Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Occasionally when start KPackageKit plasma-deskotp crashed. Happens while KPackageKit updating the dependencies.  

 -- Backtrace:
Application: Spazio di lavoro di Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb76f3700 (LWP 1628))]

Thread 2 (Thread 0xac527b70 (LWP 1630)):
#0  0x00978422 in __kernel_vsyscall ()
#1  0x005ebe15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x00d2778d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x006cde67 in QWaitConditionPrivate::wait (this=0x8729568, mutex=0x8729564, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x8729568, mutex=0x8729564, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x053af922 in QHostInfoAgent::run (this=0x8729558) at kernel/qhostinfo.cpp:260
#6  0x006cce32 in QThreadPrivate::start (arg=0x8729558) at thread/qthread_unix.cpp:188
#7  0x005e780e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x00d1a7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb76f3700 (LWP 1628)):
[KCrash Handler]
#6  0x00b46d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x0489a70e in qt_x11_getX11InfoForWindow (xinfo=0x88a9084, a=...) at kernel/qwidget_x11.cpp:400
#8  0x048a1b4e in QWidgetPrivate::create_sys (this=0x88a8f90, window=14888470, initializeWindow=true, destroyOldWindow=true) at kernel/qwidget_x11.cpp:545
#9  0x04862b1c in QWidget::create (this=0x8eb7400, window=14888470, initializeWindow=true, destroyOldWindow=<value optimized out>) at kernel/qwidget.cpp:1253
#10 0x026b0c0e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x026ac3f0 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x026ac4cb in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x007d3263 in QMetaObject::activate (sender=0x8b24bd8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#14 0x007d3ec2 in QMetaObject::activate (sender=0x8b24bd8, m=0x8ad908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#15 0x007d8387 in QSingleShotTimer::timeout (this=0x8b24bd8) at .moc/release-shared/qtimer.moc:76
#16 0x007d849c in QSingleShotTimer::timerEvent (this=0x8b24bd8) at kernel/qtimer.cpp:298
#17 0x007cd3bf in QObject::event (this=0x8b24bd8, e=0xbfd63900) at kernel/qobject.cpp:1075
#18 0x0480bf54 in QApplicationPrivate::notify_helper (this=0x80e79e8, receiver=0x8b24bd8, e=0xbfd63900) at kernel/qapplication.cpp:4056
#19 0x0481367c in QApplication::notify (this=0x80e1bd8, receiver=0x8b24bd8, e=0xbfd63900) at kernel/qapplication.cpp:3603
#20 0x011a014a in KApplication::notify (this=0x80e1bd8, receiver=0x8b24bd8, event=0xbfd63900) at ../../kdeui/kernel/kapplication.cpp:302
#21 0x007bd6cb in QCoreApplication::notifyInternal (this=0x80e1bd8, receiver=0x8b24bd8, event=0xbfd63900) at kernel/qcoreapplication.cpp:610
#22 0x007ea7ce in QCoreApplication::sendEvent (this=0x80ea19c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QTimerInfoList::activateTimers (this=0x80ea19c) at kernel/qeventdispatcher_unix.cpp:572
#24 0x007e80e0 in timerSourceDispatch (source=0x80ea168) at kernel/qeventdispatcher_glib.cpp:165
#25 0x008e9e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0x008ed720 in ?? () from /lib/libglib-2.0.so.0
#27 0x008ed853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0x007e802c in QEventDispatcherGlib::processEvents (this=0x80e77d8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#29 0x048acbe5 in QGuiEventDispatcherGlib::processEvents (this=0x80e77d8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#30 0x007bbc79 in QEventLoop::processEvents (this=0xbfd63bc4, flags=) at kernel/qeventloop.cpp:149
#31 0x007bc0ca in QEventLoop::exec (this=0xbfd63bc4, flags=...) at kernel/qeventloop.cpp:201
#32 0x007be53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0x0480bdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0x078d780d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#35 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x8086e00 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#36 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#37 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#38 0x0804fbaf in main (argc=2, argv=0xbfd64424, envp=0xbfd64430) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi