Version:            (using KDE 4.2.2)
Installed from:    Gentoo Packages

I have reopen because I can allways reproduct it:
Application: KMail (kmail), signal SIGABRT
0x00007f616e0088a0 in __nanosleep_nocancel () from /lib/libc.so.6
Current language:  auto; currently c

Thread 1 (Thread 0x7f61745d7750 (LWP 15941)):
[KCrash Handler]
#5  0x00007f616df9b1e5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x00007f616df9c703 in *__GI_abort () at abort.c:88
#7  0x00007f616fd88375 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2006
#8  0x00007f616fd88490 in qFatal (msg=<value optimized out>) at global/qglobal.cpp:2201
#9  0x00007f6173440d04 in KMail::MessageListView::Core::Model::viewItemJobStep (this=0x272bfc0) at /var/tmp/portage/kde-base/kmail-4.2.2/work/kmail-4.2.2/kmail/messagelistview/core/model.cpp:3853
#10 0x00007f6172fe5138 in KMail::MessageListView::Core::Model::qt_metacall (this=0x272bfc0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff7c626800)
    at /var/tmp/portage/kde-base/kmail-4.2.2/work/kmail_build/kmail/moc_model.cpp:76
#11 0x00007f616fe8501d in QMetaObject::activate (sender=0x2770f30, from_signal_index=<value optimized out>, to_signal_index=4, argv=0xffffffffffffffff) at kernel/qobject.cpp:3057
#12 0x00007f616fe7f993 in QObject::event (this=0x2770f30, e=0x3e45) at kernel/qobject.cpp:1073
#13 0x00007f616ec0a90d in QApplicationPrivate::notify_helper (this=0x24bdd20, receiver=0x2770f30, e=0x7fff7c626eb0) at kernel/qapplication.cpp:4084
#14 0x00007f616ec133be in QApplication::notify (this=0x7fff7c627310, receiver=0x2770f30, e=0x7fff7c626eb0) at kernel/qapplication.cpp:4049
#15 0x00007f6173ff040b in KApplication::notify (this=0x7fff7c627310, receiver=0x2770f30, event=0x7fff7c626eb0)
    at /var/tmp/portage/kde-base/kdelibs-4.2.2-r1/work/kdelibs-4.2.2/kdeui/kernel/kapplication.cpp:307
#16 0x00007f616fe6f9f3 in QCoreApplication::notifyInternal (this=0x7fff7c627310, receiver=0x2770f30, event=0x7fff7c626eb0) at kernel/qcoreapplication.cpp:598
#17 0x00007f616fe9a19e in QTimerInfoList::activateTimers (this=0x24c0c70) at kernel/qcoreapplication.h:213
#18 0x00007f616fe975cd in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:164
#19 0x00007f61670d1232 in IA__g_main_context_dispatch (context=0x24c0040) at gmain.c:2144
#20 0x00007f61670d494d in g_main_context_iterate (context=0x24c0040, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2778
#21 0x00007f61670d4b0b in IA__g_main_context_iteration (context=0x24c0040, may_block=1) at gmain.c:2841
#22 0x00007f616fe9753f in QEventDispatcherGlib::processEvents (this=0x24bc930, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#23 0x00007f616ec9775f in QGuiEventDispatcherGlib::processEvents (this=0x3e45, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#24 0x00007f616fe6e692 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 2086826272}) at kernel/qeventloop.cpp:149
#25 0x00007f616fe6e825 in QEventLoop::exec (this=0x7fff7c627160, flags={i = 2086826352}) at kernel/qeventloop.cpp:196
#26 0x00007f616fe733e6 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#27 0x000000000040332b in main (argc=<value optimized out>, argv=<value optimized out>) at /var/tmp/portage/kde-base/kmail-4.2.2/work/kmail-4.2.2/kmail/main.cpp:146