Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.90 (4.8.90) (Compiled from sources)
Qt Version: 4.8.2
Operating System: Linux 3.3.3-gentoo x86_64
Distribution: "Gentoo Base System release 2.1"

-- Information about the crash:
- What I was doing when the application crashed: plasma-desktop craches at session startup and when reloading it throuhg plasma-desktop command in Yakauke. 
I'even removed some plasma-widgets such as Veromix but it didn't helped.

The crash can be reproduced every time.

-- Backtrace:
Application: Outil de gestion de fenêtres Plasma (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f588c8d2780 (LWP 5047))]

Thread 3 (Thread 0x7f5866763700 (LWP 5053)):
#0  g_mutex_get_impl (mutex=0x7f58600009a0) at gthread-posix.c:130
#1  0x00007f587f9ec589 in g_mutex_lock (mutex=<optimized out>) at gthread-posix.c:208
#2  0x00007f587f9b0624 in g_main_context_query (context=0x7f58600009a0, max_priority=2147483647, timeout=0x7f5866762cac, fds=0x7f5860002bb0, n_fds=2) at gmain.c:2905
#3  0x00007f587f9b0cea in g_main_context_iterate (dispatch=1, block=1, context=0x7f58600009a0, self=<optimized out>) at gmain.c:3128
#4  g_main_context_iterate (context=0x7f58600009a0, block=1, dispatch=1, self=<optimized out>) at gmain.c:3083
#5  0x00007f587f9b0e8c in g_main_context_iteration (context=0x7f58600009a0, may_block=1) at gmain.c:3207
#6  0x00007f5888d94e2e in QEventDispatcherGlib::processEvents (this=0x7f58600008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#7  0x00007f5888d64652 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007f5888d648d7 in QEventLoop::exec (this=0x7f5866762dd0, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007f5888c62bbf in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#10 0x00007f5888d4425f in QInotifyFileSystemWatcherEngine::run (this=0x100f940) at io/qfilesystemwatcher_inotify.cpp:248
#11 0x00007f5888c65bfb in QThreadPrivate::start (arg=0x100f940) at thread/qthread_unix.cpp:307
#12 0x00007f58889cf006 in start_thread (arg=0x7f5866763700) at pthread_create.c:305
#13 0x00007f588c1f15cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 2 (Thread 0x7f585dd0c700 (LWP 5056)):
#0  pthread_cond_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f5885ad6a2a in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f5885dd7e80) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f5885ad6a69 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f58889cf006 in start_thread (arg=0x7f585dd0c700) at pthread_create.c:305
#4  0x00007f588c1f15cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 1 (Thread 0x7f588c8d2780 (LWP 5047)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007f5888d6c039 in QMetaObject::cast (this=0x7f588c0ef6e0, obj=0x194ca50) at kernel/qmetaobject.cpp:274
#8  0x00007f588bd3e185 in qobject_cast<Plasma::Extender*> (object=<optimized out>) at /usr/include/qt4/QtCore/qobject.h:380
#9  Plasma::PopupAppletPrivate::checkExtenderAppearance (this=0xd94dc0, f=Plasma::Planar) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/popupapplet.cpp:190
#10 0x00007f588bd3ff83 in Plasma::PopupAppletPrivate::popupConstraintsEvent (this=0xd94dc0, constraints=...) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/popupapplet.cpp:211
#11 0x00007f588bceb199 in Plasma::Applet::flushPendingConstraintsEvents (this=0xd96440) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/applet.cpp:1361
#12 0x00007f588bcf9e3a in Plasma::ContainmentPrivate::initApplets (this=0xdbe5c0) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/containment.cpp:470
#13 0x00007f588bd0dce4 in Plasma::CoronaPrivate::importLayout (this=0x6cb4d0, conf=..., mergeConfig=mergeConfig@entry=false) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/corona.cpp:1067
#14 0x00007f588bd0e637 in Plasma::Corona::loadLayout (this=this@entry=0x86a480, configName=...) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/corona.cpp:278
#15 0x00007f588bd0e700 in Plasma::Corona::initializeLayout (this=0x86a480, configName=...) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/plasma/corona.cpp:181
#16 0x00007f588c5086cc in PlasmaApp::corona (this=this@entry=0x69c950, createIfMissing=createIfMissing@entry=true) at /var/tmp/portage/kde-base/plasma-workspace-4.8.90/work/plasma-workspace-4.8.90/plasma/desktop/shell/plasmaapp.cpp:850
#17 0x00007f588c508a1d in PlasmaApp::setupDesktop (this=0x69c950) at /var/tmp/portage/kde-base/plasma-workspace-4.8.90/work/plasma-workspace-4.8.90/plasma/desktop/shell/plasmaapp.cpp:312
#18 0x00007f588c509f0a in qt_static_metacall (_a=<optimized out>, _id=<optimized out>, _o=<optimized out>, _c=<optimized out>) at /var/tmp/portage/kde-base/plasma-workspace-4.8.90/work/plasma-workspace-4.8.90_build/plasma/desktop/shell/plasmaapp.moc:125
#19 PlasmaApp::qt_static_metacall (_o=0x69c950, _c=26528336, _id=-433269247, _a=0x0) at /var/tmp/portage/kde-base/plasma-workspace-4.8.90/work/plasma-workspace-4.8.90_build/plasma/desktop/shell/plasmaapp.moc:101
#20 0x00007f5888d7ed7e in QObject::event (this=0x69c950, e=<optimized out>) at kernel/qobject.cpp:1195
#21 0x00007f5887ec4243 in QApplication::event (this=0x69c950, e=0x79ec90) at kernel/qapplication.cpp:2533
#22 0x00007f5887ec0474 in notify_helper (e=0x79ec90, receiver=0x69c950, this=0x6ae500) at kernel/qapplication.cpp:4551
#23 QApplicationPrivate::notify_helper (this=0x6ae500, receiver=0x69c950, e=0x79ec90) at kernel/qapplication.cpp:4523
#24 0x00007f5887ec51d3 in QApplication::notify (this=0x69c950, receiver=0x69c950, e=0x79ec90) at kernel/qapplication.cpp:4412
#25 0x00007f5889a78da8 in KApplication::notify (this=0x69c950, receiver=0x69c950, event=0x79ec90) at /var/tmp/portage/kde-base/kdelibs-4.8.90/work/kdelibs-4.8.90/kdeui/kernel/kapplication.cpp:311
#26 0x00007f5888d65bab in QCoreApplication::notifyInternal (this=0x69c950, receiver=0x69c950, event=0x79ec90) at kernel/qcoreapplication.cpp:915
#27 0x00007f5888d694c9 in sendEvent (event=0x79ec90, receiver=0x69c950) at kernel/qcoreapplication.h:231
#28 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x6021f0) at kernel/qcoreapplication.cpp:1539
#29 0x00007f5888d949f3 in sendPostedEvents () at kernel/qcoreapplication.h:236
#30 postEventSourceDispatch (s=0x69d710) at kernel/qeventdispatcher_glib.cpp:279
#31 0x00007f587f9b0a92 in g_main_dispatch (context=0x6c3f40) at gmain.c:2539
#32 g_main_context_dispatch (context=0x6c3f40) at gmain.c:3075
#33 0x00007f587f9b0dd5 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x6c3f40, self=<optimized out>) at gmain.c:3146
#34 g_main_context_iterate (context=0x6c3f40, block=<optimized out>, dispatch=1, self=<optimized out>) at gmain.c:3083
#35 0x00007f587f9b0e8c in g_main_context_iteration (context=0x6c3f40, may_block=1) at gmain.c:3207
#36 0x00007f5888d94dd6 in QEventDispatcherGlib::processEvents (this=0x603ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#37 0x00007f5887f642c6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#38 0x00007f5888d64652 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#39 0x00007f5888d648d7 in QEventLoop::exec (this=0x7fffe62ceb50, flags=...) at kernel/qeventloop.cpp:204
#40 0x00007f5888d697c5 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#41 0x00007f588c4f0783 in kdemain (argc=1, argv=0x7fffe62cee68) at /var/tmp/portage/kde-base/plasma-workspace-4.8.90/work/plasma-workspace-4.8.90/plasma/desktop/shell/main.cpp:120
#42 0x00007f588c12c66d in __libc_start_main (main=0x400800 <main(int, char**)>, argc=1, ubp_av=0x7fffe62cee68, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffe62cee58) at libc-start.c:226
#43 0x0000000000400831 in _start ()

Reported using DrKonqi