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 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
after login the plasma-desktop will crashed after restard the plasma-desktop the screen will be black

 -- Backtrace:
Application: Plasma-Arbeitsfläche (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7898700 (LWP 1685))]

Thread 2 (Thread 0xac085b70 (LWP 1686)):
#0  0x00a61422 in __kernel_vsyscall ()
#1  0x00197e15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0237578d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0x00861e67 in QWaitConditionPrivate::wait (this=0xa4fd3e8, mutex=0xa4fd3e4, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0xa4fd3e8, mutex=0xa4fd3e4, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0x01a99922 in QHostInfoAgent::run (this=0xa4fd3d8) at kernel/qhostinfo.cpp:260
#6  0x00860e32 in QThreadPrivate::start (arg=0xa4fd3d8) at thread/qthread_unix.cpp:188
#7  0x0019380e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x023687ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb7898700 (LWP 1685)):
[KCrash Handler]
#6  0x0133c6ee in Plasma::Applet::flushPendingConstraintsEvents (this=0xa00a470) at ../../plasma/applet.cpp:1109
#7  0x013607dd in Plasma::Corona::loadLayout (this=0x9b5de48, configName=...) at ../../plasma/corona.cpp:379
#8  0x013618be in Plasma::Corona::initializeLayout (this=0x9b5de48, configName=...) at ../../plasma/corona.cpp:324
#9  0x011c91d6 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#10 0x011c94da in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#11 0x011c9733 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#12 0x00967263 in QMetaObject::activate (sender=0x9b3ea30, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#13 0x00967ec2 in QMetaObject::activate (sender=0x9b3ea30, m=0xa41908, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#14 0x0096c387 in QSingleShotTimer::timeout (this=0x9b3ea30) at .moc/release-shared/qtimer.moc:76
#15 0x0096c49c in QSingleShotTimer::timerEvent (this=0x9b3ea30) at kernel/qtimer.cpp:298
#16 0x009613bf in QObject::event (this=0x9b3ea30, e=0xbff3e2e0) at kernel/qobject.cpp:1075
#17 0x02b2bf54 in QApplicationPrivate::notify_helper (this=0x9a80520, receiver=0x9b3ea30, e=0xbff3e2e0) at kernel/qapplication.cpp:4056
#18 0x02b3367c in QApplication::notify (this=0x9a59668, receiver=0x9b3ea30, e=0xbff3e2e0) at kernel/qapplication.cpp:3603
#19 0x00eb8bfa in KApplication::notify (this=0x9a59668, receiver=0x9b3ea30, event=0xbff3e2e0) at ../../kdeui/kernel/kapplication.cpp:302
#20 0x009516cb in QCoreApplication::notifyInternal (this=0x9a59668, receiver=0x9b3ea30, event=0xbff3e2e0) at kernel/qcoreapplication.cpp:610
#21 0x0097e7ce in QCoreApplication::sendEvent (this=0x9a82ccc) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#22 QTimerInfoList::activateTimers (this=0x9a82ccc) at kernel/qeventdispatcher_unix.cpp:572
#23 0x0097c0e0 in timerSourceDispatch (source=0x9a82c98) at kernel/qeventdispatcher_glib.cpp:165
#24 0x00443e88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x00447730 in ?? () from /lib/libglib-2.0.so.0
#26 0x00447863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x0097c02c in QEventDispatcherGlib::processEvents (this=0x9a80310, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#28 0x02bccbe5 in QGuiEventDispatcherGlib::processEvents (this=0x9a80310, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#29 0x0094fc79 in QEventLoop::processEvents (this=0xbff3e5a4, flags=) at kernel/qeventloop.cpp:149
#30 0x009500ca in QEventLoop::exec (this=0xbff3e5a4, flags=...) at kernel/qeventloop.cpp:201
#31 0x0095253f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#32 0x02b2bdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#33 0x011ac80d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#34 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x9a255d0 "", 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=0xbff3ee04, envp=0xbff3ee10) at ../../kinit/kinit.cpp:1793

Reported using DrKonqi