After I re-emerged x11-libs/qt-core-4.8.4-r2, x11-libs/pixman-0.29.2 and
x11-libs/qt-gui-4.8.4-r1 due to the KDE 4.10.0 + QT 4.8.4 mess [1] a
crash occurred at an almost stable Gentoo during logout of the KDE
session - screen shot (nothing in /var/log/messages) + kernel config are
attached.

[1]
http://dilfridge.blogspot.de/2013/02/kde-4100-plasma-desktop-crashes-and-qt.html


-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3