The protocol decode table in the server (GL/glx/indirect_table.c) has NULL in
the spot for glDeleteTextures.
Sorry about the phenomenal bug spam, guys. Adding xorg-team@ to the QA contact so bugs don't get lost in future.
Move to 7.3 tracker.
Ian Romanick fixed this a while ago in xserver commit a6df780e4d3f90cc699b0b864bade03d6f15afd7 .