Version:            (using KDE 4.2.2)
OS:                Linux
Installed from:    Debian testing/unstable Packages

before adding the separator I added "mark as read" button.

I've installed Qt 4.5.0-2 of esperimental

Backtrace:
Aplicación: KMail (kmail), señal SIGSEGV
0x00007f14593f08d1 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c
[Current thread is 0 (LWP 3515)]

Thread 2 (Thread 0x7f14409f3950 (LWP 11079)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007f145a8717d7 in QWaitCondition::wait (this=0x11d3be8, mutex=0x11d3be0, time=30000) at thread/qwaitcondition_unix.cpp:85
#2  0x00007f145a8672f9 in QThreadPoolThread::run (this=0x1d6d160) at concurrent/qthreadpool.cpp:140
#3  0x00007f145a870802 in QThreadPrivate::start (arg=0x1d6d160) at thread/qthread_unix.cpp:189
#4  0x00007f14549ebfaa in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f14594202bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f145c4b9750 (LWP 3515)):
[KCrash Handler]
#5  0x00007f145876ac19 in QDomNamedNodeMapPrivate::clone (this=0x1d766d0, p=0x270b6b0) at dom/qdom.cpp:3069
#6  0x00007f145876d533 in QDomElementPrivate (this=0x270b6b0, n=0x25e3640, deep=<value optimized out>) at dom/qdom.cpp:4424
#7  0x00007f145876d7f5 in QDomElementPrivate::cloneNode (this=0x25e3640, deep=false) at dom/qdom.cpp:4437
#8  0x00007f145876888e in QDomNodePrivate (this=0x270b290, n=<value optimized out>, deep=true) at dom/qdom.cpp:1485
#9  0x00007f145876d51c in QDomElementPrivate (this=0x31, n=0x1, deep=false) at dom/qdom.cpp:4422
#10 0x00007f145876d7f5 in QDomElementPrivate::cloneNode (this=0x1cce0c0, deep=false) at dom/qdom.cpp:4437
#11 0x00007f145876888e in QDomNodePrivate (this=0x270ba80, n=<value optimized out>, deep=true) at dom/qdom.cpp:1485
#12 0x00007f145876d51c in QDomElementPrivate (this=0x31, n=0x1, deep=false) at dom/qdom.cpp:4422
#13 0x00007f145876d7f5 in QDomElementPrivate::cloneNode (this=0x1ea0e70, deep=false) at dom/qdom.cpp:4437
#14 0x00007f145876888e in QDomNodePrivate (this=0x27109a0, n=<value optimized out>, deep=true) at dom/qdom.cpp:1485
#15 0x00007f145876d51c in QDomElementPrivate (this=0x31, n=0x1, deep=false) at dom/qdom.cpp:4422
#16 0x00007f145876d7f5 in QDomElementPrivate::cloneNode (this=0x1d7cd80, deep=false) at dom/qdom.cpp:4437
#17 0x00007f145876888e in QDomNodePrivate (this=0x2710660, n=<value optimized out>, deep=true) at dom/qdom.cpp:1485
#18 0x00007f145876d244 in QDomDocumentPrivate (this=0x31, n=0x1, deep=false) at dom/qdom.cpp:6185
#19 0x00007f145876d2e5 in QDomDocumentPrivate::cloneNode (this=0x1a3e560, deep=false) at dom/qdom.cpp:6260
#20 0x00007f14587669f5 in QDomNode::cloneNode (this=<value optimized out>, deep=true) at dom/qdom.cpp:2358
#21 0x00007f145c1144f3 in KXMLGUIFactory::removeClient (this=<value optimized out>, client=0x144c3c0) at ../../kdeui/xmlgui/kxmlguifactory.cpp:425
#22 0x00007f145c108568 in KXmlGuiWindow::createGUI (this=0x144c360, xmlfile=@0x7fff64603dd0) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:244
#23 0x00007f145b0bc6f3 in KMMainWin::slotUpdateToolbars (this=0x144c360) at ../../kmail/kmmainwin.cpp:150
#24 0x00007f145b0bd830 in KMMainWin::qt_metacall (this=0x144c360, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64603eb0) at ./kmmainwin.moc:76
