Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
plasma crashes at startup. it began after updating kde to 4.3.4. Restarting plasma, or kde, or whole system doesn't help. there is just black screen and info about crash.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7797700 (LWP 3033))]

Thread 2 (Thread 0xaba08b70 (LWP 3043)):
#0  0x00ef2422 in __kernel_vsyscall ()
#1  0x005fae15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x01ea778d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x0015fe67 in QWaitConditionPrivate::wait (this=0xa233e90, mutex=0xa233e8c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0xa233e90, mutex=0xa233e8c, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x0190b922 in QHostInfoAgent::run (this=0xa233e80) at kernel/qhostinfo.cpp:260
#6  0x0015ee32 in QThreadPrivate::start (arg=0xa233e80) at thread/qthread_unix.cpp:188
#7  0x005f680e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x01e9a7ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7797700 (LWP 3033)):
[KCrash Handler]
#6  0x01b416ce in Plasma::Applet::flushPendingConstraintsEvents (this=0x9c07ab8) at ../../plasma/applet.cpp:1114
#7  0x01b657fd in Plasma::Corona::loadLayout (this=0x946be10, configName=...) at ../../plasma/corona.cpp:379
#8  0x01b668de in Plasma::Corona::initializeLayout (this=0x946be10, configName=...) at ../../plasma/corona.cpp:324
#9  0x0204b1d6 in PlasmaApp::corona (this=0x939cc20) at ../../../../plasma/shells/desktop/plasmaapp.cpp:574
#10 0x0204b4da in PlasmaApp::setupDesktop (this=0x939cc20) at ../../../../plasma/shells/desktop/plasmaapp.cpp:252
#11 0x0204b733 in PlasmaApp::qt_metacall (this=0x939cc20, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbfcbc00c) at ./plasmaapp.moc:115
#12 0x00265263 in QMetaObject::activate (sender=0x944d1c0, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#13 0x00265ec2 in QMetaObject::activate (sender=0x944d1c0, m=0x33f908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#14 0x0026a387 in QSingleShotTimer::timeout (this=0x944d1c0) at .moc/release-shared/qtimer.moc:76
#15 0x0026a49c in QSingleShotTimer::timerEvent (this=0x944d1c0) at kernel/qtimer.cpp:298
#16 0x0025f3bf in QObject::event (this=0x944d1c0, e=0xbfcbc4a0) at kernel/qobject.cpp:1075
#17 0x01013f54 in QApplicationPrivate::notify_helper (this=0x93c3a78, receiver=0x944d1c0, e=0xbfcbc4a0) at kernel/qapplication.cpp:4056
#18 0x0101b67c in QApplication::notify (this=0x939cc20, receiver=0x944d1c0, e=0xbfcbc4a0) at kernel/qapplication.cpp:3603
#19 0x00cff1aa in KApplication::notify (this=0x939cc20, receiver=0x944d1c0, event=0xbfcbc4a0) at ../../kdeui/kernel/kapplication.cpp:302
#20 0x0024f6cb in QCoreApplication::notifyInternal (this=0x939cc20, receiver=0x944d1c0, event=0xbfcbc4a0) at kernel/qcoreapplication.cpp:610
#21 0x0027c7ce in QCoreApplication::sendEvent (this=0x93c5b34) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#22 QTimerInfoList::activateTimers (this=0x93c5b34) at kernel/qeventdispatcher_unix.cpp:572
#23 0x0027a0e0 in timerSourceDispatch (source=0x93c5b00) at kernel/qeventdispatcher_glib.cpp:165
#24 0x0720fe78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x07213720 in ?? () from /lib/libglib-2.0.so.0
#26 0x07213853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x0027a02c in QEventDispatcherGlib::processEvents (this=0x93c3838, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#28 0x010b4be5 in QGuiEventDispatcherGlib::processEvents (this=0x93c3838, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x0024dc79 in QEventLoop::processEvents (this=0xbfcbc764, flags=) at kernel/qeventloop.cpp:149
#30 0x0024e0ca in QEventLoop::exec (this=0xbfcbc764, flags=...) at kernel/qeventloop.cpp:201
#31 0x0025053f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#32 0x01013dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#33 0x0202e80d in kdemain (argc=1, argv=0x93481e8) 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=0x936b990 "", 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=0xbfcbcfc4, envp=0xbfcbcfd0) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi