Application: plasma-desktop (0.4)
KDE Platform Version: 4.5.90 (4.6 RC1)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-24-generic x86_64
Distribution: Ubuntu 10.10

-- Information about the crash:
Suddenly after login on kde, while loading the kde default apps, the plasma-desktop crashes.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f0061d8f7a0 (LWP 2098))]

Thread 4 (Thread 0x7f00423aa700 (LWP 2102)):
#0  __pthread_mutex_unlock_usercnt (mutex=0x1872928) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x1872928) at pthread_mutex_unlock.c:290
#2  0x00007f0056443661 in g_main_context_check () from /lib/libglib-2.0.so.0
#3  0x00007f0056444023 in ?? () from /lib/libglib-2.0.so.0
#4  0x00007f005644445c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#5  0x00007f005ea151e6 in QEventDispatcherGlib::processEvents (this=0x186cc20, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:417
#6  0x00007f005e9e7a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#7  0x00007f005e9e7dec in QEventLoop::exec (this=0x7f00423a9cb0, flags=) at kernel/qeventloop.cpp:201
#8  0x00007f005e8f22fd in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:490
#9  0x00007f005e9c75f8 in QInotifyFileSystemWatcherEngine::run (this=0x195fe30) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f005e8f527e in QThreadPrivate::start (arg=0x195fe30) at thread/qthread_unix.cpp:266
#11 0x00007f0059c74ae3 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#12 0x00007f0056af6971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#13 0x00007f006169b92d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f0041ba9700 (LWP 2103)):
#0  0x00007f006168f203 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f0056444009 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f005644445c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007f005ea151e6 in QEventDispatcherGlib::processEvents (this=0x18e4d10, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:417
#4  0x00007f005e9e7a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007f005e9e7dec in QEventLoop::exec (this=0x7f0041ba8cd0, flags=) at kernel/qeventloop.cpp:201
#6  0x00007f005e8f22fd in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:490
#7  0x00007f0054d33b6c in Herqq::Upnp::HControlPointThread::run() () from /usr/lib/libHUpnp.so.0
#8  0x00007f005e8f527e in QThreadPrivate::start (arg=0x18e43d0) at thread/qthread_unix.cpp:266
#9  0x00007f0059c74ae3 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f0056af6971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#11 0x00007f006169b92d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f00377da700 (LWP 2107)):
#0  0x00007f006168f203 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f0056444009 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f005644445c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007f005ea151e6 in QEventDispatcherGlib::processEvents (this=0x19cd4f0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:417
#4  0x00007f005e9e7a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007f005e9e7dec in QEventLoop::exec (this=0x7f00377d9cb0, flags=) at kernel/qeventloop.cpp:201
#6  0x00007f005e8f22fd in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:490
#7  0x00007f005e9c75f8 in QInotifyFileSystemWatcherEngine::run (this=0x1b54350) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f005e8f527e in QThreadPrivate::start (arg=0x1b54350) at thread/qthread_unix.cpp:266
#9  0x00007f0059c74ae3 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f0056af6971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#11 0x00007f006169b92d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f0061d8f7a0 (LWP 2098)):
[KCrash Handler]
#6  0x00007f005e3876a4 in QGraphicsLayoutItem::isLayout (this=0x27d7c50) at graphicsview/qgraphicslayoutitem.cpp:804
#7  0x00007f005e386742 in QGraphicsLayoutPrivate::activateRecursive (this=0x188ff30, item=0x27d7c50) at graphicsview/qgraphicslayout_p.cpp:181
#8  0x00007f005e386780 in QGraphicsLayoutPrivate::activateRecursive (this=0x188ff30, item=0x17f9840) at graphicsview/qgraphicslayout_p.cpp:189
#9  0x00007f005e386103 in QGraphicsLayout::activate (this=0x17f9840) at graphicsview/qgraphicslayout.cpp:261
#10 0x00007f005e3861c1 in QGraphicsLayout::widgetEvent (this=0x17f9840, e=0x27d7c50) at graphicsview/qgraphicslayout.cpp:369
#11 0x00007f005e3cb10f in QGraphicsWidget::event (this=0x188fb70, event=0x27de7b0) at graphicsview/qgraphicswidget.cpp:1329
#12 0x00007f005dd4ffdc in QApplicationPrivate::notify_helper (this=0x11fadb0, receiver=0x188fb70, e=0x27de7b0) at kernel/qapplication.cpp:4396
#13 0x00007f005dd55aed in QApplication::notify (this=0x11e5d50, receiver=0x188fb70, e=0x27de7b0) at kernel/qapplication.cpp:4277
#14 0x00007f005f6eb086 in KApplication::notify (this=0x11e5d50, receiver=0x188fb70, event=0x27de7b0) at ../../kdeui/kernel/kapplication.cpp:311
#15 0x00007f005e9e8cdc in QCoreApplication::notifyInternal (this=0x11e5d50, receiver=0x188fb70, event=0x27de7b0) at kernel/qcoreapplication.cpp:732
#16 0x00007f005e9ebc22 in sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x115eba0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x115eba0) at kernel/qcoreapplication.cpp:1373
#18 0x00007f005ea15653 in sendPostedEvents (s=0x11fe5f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#19 postEventSourceDispatch (s=0x11fe5f0) at kernel/qeventdispatcher_glib.cpp:277
#20 0x00007f0056440342 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#21 0x00007f00564442a8 in ?? () from /lib/libglib-2.0.so.0
#22 0x00007f005644445c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#23 0x00007f005ea15193 in QEventDispatcherGlib::processEvents (this=0x115e250, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#24 0x00007f005de02a4e in QGuiEventDispatcherGlib::processEvents (this=0x27d7c50, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#25 0x00007f005e9e7a02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#26 0x00007f005e9e7dec in QEventLoop::exec (this=0x7fff1b015bb0, flags=) at kernel/qeventloop.cpp:201
#27 0x00007f005e9ebebb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#28 0x00007f0061979c83 in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../../../plasma/desktop/shell/main.cpp:118
#29 0x00007f00615d3d8e in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff1b015f88) at libc-start.c:226
#30 0x0000000000400669 in _start ()

Reported using DrKonqi