At a very quick glance, it looks like the ChangeLog entry:
2002-08-22 Steven Munroe <sjmunroe@us.ibm.com>
* sysdeps/powerpc/memset.S: Define __cache_line_size and use its
value to select the correct stride for dcbz.
might solve this bug. Can you confirm whether it does or not?
Tks,
Jeff Bailey