Xorg crashes with SNA enabled

[JS987]

you can submit bug report at

https://bugs.freedesktop.org/enter_bug.cgi?product=xorg

Component: driver/Intel

[masa]

My X crashes every time I try to open the module editor from the Kicad suite's pcbnew layout editor.
I have narrowed the problem down to SNA. I recompiled the xf86-video-intel driver with both SNA and UXA support (I'm on Funtoo, so USE flags sna and uxa enabled).
When I change the AccelMethod to "SNA" in my /etc/X11/xorg.conf.d/40-monitor.conf, my X crashes immediately when I try to launch the module editor.
When I change the AccelMethod to "UXA", the module editor launches correctly. So I'm forced to use UXA for now, if I want to use Kicad.

I have Intel Core-i5 3570K (Ivy Bridge) CPU and I'm using the integrated HD graphics. (Asus P8Z77-V LE motherboard)
kernel: 3.6.1-gentoo
xorg-server: 1.12.4
libdrm: from git ebuild this morning
xf86-video-intel: from git ebuild from an hour ago
(mesa: from git ebuild)

I'm using these commands to compile Kicad version 2011-07-08 from sources

unzip kicad_sources-2011-07-08-BZR3044.zip
cd kicad_sources-2011-07-08_BZR3044
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local -DKICAD_KEEPCASE=ON -DKICAD_MINIZIP=OFF -DCMAKE_CXX_FLAGS=-m64 -DKICAD_STABLE_VERSION=ON ../
make
sudo make install

The same crash also happens with Kicad version 20120119_p3256 from portage tree.
(Kicad downloads can be found here: http://iut-tice.ujf-grenoble.fr/cao/ )

Xorg.0.log.old with some backtrace info:

http://pastebin.com/K1da4bn4

emerge --info output:

http://pastebin.com/T6J3GTTN

Am I doing something wrong, or is there a somewhat fatal bug in the xf86-video-intel driver when using SNA?
If you need more information, just ask and maybe explain how I should get that, I'm not an expert on these things.

-matti