Application: plasma-desktop (4.10.4)
KDE Platform Version: 4.10.4
Qt Version: 4.8.4
Operating System: Linux 3.9-1-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

-- Information about the crash:
After logging in, I get the crash handling dialog. The following things happened: 
* No taskbar and no desktop background
* kwin (menu bar, switching windows etc) works 

It does not happen on every login -  doing a reboot or restarting kdm does not make a distinguished difference.

Thanks.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa07b76e780 (LWP 4885))]

Thread 6 (Thread 0x7fa05a7e1700 (LWP 4886)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa074c45357 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007fa074c45389 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007fa06f35ae0e in start_thread (arg=0x7fa05a7e1700) at pthread_create.c:311
#4  0x00007fa07b06195d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7f9fd5826700 (LWP 4889)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007fa077abf027 in wait (time=30000, this=0x1cd0f50) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1cd0ef8, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fa077ab25cf in QThreadPoolThread::run (this=0x1cd1030) at concurrent/qthreadpool.cpp:141
#4  0x00007fa077abeb6c in QThreadPrivate::start (arg=0x1cd1030) at thread/qthread_unix.cpp:338
#5  0x00007fa06f35ae0e in start_thread (arg=0x7f9fd5826700) at pthread_create.c:311
#6  0x00007fa07b06195d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7f9fcaf86700 (LWP 4890)):
#0  0x00007fa06ea1cdd0 in pthread_mutex_lock@plt () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fa06ea89f01 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa06ea49f30 in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa06ea4aca5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa06ea4aeec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa077be9d06 in QEventDispatcherGlib::processEvents (this=0x7f9fbc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fa077bba0ff in QEventLoop::processEvents (this=this@entry=0x7f9fcaf85dd0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fa077bba388 in QEventLoop::exec (this=this@entry=0x7f9fcaf85dd0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fa077abc390 in QThread::exec (this=this@entry=0x23de0c0) at thread/qthread.cpp:542
#9  0x00007fa077b9bc6f in QInotifyFileSystemWatcherEngine::run (this=0x23de0c0) at io/qfilesystemwatcher_inotify.cpp:256
#10 0x00007fa077abeb6c in QThreadPrivate::start (arg=0x23de0c0) at thread/qthread_unix.cpp:338
#11 0x00007fa06f35ae0e in start_thread (arg=0x7f9fcaf86700) at pthread_create.c:311
#12 0x00007fa07b06195d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f9fb4864700 (LWP 4891)):
#0  0x00007fa07b0561bd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fa06ea4ade4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa06ea4aeec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa077be9d06 in QEventDispatcherGlib::processEvents (this=0x7f9fb00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fa077bba0ff in QEventLoop::processEvents (this=this@entry=0x7f9fb4863dc0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fa077bba388 in QEventLoop::exec (this=this@entry=0x7f9fb4863dc0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fa077abc390 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#7  0x00007f9fb5c4d565 in KCupsConnection::run() () from /usr/lib/libkcupslib.so
#8  0x00007fa077abeb6c in QThreadPrivate::start (arg=0x33e05a0) at thread/qthread_unix.cpp:338
#9  0x00007fa06f35ae0e in start_thread (arg=0x7f9fb4864700) at pthread_create.c:311
#10 0x00007fa07b06195d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f9fadd4c700 (LWP 4919)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007fa077abf027 in wait (time=30000, this=0x1cd0f50) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1cd0ef8, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fa077ab25cf in QThreadPoolThread::run (this=0x43eab30) at concurrent/qthreadpool.cpp:141
#4  0x00007fa077abeb6c in QThreadPrivate::start (arg=0x43eab30) at thread/qthread_unix.cpp:338
#5  0x00007fa06f35ae0e in start_thread (arg=0x7f9fadd4c700) at pthread_create.c:311
#6  0x00007fa07b06195d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fa07b76e780 (LWP 4885)):
[KCrash Handler]
#6  0x00007fa077bd3148 in QObject::connect (sender=0x7f9fae6febc8, signal=0x7fa07047c6d0 "2authenticationRequired(QNetworkReply*,QAuthenticator*)", receiver=0x534cf50, method=0x7fa07047c680 "1authenticate(QNetworkReply*,QAuthenticator*)", type=Qt::AutoConnection) at kernel/qobject.cpp:2550
#7  0x00007fa070471d70 in Attica::ProviderManager::ProviderManager() () from /usr/lib/libattica.so.0
#8  0x00007fa078d20151 in KNS3::AtticaProvider::AtticaProvider (this=0x534cf20, categories=...) at ../../../knewstuff/knewstuff3/attica/atticaprovider.cpp:40
