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 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was looking for packages in KPackageKit and at the same time with the Firefox browser open. Suddenly the panel KPackage was in full screen, and the bottom bar of KDE disappeared for a few seconds, usually returning a few seconds.

 -- Backtrace:
Application: Espaço de trabalho do Plasma (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb774f700 (LWP 1572))]

Thread 2 (Thread 0xac44eb70 (LWP 1574)):
#0  0x00f0e422 in __kernel_vsyscall ()
#1  0x0049fe15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0086678d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0015fe67 in QWaitConditionPrivate::wait (this=0x9938820, mutex=0x993881c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9938820, mutex=0x993881c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x081de922 in QHostInfoAgent::run (this=0x9938810) at kernel/qhostinfo.cpp:260
#6  0x0015ee32 in QThreadPrivate::start (arg=0x9938810) at thread/qthread_unix.cpp:188
#7  0x0049b80e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x008597ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb774f700 (LWP 1572)):
[KCrash Handler]
#6  0x00997d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x0431270e in qt_x11_getX11InfoForWindow (xinfo=0x9b42d7c, a=...) at kernel/qwidget_x11.cpp:400
#8  0x04319b4e in QWidgetPrivate::create_sys (this=0x9b42c88, window=29517005, initializeWindow=true, destroyOldWindow=true) at kernel/qwidget_x11.cpp:545
#9  0x042dab1c in QWidget::create (this=0xa0d4050, window=29517005, initializeWindow=true, destroyOldWindow=<value optimized out>) at kernel/qwidget.cpp:1253
#10 0x025a2c1e in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x0259e3f0 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x0259e4cb in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x00265263 in QMetaObject::activate (sender=0x963b888, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#14 0x00265ec2 in QMetaObject::activate (sender=0x963b888, m=0x33f908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#15 0x0026a387 in QSingleShotTimer::timeout (this=0x963b888) at .moc/release-shared/qtimer.moc:76
#16 0x0026a49c in QSingleShotTimer::timerEvent (this=0x963b888) at kernel/qtimer.cpp:298
#17 0x0025f3bf in QObject::event (this=0x963b888, e=0xbfb7a2f0) at kernel/qobject.cpp:1075
#18 0x04283f54 in QApplicationPrivate::notify_helper (this=0x93a9188, receiver=0x963b888, e=0xbfb7a2f0) at kernel/qapplication.cpp:4056
#19 0x0428b67c in QApplication::notify (this=0x9375e80, receiver=0x963b888, e=0xbfb7a2f0) at kernel/qapplication.cpp:3603
#20 0x010e1bfa in KApplication::notify (this=0x9375e80, receiver=0x963b888, event=0xbfb7a2f0) at ../../kdeui/kernel/kapplication.cpp:302
#21 0x0024f6cb in QCoreApplication::notifyInternal (this=0x9375e80, receiver=0x963b888, event=0xbfb7a2f0) at kernel/qcoreapplication.cpp:610
#22 0x0027c7ce in QCoreApplication::sendEvent (this=0x93abb7c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QTimerInfoList::activateTimers (this=0x93abb7c) at kernel/qeventdispatcher_unix.cpp:572
#24 0x0027a0e0 in timerSourceDispatch (source=0x93abb48) at kernel/qeventdispatcher_glib.cpp:165
#25 0x00e04e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0x00e08720 in ?? () from /lib/libglib-2.0.so.0
#27 0x00e08853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0x0027a02c in QEventDispatcherGlib::processEvents (this=0x93a8ce0, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#29 0x04324be5 in QGuiEventDispatcherGlib::processEvents (this=0x93a8ce0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#30 0x0024dc79 in QEventLoop::processEvents (this=0xbfb7a5b4, flags=) at kernel/qeventloop.cpp:149
#31 0x0024e0ca in QEventLoop::exec (this=0xbfb7a5b4, flags=...) at kernel/qeventloop.cpp:201
#32 0x0025053f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0x04283dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0x0663780d 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=0x936ebc0 "", 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=0xbfb7ae14, envp=0xbfb7ae20) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 213203

Reported using DrKonqi