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 2.6.31-15-generic-pae i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was reading my mail through Kontact/KMail and switch to a new desktop. After that a crash and KDE restarted.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb579e700 (LWP 2226))]

Thread 2 (Thread 0xa8973b70 (LWP 2227)):
#0  0xb77ce430 in __kernel_vsyscall ()
#1  0xb5ef8e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb60bc78d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb75d2e67 in QWaitConditionPrivate::wait (this=0x9637140, mutex=0x963713c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9637140, mutex=0x963713c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0xb5e0a922 in QHostInfoAgent::run (this=0x9637130) at kernel/qhostinfo.cpp:260
#6  0xb75d1e32 in QThreadPrivate::start (arg=0x9637130) at thread/qthread_unix.cpp:188
#7  0xb5ef480e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb60af7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb579e700 (LWP 2226)):
[KCrash Handler]
#6  0xb71f6d57 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0xb63c970e in qt_x11_getX11InfoForWindow (xinfo=0x9facd4c, a=...) at kernel/qwidget_x11.cpp:400
#8  0xb63d0b4e in QWidgetPrivate::create_sys (this=0x9facc58, window=31960494, initializeWindow=true, destroyOldWindow=true) at kernel/qwidget_x11.cpp:545
#9  0xb6391b1c in QWidget::create (this=0xa044ae8, window=31960494, initializeWindow=true, destroyOldWindow=<value optimized out>) at kernel/qwidget.cpp:1253
#10 0xa8c5fc0e in SystemTray::X11EmbedContainer::embedSystemTrayClient (this=0xa044ae8, clientId=71346325) at ../../../../plasma/applets/systemtray/protocols/fdo/x11embedcontainer.cpp:110
#11 0xa8c5b3f0 in SystemTray::FdoGraphicsWidget::setupXEmbedDelegate (this=0x9e8f440) at ../../../../plasma/applets/systemtray/protocols/fdo/fdographicswidget.cpp:159
#12 0xa8c5b4cb in SystemTray::FdoGraphicsWidget::qt_metacall (this=0x9e8f440, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfe24bec) at ./fdographicswidget.moc:78
#13 0xb76d8263 in QMetaObject::activate (sender=0x96102e0, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#14 0xb76d8ec2 in QMetaObject::activate (sender=0x96102e0, m=0xb77b2908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#15 0xb76dd387 in QSingleShotTimer::timeout (this=0x96102e0) at .moc/release-shared/qtimer.moc:76
#16 0xb76dd49c in QSingleShotTimer::timerEvent (this=0x96102e0) at kernel/qtimer.cpp:298
#17 0xb76d23bf in QObject::event (this=0x96102e0, e=0xbfe25080) at kernel/qobject.cpp:1075
#18 0xb633af54 in QApplicationPrivate::notify_helper (this=0x926e0a0, receiver=0x96102e0, e=0xbfe25080) at kernel/qapplication.cpp:4056
#19 0xb634267c in QApplication::notify (this=0x9247190, receiver=0x96102e0, e=0xbfe25080) at kernel/qapplication.cpp:3603
#20 0xb6d8b14a in KApplication::notify (this=0x9247190, receiver=0x96102e0, event=0xbfe25080) at ../../kdeui/kernel/kapplication.cpp:302
#21 0xb76c26cb in QCoreApplication::notifyInternal (this=0x9247190, receiver=0x96102e0, event=0xbfe25080) at kernel/qcoreapplication.cpp:610
#22 0xb76ef7ce in QCoreApplication::sendEvent (this=0x9270c74) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#23 QTimerInfoList::activateTimers (this=0x9270c74) at kernel/qeventdispatcher_unix.cpp:572
#24 0xb76ed0e0 in timerSourceDispatch (source=0x9270c40) at kernel/qeventdispatcher_glib.cpp:165
#25 0xb5f40e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0xb5f44720 in ?? () from /lib/libglib-2.0.so.0
#27 0xb5f44853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0xb76ed02c in QEventDispatcherGlib::processEvents (this=0x926de90, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#29 0xb63dbbe5 in QGuiEventDispatcherGlib::processEvents (this=0x926de90, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#30 0xb76c0c79 in QEventLoop::processEvents (this=0xbfe25344, flags=) at kernel/qeventloop.cpp:149
#31 0xb76c10ca in QEventLoop::exec (this=0xbfe25344, flags=...) at kernel/qeventloop.cpp:201
#32 0xb76c353f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#33 0xb633add7 in QApplication::exec () at kernel/qapplication.cpp:3525
#34 0xb42fc80d in kdemain (argc=1, argv=0x92336e0) at ../../../../plasma/shells/desktop/main.cpp:50
#35 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x9233730 "", 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=0xbfe25ba4, envp=0xbfe25bb0) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi