The gdm :0.log filled up my entire root partition. Incredibly, Linux continued to run!

Examined the log and noticed several thousand (million?) occurrences of the following message sequence:

Code:
Mesa 7.6 implementation error: bad datatype in interpolate_int_colors
Please report at bugzilla.freedesktop.org
Mesa 7.6 implementation error: Invalid datatype in _mesa_convert_colors
Please report at bugzilla.freedesktop.org
I suspect that something may be wrong with Mesa 7.6.

I'm running OpenSuSE 11.2, 2.6.31.14-0.6, with xfce 4.6.1. /usr/sbin/gdm is dated 2010-09-15 17:12.