Application: kontact (4.8.0)
KDE Platform Version: 4.8.1 (4.8.1)
Qt Version: 4.8.0
Operating System: Linux 3.0.0-16-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
- Unusual behavior I noticed:

Already using 4.8 the "akonadi_mailfilter_agent" and "akonadi_nepomuk_feeder" started to run amok. That means,  they take 100% of CPU and memory consumption increases rapidly, leading to a swapping system. The same after upgrading to 4.8.1. It always happens after system boot and restarting Akonadi via "akonadictl restart".
In this case, I killed all those processes. After finding out, that I cannot sent mail without "akonadi_mailfilter_agent", i restarted Akonadi and killed all the "akonadi_nepomuk_feeder" processes (Nepomuk is disabled, btw, because of the wrong hope that this process does not make problems then). I tried to sent the mail trice, but it did not work as the "akonadi_mailfilter_agent" of course was running with 100% cpu and eating RAM. So I killed this and the following "akonadi_mailfilter_agent" processes. After that, I wanted to call up the 'Configure KMail' dialog via menubar, then Kontact crashed.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fe2954217c0 (LWP 2772))]

Thread 4 (Thread 0x7fe279f1f700 (LWP 2777)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fe291c58c2c in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007fe291c58d59 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007fe28d425efc in start_thread (arg=0x7fe279f1f700) at pthread_create.c:304
#4  0x00007fe29296859d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fe27971e700 (LWP 2778)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007fe27971db30 in ?? ()
#2  0x00007fff85bff7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 2 (Thread 0x7fe22f31d700 (LWP 2908)):
#0  0x00007fe29295c473 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe28cf53f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe28cf54429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2930d6c06 in QEventDispatcherGlib::processEvents (this=0x27a41a0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fe2930a63e2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fe2930a6637 in QEventLoop::exec (this=0x7fe22f31cd90, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fe292fa6067 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007fe29308617f in QInotifyFileSystemWatcherEngine::run (this=0x2917630) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fe292fa908b in QThreadPrivate::start (arg=0x2917630) at thread/qthread_unix.cpp:298
#9  0x00007fe28d425efc in start_thread (arg=0x7fe22f31d700) at pthread_create.c:304
#10 0x00007fe29296859d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fe2954217c0 (LWP 2772)):
[KCrash Handler]
#6  0x00007fe29357f12d in KServiceGroup::childGroup (parent=...) at ../../kdecore/services/kservicegroup.cpp:727
#7  0x00007fe2906a0be9 in KSettings::DialogPrivate::instanceServices (this=0x6771f70) at ../../kutils/ksettings/dialog.cpp:145
#8  0x00007fe2906a1a2e in KSettings::Dialog::showEvent (this=0x3995a70) at ../../kutils/ksettings/dialog.cpp:123
#9  0x00007fe293aebbc5 in QWidget::event (this=0x3995a70, event=0x7fff85bf2a10) at kernel/qwidget.cpp:8568
#10 0x00007fe293a9b104 in notify_helper (e=0x7fff85bf2a10, receiver=0x3995a70, this=0x22988d0) at kernel/qapplication.cpp:4555
#11 QApplicationPrivate::notify_helper (this=0x22988d0, receiver=0x3995a70, e=0x7fff85bf2a10) at kernel/qapplication.cpp:4527
#12 0x00007fe293a9ff83 in QApplication::notify (this=0x7fff85bf4620, receiver=0x3995a70, e=0x7fff85bf2a10) at kernel/qapplication.cpp:4416
#13 0x00007fe2947cd9a6 in KApplication::notify (this=0x7fff85bf4620, receiver=0x3995a70, event=0x7fff85bf2a10) at ../../kdeui/kernel/kapplication.cpp:311
#14 0x00007fe2930a75fc in QCoreApplication::notifyInternal (this=0x7fff85bf4620, receiver=0x3995a70, event=0x7fff85bf2a10) at kernel/qcoreapplication.cpp:876
#15 0x00007fe293aedfe0 in sendEvent (event=0x7fff85bf2a10, receiver=0x3995a70) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#16 QWidgetPrivate::show_helper (this=0x460c710) at kernel/qwidget.cpp:7541
#17 0x00007fe293aee2d2 in QWidget::setVisible (this=0x3995a70, visible=<optimized out>) at kernel/qwidget.cpp:7763
#18 0x00007fe293f6a0bc in QDialog::setVisible (this=0x3995a70, visible=<optimized out>) at dialogs/qdialog.cpp:739
#19 0x00007fe295046774 in show (this=<optimized out>) at /usr/include/qt4/QtGui/qwidget.h:487
#20 Kontact::MainWindow::slotPreferences (this=0x2461120) at ../../../kontact/src/mainwindow.cpp:1041
#21 0x00007fe295049ce6 in Kontact::MainWindow::qt_metacall (this=0x2461120, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff85bf2d50) at ./mainwindow.moc:122
#22 0x00007fe2930bbbe9 in QMetaObject::activate (sender=0x255e7a0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff85bf2d50) at kernel/qobject.cpp:3566
#23 0x00007fe293a94c52 in QAction::triggered (this=<optimized out>, _t1=false) at .moc/release-shared/moc_qaction.cpp:277
#24 0x00007fe293a94e3f in QAction::activate (this=0x255e7a0, event=<optimized out>) at kernel/qaction.cpp:1257
#25 0x00007fe293ee4519 in QMenuPrivate::activateCausedStack (this=0x2575490, causedStack=..., action=0x255e7a0, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:1028
#26 0x00007fe293eea622 in QMenuPrivate::activateAction (this=0x2575490, action=0x255e7a0, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:1120
#27 0x00007fe29488f180 in KMenu::mouseReleaseEvent (this=0x26c9660, e=0x7fff85bf3920) at ../../kdeui/widgets/kmenu.cpp:464
#28 0x00007fe293aeb914 in QWidget::event (this=0x26c9660, event=0x7fff85bf3920) at kernel/qwidget.cpp:8361
#29 0x00007fe293eebbbb in QMenu::event (this=0x26c9660, e=0x7fff85bf3920) at widgets/qmenu.cpp:2460
#30 0x00007fe293a9b104 in notify_helper (e=0x7fff85bf3920, receiver=0x26c9660, this=0x22988d0) at kernel/qapplication.cpp:4555
#31 QApplicationPrivate::notify_helper (this=0x22988d0, receiver=0x26c9660, e=0x7fff85bf3920) at kernel/qapplication.cpp:4527
#32 0x00007fe293aa092f in QApplication::notify (this=<optimized out>, receiver=0x26c9660, e=0x7fff85bf3920) at kernel/qapplication.cpp:4098
#33 0x00007fe2947cd9a6 in KApplication::notify (this=0x7fff85bf4620, receiver=0x26c9660, event=0x7fff85bf3920) at ../../kdeui/kernel/kapplication.cpp:311
#34 0x00007fe2930a75fc in QCoreApplication::notifyInternal (this=0x7fff85bf4620, receiver=0x26c9660, event=0x7fff85bf3920) at kernel/qcoreapplication.cpp:876
#35 0x00007fe293a9c0d2 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#36 QApplicationPrivate::sendMouseEvent (receiver=0x26c9660, event=0x7fff85bf3920, alienWidget=0x0, nativeWidget=0x26c9660, buttonDown=0x0, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3166
#37 0x00007fe293b18e11 in QETWidget::translateMouseEvent (this=0x26c9660, event=<optimized out>) at kernel/qapplication_x11.cpp:4547
#38 0x00007fe293b1762a in QApplication::x11ProcessEvent (this=0x7fff85bf4620, event=0x7fff85bf41e0) at kernel/qapplication_x11.cpp:3732
#39 0x00007fe293b40592 in x11EventSourceDispatch (s=0x22a1800, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#40 0x00007fe28cf53a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007fe28cf54258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007fe28cf54429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007fe2930d6b9f in QEventDispatcherGlib::processEvents (this=0x225dc10, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#44 0x00007fe293b4021e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#45 0x00007fe2930a63e2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#46 0x00007fe2930a6637 in QEventLoop::exec (this=0x7fff85bf45b0, flags=...) at kernel/qeventloop.cpp:204
#47 0x00007fe2930ab6c7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#48 0x0000000000403629 in main (argc=3, argv=0x7fff85bf4c48) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi