> > /usr/src/lib/libc/stdlib/malloc.c says NULL, which is suprising, given
quoted text
> > that OpenBSD will alert me to memory issues for programs that
> > run fine on another BSD.
> 
> All the options default to off, with the partial exception of the a/A
> option: the default behavior is not quite the same as either 'a' or
> 'A'.
> 
> (By default, it'll complain and abort if the internal structures get
> corrupted, you make a recursive call, or you pass it particularly
> bogus pointers.  'a' disables all those, while 'A' makes it also
> complain and die if allocation would fail.   It's probably those
> default checks that are triggering the alerts you referred to.)

MALLOC_OPTIONS has a bunch of additional things, above what malloc
does.

But obviously even when those are not used, malloc is imposing a bunch
of other paranoid features.