Andrew Morton wrote:
> With these six patches the ppc64 is hitting the BUG in exit_mmap():
> 
>         BUG_ON(mm->nr_ptes);    /* This is just debugging */
> 
> fairly early in boot.
> 

No doubt Hugh will have this fixed before long... but if you
have time to spare, you may just try hitting it on the head
and making it a bit dumber. It might help show where the problem
is.

- don't span multiple vmas
- don't be so smart about avoiding unfreeable regions

I dunno. Maybe it won't help at all. Maybe it will make things
worse :P