[uml-user] /proc/mm map failed errors - Swapping cows?

[Jonathan S. <sl...@tw...>]

I just wanted to ask what's probably a horribly silly question. I got
the following error after running stabilly for quite some time:=20

map : /proc/mm map failed, err =3D 12

it happened when i tried to use a COW file on my uml's swap space (so
that two instances could share the same swap file passed in as
ubd1=3D/path/to/swapfile.=20

Is it just a terrible idea to do this?=20