If I forget any essential information in this bug report, please see
http://bugs.gentoo.org/show_bug.cgi?id=85986 to check if I'd remembered to
mention it there.

Blender 2.36 segfaults reproducibly when I click on the "PANO" button (should be
visible in the lower right corner right after starting Blender), it also
segfaults in some other cases but I haven't happened to catch any of those other
crashes in gdb yet. Disabling hardware rendering or setting "TCL mode" to "TCL
stage in MESA pipeline" in driconf makes the crash disappear.

A bt full from after the crash and from a breakpoint at the beginning of
generic_interp will be attached. In t_vertex.c as possibly patched by Gentoo,
line 879 is where generic_interp starts and line 901 is the following one:

	 a[0].insert[4-1]( &a[0], vdst, pos );

Note the similarity to
http://www.mail-archive.com/dri-devel@lists.sourceforge.net/msg15889.html (one
of the few hits when googling for "generic_interp"). In case this crash doesn't
occur only on my system, perhaps the same kind of fix that worked for the savage
driver will work for r200, too?