valloc() is a variant of malloc() intended to return page-aligned
memory areas.  It is relied on by certain programs for mmap() alignment
or for raw IO, in which cases the kernel enforces page alignment on the
user's buffers.

RH6.1 valloc() correctly aligns its return addresses.  This is no longer
true in RH6.2 beta, and code may break because of this.  In particular,
lmdd running on raw devices is now broken in 6.2 due to this problem.

I'll attach a trivial test program demonstrating the bug.