#9  0x00007fa078d001a9 in KNS3::Engine::slotProviderFileLoaded (this=0x25440e0, doc=...) at ../../../knewstuff/knewstuff3/core/engine.cpp:209
#10 0x00007fa078d00c51 in qt_static_metacall (_a=<optimized out>, _id=<optimized out>, _o=<optimized out>, _c=<optimized out>) at ./engine.moc:125
#11 KNS3::Engine::qt_static_metacall (_o=0x25440e0, _c=1883752144, _id=2009700246, _a=0x7fa077c9978e) at ./engine.moc:103
#12 0x00007fa077bcfdcf in QMetaObject::activate (sender=sender@entry=0x23899a0, m=m@entry=0x7fa078f43b20 <KNS3::XmlLoader::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff50825f70) at kernel/qobject.cpp:3539
#13 0x00007fa078d10ef2 in KNS3::XmlLoader::signalLoaded (this=this@entry=0x23899a0, _t1=...) at ./xmlloader.moc:111
#14 0x00007fa078d10f8b in KNS3::XmlLoader::slotJobResult (this=0x23899a0, job=<optimized out>) at ../../../knewstuff/knewstuff3/core/xmlloader.cpp:77
#15 0x00007fa077bcfdcf in QMetaObject::activate (sender=sender@entry=0xc7c160, m=m@entry=0x7fa078655600 <KJob::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fff508260e0) at kernel/qobject.cpp:3539
#16 0x00007fa0782c9722 in KJob::result (this=this@entry=0xc7c160, _t1=_t1@entry=0xc7c160) at ./kjob.moc:208
#17 0x00007fa0782c9760 in KJob::emitResult (this=this@entry=0xc7c160) at ../../kdecore/jobs/kjob.cpp:318
#18 0x00007fa07a6c8635 in KIO::SimpleJob::slotFinished (this=this@entry=0xc7c160) at ../../kio/kio/job.cpp:494
#19 0x00007fa07a6c8ad2 in KIO::TransferJob::slotFinished (this=0xc7c160) at ../../kio/kio/job.cpp:1081
#20 0x00007fa077bcfdcf in QMetaObject::activate (sender=sender@entry=0x352bf70, m=m@entry=0x7fa07aa64660 <KIO::SlaveInterface::staticMetaObject>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#21 0x00007fa07a7609f3 in KIO::SlaveInterface::finished (this=this@entry=0x352bf70) at ./slaveinterface.moc:185
#22 0x00007fa07a7636f1 in KIO::SlaveInterface::dispatch (this=0x352bf70, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:172
#23 0x00007fa07a76082a in KIO::SlaveInterface::dispatch (this=0x352bf70) at ../../kio/kio/slaveinterface.cpp:88
#24 0x00007fa07a754dbe in KIO::Slave::gotInput (this=0x352bf70) at ../../kio/kio/slave.cpp:344
#25 0x00007fa077bcfdcf in QMetaObject::activate (sender=0x352daa0, m=m@entry=0x7fa07aa5db80 <KIO::Connection::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#26 0x00007fa07a694180 in KIO::Connection::readyRead (this=<optimized out>) at ./connection.moc:106
#27 0x00007fa07a694672 in dequeue (this=<optimized out>) at ../../kio/kio/connection.cpp:82
#28 KIO::ConnectionPrivate::dequeue (this=0x10b8a20) at ../../kio/kio/connection.cpp:71
#29 0x00007fa077bd529e in QObject::event (this=0x352daa0, e=<optimized out>) at kernel/qobject.cpp:1194
#30 0x00007fa076f690ec in QApplicationPrivate::notify_helper (this=this@entry=0x70db20, receiver=receiver@entry=0x352daa0, e=e@entry=0x52c5c60) at kernel/qapplication.cpp:4567
#31 0x00007fa076f6ba5b in QApplication::notify (this=this@entry=0x702c60, receiver=receiver@entry=0x352daa0, e=e@entry=0x52c5c60) at kernel/qapplication.cpp:4428
#32 0x00007fa0788b25e6 in KApplication::notify (this=0x702c60, receiver=0x352daa0, event=0x52c5c60) at ../../kdeui/kernel/kapplication.cpp:311
#33 0x00007fa077bbb3ae in QCoreApplication::notifyInternal (this=0x702c60, receiver=receiver@entry=0x352daa0, event=event@entry=0x52c5c60) at kernel/qcoreapplication.cpp:946
#34 0x00007fa077bbeee1 in sendEvent (event=0x52c5c60, receiver=0x352daa0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#35 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x6781f0) at kernel/qcoreapplication.cpp:1570
#36 0x00007fa077bbf213 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1463
#37 0x00007fa077be9b53 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#38 postEventSourceDispatch (s=0x711690) at kernel/qeventdispatcher_glib.cpp:279
#39 0x00007fa06ea4aaf6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#40 0x00007fa06ea4ae48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007fa06ea4aeec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007fa077be9ce6 in QEventDispatcherGlib::processEvents (this=0x679ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#43 0x00007fa07700af9e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#44 0x00007fa077bba0ff in QEventLoop::processEvents (this=this@entry=0x7fff50827150, flags=...) at kernel/qeventloop.cpp:149
#45 0x00007fa077bba388 in QEventLoop::exec (this=this@entry=0x7fff50827150, flags=...) at kernel/qeventloop.cpp:204
#46 0x00007fa077bbfa66 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#47 0x00007fa07b3634b1 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#48 0x00007fa07af9aa55 in __libc_start_main (main=0x4006e0, argc=1, ubp_av=0x7fff50827448, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff50827438) at libc-start.c:260
#49 0x0000000000400711 in _start ()

Possible duplicates by query: bug 321435, bug 306810.

Reported using DrKonqi