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0e1f616
(Get the code!)
As promised I attached the information I was asked for.
Even though I am quite sure that it wont help much, as the interesting thing about Xorg is the Segmentation Fault with back trace.
As far as I can see/guess, there is some caching going on for glyphs when font antialiasing is enabled. However, some applications (kmail is easiest, maybe due to the fact that it hides windows?) seems to trigger a glyph lookup which tries to fetch from an invalid / forbidden memory section. This is why it's a bit hard for me to tell which package really causes this, but my best guess is Xorg and the video driver. I know that this is a bug which might be hard to reproduce, but unfortunately I can't do much more.
As said, this only happens with font antialiasing enabled, and only with some fonts (default binding for serif/sans serif, which should be dejavu). Easiest way to trigger: (might be better to do this in gnome) go to systemsettings, font settings, revert all settings to standard, apply, start kmail, reply to a mail. Xorg should crash. At least it does that here, 100% reproducible.
Kind regards,
Christian