I don't know what was going on, I just was reusing the PC after one night of inactivity and I saw a crash of plasma. I was doing nothing particular : using Quassel irc, eclipse, firefox, and konqueror

 -- Backtrace:
Application: Espace de travail Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7785ac0 (LWP 2014))]

Thread 2 (Thread 0xac558b70 (LWP 2017)):
#0  0x00420422 in __kernel_vsyscall ()
#1  0x00385e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x004fa9ad in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0069fe67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x00c2c922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x0069ee32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0038180e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0x004eda0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7785ac0 (LWP 2014)):
[KCrash Handler]
#6  0x00173d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x0726370e in ?? () from /usr/lib/libQtGui.so.4
#8  0x0726ab4e in QWidgetPrivate::create_sys(unsigned long, bool, bool) () from /usr/lib/libQtGui.so.4
#9  0x0722bb1c in QWidget::create(unsigned long, bool, bool) () from /usr/lib/libQtGui.so.4
#10 0x02f37c1e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x02f333f0 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x02f334cb in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x007a5263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x007a5ec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x007aa387 in ?? () from /usr/lib/libQtCore.so.4
#16 0x007aa49c in ?? () from /usr/lib/libQtCore.so.4
#17 0x0079f3bf in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#18 0x071d4f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x071dc67c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x011cfbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#21 0x0078f6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#22 0x007bc7ce in ?? () from /usr/lib/libQtCore.so.4
#23 0x007ba0e0 in ?? () from /usr/lib/libQtCore.so.4
#24 0x005a0e75 in g_main_dispatch (context=0x96d5c90) at gmain.c:1960
#25 IA__g_main_context_dispatch (context=0x96d5c90) at gmain.c:2513
#26 0x005a4ba0 in g_main_context_iterate (context=0x96d5c90, block=<value optimized out>, dispatch=1, self=0x96d3700) at gmain.c:2591
#27 0x005a4d38 in IA__g_main_context_iteration (context=0x96d5c90, may_block=1) at gmain.c:2654
#28 0x007ba02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0x07275be5 in ?? () from /usr/lib/libQtGui.so.4
#30 0x0078dc79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#31 0x0078e0ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#32 0x0079053f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#33 0x071d4dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#34 0x04b8880d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#35 0x0804dde1 in _start ()

Reported using DrKonqi