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:

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

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