Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
apparently this bug has been already reported 

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7761700 (LWP 1741))]

Thread 2 (Thread 0xaba55b70 (LWP 1742)):
#0  0x00239422 in __kernel_vsyscall ()
#1  0x005a5e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x062fc87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00289e67 in QWaitConditionPrivate::wait (this=0x9d77cc0, mutex=0x9d77cbc, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x9d77cc0, mutex=0x9d77cbc, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x04f5c922 in QHostInfoAgent::run (this=0x9d77cb0) at kernel/qhostinfo.cpp:260
#6  0x00288e32 in QThreadPrivate::start (arg=0x9d77cb0) at thread/qthread_unix.cpp:188
#7  0x005a180e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x062ef8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7761700 (LWP 1741)):
[KCrash Handler]
#6  0x012fe6ce in Plasma::Applet::flushPendingConstraintsEvents (this=0x9d690d8) at ../../plasma/applet.cpp:1114
#7  0x013227fd in Plasma::Corona::loadLayout (this=0x95310d8, configName=...) at ../../plasma/corona.cpp:379
#8  0x013238de in Plasma::Corona::initializeLayout (this=0x95310d8, configName=...) at ../../plasma/corona.cpp:324
#9  0x014b83b6 in PlasmaApp::corona (this=0x9504d80) at ../../../../plasma/shells/desktop/plasmaapp.cpp:574
#10 0x014b86ba in PlasmaApp::setupDesktop (this=0x9504d80) at ../../../../plasma/shells/desktop/plasmaapp.cpp:252
#11 0x014b8913 in PlasmaApp::qt_metacall (this=0x9504d80, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbfec3e0c) at ./plasmaapp.moc:115
#12 0x0038f263 in QMetaObject::activate (sender=0x95ef3d0, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#13 0x0038fec2 in QMetaObject::activate (sender=0x95ef3d0, m=0x469908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#14 0x00394387 in QSingleShotTimer::timeout (this=0x95ef3d0) at .moc/release-shared/qtimer.moc:76
#15 0x0039449c in QSingleShotTimer::timerEvent (this=0x95ef3d0) at kernel/qtimer.cpp:298
#16 0x003893bf in QObject::event (this=0x95ef3d0, e=0xbfec42a0) at kernel/qobject.cpp:1075
#17 0x033d8f54 in QApplicationPrivate::notify_helper (this=0x952bbe0, receiver=0x95ef3d0, e=0xbfec42a0) at kernel/qapplication.cpp:4056
#18 0x033e067c in QApplication::notify (this=0x9504d80, receiver=0x95ef3d0, e=0xbfec42a0) at kernel/qapplication.cpp:3603
#19 0x00ff325a in KApplication::notify (this=0x9504d80, receiver=0x95ef3d0, event=0xbfec42a0) at ../../kdeui/kernel/kapplication.cpp:302
#20 0x003796cb in QCoreApplication::notifyInternal (this=0x9504d80, receiver=0x95ef3d0, event=0xbfec42a0) at kernel/qcoreapplication.cpp:610
#21 0x003a67ce in QCoreApplication::sendEvent (this=0x952e38c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#22 QTimerInfoList::activateTimers (this=0x952e38c) at kernel/qeventdispatcher_unix.cpp:572
#23 0x003a40e0 in timerSourceDispatch (source=0x952e358) at kernel/qeventdispatcher_glib.cpp:165
#24 0x00919e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x0091d730 in ?? () from /lib/libglib-2.0.so.0
#26 0x0091d863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x003a402c in QEventDispatcherGlib::processEvents (this=0x952b9d0, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#28 0x03479be5 in QGuiEventDispatcherGlib::processEvents (this=0x952b9d0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x00377c79 in QEventLoop::processEvents (this=0xbfec4564, flags=) at kernel/qeventloop.cpp:149
#30 0x003780ca in QEventLoop::exec (this=0xbfec4564, flags=...) at kernel/qeventloop.cpp:201
#31 0x0037a53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#32 0x033d8dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#33 0x0149b8ad in kdemain (argc=1, argv=0x94ee118) at ../../../../plasma/shells/desktop/main.cpp:50
#34 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x94cec58 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#35 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#36 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#37 0x0804fbaf in main (argc=2, argv=0xbfec4dc4, envp=0xbfec4dd0) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi