Regression test core dumps

I am installing 6.4.2 on a new PII 350 with 128MB RAM, plenty of disk space
and Red Hat 5.2. I have been using 6.4.0 on a similar machine for a while
now. It seems to be failing when running the regression tests.

I seem to be getting a core dump. There are core files left in both
/usr/src/pgsql/src/test and /usr/src/pgsql/src/test/bench

The end of the output of 'gmake all runtest' looks like this:

---------------------------------------------
DEBUG: --Relation bprime--
DEBUG: Pages 25: Changed 25, Reapped 0, Empty 0, New 0; Tup 1000: Vac 0,...
gmake[1]: *** Deleting file `bench.out'
gmake: *** [runtest] Quit (core dumped)
Quit (core dumped)
----------------------------------------------

Has any body run into this before.
Bryan White
ArcaMax Inc.
Yorktown VA
www.arcamax.com