#25 0x00007f145a96e622 in QMetaObject::activate (sender=0x7fff64605980, from_signal_index=<value optimized out>, to_signal_index=73, argv=0x270b720) at kernel/qobject.cpp:3069
#26 0x00007f145bf7e559 in KEditToolBar::qt_metacall (this=0x7fff64605980, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64603fb0) at ./kedittoolbar.moc:78
#27 0x00007f145a96e622 in QMetaObject::activate (sender=0x7fff64605980, from_signal_index=<value optimized out>, to_signal_index=43, argv=0x270b720) at kernel/qobject.cpp:3069
#28 0x00007f145bf72e35 in KDialog::slotButtonClicked (this=0x7fff64605980, button=8) at ../../kdeui/dialogs/kdialog.cpp:851
#29 0x00007f145bf7425d in KDialog::qt_metacall (this=0x7fff64605980, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64604180) at ./kdialog.moc:181
#30 0x00007f145bf7e4d5 in KEditToolBar::qt_metacall (this=0x31, _c=QMetaObject::ReadProperty, _id=39729152, _a=0x270b720) at ./kedittoolbar.moc:70
#31 0x00007f145a96e622 in QMetaObject::activate (sender=0x2629b48, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x270b720) at kernel/qobject.cpp:3069
#32 0x00007f145a97144e in QSignalMapper::mapped (this=0x31, _t1=8) at .moc/release-shared/moc_qsignalmapper.cpp:95
#33 0x00007f145a971cf0 in QSignalMapper::map (this=0x2629b48, sender=0x26316c0) at kernel/qsignalmapper.cpp:266
#34 0x00007f145a9728e0 in QSignalMapper::qt_metacall (this=0x2629b48, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64604300) at .moc/release-shared/moc_qsignalmapper.cpp:81
#35 0x00007f145a96e622 in QMetaObject::activate (sender=0x26316c0, from_signal_index=<value optimized out>, to_signal_index=30, argv=0x270b720) at kernel/qobject.cpp:3069
#36 0x00007f145a3e1d17 in QAbstractButton::clicked (this=0x31, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#37 0x00007f145a13fa9b in QAbstractButtonPrivate::emitClicked (this=0x262ea40) at widgets/qabstractbutton.cpp:543
#38 0x00007f145a1416f2 in QAbstractButtonPrivate::click (this=0x262ea40) at widgets/qabstractbutton.cpp:536
#39 0x00007f145a141945 in QAbstractButton::mouseReleaseEvent (this=0x26316c0, e=0x7fff64604c50) at widgets/qabstractbutton.cpp:1115
#40 0x00007f1459def7cf in QWidget::event (this=0x26316c0, event=0x7fff64604c50) at kernel/qwidget.cpp:7516
#41 0x00007f1459d9e67d in QApplicationPrivate::notify_helper (this=0x11d8b90, receiver=0x26316c0, e=0x7fff64604c50) at kernel/qapplication.cpp:4084
#42 0x00007f1459da6fca in QApplication::notify (this=<value optimized out>, receiver=0x26316c0, e=0x7fff64604c50) at kernel/qapplication.cpp:3786
#43 0x00007f145bffe55b in KApplication::notify (this=0x7fff64608b70, receiver=0x26316c0, event=0x7fff64604c50) at ../../kdeui/kernel/kapplication.cpp:307
#44 0x00007f145a958c4c in QCoreApplication::notifyInternal (this=0x7fff64608b70, receiver=0x26316c0, event=0x7fff64604c50) at kernel/qcoreapplication.cpp:602
#45 0x00007f1459da6218 in QApplicationPrivate::sendMouseEvent (receiver=0x26316c0, event=0x7fff64604c50, alienWidget=0x26316c0, nativeWidget=0x7fff64605980, buttonDown=<value optimized out>,
    lastMouseReceiver=@0x7f145a800eb0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#46 0x00007f1459e0fca9 in QETWidget::translateMouseEvent (this=0x7fff64605980, event=<value optimized out>) at kernel/qapplication_x11.cpp:4425
#47 0x00007f1459e0ede8 in QApplication::x11ProcessEvent (this=0x7fff64608b70, event=0x7fff646055e0) at kernel/qapplication_x11.cpp:3543
#48 0x00007f1459e36fa4 in x11EventSourceDispatch (s=0x11db960, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#49 0x00007f1451d46e4a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#50 0x00007f1451d4a510 in ?? () from /usr/lib/libglib-2.0.so.0
#51 0x00007f1451d4a6ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#52 0x00007f145a98229f in QEventDispatcherGlib::processEvents (this=0x11b6980, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#53 0x00007f1459e3674f in QGuiEventDispatcherGlib::processEvents (this=0x31, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#54 0x00007f145a9574f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1684035792}) at kernel/qeventloop.cpp:149
#55 0x00007f145a9578bd in QEventLoop::exec (this=0x7fff64605910, flags={i = 1684035888}) at kernel/qeventloop.cpp:200
#56 0x00007f145a25acee in QDialog::exec (this=0x7fff64605980) at dialogs/qdialog.cpp:498
#57 0x00007f145b0bc84a in KMMainWin::slotEditToolbars (this=0x144c360) at ../../kmail/kmmainwin.cpp:141
#58 0x00007f145b0bd840 in KMMainWin::qt_metacall (this=0x144c360, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff64605b10) at ./kmmainwin.moc:75
#59 0x00007f145a96e622 in QMetaObject::activate (sender=0x1a89800, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x270b720) at kernel/qobject.cpp:3069
#60 0x00007f1459d986e7 in QAction::triggered (this=0x31, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#61 0x00007f1459d99b60 in QAction::activate (this=0x1a89800, event=<value optimized out>) at kernel/qaction.cpp:1160
#62 0x00007f145a1c667c in QMenuPrivate::activateCausedStack (this=0x262a340, causedStack=@0x7fff64605c30, action=0x1a89800, action_e=QAction::Trigger, self=3) at widgets/qmenu.cpp:962
#63 0x00007f145a1cc64e in QMenuPrivate::activateAction (this=0x262a340, action=0x1a89800, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:1058
#64 0x00007f145c0ceda1 in KMenu::mouseReleaseEvent (this=0x26cd370, e=0x7fff64606750) at ../../kdeui/widgets/kmenu.cpp:454
#65 0x00007f1459def7cf in QWidget::event (this=0x26cd370, event=0x7fff64606750) at kernel/qwidget.cpp:7516
#66 0x00007f145a1cee0b in QMenu::event (this=0x26cd370, e=0x7fff64606750) at widgets/qmenu.cpp:2351
#67 0x00007f1459d9e67d in QApplicationPrivate::notify_helper (this=0x11d8b90, receiver=0x26cd370, e=0x7fff64606750) at kernel/qapplication.cpp:4084
#68 0x00007f1459da6fca in QApplication::notify (this=<value optimized out>, receiver=0x26cd370, e=0x7fff64606750) at kernel/qapplication.cpp:3786
#69 0x00007f145bffe55b in KApplication::notify (this=0x7fff64608b70, receiver=0x26cd370, event=0x7fff64606750) at ../../kdeui/kernel/kapplication.cpp:307
#70 0x00007f145a958c4c in QCoreApplication::notifyInternal (this=0x7fff64608b70, receiver=0x26cd370, event=0x7fff64606750) at kernel/qcoreapplication.cpp:602
#71 0x00007f1459da6218 in QApplicationPrivate::sendMouseEvent (receiver=0x26cd370, event=0x7fff64606750, alienWidget=0x0, nativeWidget=0x26cd370, buttonDown=<value optimized out>,
    lastMouseReceiver=@0x7f145a800eb0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#72 0x00007f1459e0fe64 in QETWidget::translateMouseEvent (this=0x26cd370, event=<value optimized out>) at kernel/qapplication_x11.cpp:4359
#73 0x00007f1459e0ede8 in QApplication::x11ProcessEvent (this=0x7fff64608b70, event=0x7fff646070e0) at kernel/qapplication_x11.cpp:3543
#74 0x00007f1459e36fa4 in x11EventSourceDispatch (s=0x11db960, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#75 0x00007f1451d46e4a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#76 0x00007f1451d4a510 in ?? () from /usr/lib/libglib-2.0.so.0
#77 0x00007f1451d4a6ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#78 0x00007f145a98229f in QEventDispatcherGlib::processEvents (this=0x11b6980, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#79 0x00007f1459e3674f in QGuiEventDispatcherGlib::processEvents (this=0x31, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#80 0x00007f145a9574f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1684042704}) at kernel/qeventloop.cpp:149
#81 0x00007f145a9578bd in QEventLoop::exec (this=0x7fff64607410, flags={i = 1684042800}) at kernel/qeventloop.cpp:200
#82 0x00007f145a1cec65 in QMenu::exec (this=<value optimized out>, p=@0x7fff64607cf0, action=0x0) at widgets/qmenu.cpp:1991
#83 0x00007f145c0ff4a0 in KToolBar::contextMenuEvent (this=0x1af6600, event=0x7fff64607cd0) at ../../kdeui/widgets/ktoolbar.cpp:722
#84 0x00007f1459defca4 in QWidget::event (this=0x1af6600, event=0x7fff64607cd0) at kernel/qwidget.cpp:7675
#85 0x00007f145a20bcdb in QToolBar::event (this=0x1af6600, event=0x7fff64607cd0) at widgets/qtoolbar.cpp:1182
#86 0x00007f1459d9e67d in QApplicationPrivate::notify_helper (this=0x11d8b90, receiver=0x1af6600, e=0x7fff64607cd0) at kernel/qapplication.cpp:4084
#87 0x00007f1459da6d0a in QApplication::notify (this=<value optimized out>, receiver=0x1af6600, e=0x7fff64607cd0) at kernel/qapplication.cpp:3873
#88 0x00007f145bffe55b in KApplication::notify (this=0x7fff64608b70, receiver=0x1af6600, event=0x7fff64607cd0) at ../../kdeui/kernel/kapplication.cpp:307
#89 0x00007f145a958c4c in QCoreApplication::notifyInternal (this=0x7fff64608b70, receiver=0x1af6600, event=0x7fff64607cd0) at kernel/qcoreapplication.cpp:602
#90 0x00007f1459e102eb in QETWidget::translateMouseEvent (this=0x144c360, event=<value optimized out>) at kernel/qapplication_x11.cpp:4431
#91 0x00007f1459e0ede8 in QApplication::x11ProcessEvent (this=0x7fff64608b70, event=0x7fff64608690) at kernel/qapplication_x11.cpp:3543
#92 0x00007f1459e36fa4 in x11EventSourceDispatch (s=0x11db960, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#93 0x00007f1451d46e4a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#94 0x00007f1451d4a510 in ?? () from /usr/lib/libglib-2.0.so.0
#95 0x00007f1451d4a6ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#96 0x00007f145a98229f in QEventDispatcherGlib::processEvents (this=0x11b6980, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#97 0x00007f1459e3674f in QGuiEventDispatcherGlib::processEvents (this=0x31, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#98 0x00007f145a9574f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1684048256}) at kernel/qeventloop.cpp:149
#99 0x00007f145a9578bd in QEventLoop::exec (this=0x7fff646089c0, flags={i = 1684048336}) at kernel/qeventloop.cpp:200
#100 0x00007f145a959b84 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#101 0x0000000000402f8b in main (argc=<value optimized out>, argv=<value optimized out>) at ../../kmail/main.cpp:146
Current language:  auto; currently asm
#0  0x00007f14593f08d1 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c