I'm trying to work out why GraphicsMagick is giving me things like

   gm in free(): error: chunk is already free.

and

   gm in free(): error: freelist is destroyed.

(also had a pthread warning) Anyway, I have

% echo $MALLOC_OPTIONS
A
% ls -l /etc/malloc.conf
lrwxr-xr-x  1 root  wheel  1 Jun 24 18:00 /etc/malloc.conf -> A
%

Yet I can't generate a coredump. Any idea what I have missed?

Cheers,

Patrick