Quoting Blair Sadewitz <blair.sadewitz@gmail.com>:

> I enabled UFS_DIRHASH on a hunch it would help LFS (wow, what a
> difference for pkgsrc builds).
>
> I have not seen any crashes yet, but I don't think it's been long
> enough to tell.

The crashes that Thor saw were on heavily loaded multiprocessor(?)  
systems. I had been using UFS_DIRHASH on my machines for at least a  
year and a half without seeing any problems. Let's just say that,  
without somebody familiar in that area proclaiming pool(9)'s safe  
usage in that code, I would not recommend that people start using it  
again if they're concerned with absolute stability.

Steve