As the heading says. I've tracked down which file is growing to fill the filesystem, it's /proc/kcore. Here's a snippet of 'ls /proc'
{ -rw------- 1 root root 140737471590400 Nov 9 02:54 kcore }
I tried 'tail /proc/kcore' but it's obviously a binary file and wouldn't stop until I killed it. Even logged in as root, it wouldn't let me delete it. Heeelp! Peter