Somethings is *really* wrong here. I don't know exactly what's happening
here, but I assume that the memalign function is buggy. To nail that
further down:

1) Determine the used memalign function:

$ grep memalign lib/Parrot/Config.pm
             'memalign' => 'memalign',

It could be 'posix_memalign' too.

2) Copy either config/auto/memalign/ test_c.in or test_c2.in somewhere
   as e.g. align.c

3) Replace
#include <${malloc_header}>
with     <malloc.h>
or whatever is the correct header file. see e.g. "man memalign"

4) compile and run it:
$ cc -Wall -g align.c -o align && ./align
ok

5) Now the easy part: Vary the alignment of the function and the test,
if actually the lo bits are zero.

BTW Kind of this "stress" test is very welcome for the config system.

Google around, if you can find signs of a broken memalign function on
your system.