Is the number of users (/etc/passwd) on the trusted system "huge"? There are known crashers on HP-UX and Windows (and probably more) for systems that host a rather high number of users. It is not depending on how many users are currently logged in, but on the number of user id's the system knows about.
I /think/ it is fixed in more recent versions of perl, but I never had access to a trusted HP-UX with a high number of known users.
More recent ports for perl are available on HP's site (5.8.8), the HP porting center (5.10.1) or on my site (all up to and including 5.16.0).
Enjoy, Have FUN! H.Merijn