Index corruption

Hi,
   Something in my pg_proc table got corrupted and when trying to
vacuum it, vacuum would create thousands of index files in the database
directory. It would just go into an endless loop and all it seems to do
is create files. Anybody else seen this before? I've tried everything
and am now in the process of dumping all the data out table by table and
rebuilding the database from scratch. Any ideas what I can do to avoid
this or any idea how this could have happened? I'm running 6.5.2 on
Digital Unix 4.0F.

Cheers,

Adriaan