Quoting Jukka Marin,

> I think this problem is real, considering the number of people who have
> reported it.

It certainly is real. It's an old problem in the VM code. If I remember
correctly, it has to do with VM objects not being cleaned up when having
a pager associated with them, and it occurs in situations where a
child process exits while pages in the parent have been paged out.

This is all from memory, so the details may be different.

- Frank